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Fix: event notifier: racy use of last subbuffer record
[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>
c570be0d 37#include <wrapper/compiler_attributes.h>
241ae9a8
MD		 38#include <wrapper/poll.h>
39#include <wrapper/file.h>
40#include <wrapper/kref.h>
6657edec 41#include <wrapper/barrier.h>
2df37e95
MD		 42#include <lttng/string-utils.h>
43#include <lttng/abi.h>
44#include <lttng/abi-old.h>
45#include <lttng/events.h>
92bc1e23 46#include <lttng/events-internal.h>
2df37e95
MD		 47#include <lttng/tracer.h>
48#include <lttng/tp-mempool.h>
24591303 49#include <ringbuffer/frontend_types.h>
db2511b4 50#include <ringbuffer/iterator.h>
baf20995
MD		 51
52/*
53 * This is LTTng's own personal way to create a system call as an external
80996790 54 * module. We use ioctl() on /proc/lttng.
baf20995
MD		 55 */
56
e6a17f26 57static struct proc_dir_entry *lttng_proc_dentry;
059de147 58
5f4c791e 59#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
059de147
MJ		 60static const struct proc_ops lttng_proc_ops;
61#else
62static const struct file_operations lttng_proc_ops;
63#endif
64
ad1c05e1 65static const struct file_operations lttng_session_fops;
750b05f2 66static const struct file_operations lttng_event_notifier_group_fops;
ad1c05e1 67static const struct file_operations lttng_channel_fops;
5dbbdb43 68static const struct file_operations lttng_metadata_fops;
ef784b4d
MD		 69static const struct file_operations lttng_event_recorder_event_fops;
70static const struct file_operations lttng_event_recorder_enabler_fops;
ed8d02d6 71static struct file_operations lttng_stream_ring_buffer_file_operations;
baf20995 72
9616f0bf 73static int put_u64(uint64_t val, unsigned long arg);
8b97fd42 74static int put_u32(uint32_t val, unsigned long arg);
9616f0bf 75
99f52fcc
FD		 76static int validate_zeroed_padding(char *p, size_t len)
77{
78 size_t i;
79
80 for (i = 0; i < len; i++) {
81 if (p[i])
82 return -1;
83 }
84 return 0;
85}
86
a33c9927
MD		 87/*
88 * Teardown management: opened file descriptors keep a refcount on the module,
89 * so it can only exit when all file descriptors are closed.
90 */
91
ad1c05e1 92static
baf20995
MD		 93int lttng_abi_create_session(void)
94{
a40e3229 95 struct lttng_kernel_session *session;
c0e31d2e 96 struct file *session_file;
11b5a3c2 97 int session_fd, ret;
baf20995 98
a90917c3 99 session = lttng_session_create();
baf20995
MD		 100 if (!session)
101 return -ENOMEM;
4ac10b76 102 session_fd = lttng_get_unused_fd();
baf20995
MD		 103 if (session_fd < 0) {
104 ret = session_fd;
105 goto fd_error;
106 }
c0e31d2e 107 session_file = anon_inode_getfile("[lttng_session]",
ad1c05e1 108 &lttng_session_fops,
baf20995 109 session, O_RDWR);
c0e31d2e
MD		 110 if (IS_ERR(session_file)) {
111 ret = PTR_ERR(session_file);
baf20995
MD		 112 goto file_error;
113 }
a40e3229 114 session->priv->file = session_file;
c0e31d2e 115 fd_install(session_fd, session_file);
baf20995
MD		 116 return session_fd;
117
118file_error:
119 put_unused_fd(session_fd);
120fd_error:
a90917c3 121 lttng_session_destroy(session);
baf20995
MD		 122 return ret;
123}
124
21f58fb7
FD		 125void event_notifier_send_notification_work_wakeup(struct irq_work *entry)
126{
127 struct lttng_event_notifier_group *event_notifier_group =
128 container_of(entry, struct lttng_event_notifier_group,
129 wakeup_pending);
130 wake_up_interruptible(&event_notifier_group->read_wait);
131}
132
750b05f2
FD		 133static
134int lttng_abi_create_event_notifier_group(void)
135{
136 struct lttng_event_notifier_group *event_notifier_group;
137 struct file *event_notifier_group_file;
138 int event_notifier_group_fd, ret;
139
140 event_notifier_group = lttng_event_notifier_group_create();
141 if (!event_notifier_group)
142 return -ENOMEM;
143
144 event_notifier_group_fd = lttng_get_unused_fd();
145 if (event_notifier_group_fd < 0) {
146 ret = event_notifier_group_fd;
147 goto fd_error;
148 }
149 event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]",
150 &lttng_event_notifier_group_fops,
151 event_notifier_group, O_RDWR);
152 if (IS_ERR(event_notifier_group_file)) {
153 ret = PTR_ERR(event_notifier_group_file);
154 goto file_error;
155 }
156
157 event_notifier_group->file = event_notifier_group_file;
21f58fb7
FD		 158 init_waitqueue_head(&event_notifier_group->read_wait);
159 init_irq_work(&event_notifier_group->wakeup_pending,
160 event_notifier_send_notification_work_wakeup);
750b05f2
FD		 161 fd_install(event_notifier_group_fd, event_notifier_group_file);
162 return event_notifier_group_fd;
163
164file_error:
165 put_unused_fd(event_notifier_group_fd);
166fd_error:
167 lttng_event_notifier_group_destroy(event_notifier_group);
168 return ret;
169}
170
271b6681
MD		 171static
172int lttng_abi_tracepoint_list(void)
173{
174 struct file *tracepoint_list_file;
175 int file_fd, ret;
176
4ac10b76 177 file_fd = lttng_get_unused_fd();
271b6681
MD		 178 if (file_fd < 0) {
179 ret = file_fd;
180 goto fd_error;
181 }
30f18bf0 182
8ee099b6 183 tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]",
271b6681
MD		 184 &lttng_tracepoint_list_fops,
185 NULL, O_RDWR);
186 if (IS_ERR(tracepoint_list_file)) {
187 ret = PTR_ERR(tracepoint_list_file);
188 goto file_error;
189 }
30f18bf0
MD		 190 ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file);
191 if (ret < 0)
192 goto open_error;
271b6681
MD		 193 fd_install(file_fd, tracepoint_list_file);
194 return file_fd;
195
30f18bf0
MD		 196open_error:
197 fput(tracepoint_list_file);
271b6681
MD		 198file_error:
199 put_unused_fd(file_fd);
200fd_error:
201 return ret;
202}
203
f127e61e
MD		 204#ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
205static inline
206int lttng_abi_syscall_list(void)
207{
208 return -ENOSYS;
209}
210#else
211static
212int lttng_abi_syscall_list(void)
213{
214 struct file *syscall_list_file;
215 int file_fd, ret;
216
217 file_fd = lttng_get_unused_fd();
218 if (file_fd < 0) {
219 ret = file_fd;
220 goto fd_error;
221 }
222
223 syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
224 &lttng_syscall_list_fops,
225 NULL, O_RDWR);
226 if (IS_ERR(syscall_list_file)) {
227 ret = PTR_ERR(syscall_list_file);
228 goto file_error;
229 }
230 ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
231 if (ret < 0)
232 goto open_error;
233 fd_install(file_fd, syscall_list_file);
f127e61e
MD		 234 return file_fd;
235
236open_error:
237 fput(syscall_list_file);
238file_error:
239 put_unused_fd(file_fd);
240fd_error:
241 return ret;
242}
243#endif
244
80c16bcf 245static
606828e4 246void lttng_abi_tracer_version(struct lttng_kernel_abi_tracer_version *v)
80c16bcf 247{
6dccd6c1
JD		 248 v->major = LTTNG_MODULES_MAJOR_VERSION;
249 v->minor = LTTNG_MODULES_MINOR_VERSION;
250 v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
80c16bcf
MD		 251}
252
42cabb80 253static
606828e4 254void lttng_abi_tracer_abi_version(struct lttng_kernel_abi_tracer_abi_version *v)
42cabb80 255{
606828e4
MD		 256 v->major = LTTNG_KERNEL_ABI_MAJOR_VERSION;
257 v->minor = LTTNG_KERNEL_ABI_MINOR_VERSION;
42cabb80
MD		 258}
259
8070f5c0
MD		 260static
261long lttng_abi_add_context(struct file *file,
606828e4 262 struct lttng_kernel_abi_context *context_param,
a40e3229 263 struct lttng_kernel_ctx **ctx, struct lttng_kernel_session *session)
8070f5c0 264{
8070f5c0 265
a40e3229 266 if (session->priv->been_active)
8070f5c0
MD		 267 return -EPERM;
268
6dccd6c1 269 switch (context_param->ctx) {
606828e4 270 case LTTNG_KERNEL_ABI_CONTEXT_PID:
8070f5c0 271 return lttng_add_pid_to_ctx(ctx);
606828e4 272 case LTTNG_KERNEL_ABI_CONTEXT_PRIO:
a8ad3613 273 return lttng_add_prio_to_ctx(ctx);
606828e4 274 case LTTNG_KERNEL_ABI_CONTEXT_NICE:
53f1f0ca 275 return lttng_add_nice_to_ctx(ctx);
606828e4 276 case LTTNG_KERNEL_ABI_CONTEXT_VPID:
b64bc438 277 return lttng_add_vpid_to_ctx(ctx);
606828e4 278 case LTTNG_KERNEL_ABI_CONTEXT_TID:
b64bc438 279 return lttng_add_tid_to_ctx(ctx);
606828e4 280 case LTTNG_KERNEL_ABI_CONTEXT_VTID:
b64bc438 281 return lttng_add_vtid_to_ctx(ctx);
606828e4 282 case LTTNG_KERNEL_ABI_CONTEXT_PPID:
b64bc438 283 return lttng_add_ppid_to_ctx(ctx);
606828e4 284 case LTTNG_KERNEL_ABI_CONTEXT_VPPID:
b64bc438 285 return lttng_add_vppid_to_ctx(ctx);
606828e4
MD		 286 case LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER:
287 context_param->u.perf_counter.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
6dccd6c1
JD		 288 return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type,
289 context_param->u.perf_counter.config,
290 context_param->u.perf_counter.name,
c24a0d71 291 ctx);
606828e4 292 case LTTNG_KERNEL_ABI_CONTEXT_PROCNAME:
a2563e83 293 return lttng_add_procname_to_ctx(ctx);
606828e4 294 case LTTNG_KERNEL_ABI_CONTEXT_HOSTNAME:
975da2c0 295 return lttng_add_hostname_to_ctx(ctx);
606828e4 296 case LTTNG_KERNEL_ABI_CONTEXT_CPU_ID:
b3699d90 297 return lttng_add_cpu_id_to_ctx(ctx);
606828e4 298 case LTTNG_KERNEL_ABI_CONTEXT_INTERRUPTIBLE:
79150a49 299 return lttng_add_interruptible_to_ctx(ctx);
606828e4 300 case LTTNG_KERNEL_ABI_CONTEXT_NEED_RESCHEDULE:
79150a49 301 return lttng_add_need_reschedule_to_ctx(ctx);
606828e4 302 case LTTNG_KERNEL_ABI_CONTEXT_PREEMPTIBLE:
79150a49 303 return lttng_add_preemptible_to_ctx(ctx);
606828e4 304 case LTTNG_KERNEL_ABI_CONTEXT_MIGRATABLE:
79150a49 305 return lttng_add_migratable_to_ctx(ctx);
606828e4
MD		 306 case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_KERNEL:
307 case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_USER:
2fa2d39a 308 return lttng_add_callstack_to_ctx(ctx, context_param->ctx);
606828e4 309 case LTTNG_KERNEL_ABI_CONTEXT_CGROUP_NS:
a6cf40a4 310 return lttng_add_cgroup_ns_to_ctx(ctx);
606828e4 311 case LTTNG_KERNEL_ABI_CONTEXT_IPC_NS:
a6cf40a4 312 return lttng_add_ipc_ns_to_ctx(ctx);
606828e4 313 case LTTNG_KERNEL_ABI_CONTEXT_MNT_NS:
a6cf40a4 314 return lttng_add_mnt_ns_to_ctx(ctx);
606828e4 315 case LTTNG_KERNEL_ABI_CONTEXT_NET_NS:
a6cf40a4 316 return lttng_add_net_ns_to_ctx(ctx);
606828e4 317 case LTTNG_KERNEL_ABI_CONTEXT_PID_NS:
a6cf40a4 318 return lttng_add_pid_ns_to_ctx(ctx);
606828e4 319 case LTTNG_KERNEL_ABI_CONTEXT_USER_NS:
a6cf40a4 320 return lttng_add_user_ns_to_ctx(ctx);
606828e4 321 case LTTNG_KERNEL_ABI_CONTEXT_UTS_NS:
a6cf40a4 322 return lttng_add_uts_ns_to_ctx(ctx);
606828e4 323 case LTTNG_KERNEL_ABI_CONTEXT_UID:
dc923e75 324 return lttng_add_uid_to_ctx(ctx);
606828e4 325 case LTTNG_KERNEL_ABI_CONTEXT_EUID:
dc923e75 326 return lttng_add_euid_to_ctx(ctx);
606828e4 327 case LTTNG_KERNEL_ABI_CONTEXT_SUID:
dc923e75 328 return lttng_add_suid_to_ctx(ctx);
606828e4 329 case LTTNG_KERNEL_ABI_CONTEXT_GID:
dc923e75 330 return lttng_add_gid_to_ctx(ctx);
606828e4 331 case LTTNG_KERNEL_ABI_CONTEXT_EGID:
dc923e75 332 return lttng_add_egid_to_ctx(ctx);
606828e4 333 case LTTNG_KERNEL_ABI_CONTEXT_SGID:
dc923e75 334 return lttng_add_sgid_to_ctx(ctx);
606828e4 335 case LTTNG_KERNEL_ABI_CONTEXT_VUID:
dc923e75 336 return lttng_add_vuid_to_ctx(ctx);
606828e4 337 case LTTNG_KERNEL_ABI_CONTEXT_VEUID:
dc923e75 338 return lttng_add_veuid_to_ctx(ctx);
606828e4 339 case LTTNG_KERNEL_ABI_CONTEXT_VSUID:
dc923e75 340 return lttng_add_vsuid_to_ctx(ctx);
606828e4 341 case LTTNG_KERNEL_ABI_CONTEXT_VGID:
dc923e75 342 return lttng_add_vgid_to_ctx(ctx);
606828e4 343 case LTTNG_KERNEL_ABI_CONTEXT_VEGID:
dc923e75 344 return lttng_add_vegid_to_ctx(ctx);
606828e4 345 case LTTNG_KERNEL_ABI_CONTEXT_VSGID:
dc923e75 346 return lttng_add_vsgid_to_ctx(ctx);
606828e4 347 case LTTNG_KERNEL_ABI_CONTEXT_TIME_NS:
876e2e92 348 return lttng_add_time_ns_to_ctx(ctx);
8070f5c0
MD		 349 default:
350 return -EINVAL;
351 }
352}
353
ad1c05e1
MD		 354/**
355 * lttng_ioctl - lttng syscall through ioctl
356 *
c0e31d2e 357 * @file: the file
ad1c05e1
MD		 358 * @cmd: the command
359 * @arg: command arg
360 *
361 * This ioctl implements lttng commands:
606828e4 362 * LTTNG_KERNEL_ABI_SESSION
ad1c05e1 363 * Returns a LTTng trace session file descriptor
606828e4 364 * LTTNG_KERNEL_ABI_TRACER_VERSION
271b6681 365 * Returns the LTTng kernel tracer version
606828e4 366 * LTTNG_KERNEL_ABI_TRACEPOINT_LIST
271b6681 367 * Returns a file descriptor listing available tracepoints
606828e4 368 * LTTNG_KERNEL_ABI_WAIT_QUIESCENT
360f38ea 369 * Returns after all previously running probes have completed
606828e4 370 * LTTNG_KERNEL_ABI_TRACER_ABI_VERSION
42cabb80 371 * Returns the LTTng kernel tracer ABI version
606828e4 372 * LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE
750b05f2 373 * Returns a LTTng event notifier group file descriptor
ad1c05e1
MD		 374 *
375 * The returned session will be deleted when its file descriptor is closed.
376 */
377static
c0e31d2e 378long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ad1c05e1
MD		 379{
380 switch (cmd) {
606828e4
MD		 381 case LTTNG_KERNEL_ABI_OLD_SESSION:
382 case LTTNG_KERNEL_ABI_SESSION:
ad1c05e1 383 return lttng_abi_create_session();
606828e4 384 case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE:
750b05f2 385 return lttng_abi_create_event_notifier_group();
606828e4 386 case LTTNG_KERNEL_ABI_OLD_TRACER_VERSION:
6dccd6c1 387 {
606828e4
MD		 388 struct lttng_kernel_abi_tracer_version v;
389 struct lttng_kernel_abi_old_tracer_version oldv;
390 struct lttng_kernel_abi_old_tracer_version *uversion =
391 (struct lttng_kernel_abi_old_tracer_version __user *) arg;
6dccd6c1
JD		 392
393 lttng_abi_tracer_version(&v);
394 oldv.major = v.major;
395 oldv.minor = v.minor;
396 oldv.patchlevel = v.patchlevel;
397
398 if (copy_to_user(uversion, &oldv, sizeof(oldv)))
399 return -EFAULT;
400 return 0;
401 }
606828e4 402 case LTTNG_KERNEL_ABI_TRACER_VERSION:
6dccd6c1 403 {
606828e4
MD		 404 struct lttng_kernel_abi_tracer_version version;
405 struct lttng_kernel_abi_tracer_version *uversion =
406 (struct lttng_kernel_abi_tracer_version __user *) arg;
6dccd6c1
JD		 407
408 lttng_abi_tracer_version(&version);
42cabb80
MD		 409
410 if (copy_to_user(uversion, &version, sizeof(version)))
411 return -EFAULT;
412 return 0;
413 }
606828e4 414 case LTTNG_KERNEL_ABI_TRACER_ABI_VERSION:
42cabb80 415 {
606828e4
MD		 416 struct lttng_kernel_abi_tracer_abi_version version;
417 struct lttng_kernel_abi_tracer_abi_version *uversion =
418 (struct lttng_kernel_abi_tracer_abi_version __user *) arg;
42cabb80
MD		 419
420 lttng_abi_tracer_abi_version(&version);
421
6dccd6c1
JD		 422 if (copy_to_user(uversion, &version, sizeof(version)))
423 return -EFAULT;
424 return 0;
425 }
606828e4
MD		 426 case LTTNG_KERNEL_ABI_OLD_TRACEPOINT_LIST:
427 case LTTNG_KERNEL_ABI_TRACEPOINT_LIST:
271b6681 428 return lttng_abi_tracepoint_list();
606828e4 429 case LTTNG_KERNEL_ABI_SYSCALL_LIST:
2d2464bd 430 return lttng_abi_syscall_list();
606828e4
MD		 431 case LTTNG_KERNEL_ABI_OLD_WAIT_QUIESCENT:
432 case LTTNG_KERNEL_ABI_WAIT_QUIESCENT:
5f7f9078
MD		 433 synchronize_trace();
434 return 0;
606828e4 435 case LTTNG_KERNEL_ABI_OLD_CALIBRATE:
6dccd6c1 436 {
606828e4
MD		 437 struct lttng_kernel_abi_old_calibrate __user *ucalibrate =
438 (struct lttng_kernel_abi_old_calibrate __user *) arg;
439 struct lttng_kernel_abi_old_calibrate old_calibrate;
440 struct lttng_kernel_abi_calibrate calibrate;
6dccd6c1
JD		 441 int ret;
442
443 if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate)))
444 return -EFAULT;
445 calibrate.type = old_calibrate.type;
446 ret = lttng_calibrate(&calibrate);
447 if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate)))
448 return -EFAULT;
449 return ret;
450 }
606828e4 451 case LTTNG_KERNEL_ABI_CALIBRATE:
57105fc2 452 {
606828e4
MD		 453 struct lttng_kernel_abi_calibrate __user *ucalibrate =
454 (struct lttng_kernel_abi_calibrate __user *) arg;
455 struct lttng_kernel_abi_calibrate calibrate;
57105fc2
MD		 456 int ret;
457
458 if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate)))
459 return -EFAULT;
460 ret = lttng_calibrate(&calibrate);
461 if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate)))
462 return -EFAULT;
463 return ret;
464 }
ad1c05e1
MD		 465 default:
466 return -ENOIOCTLCMD;
467 }
468}
469
5f4c791e 470#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
059de147
MJ		 471static const struct proc_ops lttng_proc_ops = {
472 .proc_ioctl = lttng_ioctl,
473#ifdef CONFIG_COMPAT
474 .proc_compat_ioctl = lttng_ioctl,
475#endif /* CONFIG_COMPAT */
476};
477#else
478static const struct file_operations lttng_proc_ops = {
a33c9927 479 .owner = THIS_MODULE,
ad1c05e1
MD		 480 .unlocked_ioctl = lttng_ioctl,
481#ifdef CONFIG_COMPAT
03037b98 482 .compat_ioctl = lttng_ioctl,
059de147 483#endif /* CONFIG_COMPAT */
11b5a3c2 484};
059de147 485#endif
ad1c05e1 486
5dbbdb43 487static
c0e31d2e 488int lttng_abi_create_channel(struct file *session_file,
606828e4 489 struct lttng_kernel_abi_channel *chan_param,
5dbbdb43 490 enum channel_type channel_type)
baf20995 491{
a40e3229 492 struct lttng_kernel_session *session = session_file->private_data;
88dfd899 493 const struct file_operations *fops = NULL;
5dbbdb43 494 const char *transport_name;
ac847066 495 struct lttng_kernel_channel_buffer *chan;
c0e31d2e 496 struct file *chan_file;
baf20995 497 int chan_fd;
ad1c05e1 498 int ret = 0;
baf20995 499
4ac10b76 500 chan_fd = lttng_get_unused_fd();
baf20995
MD		 501 if (chan_fd < 0) {
502 ret = chan_fd;
503 goto fd_error;
504 }
88dfd899
MD		 505 switch (channel_type) {
506 case PER_CPU_CHANNEL:
507 fops = &lttng_channel_fops;
508 break;
509 case METADATA_CHANNEL:
510 fops = &lttng_metadata_fops;
511 break;
512 }
2470a237 513
c0e31d2e 514 chan_file = anon_inode_getfile("[lttng_channel]",
88dfd899 515 fops,
03037b98 516 NULL, O_RDWR);
c0e31d2e
MD		 517 if (IS_ERR(chan_file)) {
518 ret = PTR_ERR(chan_file);
baf20995
MD		 519 goto file_error;
520 }
5dbbdb43
MD		 521 switch (channel_type) {
522 case PER_CPU_CHANNEL:
606828e4 523 if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) {
6dccd6c1 524 transport_name = chan_param->overwrite ?
96ba7208 525 "relay-overwrite" : "relay-discard";
606828e4 526 } else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) {
6dccd6c1 527 transport_name = chan_param->overwrite ?
96ba7208
JD		 528 "relay-overwrite-mmap" : "relay-discard-mmap";
529 } else {
530 return -EINVAL;
531 }
5dbbdb43 532 break;
5dbbdb43 533 case METADATA_CHANNEL:
606828e4 534 if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE)
96ba7208 535 transport_name = "relay-metadata";
606828e4 536 else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP)
96ba7208
JD		 537 transport_name = "relay-metadata-mmap";
538 else
539 return -EINVAL;
5dbbdb43
MD		 540 break;
541 default:
542 transport_name = "<unknown>";
543 break;
544 }
98d7281c
MJ		 545 if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) {
546 ret = -EOVERFLOW;
9c1f4643
MD		 547 goto refcount_error;
548 }
03037b98
MD		 549 /*
550 * We tolerate no failure path after channel creation. It will stay
551 * invariant for the rest of the session.
552 */
a90917c3 553 chan = lttng_channel_create(session, transport_name, NULL,
6dccd6c1
JD		 554 chan_param->subbuf_size,
555 chan_param->num_subbuf,
556 chan_param->switch_timer_interval,
d83004aa
JD		 557 chan_param->read_timer_interval,
558 channel_type);
03037b98 559 if (!chan) {
f3d01b96 560 ret = -EINVAL;
03037b98
MD		 561 goto chan_error;
562 }
ac847066 563 chan->priv->parent.file = chan_file;
c0e31d2e
MD		 564 chan_file->private_data = chan;
565 fd_install(chan_fd, chan_file);
ad1c05e1 566
baf20995
MD		 567 return chan_fd;
568
03037b98 569chan_error:
9c1f4643
MD		 570 atomic_long_dec(&session_file->f_count);
571refcount_error:
c0e31d2e 572 fput(chan_file);
baf20995
MD		 573file_error:
574 put_unused_fd(chan_fd);
575fd_error:
baf20995
MD		 576 return ret;
577}
578
7f859fbf 579static
a40e3229 580int lttng_abi_session_set_name(struct lttng_kernel_session *session,
606828e4 581 struct lttng_kernel_abi_session_name *name)
7f859fbf
JR		 582{
583 size_t len;
584
606828e4 585 len = strnlen(name->name, LTTNG_KERNEL_ABI_SESSION_NAME_LEN);
7f859fbf 586
606828e4 587 if (len == LTTNG_KERNEL_ABI_SESSION_NAME_LEN) {
7f859fbf
JR		 588 /* Name is too long/malformed */
589 return -EINVAL;
590 }
591
a40e3229 592 strcpy(session->priv->name, name->name);
7f859fbf
JR		 593 return 0;
594}
595
1c88f269 596static
a40e3229 597int lttng_abi_session_set_creation_time(struct lttng_kernel_session *session,
606828e4 598 struct lttng_kernel_abi_session_creation_time *time)
1c88f269
JR		 599{
600 size_t len;
601
606828e4 602 len = strnlen(time->iso8601, LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN);
1c88f269 603
606828e4 604 if (len == LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN) {
1c88f269
JR		 605 /* Time is too long/malformed */
606 return -EINVAL;
607 }
608
a40e3229 609 strcpy(session->priv->creation_time, time->iso8601);
1c88f269
JR		 610 return 0;
611}
612
99f52fcc
FD		 613static
614int lttng_counter_release(struct inode *inode, struct file *file)
615{
616 struct lttng_counter *counter = file->private_data;
617
618 if (counter) {
619 /*
620 * Do not destroy the counter itself. Wait of the owner
621 * (event_notifier group) to be destroyed.
622 */
623 fput(counter->owner);
624 }
625
626 return 0;
627}
628
629static
630long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
631{
632 struct lttng_counter *counter = file->private_data;
606828e4 633 size_t indexes[LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX] = { 0 };
99f52fcc
FD		 634 int i;
635
636 switch (cmd) {
606828e4 637 case LTTNG_KERNEL_ABI_COUNTER_READ:
99f52fcc 638 {
606828e4
MD		 639 struct lttng_kernel_abi_counter_read local_counter_read;
640 struct lttng_kernel_abi_counter_read __user *ucounter_read =
641 (struct lttng_kernel_abi_counter_read __user *) arg;
99f52fcc
FD		 642 bool overflow, underflow;
643 int64_t value;
644 int32_t cpu;
645 int ret;
646
647 if (copy_from_user(&local_counter_read, ucounter_read,
648 sizeof(local_counter_read)))
649 return -EFAULT;
650 if (validate_zeroed_padding(local_counter_read.padding,
651 sizeof(local_counter_read.padding)))
652 return -EINVAL;
7d42b129
MD		 653 if (local_counter_read.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX)
654 return -EINVAL;
99f52fcc
FD		 655
656 /* Cast all indexes into size_t. */
657 for (i = 0; i < local_counter_read.index.number_dimensions; i++)
658 indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i];
659 cpu = local_counter_read.cpu;
660
661 ret = lttng_kernel_counter_read(counter, indexes, cpu, &value,
662 &overflow, &underflow);
663 if (ret)
664 return ret;
665 local_counter_read.value.value = value;
666 local_counter_read.value.overflow = overflow;
667 local_counter_read.value.underflow = underflow;
668
669 if (copy_to_user(&ucounter_read->value, &local_counter_read.value,
670 sizeof(local_counter_read.value)))
671 return -EFAULT;
672
673 return 0;
674 }
606828e4 675 case LTTNG_KERNEL_ABI_COUNTER_AGGREGATE:
99f52fcc 676 {
606828e4
MD		 677 struct lttng_kernel_abi_counter_aggregate local_counter_aggregate;
678 struct lttng_kernel_abi_counter_aggregate __user *ucounter_aggregate =
679 (struct lttng_kernel_abi_counter_aggregate __user *) arg;
99f52fcc
FD		 680 bool overflow, underflow;
681 int64_t value;
682 int ret;
683
684 if (copy_from_user(&local_counter_aggregate, ucounter_aggregate,
685 sizeof(local_counter_aggregate)))
686 return -EFAULT;
687 if (validate_zeroed_padding(local_counter_aggregate.padding,
688 sizeof(local_counter_aggregate.padding)))
689 return -EINVAL;
7d42b129
MD		 690 if (local_counter_aggregate.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX)
691 return -EINVAL;
99f52fcc
FD		 692
693 /* Cast all indexes into size_t. */
694 for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++)
695 indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i];
696
697 ret = lttng_kernel_counter_aggregate(counter, indexes, &value,
698 &overflow, &underflow);
699 if (ret)
700 return ret;
701 local_counter_aggregate.value.value = value;
702 local_counter_aggregate.value.overflow = overflow;
703 local_counter_aggregate.value.underflow = underflow;
704
705 if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value,
706 sizeof(local_counter_aggregate.value)))
707 return -EFAULT;
708
709 return 0;
710 }
606828e4 711 case LTTNG_KERNEL_ABI_COUNTER_CLEAR:
99f52fcc 712 {
606828e4
MD		 713 struct lttng_kernel_abi_counter_clear local_counter_clear;
714 struct lttng_kernel_abi_counter_clear __user *ucounter_clear =
715 (struct lttng_kernel_abi_counter_clear __user *) arg;
99f52fcc
FD		 716
717 if (copy_from_user(&local_counter_clear, ucounter_clear,
718 sizeof(local_counter_clear)))
719 return -EFAULT;
720 if (validate_zeroed_padding(local_counter_clear.padding,
721 sizeof(local_counter_clear.padding)))
722 return -EINVAL;
7d42b129
MD		 723 if (local_counter_clear.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX)
724 return -EINVAL;
99f52fcc
FD		 725
726 /* Cast all indexes into size_t. */
727 for (i = 0; i < local_counter_clear.index.number_dimensions; i++)
728 indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i];
729
730 return lttng_kernel_counter_clear(counter, indexes);
731 }
732 default:
99f52fcc
FD		 733 return -ENOSYS;
734 }
735}
736
737static const struct file_operations lttng_counter_fops = {
738 .owner = THIS_MODULE,
739 .release = lttng_counter_release,
740 .unlocked_ioctl = lttng_counter_ioctl,
741#ifdef CONFIG_COMPAT
742 .compat_ioctl = lttng_counter_ioctl,
743#endif
744};
745
746
d1f652f8 747static
606828e4 748enum tracker_type get_tracker_type(struct lttng_kernel_abi_tracker_args *tracker)
d1f652f8
MD		 749{
750 switch (tracker->type) {
606828e4 751 case LTTNG_KERNEL_ABI_TRACKER_PID:
d1f652f8 752 return TRACKER_PID;
606828e4 753 case LTTNG_KERNEL_ABI_TRACKER_VPID:
d1f652f8 754 return TRACKER_VPID;
606828e4 755 case LTTNG_KERNEL_ABI_TRACKER_UID:
d1f652f8 756 return TRACKER_UID;
606828e4 757 case LTTNG_KERNEL_ABI_TRACKER_VUID:
d1f652f8 758 return TRACKER_VUID;
606828e4 759 case LTTNG_KERNEL_ABI_TRACKER_GID:
d1f652f8 760 return TRACKER_GID;
606828e4 761 case LTTNG_KERNEL_ABI_TRACKER_VGID:
d1f652f8
MD		 762 return TRACKER_VGID;
763 default:
764 return TRACKER_UNKNOWN;
765 }
766}
767
baf20995 768/**
ad1c05e1 769 * lttng_session_ioctl - lttng session fd ioctl
baf20995 770 *
c0e31d2e 771 * @file: the file
baf20995
MD		 772 * @cmd: the command
773 * @arg: command arg
774 *
775 * This ioctl implements lttng commands:
606828e4 776 * LTTNG_KERNEL_ABI_CHANNEL
baf20995 777 * Returns a LTTng channel file descriptor
606828e4 778 * LTTNG_KERNEL_ABI_ENABLE
e64957da 779 * Enables tracing for a session (weak enable)
606828e4 780 * LTTNG_KERNEL_ABI_DISABLE
e64957da 781 * Disables tracing for a session (strong disable)
606828e4 782 * LTTNG_KERNEL_ABI_METADATA
8070f5c0 783 * Returns a LTTng metadata file descriptor
606828e4 784 * LTTNG_KERNEL_ABI_SESSION_TRACK_PID
d1f652f8 785 * Add PID to session PID tracker
606828e4 786 * LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID
d1f652f8 787 * Remove PID from session PID tracker
606828e4 788 * LTTNG_KERNEL_ABI_SESSION_TRACK_ID
d1f652f8 789 * Add ID to tracker
606828e4 790 * LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID
d1f652f8 791 * Remove ID from tracker
ad1c05e1
MD		 792 *
793 * The returned channel will be deleted when its file descriptor is closed.
794 */
795static
c0e31d2e 796long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ad1c05e1 797{
a40e3229 798 struct lttng_kernel_session *session = file->private_data;
606828e4
MD		 799 struct lttng_kernel_abi_channel chan_param;
800 struct lttng_kernel_abi_old_channel old_chan_param;
c0e31d2e 801
8c71721f
MD		 802 /*
803 * Handle backward compatibility. OLD commands have wrong
804 * directions, replace them by the correct direction.
805 */
806 switch (cmd) {
807 case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_PID:
808 cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_PID;
809 break;
810 case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_PID:
811 cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID;
812 break;
813 case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_ID:
814 cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_ID;
815 break;
816 case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_ID:
817 cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID;
818 break;
819 case LTTNG_KERNEL_ABI_OLD_SESSION_LIST_TRACKER_IDS:
820 cmd = LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS;
821 break;
822 case LTTNG_KERNEL_ABI_OLD_SESSION_SET_NAME:
823 cmd = LTTNG_KERNEL_ABI_SESSION_SET_NAME;
824 break;
825 case LTTNG_KERNEL_ABI_OLD_SESSION_SET_CREATION_TIME:
826 cmd = LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME;
827 break;
828 default:
829 /* Nothing to do. */
830 break;
831 }
832
ad1c05e1 833 switch (cmd) {
606828e4 834 case LTTNG_KERNEL_ABI_OLD_CHANNEL:
6dccd6c1 835 {
6dccd6c1 836 if (copy_from_user(&old_chan_param,
606828e4
MD		 837 (struct lttng_kernel_abi_old_channel __user *) arg,
838 sizeof(struct lttng_kernel_abi_old_channel)))
6dccd6c1
JD		 839 return -EFAULT;
840 chan_param.overwrite = old_chan_param.overwrite;
841 chan_param.subbuf_size = old_chan_param.subbuf_size;
842 chan_param.num_subbuf = old_chan_param.num_subbuf;
843 chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
844 chan_param.read_timer_interval = old_chan_param.read_timer_interval;
845 chan_param.output = old_chan_param.output;
846
847 return lttng_abi_create_channel(file, &chan_param,
848 PER_CPU_CHANNEL);
849 }
606828e4 850 case LTTNG_KERNEL_ABI_CHANNEL:
6dccd6c1 851 {
6dccd6c1 852 if (copy_from_user(&chan_param,
606828e4
MD		 853 (struct lttng_kernel_abi_channel __user *) arg,
854 sizeof(struct lttng_kernel_abi_channel)))
6dccd6c1
JD		 855 return -EFAULT;
856 return lttng_abi_create_channel(file, &chan_param,
5dbbdb43 857 PER_CPU_CHANNEL);
6dccd6c1 858 }
606828e4
MD		 859 case LTTNG_KERNEL_ABI_OLD_SESSION_START:
860 case LTTNG_KERNEL_ABI_OLD_ENABLE:
861 case LTTNG_KERNEL_ABI_SESSION_START:
862 case LTTNG_KERNEL_ABI_ENABLE:
a90917c3 863 return lttng_session_enable(session);
606828e4
MD		 864 case LTTNG_KERNEL_ABI_OLD_SESSION_STOP:
865 case LTTNG_KERNEL_ABI_OLD_DISABLE:
866 case LTTNG_KERNEL_ABI_SESSION_STOP:
867 case LTTNG_KERNEL_ABI_DISABLE:
a90917c3 868 return lttng_session_disable(session);
606828e4 869 case LTTNG_KERNEL_ABI_OLD_METADATA:
6dccd6c1 870 {
6dccd6c1 871 if (copy_from_user(&old_chan_param,
606828e4
MD		 872 (struct lttng_kernel_abi_old_channel __user *) arg,
873 sizeof(struct lttng_kernel_abi_old_channel)))
6dccd6c1
JD		 874 return -EFAULT;
875 chan_param.overwrite = old_chan_param.overwrite;
876 chan_param.subbuf_size = old_chan_param.subbuf_size;
877 chan_param.num_subbuf = old_chan_param.num_subbuf;
878 chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
879 chan_param.read_timer_interval = old_chan_param.read_timer_interval;
880 chan_param.output = old_chan_param.output;
881
882 return lttng_abi_create_channel(file, &chan_param,
883 METADATA_CHANNEL);
884 }
606828e4 885 case LTTNG_KERNEL_ABI_METADATA:
6dccd6c1 886 {
6dccd6c1 887 if (copy_from_user(&chan_param,
606828e4
MD		 888 (struct lttng_kernel_abi_channel __user *) arg,
889 sizeof(struct lttng_kernel_abi_channel)))
6dccd6c1
JD		 890 return -EFAULT;
891 return lttng_abi_create_channel(file, &chan_param,
5dbbdb43 892 METADATA_CHANNEL);
6dccd6c1 893 }
606828e4 894 case LTTNG_KERNEL_ABI_SESSION_TRACK_PID:
d1f652f8 895 return lttng_session_track_id(session, TRACKER_PID, (int) arg);
606828e4 896 case LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID:
d1f652f8 897 return lttng_session_untrack_id(session, TRACKER_PID, (int) arg);
606828e4 898 case LTTNG_KERNEL_ABI_SESSION_TRACK_ID:
d1f652f8 899 {
606828e4 900 struct lttng_kernel_abi_tracker_args tracker;
d1f652f8
MD		 901 enum tracker_type tracker_type;
902
903 if (copy_from_user(&tracker,
606828e4
MD		 904 (struct lttng_kernel_abi_tracker_args __user *) arg,
905 sizeof(struct lttng_kernel_abi_tracker_args)))
d1f652f8
MD		 906 return -EFAULT;
907 tracker_type = get_tracker_type(&tracker);
908 if (tracker_type == TRACKER_UNKNOWN)
909 return -EINVAL;
910 return lttng_session_track_id(session, tracker_type, tracker.id);
911 }
606828e4 912 case LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID:
d1f652f8 913 {
606828e4 914 struct lttng_kernel_abi_tracker_args tracker;
d1f652f8
MD		 915 enum tracker_type tracker_type;
916
917 if (copy_from_user(&tracker,
606828e4
MD		 918 (struct lttng_kernel_abi_tracker_args __user *) arg,
919 sizeof(struct lttng_kernel_abi_tracker_args)))
d1f652f8
MD		 920 return -EFAULT;
921 tracker_type = get_tracker_type(&tracker);
922 if (tracker_type == TRACKER_UNKNOWN)
923 return -EINVAL;
924 return lttng_session_untrack_id(session, tracker_type,
925 tracker.id);
926 }
606828e4 927 case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_PIDS:
d1f652f8 928 return lttng_session_list_tracker_ids(session, TRACKER_PID);
606828e4 929 case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS:
d1f652f8 930 {
606828e4 931 struct lttng_kernel_abi_tracker_args tracker;
d1f652f8
MD		 932 enum tracker_type tracker_type;
933
934 if (copy_from_user(&tracker,
606828e4
MD		 935 (struct lttng_kernel_abi_tracker_args __user *) arg,
936 sizeof(struct lttng_kernel_abi_tracker_args)))
d1f652f8
MD		 937 return -EFAULT;
938 tracker_type = get_tracker_type(&tracker);
939 if (tracker_type == TRACKER_UNKNOWN)
940 return -EINVAL;
941 return lttng_session_list_tracker_ids(session, tracker_type);
942 }
606828e4 943 case LTTNG_KERNEL_ABI_SESSION_METADATA_REGEN:
9616f0bf 944 return lttng_session_metadata_regenerate(session);
606828e4 945 case LTTNG_KERNEL_ABI_SESSION_STATEDUMP:
601252cf 946 return lttng_session_statedump(session);
606828e4 947 case LTTNG_KERNEL_ABI_SESSION_SET_NAME:
7f859fbf 948 {
606828e4 949 struct lttng_kernel_abi_session_name name;
7f859fbf
JR		 950
951 if (copy_from_user(&name,
606828e4
MD		 952 (struct lttng_kernel_abi_session_name __user *) arg,
953 sizeof(struct lttng_kernel_abi_session_name)))
7f859fbf
JR		 954 return -EFAULT;
955 return lttng_abi_session_set_name(session, &name);
956 }
606828e4 957 case LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME:
1c88f269 958 {
606828e4 959 struct lttng_kernel_abi_session_creation_time time;
1c88f269
JR		 960
961 if (copy_from_user(&time,
606828e4
MD		 962 (struct lttng_kernel_abi_session_creation_time __user *) arg,
963 sizeof(struct lttng_kernel_abi_session_creation_time)))
1c88f269
JR		 964 return -EFAULT;
965 return lttng_abi_session_set_creation_time(session, &time);
966 }
ad1c05e1
MD		 967 default:
968 return -ENOIOCTLCMD;
969 }
970}
971
03037b98
MD		 972/*
973 * Called when the last file reference is dropped.
974 *
975 * Big fat note: channels and events are invariant for the whole session after
976 * their creation. So this session destruction also destroys all channel and
977 * event structures specific to this session (they are not destroyed when their
978 * individual file is released).
979 */
ad1c05e1 980static
03037b98 981int lttng_session_release(struct inode *inode, struct file *file)
ad1c05e1 982{
a40e3229 983 struct lttng_kernel_session *session = file->private_data;
c269fff4
MD		 984
985 if (session)
a90917c3 986 lttng_session_destroy(session);
11b5a3c2 987 return 0;
ad1c05e1 988}
ad1c05e1
MD		 989
990static const struct file_operations lttng_session_fops = {
a33c9927 991 .owner = THIS_MODULE,
03037b98 992 .release = lttng_session_release,
ad1c05e1
MD		 993 .unlocked_ioctl = lttng_session_ioctl,
994#ifdef CONFIG_COMPAT
03037b98 995 .compat_ioctl = lttng_session_ioctl,
ad1c05e1 996#endif
11b5a3c2 997};
ad1c05e1 998
db2511b4
MD		 999/*
1000 * When encountering empty buffer, flush current sub-buffer if non-empty
1001 * and retry (if new data available to read after flush).
1002 */
1003static
1004ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf,
1005 size_t count, loff_t *ppos)
1006{
1007 struct lttng_event_notifier_group *event_notifier_group = filp->private_data;
4071a628 1008 struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan;
a2a1b5ab 1009 struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
db2511b4
MD		 1010 ssize_t read_count = 0, len;
1011 size_t read_offset;
1012
1013 might_sleep();
1014 if (!lttng_access_ok(VERIFY_WRITE, user_buf, count))
1015 return -EFAULT;
1016
1017 /* Finish copy of previous record */
1018 if (*ppos != 0) {
e8474d9d 1019 if (count != 0) {
db2511b4
MD		 1020 len = chan->iter.len_left;
1021 read_offset = *ppos;
1022 goto skip_get_next;
1023 }
1024 }
1025
1026 while (read_count < count) {
1027 size_t copy_len, space_left;
1028
1029 len = lib_ring_buffer_get_next_record(chan, buf);
1030len_test:
1031 if (len < 0) {
1032 /*
1033 * Check if buffer is finalized (end of file).
1034 */
1035 if (len == -ENODATA) {
1036 /* A 0 read_count will tell about end of file */
1037 goto nodata;
1038 }
1039 if (filp->f_flags & O_NONBLOCK) {
1040 if (!read_count)
1041 read_count = -EAGAIN;
1042 goto nodata;
1043 } else {
1044 int error;
1045
1046 /*
1047 * No data available at the moment, return what
1048 * we got.
1049 */
1050 if (read_count)
1051 goto nodata;
1052
1053 /*
1054 * Wait for returned len to be >= 0 or -ENODATA.
1055 */
1056 error = wait_event_interruptible(
1057 event_notifier_group->read_wait,
1058 ((len = lib_ring_buffer_get_next_record(
1059 chan, buf)), len != -EAGAIN));
1060 CHAN_WARN_ON(chan, len == -EBUSY);
1061 if (error) {
1062 read_count = error;
1063 goto nodata;
1064 }
1065 CHAN_WARN_ON(chan, len < 0 && len != -ENODATA);
1066 goto len_test;
1067 }
1068 }
1069 read_offset = buf->iter.read_offset;
1070skip_get_next:
1071 space_left = count - read_count;
1072 if (len <= space_left) {
1073 copy_len = len;
1074 chan->iter.len_left = 0;
1075 *ppos = 0;
1076 } else {
1077 copy_len = space_left;
1078 chan->iter.len_left = len - copy_len;
1079 *ppos = read_offset + copy_len;
1080 }
1081 if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset,
1082 &user_buf[read_count],
1083 copy_len)) {
1084 /*
1085 * Leave the len_left and ppos values at their current
1086 * state, as we currently have a valid event to read.
1087 */
1088 return -EFAULT;
1089 }
1090 read_count += copy_len;
1091 }
31c02fb7 1092 goto put_record;
db2511b4
MD		 1093
1094nodata:
1095 *ppos = 0;
1096 chan->iter.len_left = 0;
31c02fb7
MD		 1097
1098put_record:
e8474d9d
MD		 1099 if (*ppos == 0)
1100 lib_ring_buffer_put_current_record(buf);
db2511b4
MD		 1101 return read_count;
1102}
1103
1104/*
1105 * If the ring buffer is non empty (even just a partial subbuffer), return that
1106 * there is data available. Perform a ring buffer flush if we encounter a
1107 * non-empty ring buffer which does not have any consumeable subbuffer available.
1108 */
1109static
1110unsigned int lttng_event_notifier_group_notif_poll(struct file *filp,
1111 poll_table *wait)
1112{
1113 unsigned int mask = 0;
1114 struct lttng_event_notifier_group *event_notifier_group = filp->private_data;
4071a628 1115 struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan;
a2a1b5ab
MD		 1116 struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
1117 const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config;
db2511b4
MD		 1118 int finalized, disabled;
1119 unsigned long consumed, offset;
18f12d55 1120 size_t subbuffer_header_size = config->cb.subbuffer_header_size();
db2511b4
MD		 1121
1122 if (filp->f_mode & FMODE_READ) {
1123 poll_wait_set_exclusive(wait);
1124 poll_wait(filp, &event_notifier_group->read_wait, wait);
1125
1126 finalized = lib_ring_buffer_is_finalized(config, buf);
1127 disabled = lib_ring_buffer_channel_is_disabled(chan);
1128
1129 /*
1130 * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering
1131 * finalized load before offsets loads.
1132 */
1133 WARN_ON(atomic_long_read(&buf->active_readers) != 1);
1134retry:
1135 if (disabled)
1136 return POLLERR;
1137
1138 offset = lib_ring_buffer_get_offset(config, buf);
1139 consumed = lib_ring_buffer_get_consumed(config, buf);
1140
1141 /*
1142 * If there is no buffer available to consume.
1143 */
1144 if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) {
1145 /*
1146 * If there is a non-empty subbuffer, flush and try again.
1147 */
18f12d55 1148 if (subbuf_offset(offset, chan) > subbuffer_header_size) {
db2511b4
MD		 1149 lib_ring_buffer_switch_remote(buf);
1150 goto retry;
1151 }
1152
1153 if (finalized)
1154 return POLLHUP;
1155 else {
1156 /*
1157 * The memory barriers
1158 * __wait_event()/wake_up_interruptible() take
1159 * care of "raw_spin_is_locked" memory ordering.
1160 */
1161 if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock))
1162 goto retry;
1163 else
1164 return 0;
1165 }
1166 } else {
1167 if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan)
1168 >= chan->backend.buf_size)
1169 return POLLPRI | POLLRDBAND;
1170 else
1171 return POLLIN | POLLRDNORM;
1172 }
1173 }
1174
1175 return mask;
1176}
1177
1178/**
1179 * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation
1180 * @inode: opened inode
1181 * @file: opened file
1182 *
1183 * Open implementation. Makes sure only one open instance of a buffer is
1184 * done at a given moment.
1185 */
1186static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file)
1187{
1188 struct lttng_event_notifier_group *event_notifier_group = inode->i_private;
a2a1b5ab 1189 struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
db2511b4
MD		 1190
1191 file->private_data = event_notifier_group;
1192 return lib_ring_buffer_open(inode, file, buf);
1193}
1194
1195/**
1196 * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation
1197 * @inode: opened inode
1198 * @file: opened file
1199 *
1200 * Release implementation.
1201 */
1202static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file)
1203{
1204 struct lttng_event_notifier_group *event_notifier_group = file->private_data;
a2a1b5ab 1205 struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
db2511b4
MD		 1206 int ret;
1207
1208 ret = lib_ring_buffer_release(inode, file, buf);
1209 if (ret)
1210 return ret;
1211 fput(event_notifier_group->file);
1212 return 0;
1213}
1214
21f58fb7
FD		 1215static const struct file_operations lttng_event_notifier_group_notif_fops = {
1216 .owner = THIS_MODULE,
db2511b4
MD		 1217 .open = lttng_event_notifier_group_notif_open,
1218 .release = lttng_event_notifier_group_notif_release,
1219 .read = lttng_event_notifier_group_notif_read,
1220 .poll = lttng_event_notifier_group_notif_poll,
21f58fb7
FD		 1221};
1222
d83004aa
JD		 1223/**
1224 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
1225 * @filp: the file
1226 * @wait: poll table
1227 *
1228 * Handles the poll operations for the metadata channels.
1229 */
ad1c05e1 1230static
d83004aa
JD		 1231unsigned int lttng_metadata_ring_buffer_poll(struct file *filp,
1232 poll_table *wait)
1233{
1234 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1235 struct lttng_kernel_ring_buffer *buf = stream->priv;
d83004aa
JD		 1236 int finalized;
1237 unsigned int mask = 0;
1238
1239 if (filp->f_mode & FMODE_READ) {
1240 poll_wait_set_exclusive(wait);
1241 poll_wait(filp, &stream->read_wait, wait);
1242
1243 finalized = stream->finalized;
1244
1245 /*
1246 * lib_ring_buffer_is_finalized() contains a smp_rmb()
1247 * ordering finalized load before offsets loads.
1248 */
1249 WARN_ON(atomic_long_read(&buf->active_readers) != 1);
1250
1251 if (finalized)
1252 mask |= POLLHUP;
1253
92d9f5e6 1254 mutex_lock(&stream->metadata_cache->lock);
d83004aa 1255 if (stream->metadata_cache->metadata_written >
f613e3e6 1256 stream->metadata_out)
d83004aa 1257 mask |= POLLIN;
92d9f5e6 1258 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 1259 }
1260
1261 return mask;
1262}
1263
f613e3e6
MD		 1264static
1265void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp,
1266 unsigned int cmd, unsigned long arg)
1267{
1268 struct lttng_metadata_stream *stream = filp->private_data;
1269
1270 stream->metadata_out = stream->metadata_in;
1271}
1272
d1344afa
JD		 1273/*
1274 * Reset the counter of how much metadata has been consumed to 0. That way,
1275 * the consumer receives the content of the metadata cache unchanged. This is
1276 * different from the metadata_regenerate where the offset from epoch is
1277 * resampled, here we want the exact same content as the last time the metadata
1278 * was generated. This command is only possible if all the metadata written
1279 * in the cache has been output to the metadata stream to avoid corrupting the
1280 * metadata file.
1281 *
1282 * Return 0 on success, a negative value on error.
1283 */
1284static
1285int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream)
1286{
1287 int ret;
1288 struct lttng_metadata_cache *cache = stream->metadata_cache;
1289
1290 mutex_lock(&cache->lock);
1291 if (stream->metadata_out != cache->metadata_written) {
1292 ret = -EBUSY;
1293 goto end;
1294 }
1295 stream->metadata_out = 0;
1296 stream->metadata_in = 0;
1297 wake_up_interruptible(&stream->read_wait);
1298 ret = 0;
1299
1300end:
1301 mutex_unlock(&cache->lock);
1302 return ret;
1303}
1304
d83004aa
JD		 1305static
1306long lttng_metadata_ring_buffer_ioctl(struct file *filp,
1307 unsigned int cmd, unsigned long arg)
1308{
1309 int ret;
1310 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1311 struct lttng_kernel_ring_buffer *buf = stream->priv;
8b97fd42
MD		 1312 unsigned int rb_cmd;
1313 bool coherent;
1314
606828e4
MD		 1315 if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK)
1316 rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF;
8b97fd42
MD		 1317 else
1318 rb_cmd = cmd;
d83004aa
JD		 1319
1320 switch (cmd) {
606828e4 1321 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF:
d83004aa 1322 {
35097f36 1323 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1324 struct lttng_kernel_ring_buffer *buf = stream->priv;
4071a628 1325 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
35097f36 1326
8b97fd42 1327 ret = lttng_metadata_output_channel(stream, chan, NULL);
35097f36
JD		 1328 if (ret > 0) {
1329 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1330 ret = 0;
1331 } else if (ret < 0)
d83004aa
JD		 1332 goto err;
1333 break;
1334 }
606828e4 1335 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF:
f613e3e6
MD		 1336 {
1337 /*
1338 * Random access is not allowed for metadata channel.
1339 */
1340 return -ENOSYS;
1341 }
c570be0d
MJ		 1342 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY:
1343 lttng_fallthrough;
606828e4 1344 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH:
35097f36
JD		 1345 {
1346 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1347 struct lttng_kernel_ring_buffer *buf = stream->priv;
4071a628 1348 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
35097f36
JD		 1349
1350 /*
1351 * Before doing the actual ring buffer flush, write up to one
1352 * packet of metadata in the ring buffer.
1353 */
8b97fd42 1354 ret = lttng_metadata_output_channel(stream, chan, NULL);
35097f36
JD		 1355 if (ret < 0)
1356 goto err;
1357 break;
1358 }
606828e4 1359 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION:
9616f0bf
JD		 1360 {
1361 struct lttng_metadata_stream *stream = filp->private_data;
1362
1363 return put_u64(stream->version, arg);
1364 }
606828e4 1365 case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP:
d1344afa
JD		 1366 {
1367 struct lttng_metadata_stream *stream = filp->private_data;
1368
1369 return lttng_metadata_cache_dump(stream);
1370 }
606828e4 1371 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
8b97fd42
MD		 1372 {
1373 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1374 struct lttng_kernel_ring_buffer *buf = stream->priv;
4071a628 1375 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
8b97fd42
MD		 1376
1377 ret = lttng_metadata_output_channel(stream, chan, &coherent);
1378 if (ret > 0) {
1379 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1380 ret = 0;
1381 } else if (ret < 0) {
1382 goto err;
1383 }
1384 break;
1385 }
d83004aa
JD		 1386 default:
1387 break;
1388 }
f613e3e6
MD		 1389 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1390
d83004aa 1391 /* Performing lib ring buffer ioctl after our own. */
8b97fd42 1392 ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf);
f613e3e6
MD		 1393 if (ret < 0)
1394 goto err;
d83004aa 1395
f613e3e6 1396 switch (cmd) {
606828e4 1397 case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF:
f613e3e6
MD		 1398 {
1399 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
1400 cmd, arg);
1401 break;
1402 }
606828e4 1403 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
8b97fd42
MD		 1404 {
1405 return put_u32(coherent, arg);
1406 }
f613e3e6
MD		 1407 default:
1408 break;
1409 }
d83004aa
JD		 1410err:
1411 return ret;
1412}
1413
aeb9064d 1414#ifdef CONFIG_COMPAT
d83004aa
JD		 1415static
1416long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp,
1417 unsigned int cmd, unsigned long arg)
1418{
1419 int ret;
1420 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1421 struct lttng_kernel_ring_buffer *buf = stream->priv;
8b97fd42
MD		 1422 unsigned int rb_cmd;
1423 bool coherent;
1424
606828e4
MD		 1425 if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK)
1426 rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF;
8b97fd42
MD		 1427 else
1428 rb_cmd = cmd;
d83004aa
JD		 1429
1430 switch (cmd) {
606828e4 1431 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF:
d83004aa 1432 {
35097f36 1433 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1434 struct lttng_kernel_ring_buffer *buf = stream->priv;
4071a628 1435 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
35097f36 1436
8b97fd42 1437 ret = lttng_metadata_output_channel(stream, chan, NULL);
35097f36
JD		 1438 if (ret > 0) {
1439 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1440 ret = 0;
1441 } else if (ret < 0)
d83004aa
JD		 1442 goto err;
1443 break;
1444 }
606828e4 1445 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF:
f613e3e6
MD		 1446 {
1447 /*
1448 * Random access is not allowed for metadata channel.
1449 */
1450 return -ENOSYS;
1451 }
c570be0d
MJ		 1452 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY:
1453 lttng_fallthrough;
606828e4 1454 case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH:
96c55c2f
MD		 1455 {
1456 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1457 struct lttng_kernel_ring_buffer *buf = stream->priv;
4071a628 1458 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
96c55c2f
MD		 1459
1460 /*
1461 * Before doing the actual ring buffer flush, write up to one
1462 * packet of metadata in the ring buffer.
1463 */
8b97fd42 1464 ret = lttng_metadata_output_channel(stream, chan, NULL);
96c55c2f
MD		 1465 if (ret < 0)
1466 goto err;
1467 break;
1468 }
606828e4 1469 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION:
96c55c2f
MD		 1470 {
1471 struct lttng_metadata_stream *stream = filp->private_data;
1472
1473 return put_u64(stream->version, arg);
1474 }
606828e4 1475 case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP:
d1344afa
JD		 1476 {
1477 struct lttng_metadata_stream *stream = filp->private_data;
1478
1479 return lttng_metadata_cache_dump(stream);
1480 }
606828e4 1481 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
8b97fd42
MD		 1482 {
1483 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1484 struct lttng_kernel_ring_buffer *buf = stream->priv;
4071a628 1485 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
8b97fd42
MD		 1486
1487 ret = lttng_metadata_output_channel(stream, chan, &coherent);
1488 if (ret > 0) {
1489 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1490 ret = 0;
1491 } else if (ret < 0) {
1492 goto err;
1493 }
1494 break;
1495 }
d83004aa
JD		 1496 default:
1497 break;
1498 }
f613e3e6
MD		 1499 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1500
d83004aa 1501 /* Performing lib ring buffer ioctl after our own. */
8b97fd42 1502 ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf);
f613e3e6
MD		 1503 if (ret < 0)
1504 goto err;
d83004aa 1505
f613e3e6 1506 switch (cmd) {
606828e4 1507 case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF:
f613e3e6
MD		 1508 {
1509 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
1510 cmd, arg);
1511 break;
1512 }
606828e4 1513 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
8b97fd42
MD		 1514 {
1515 return put_u32(coherent, arg);
1516 }
f613e3e6
MD		 1517 default:
1518 break;
1519 }
d83004aa
JD		 1520err:
1521 return ret;
1522}
aeb9064d 1523#endif
d83004aa 1524
b3b8072b
MD		 1525/*
1526 * This is not used by anonymous file descriptors. This code is left
1527 * there if we ever want to implement an inode with open() operation.
1528 */
d83004aa
JD		 1529static
1530int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file)
1531{
1532 struct lttng_metadata_stream *stream = inode->i_private;
a2a1b5ab 1533 struct lttng_kernel_ring_buffer *buf = stream->priv;
d83004aa
JD		 1534
1535 file->private_data = buf;
b3b8072b
MD		 1536 /*
1537 * Since life-time of metadata cache differs from that of
1538 * session, we need to keep our own reference on the transport.
1539 */
1540 if (!try_module_get(stream->transport->owner)) {
5a15f70c 1541 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
b3b8072b
MD		 1542 return -EBUSY;
1543 }
d83004aa
JD		 1544 return lib_ring_buffer_open(inode, file, buf);
1545}
1546
1547static
1548int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file)
1549{
1550 struct lttng_metadata_stream *stream = file->private_data;
a2a1b5ab 1551 struct lttng_kernel_ring_buffer *buf = stream->priv;
d83004aa 1552
92143b2c
MD		 1553 mutex_lock(&stream->metadata_cache->lock);
1554 list_del(&stream->list);
1555 mutex_unlock(&stream->metadata_cache->lock);
d83004aa 1556 kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy);
b3b8072b 1557 module_put(stream->transport->owner);
92143b2c 1558 kfree(stream);
d83004aa
JD		 1559 return lib_ring_buffer_release(inode, file, buf);
1560}
1561
1562static
1563ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos,
1564 struct pipe_inode_info *pipe, size_t len,
1565 unsigned int flags)
1566{
1567 struct lttng_metadata_stream *stream = in->private_data;
a2a1b5ab 1568 struct lttng_kernel_ring_buffer *buf = stream->priv;
d83004aa
JD		 1569
1570 return lib_ring_buffer_splice_read(in, ppos, pipe, len,
1571 flags, buf);
1572}
1573
1574static
1575int lttng_metadata_ring_buffer_mmap(struct file *filp,
1576 struct vm_area_struct *vma)
1577{
1578 struct lttng_metadata_stream *stream = filp->private_data;
a2a1b5ab 1579 struct lttng_kernel_ring_buffer *buf = stream->priv;
d83004aa
JD		 1580
1581 return lib_ring_buffer_mmap(filp, vma, buf);
1582}
1583
1584static
1585const struct file_operations lttng_metadata_ring_buffer_file_operations = {
1586 .owner = THIS_MODULE,
1587 .open = lttng_metadata_ring_buffer_open,
1588 .release = lttng_metadata_ring_buffer_release,
1589 .poll = lttng_metadata_ring_buffer_poll,
1590 .splice_read = lttng_metadata_ring_buffer_splice_read,
1591 .mmap = lttng_metadata_ring_buffer_mmap,
1592 .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl,
1593 .llseek = vfs_lib_ring_buffer_no_llseek,
1594#ifdef CONFIG_COMPAT
1595 .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl,
1596#endif
1597};
1598
1599static
1600int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
a3fcd499 1601 const struct file_operations *fops, const char *name)
ad1c05e1 1602{
ad1c05e1 1603 int stream_fd, ret;
11b5a3c2 1604 struct file *stream_file;
ad1c05e1 1605
4ac10b76 1606 stream_fd = lttng_get_unused_fd();
ad1c05e1
MD		 1607 if (stream_fd < 0) {
1608 ret = stream_fd;
1609 goto fd_error;
1610 }
a3fcd499 1611 stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR);
c0e31d2e
MD		 1612 if (IS_ERR(stream_file)) {
1613 ret = PTR_ERR(stream_file);
ad1c05e1
MD		 1614 goto file_error;
1615 }
409453cb
MD		 1616 /*
1617 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
1618 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
1619 * file descriptor, so we set FMODE_PREAD here.
1620 */
d7b6f197 1621 stream_file->f_mode |= FMODE_PREAD;
c0e31d2e 1622 fd_install(stream_fd, stream_file);
dda6a249
MD		 1623 /*
1624 * The stream holds a reference to the channel within the generic ring
1625 * buffer library, so no need to hold a refcount on the channel and
1626 * session files here.
1627 */
ad1c05e1
MD		 1628 return stream_fd;
1629
1630file_error:
1631 put_unused_fd(stream_fd);
d83004aa
JD		 1632fd_error:
1633 return ret;
1634}
1635
1636static
1637int lttng_abi_open_stream(struct file *channel_file)
1638{
ac847066 1639 struct lttng_kernel_channel_buffer *channel = channel_file->private_data;
a2a1b5ab 1640 struct lttng_kernel_ring_buffer *buf;
d83004aa
JD		 1641 int ret;
1642 void *stream_priv;
1643
ac847066 1644 buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan);
d83004aa
JD		 1645 if (!buf)
1646 return -ENOENT;
1647
1648 stream_priv = buf;
1649 ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
a3fcd499
MD		 1650 &lttng_stream_ring_buffer_file_operations,
1651 "[lttng_stream]");
d83004aa
JD		 1652 if (ret < 0)
1653 goto fd_error;
1654
1655 return ret;
1656
1657fd_error:
da1fe18f 1658 channel->ops->priv->buffer_read_close(buf);
d83004aa
JD		 1659 return ret;
1660}
1661
1662static
1663int lttng_abi_open_metadata_stream(struct file *channel_file)
1664{
ac847066
MD		 1665 struct lttng_kernel_channel_buffer *channel = channel_file->private_data;
1666 struct lttng_kernel_session *session = channel->parent.session;
a2a1b5ab 1667 struct lttng_kernel_ring_buffer *buf;
d83004aa
JD		 1668 int ret;
1669 struct lttng_metadata_stream *metadata_stream;
1670 void *stream_priv;
1671
ac847066 1672 buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan);
d83004aa
JD		 1673 if (!buf)
1674 return -ENOENT;
1675
1676 metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream),
1677 GFP_KERNEL);
b3b8072b
MD		 1678 if (!metadata_stream) {
1679 ret = -ENOMEM;
1680 goto nomem;
1681 }
a40e3229 1682 metadata_stream->metadata_cache = session->priv->metadata_cache;
d83004aa
JD		 1683 init_waitqueue_head(&metadata_stream->read_wait);
1684 metadata_stream->priv = buf;
1685 stream_priv = metadata_stream;
ac847066 1686 metadata_stream->transport = channel->priv->transport;
8b97fd42
MD		 1687 /* Initial state is an empty metadata, considered as incoherent. */
1688 metadata_stream->coherent = false;
b3b8072b
MD		 1689
1690 /*
1691 * Since life-time of metadata cache differs from that of
1692 * session, we need to keep our own reference on the transport.
1693 */
1694 if (!try_module_get(metadata_stream->transport->owner)) {
5a15f70c 1695 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
b3b8072b
MD		 1696 ret = -EINVAL;
1697 goto notransport;
1698 }
1699
a40e3229 1700 if (!lttng_kref_get(&session->priv->metadata_cache->refcount)) {
901aaa5f 1701 ret = -EOVERFLOW;
9c1f4643 1702 goto kref_error;
901aaa5f
FD		 1703 }
1704
d83004aa 1705 ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
a3fcd499
MD		 1706 &lttng_metadata_ring_buffer_file_operations,
1707 "[lttng_metadata_stream]");
d83004aa
JD		 1708 if (ret < 0)
1709 goto fd_error;
1710
a40e3229 1711 mutex_lock(&session->priv->metadata_cache->lock);
d83004aa 1712 list_add(&metadata_stream->list,
a40e3229
MD		 1713 &session->priv->metadata_cache->metadata_stream);
1714 mutex_unlock(&session->priv->metadata_cache->lock);
d83004aa
JD		 1715 return ret;
1716
ad1c05e1 1717fd_error:
a40e3229 1718 kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
9c1f4643 1719kref_error:
b3b8072b
MD		 1720 module_put(metadata_stream->transport->owner);
1721notransport:
1722 kfree(metadata_stream);
1723nomem:
da1fe18f 1724 channel->ops->priv->buffer_read_close(buf);
ad1c05e1
MD		 1725 return ret;
1726}
1727
21f58fb7
FD		 1728static
1729int lttng_abi_open_event_notifier_group_stream(struct file *notif_file)
1730{
1731 struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data;
4071a628 1732 struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan;
a2a1b5ab 1733 struct lttng_kernel_ring_buffer *buf;
21f58fb7
FD		 1734 int ret;
1735 void *stream_priv;
1736
da1fe18f 1737 buf = event_notifier_group->ops->priv->buffer_read_open(chan);
21f58fb7
FD		 1738 if (!buf)
1739 return -ENOENT;
1740
1741 /* The event_notifier notification fd holds a reference on the event_notifier group */
1742 if (!atomic_long_add_unless(&notif_file->f_count, 1, LONG_MAX)) {
1743 ret = -EOVERFLOW;
1744 goto refcount_error;
1745 }
1746 event_notifier_group->buf = buf;
1747 stream_priv = event_notifier_group;
1748 ret = lttng_abi_create_stream_fd(notif_file, stream_priv,
1749 &lttng_event_notifier_group_notif_fops,
1750 "[lttng_event_notifier_stream]");
1751 if (ret < 0)
1752 goto fd_error;
1753
1754 return ret;
1755
1756fd_error:
1757 atomic_long_dec(&notif_file->f_count);
1758refcount_error:
da1fe18f 1759 event_notifier_group->ops->priv->buffer_read_close(buf);
21f58fb7
FD		 1760 return ret;
1761}
1762
badfe9f5 1763static
606828e4 1764int lttng_abi_validate_event_param(struct lttng_kernel_abi_event *event_param)
badfe9f5
MD		 1765{
1766 /* Limit ABI to implemented features. */
1767 switch (event_param->instrumentation) {
606828e4 1768 case LTTNG_KERNEL_ABI_SYSCALL:
badfe9f5 1769 switch (event_param->u.syscall.entryexit) {
c570be0d
MJ		 1770 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1771 lttng_fallthrough;
1772 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1773 lttng_fallthrough;
606828e4 1774 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
badfe9f5
MD		 1775 break;
1776 default:
1777 return -EINVAL;
1778 }
1779 switch (event_param->u.syscall.abi) {
606828e4 1780 case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
badfe9f5
MD		 1781 break;
1782 default:
1783 return -EINVAL;
1784 }
1785 switch (event_param->u.syscall.match) {
606828e4 1786 case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
badfe9f5
MD		 1787 break;
1788 default:
1789 return -EINVAL;
1790 }
1791 break;
1792
606828e4 1793 case LTTNG_KERNEL_ABI_KRETPROBE:
88a82b17 1794 switch (event_param->u.kretprobe.entryexit) {
606828e4 1795 case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
88a82b17 1796 break;
c570be0d
MJ		 1797 case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
1798 lttng_fallthrough;
1799 case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
1800 lttng_fallthrough;
88a82b17
MD		 1801 default:
1802 return -EINVAL;
1803 }
1804 break;
1805
c570be0d
MJ		 1806 case LTTNG_KERNEL_ABI_TRACEPOINT:
1807 lttng_fallthrough;
1808 case LTTNG_KERNEL_ABI_KPROBE:
1809 lttng_fallthrough;
606828e4 1810 case LTTNG_KERNEL_ABI_UPROBE:
badfe9f5
MD		 1811 break;
1812
c570be0d
MJ		 1813 case LTTNG_KERNEL_ABI_FUNCTION:
1814 lttng_fallthrough;
1815 case LTTNG_KERNEL_ABI_NOOP:
1816 lttng_fallthrough;
badfe9f5
MD		 1817 default:
1818 return -EINVAL;
1819 }
1820 return 0;
1821}
1822
653fe716 1823static
c0e31d2e 1824int lttng_abi_create_event(struct file *channel_file,
606828e4 1825 struct lttng_kernel_abi_event *event_param)
653fe716 1826{
ef784b4d 1827 const struct file_operations *fops;
ac847066 1828 struct lttng_kernel_channel_buffer *channel = channel_file->private_data;
653fe716 1829 int event_fd, ret;
11b5a3c2 1830 struct file *event_file;
3c997079 1831 void *priv;
653fe716 1832
606828e4 1833 event_param->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
6dccd6c1 1834 switch (event_param->instrumentation) {
606828e4
MD		 1835 case LTTNG_KERNEL_ABI_KRETPROBE:
1836 event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
7371f44c 1837 break;
606828e4
MD		 1838 case LTTNG_KERNEL_ABI_KPROBE:
1839 event_param->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
e0a7a7c4 1840 break;
606828e4 1841 case LTTNG_KERNEL_ABI_FUNCTION:
e884017c
MD		 1842 WARN_ON_ONCE(1);
1843 /* Not implemented. */
e0a7a7c4
MD		 1844 break;
1845 default:
1846 break;
1847 }
ef784b4d
MD		 1848
1849 switch (event_param->instrumentation) {
c570be0d
MJ		 1850 case LTTNG_KERNEL_ABI_TRACEPOINT:
1851 lttng_fallthrough;
ef784b4d
MD		 1852 case LTTNG_KERNEL_ABI_SYSCALL:
1853 fops = &lttng_event_recorder_enabler_fops;
1854 break;
c570be0d
MJ		 1855 case LTTNG_KERNEL_ABI_KPROBE:
1856 lttng_fallthrough;
1857 case LTTNG_KERNEL_ABI_KRETPROBE:
1858 lttng_fallthrough;
ef784b4d
MD		 1859 case LTTNG_KERNEL_ABI_UPROBE:
1860 fops = &lttng_event_recorder_event_fops;
1861 break;
1862
c570be0d
MJ		 1863 case LTTNG_KERNEL_ABI_FUNCTION:
1864 lttng_fallthrough;
1865 case LTTNG_KERNEL_ABI_NOOP:
1866 lttng_fallthrough;
ef784b4d
MD		 1867 default:
1868 return -EINVAL;
1869 }
1870
33a39a3c
MD		 1871 event_fd = lttng_get_unused_fd();
1872 if (event_fd < 0) {
1873 ret = event_fd;
1874 goto fd_error;
1875 }
1876 event_file = anon_inode_getfile("[lttng_event]",
ef784b4d 1877 fops, NULL, O_RDWR);
33a39a3c
MD		 1878 if (IS_ERR(event_file)) {
1879 ret = PTR_ERR(event_file);
1880 goto file_error;
1881 }
9c1f4643 1882 /* The event holds a reference on the channel */
98d7281c 1883 if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) {
0d2c717f 1884 ret = -EOVERFLOW;
9c1f4643
MD		 1885 goto refcount_error;
1886 }
badfe9f5
MD		 1887 ret = lttng_abi_validate_event_param(event_param);
1888 if (ret)
1889 goto event_error;
684a1e4d
MD		 1890
1891 switch (event_param->instrumentation) {
c570be0d
MJ		 1892 case LTTNG_KERNEL_ABI_TRACEPOINT:
1893 lttng_fallthrough;
606828e4 1894 case LTTNG_KERNEL_ABI_SYSCALL:
684a1e4d 1895 {
b2bc0bc8 1896 struct lttng_event_enabler *event_enabler;
33a39a3c 1897
4993071a
PP		 1898 if (strutils_is_star_glob_pattern(event_param->name)) {
1899 /*
1900 * If the event name is a star globbing pattern,
1901 * we create the special star globbing enabler.
1902 */
b2bc0bc8 1903 event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB,
33a39a3c 1904 event_param, channel);
3c997079 1905 } else {
b2bc0bc8 1906 event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
33a39a3c 1907 event_param, channel);
1ec65de1 1908 }
b2bc0bc8 1909 priv = event_enabler;
684a1e4d
MD		 1910 break;
1911 }
1912
c570be0d
MJ		 1913 case LTTNG_KERNEL_ABI_KPROBE:
1914 lttng_fallthrough;
1915 case LTTNG_KERNEL_ABI_KRETPROBE:
1916 lttng_fallthrough;
606828e4 1917 case LTTNG_KERNEL_ABI_UPROBE:
684a1e4d 1918 {
a67ba386 1919 struct lttng_kernel_event_recorder *event;
4ee2453d 1920
33a39a3c
MD		 1921 /*
1922 * We tolerate no failure path after event creation. It
1923 * will stay invariant for the rest of the session.
1924 */
a67ba386
MD		 1925 event = lttng_kernel_event_recorder_create(channel, event_param,
1926 NULL, event_param->instrumentation);
33a39a3c
MD		 1927 WARN_ON_ONCE(!event);
1928 if (IS_ERR(event)) {
1929 ret = PTR_ERR(event);
1930 goto event_error;
80f87dd2 1931 }
33a39a3c 1932 priv = event;
684a1e4d
MD		 1933 break;
1934 }
1935
c570be0d
MJ		 1936 case LTTNG_KERNEL_ABI_FUNCTION:
1937 lttng_fallthrough;
1938 case LTTNG_KERNEL_ABI_NOOP:
1939 lttng_fallthrough;
684a1e4d
MD		 1940 default:
1941 ret = -EINVAL;
1942 goto event_error;
03037b98 1943 }
33a39a3c
MD		 1944 event_file->private_data = priv;
1945 fd_install(event_fd, event_file);
653fe716
MD		 1946 return event_fd;
1947
03037b98 1948event_error:
9c1f4643
MD		 1949 atomic_long_dec(&channel_file->f_count);
1950refcount_error:
c0e31d2e 1951 fput(event_file);
653fe716
MD		 1952file_error:
1953 put_unused_fd(event_fd);
1954fd_error:
653fe716
MD		 1955 return ret;
1956}
ad1c05e1 1957
dffef45d 1958static
ef784b4d 1959long lttng_event_notifier_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
dffef45d 1960{
a67ba386 1961 struct lttng_kernel_event_notifier *event_notifier = file->private_data;
dffef45d
FD		 1962
1963 switch (cmd) {
606828e4 1964 case LTTNG_KERNEL_ABI_ENABLE:
9d993668 1965 return lttng_event_enable(&event_notifier->parent);
606828e4 1966 case LTTNG_KERNEL_ABI_DISABLE:
9d993668 1967 return lttng_event_disable(&event_notifier->parent);
606828e4 1968 case LTTNG_KERNEL_ABI_FILTER:
ef784b4d 1969 return -EINVAL;
606828e4 1970 case LTTNG_KERNEL_ABI_CAPTURE:
ef784b4d 1971 return -EINVAL;
606828e4 1972 case LTTNG_KERNEL_ABI_ADD_CALLSITE:
e2d5dbc7 1973 return lttng_event_add_callsite(&event_notifier->parent,
ef784b4d 1974 (struct lttng_kernel_abi_event_callsite __user *) arg);
dffef45d
FD		 1975 default:
1976 return -ENOIOCTLCMD;
1977 }
1978}
1979
1980static
ef784b4d 1981long lttng_event_notifier_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
dffef45d 1982{
ef784b4d 1983 struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data;
dffef45d 1984
ef784b4d
MD		 1985 switch (cmd) {
1986 case LTTNG_KERNEL_ABI_ENABLE:
1987 return lttng_event_notifier_enabler_enable(event_notifier_enabler);
1988 case LTTNG_KERNEL_ABI_DISABLE:
1989 return lttng_event_notifier_enabler_disable(event_notifier_enabler);
1990 case LTTNG_KERNEL_ABI_FILTER:
1991 return lttng_event_notifier_enabler_attach_filter_bytecode(
1992 event_notifier_enabler,
1993 (struct lttng_kernel_abi_filter_bytecode __user *) arg);
1994 case LTTNG_KERNEL_ABI_CAPTURE:
1995 return lttng_event_notifier_enabler_attach_capture_bytecode(
1996 event_notifier_enabler,
1997 (struct lttng_kernel_abi_capture_bytecode __user *) arg);
1998 case LTTNG_KERNEL_ABI_ADD_CALLSITE:
1999 return -EINVAL;
dffef45d 2000 default:
ef784b4d 2001 return -ENOIOCTLCMD;
dffef45d 2002 }
ef784b4d 2003}
dffef45d 2004
ef784b4d
MD		 2005static
2006int lttng_event_notifier_event_release(struct inode *inode, struct file *file)
2007{
a67ba386 2008 struct lttng_kernel_event_notifier *event_notifier = file->private_data;
ef784b4d
MD		 2009
2010 if (event_notifier)
a67ba386 2011 fput(event_notifier->priv->group->file);
dffef45d
FD		 2012 return 0;
2013}
2014
ef784b4d
MD		 2015static
2016int lttng_event_notifier_enabler_release(struct inode *inode, struct file *file)
2017{
2018 struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data;
2019
2020 if (event_notifier_enabler)
2021 fput(event_notifier_enabler->group->file);
2022 return 0;
2023}
2024
2025static const struct file_operations lttng_event_notifier_event_fops = {
2026 .owner = THIS_MODULE,
2027 .release = lttng_event_notifier_event_release,
2028 .unlocked_ioctl = lttng_event_notifier_event_ioctl,
2029#ifdef CONFIG_COMPAT
2030 .compat_ioctl = lttng_event_notifier_event_ioctl,
2031#endif
2032};
2033
2034static const struct file_operations lttng_event_notifier_enabler_fops = {
dffef45d 2035 .owner = THIS_MODULE,
ef784b4d
MD		 2036 .release = lttng_event_notifier_enabler_release,
2037 .unlocked_ioctl = lttng_event_notifier_enabler_ioctl,
dffef45d 2038#ifdef CONFIG_COMPAT
ef784b4d 2039 .compat_ioctl = lttng_event_notifier_enabler_ioctl,
dffef45d
FD		 2040#endif
2041};
2042
2043static
2044int lttng_abi_create_event_notifier(struct file *event_notifier_group_file,
606828e4 2045 struct lttng_kernel_abi_event_notifier *event_notifier_param)
dffef45d
FD		 2046{
2047 struct lttng_event_notifier_group *event_notifier_group =
2048 event_notifier_group_file->private_data;
ef784b4d 2049 const struct file_operations *fops;
dffef45d
FD		 2050 int event_notifier_fd, ret;
2051 struct file *event_notifier_file;
2052 void *priv;
2053
2054 switch (event_notifier_param->event.instrumentation) {
606828e4
MD		 2055 case LTTNG_KERNEL_ABI_TRACEPOINT:
2056 case LTTNG_KERNEL_ABI_UPROBE:
b01155ba 2057 break;
606828e4
MD		 2058 case LTTNG_KERNEL_ABI_KPROBE:
2059 event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
2b16f0c9 2060 break;
606828e4 2061 case LTTNG_KERNEL_ABI_SYSCALL:
8a8ac9a8 2062 break;
606828e4 2063 case LTTNG_KERNEL_ABI_KRETPROBE:
9de67196 2064 /* Placing an event notifier on kretprobe is not supported. */
606828e4
MD		 2065 case LTTNG_KERNEL_ABI_FUNCTION:
2066 case LTTNG_KERNEL_ABI_NOOP:
dffef45d
FD		 2067 default:
2068 ret = -EINVAL;
2069 goto inval_instr;
2070 }
2071
ef784b4d 2072 switch (event_notifier_param->event.instrumentation) {
c570be0d
MJ		 2073 case LTTNG_KERNEL_ABI_TRACEPOINT:
2074 lttng_fallthrough;
ef784b4d
MD		 2075 case LTTNG_KERNEL_ABI_SYSCALL:
2076 fops = &lttng_event_notifier_enabler_fops;
2077 break;
c570be0d
MJ		 2078 case LTTNG_KERNEL_ABI_KPROBE:
2079 lttng_fallthrough;
2080 case LTTNG_KERNEL_ABI_KRETPROBE:
2081 lttng_fallthrough;
ef784b4d
MD		 2082 case LTTNG_KERNEL_ABI_UPROBE:
2083 fops = &lttng_event_notifier_event_fops;
2084 break;
2085
c570be0d
MJ		 2086 case LTTNG_KERNEL_ABI_FUNCTION:
2087 lttng_fallthrough;
2088 case LTTNG_KERNEL_ABI_NOOP:
2089 lttng_fallthrough;
ef784b4d
MD		 2090 default:
2091 ret = -EINVAL;
2092 goto inval_instr;
2093 }
2094
606828e4 2095 event_notifier_param->event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
dffef45d
FD		 2096
2097 event_notifier_fd = lttng_get_unused_fd();
2098 if (event_notifier_fd < 0) {
2099 ret = event_notifier_fd;
2100 goto fd_error;
2101 }
2102
2103 event_notifier_file = anon_inode_getfile("[lttng_event_notifier]",
ef784b4d 2104 fops, NULL, O_RDWR);
dffef45d
FD		 2105 if (IS_ERR(event_notifier_file)) {
2106 ret = PTR_ERR(event_notifier_file);
2107 goto file_error;
2108 }
2109
2110 /* The event notifier holds a reference on the event notifier group. */
2111 if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) {
2112 ret = -EOVERFLOW;
2113 goto refcount_error;
2114 }
2115
56237619
MD		 2116 ret = lttng_abi_validate_event_param(&event_notifier_param->event);
2117 if (ret)
2118 goto event_notifier_error;
2119
684a1e4d 2120 switch (event_notifier_param->event.instrumentation) {
c570be0d
MJ		 2121 case LTTNG_KERNEL_ABI_TRACEPOINT:
2122 lttng_fallthrough;
606828e4 2123 case LTTNG_KERNEL_ABI_SYSCALL:
684a1e4d 2124 {
dffef45d
FD		 2125 struct lttng_event_notifier_enabler *enabler;
2126
2127 if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) {
2128 /*
2129 * If the event name is a star globbing pattern,
2130 * we create the special star globbing enabler.
2131 */
2132 enabler = lttng_event_notifier_enabler_create(
2133 event_notifier_group,
2134 LTTNG_ENABLER_FORMAT_STAR_GLOB,
2135 event_notifier_param);
2136 } else {
2137 enabler = lttng_event_notifier_enabler_create(
2138 event_notifier_group,
2139 LTTNG_ENABLER_FORMAT_NAME,
2140 event_notifier_param);
2141 }
2142 priv = enabler;
684a1e4d
MD		 2143 break;
2144 }
2145
c570be0d
MJ		 2146 case LTTNG_KERNEL_ABI_KPROBE:
2147 lttng_fallthrough;
2148 case LTTNG_KERNEL_ABI_KRETPROBE:
2149 lttng_fallthrough;
606828e4 2150 case LTTNG_KERNEL_ABI_UPROBE:
684a1e4d 2151 {
a67ba386 2152 struct lttng_kernel_event_notifier *event_notifier;
dffef45d
FD		 2153
2154 /*
2155 * We tolerate no failure path after event notifier creation.
2156 * It will stay invariant for the rest of the session.
2157 */
2158 event_notifier = lttng_event_notifier_create(NULL,
99f52fcc
FD		 2159 event_notifier_param->event.token,
2160 event_notifier_param->error_counter_index,
2161 event_notifier_group,
a67ba386 2162 event_notifier_param,
dffef45d
FD		 2163 event_notifier_param->event.instrumentation);
2164 WARN_ON_ONCE(!event_notifier);
2165 if (IS_ERR(event_notifier)) {
2166 ret = PTR_ERR(event_notifier);
2167 goto event_notifier_error;
2168 }
2169 priv = event_notifier;
684a1e4d
MD		 2170 break;
2171 }
2172
c570be0d
MJ		 2173 case LTTNG_KERNEL_ABI_FUNCTION:
2174 lttng_fallthrough;
2175 case LTTNG_KERNEL_ABI_NOOP:
2176 lttng_fallthrough;
684a1e4d
MD		 2177 default:
2178 ret = -EINVAL;
2179 goto event_notifier_error;
dffef45d
FD		 2180 }
2181 event_notifier_file->private_data = priv;
2182 fd_install(event_notifier_fd, event_notifier_file);
2183 return event_notifier_fd;
2184
2185event_notifier_error:
2186 atomic_long_dec(&event_notifier_group_file->f_count);
2187refcount_error:
2188 fput(event_notifier_file);
2189file_error:
2190 put_unused_fd(event_notifier_fd);
2191fd_error:
2192inval_instr:
2193 return ret;
2194}
2195
99f52fcc
FD		 2196static
2197long lttng_abi_event_notifier_group_create_error_counter(
2198 struct file *event_notifier_group_file,
606828e4 2199 const struct lttng_kernel_abi_counter_conf *error_counter_conf)
99f52fcc
FD		 2200{
2201 int counter_fd, ret;
2202 char *counter_transport_name;
2203 size_t counter_len;
2204 struct lttng_counter *counter = NULL;
2205 struct file *counter_file;
2206 struct lttng_event_notifier_group *event_notifier_group =
2207 (struct lttng_event_notifier_group *) event_notifier_group_file->private_data;
2208
606828e4 2209 if (error_counter_conf->arithmetic != LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR) {
99f52fcc
FD		 2210 printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n");
2211 return -EINVAL;
2212 }
2213
2214 if (error_counter_conf->number_dimensions != 1) {
2215 printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n");
2216 return -EINVAL;
2217 }
2218
2219 switch (error_counter_conf->bitness) {
606828e4 2220 case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64:
99f52fcc
FD		 2221 counter_transport_name = "counter-per-cpu-64-modular";
2222 break;
606828e4 2223 case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32:
99f52fcc
FD		 2224 counter_transport_name = "counter-per-cpu-32-modular";
2225 break;
2226 default:
2227 return -EINVAL;
2228 }
2229
2230 /*
2231 * Lock sessions to provide mutual exclusion against concurrent
2232 * modification of event_notifier group, which would result in
2233 * overwriting the error counter if set concurrently.
2234 */
2235 lttng_lock_sessions();
2236
2237 if (event_notifier_group->error_counter) {
2238 printk(KERN_ERR "Error counter already created in event_notifier group\n");
2239 ret = -EBUSY;
2240 goto fd_error;
2241 }
2242
2243 counter_fd = lttng_get_unused_fd();
2244 if (counter_fd < 0) {
2245 ret = counter_fd;
2246 goto fd_error;
2247 }
2248
2249 counter_file = anon_inode_getfile("[lttng_counter]",
2250 &lttng_counter_fops,
2251 NULL, O_RDONLY);
2252 if (IS_ERR(counter_file)) {
2253 ret = PTR_ERR(counter_file);
2254 goto file_error;
2255 }
2256
2257 counter_len = error_counter_conf->dimensions[0].size;
2258
2259 if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) {
2260 ret = -EOVERFLOW;
2261 goto refcount_error;
2262 }
2263
2264 counter = lttng_kernel_counter_create(counter_transport_name,
2265 1, &counter_len);
2266 if (!counter) {
2267 ret = -EINVAL;
2268 goto counter_error;
2269 }
2270
99f52fcc 2271 event_notifier_group->error_counter_len = counter_len;
ab04d7b1
MD		 2272 /*
2273 * store-release to publish error counter matches load-acquire
2274 * in record_error. Ensures the counter is created and the
2275 * error_counter_len is set before they are used.
2276 */
6657edec 2277 lttng_smp_store_release(&event_notifier_group->error_counter, counter);
99f52fcc
FD		 2278
2279 counter->file = counter_file;
2280 counter->owner = event_notifier_group->file;
2281 counter_file->private_data = counter;
2282 /* Ownership transferred. */
2283 counter = NULL;
2284
2285 fd_install(counter_fd, counter_file);
2286 lttng_unlock_sessions();
2287
2288 return counter_fd;
2289
2290counter_error:
2291 atomic_long_dec(&event_notifier_group_file->f_count);
2292refcount_error:
2293 fput(counter_file);
2294file_error:
2295 put_unused_fd(counter_fd);
2296fd_error:
2297 lttng_unlock_sessions();
2298 return ret;
2299}
2300
750b05f2
FD		 2301static
2302long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd,
2303 unsigned long arg)
2304{
2305 switch (cmd) {
606828e4 2306 case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD:
21f58fb7
FD		 2307 {
2308 return lttng_abi_open_event_notifier_group_stream(file);
2309 }
606828e4 2310 case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE:
dffef45d 2311 {
606828e4 2312 struct lttng_kernel_abi_event_notifier uevent_notifier_param;
dffef45d
FD		 2313
2314 if (copy_from_user(&uevent_notifier_param,
606828e4 2315 (struct lttng_kernel_abi_event_notifier __user *) arg,
dffef45d
FD		 2316 sizeof(uevent_notifier_param)))
2317 return -EFAULT;
2318 return lttng_abi_create_event_notifier(file, &uevent_notifier_param);
2319 }
606828e4 2320 case LTTNG_KERNEL_ABI_COUNTER:
99f52fcc 2321 {
606828e4 2322 struct lttng_kernel_abi_counter_conf uerror_counter_conf;
99f52fcc
FD		 2323
2324 if (copy_from_user(&uerror_counter_conf,
606828e4 2325 (struct lttng_kernel_abi_counter_conf __user *) arg,
99f52fcc
FD		 2326 sizeof(uerror_counter_conf)))
2327 return -EFAULT;
2328 return lttng_abi_event_notifier_group_create_error_counter(file,
2329 &uerror_counter_conf);
2330 }
750b05f2
FD		 2331 default:
2332 return -ENOIOCTLCMD;
2333 }
2334 return 0;
2335}
2336
2337static
2338int lttng_event_notifier_group_release(struct inode *inode, struct file *file)
2339{
2340 struct lttng_event_notifier_group *event_notifier_group =
2341 file->private_data;
2342
2343 if (event_notifier_group)
2344 lttng_event_notifier_group_destroy(event_notifier_group);
2345 return 0;
2346}
2347
2348static const struct file_operations lttng_event_notifier_group_fops = {
2349 .owner = THIS_MODULE,
2350 .release = lttng_event_notifier_group_release,
2351 .unlocked_ioctl = lttng_event_notifier_group_ioctl,
2352#ifdef CONFIG_COMPAT
2353 .compat_ioctl = lttng_event_notifier_group_ioctl,
2354#endif
2355};
2356
ad1c05e1
MD		 2357/**
2358 * lttng_channel_ioctl - lttng syscall through ioctl
2359 *
c0e31d2e 2360 * @file: the file
ad1c05e1
MD		 2361 * @cmd: the command
2362 * @arg: command arg
2363 *
2364 * This ioctl implements lttng commands:
606828e4 2365 * LTTNG_KERNEL_ABI_STREAM
ad1c05e1
MD		 2366 * Returns an event stream file descriptor or failure.
2367 * (typically, one event stream records events from one CPU)
606828e4 2368 * LTTNG_KERNEL_ABI_EVENT
ad1c05e1 2369 * Returns an event file descriptor or failure.
606828e4 2370 * LTTNG_KERNEL_ABI_CONTEXT
8070f5c0 2371 * Prepend a context field to each event in the channel
606828e4 2372 * LTTNG_KERNEL_ABI_ENABLE
e64957da 2373 * Enable recording for events in this channel (weak enable)
606828e4 2374 * LTTNG_KERNEL_ABI_DISABLE
e64957da 2375 * Disable recording for events in this channel (strong disable)
baf20995 2376 *
baf20995
MD		 2377 * Channel and event file descriptors also hold a reference on the session.
2378 */
ad1c05e1 2379static
c0e31d2e 2380long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
baf20995 2381{
ac847066 2382 struct lttng_kernel_channel_buffer *channel = file->private_data;
8070f5c0 2383
baf20995 2384 switch (cmd) {
606828e4
MD		 2385 case LTTNG_KERNEL_ABI_OLD_STREAM:
2386 case LTTNG_KERNEL_ABI_STREAM:
c0e31d2e 2387 return lttng_abi_open_stream(file);
606828e4 2388 case LTTNG_KERNEL_ABI_OLD_EVENT:
6dccd6c1 2389 {
606828e4
MD		 2390 struct lttng_kernel_abi_event *uevent_param;
2391 struct lttng_kernel_abi_old_event *old_uevent_param;
6dccd6c1
JD		 2392 int ret;
2393
606828e4 2394 uevent_param = kmalloc(sizeof(struct lttng_kernel_abi_event),
6dccd6c1
JD		 2395 GFP_KERNEL);
2396 if (!uevent_param) {
2397 ret = -ENOMEM;
2398 goto old_event_end;
2399 }
2400 old_uevent_param = kmalloc(
606828e4 2401 sizeof(struct lttng_kernel_abi_old_event),
6dccd6c1
JD		 2402 GFP_KERNEL);
2403 if (!old_uevent_param) {
2404 ret = -ENOMEM;
2405 goto old_event_error_free_param;
2406 }
2407 if (copy_from_user(old_uevent_param,
606828e4
MD		 2408 (struct lttng_kernel_abi_old_event __user *) arg,
2409 sizeof(struct lttng_kernel_abi_old_event))) {
6dccd6c1
JD		 2410 ret = -EFAULT;
2411 goto old_event_error_free_old_param;
2412 }
2413
2414 memcpy(uevent_param->name, old_uevent_param->name,
2415 sizeof(uevent_param->name));
2416 uevent_param->instrumentation =
2417 old_uevent_param->instrumentation;
2418
2419 switch (old_uevent_param->instrumentation) {
606828e4 2420 case LTTNG_KERNEL_ABI_KPROBE:
6dccd6c1
JD		 2421 uevent_param->u.kprobe.addr =
2422 old_uevent_param->u.kprobe.addr;
2423 uevent_param->u.kprobe.offset =
2424 old_uevent_param->u.kprobe.offset;
2425 memcpy(uevent_param->u.kprobe.symbol_name,
2426 old_uevent_param->u.kprobe.symbol_name,
2427 sizeof(uevent_param->u.kprobe.symbol_name));
2428 break;
606828e4 2429 case LTTNG_KERNEL_ABI_KRETPROBE:
6dccd6c1
JD		 2430 uevent_param->u.kretprobe.addr =
2431 old_uevent_param->u.kretprobe.addr;
2432 uevent_param->u.kretprobe.offset =
2433 old_uevent_param->u.kretprobe.offset;
2434 memcpy(uevent_param->u.kretprobe.symbol_name,
2435 old_uevent_param->u.kretprobe.symbol_name,
2436 sizeof(uevent_param->u.kretprobe.symbol_name));
2437 break;
606828e4 2438 case LTTNG_KERNEL_ABI_FUNCTION:
e884017c
MD		 2439 WARN_ON_ONCE(1);
2440 /* Not implemented. */
6dccd6c1
JD		 2441 break;
2442 default:
2443 break;
2444 }
2445 ret = lttng_abi_create_event(file, uevent_param);
2446
2447old_event_error_free_old_param:
2448 kfree(old_uevent_param);
2449old_event_error_free_param:
2450 kfree(uevent_param);
2451old_event_end:
2452 return ret;
2453 }
606828e4 2454 case LTTNG_KERNEL_ABI_EVENT:
6dccd6c1 2455 {
606828e4 2456 struct lttng_kernel_abi_event uevent_param;
6dccd6c1
JD		 2457
2458 if (copy_from_user(&uevent_param,
606828e4 2459 (struct lttng_kernel_abi_event __user *) arg,
6dccd6c1
JD		 2460 sizeof(uevent_param)))
2461 return -EFAULT;
2462 return lttng_abi_create_event(file, &uevent_param);
2463 }
606828e4 2464 case LTTNG_KERNEL_ABI_OLD_CONTEXT:
6dccd6c1 2465 {
606828e4
MD		 2466 struct lttng_kernel_abi_context *ucontext_param;
2467 struct lttng_kernel_abi_old_context *old_ucontext_param;
6dccd6c1
JD		 2468 int ret;
2469
606828e4 2470 ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_context),
6dccd6c1
JD		 2471 GFP_KERNEL);
2472 if (!ucontext_param) {
2473 ret = -ENOMEM;
2474 goto old_ctx_end;
2475 }
606828e4 2476 old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_old_context),
6dccd6c1
JD		 2477 GFP_KERNEL);
2478 if (!old_ucontext_param) {
2479 ret = -ENOMEM;
2480 goto old_ctx_error_free_param;
2481 }
2482
2483 if (copy_from_user(old_ucontext_param,
606828e4
MD		 2484 (struct lttng_kernel_abi_old_context __user *) arg,
2485 sizeof(struct lttng_kernel_abi_old_context))) {
6dccd6c1
JD		 2486 ret = -EFAULT;
2487 goto old_ctx_error_free_old_param;
2488 }
2489 ucontext_param->ctx = old_ucontext_param->ctx;
2490 memcpy(ucontext_param->padding, old_ucontext_param->padding,
2491 sizeof(ucontext_param->padding));
2492 /* only type that uses the union */
606828e4 2493 if (old_ucontext_param->ctx == LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER) {
6dccd6c1
JD		 2494 ucontext_param->u.perf_counter.type =
2495 old_ucontext_param->u.perf_counter.type;
2496 ucontext_param->u.perf_counter.config =
2497 old_ucontext_param->u.perf_counter.config;
2498 memcpy(ucontext_param->u.perf_counter.name,
2499 old_ucontext_param->u.perf_counter.name,
2500 sizeof(ucontext_param->u.perf_counter.name));
2501 }
2502
2503 ret = lttng_abi_add_context(file,
2504 ucontext_param,
ac847066 2505 &channel->priv->ctx, channel->parent.session);
6dccd6c1
JD		 2506
2507old_ctx_error_free_old_param:
2508 kfree(old_ucontext_param);
2509old_ctx_error_free_param:
2510 kfree(ucontext_param);
2511old_ctx_end:
2512 return ret;
2513 }
606828e4 2514 case LTTNG_KERNEL_ABI_CONTEXT:
6dccd6c1 2515 {
606828e4 2516 struct lttng_kernel_abi_context ucontext_param;
6dccd6c1
JD		 2517
2518 if (copy_from_user(&ucontext_param,
606828e4 2519 (struct lttng_kernel_abi_context __user *) arg,
6dccd6c1
JD		 2520 sizeof(ucontext_param)))
2521 return -EFAULT;
2522 return lttng_abi_add_context(file,
2523 &ucontext_param,
ac847066 2524 &channel->priv->ctx, channel->parent.session);
6dccd6c1 2525 }
606828e4
MD		 2526 case LTTNG_KERNEL_ABI_OLD_ENABLE:
2527 case LTTNG_KERNEL_ABI_ENABLE:
a90917c3 2528 return lttng_channel_enable(channel);
606828e4
MD		 2529 case LTTNG_KERNEL_ABI_OLD_DISABLE:
2530 case LTTNG_KERNEL_ABI_DISABLE:
a90917c3 2531 return lttng_channel_disable(channel);
606828e4 2532 case LTTNG_KERNEL_ABI_SYSCALL_MASK:
12e579db 2533 return lttng_channel_syscall_mask(channel,
606828e4 2534 (struct lttng_kernel_abi_syscall_mask __user *) arg);
baf20995
MD		 2535 default:
2536 return -ENOIOCTLCMD;
2537 }
2538}
2539
5dbbdb43
MD		 2540/**
2541 * lttng_metadata_ioctl - lttng syscall through ioctl
2542 *
2543 * @file: the file
2544 * @cmd: the command
2545 * @arg: command arg
2546 *
2547 * This ioctl implements lttng commands:
606828e4 2548 * LTTNG_KERNEL_ABI_STREAM
5dbbdb43
MD		 2549 * Returns an event stream file descriptor or failure.
2550 *
2551 * Channel and event file descriptors also hold a reference on the session.
2552 */
2553static
2554long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2555{
2556 switch (cmd) {
606828e4
MD		 2557 case LTTNG_KERNEL_ABI_OLD_STREAM:
2558 case LTTNG_KERNEL_ABI_STREAM:
d83004aa 2559 return lttng_abi_open_metadata_stream(file);
5dbbdb43
MD		 2560 default:
2561 return -ENOIOCTLCMD;
2562 }
2563}
2564
653fe716
MD		 2565/**
2566 * lttng_channel_poll - lttng stream addition/removal monitoring
2567 *
c0e31d2e 2568 * @file: the file
653fe716
MD		 2569 * @wait: poll table
2570 */
c0e31d2e 2571unsigned int lttng_channel_poll(struct file *file, poll_table *wait)
653fe716 2572{
ac847066 2573 struct lttng_kernel_channel_buffer *channel = file->private_data;
653fe716
MD		 2574 unsigned int mask = 0;
2575
c0e31d2e 2576 if (file->f_mode & FMODE_READ) {
a33e44a6 2577 poll_wait_set_exclusive(wait);
ac847066 2578 poll_wait(file, channel->ops->priv->get_hp_wait_queue(channel->priv->rb_chan),
24cedcfe 2579 wait);
653fe716 2580
ac847066 2581 if (channel->ops->priv->is_disabled(channel->priv->rb_chan))
254ec7bc 2582 return POLLERR;
ac847066 2583 if (channel->ops->priv->is_finalized(channel->priv->rb_chan))
653fe716 2584 return POLLHUP;
ac847066 2585 if (channel->ops->priv->buffer_has_read_closed_stream(channel->priv->rb_chan))
653fe716 2586 return POLLIN | POLLRDNORM;
f71ecafa 2587 return 0;
653fe716
MD		 2588 }
2589 return mask;
2590
2591}
2592
0a84a57f
MD		 2593static
2594int lttng_channel_release(struct inode *inode, struct file *file)
2595{
ac847066 2596 struct lttng_kernel_channel_buffer *channel = file->private_data;
c269fff4
MD		 2597
2598 if (channel)
ac847066 2599 fput(channel->parent.session->priv->file);
0a84a57f
MD		 2600 return 0;
2601}
2602
d83004aa
JD		 2603static
2604int lttng_metadata_channel_release(struct inode *inode, struct file *file)
2605{
ac847066 2606 struct lttng_kernel_channel_buffer *channel = file->private_data;
d83004aa
JD		 2607
2608 if (channel) {
ac847066 2609 fput(channel->parent.session->priv->file);
a3381417 2610 lttng_metadata_channel_destroy(channel);
d83004aa
JD		 2611 }
2612
2613 return 0;
2614}
2615
ad1c05e1 2616static const struct file_operations lttng_channel_fops = {
a33c9927 2617 .owner = THIS_MODULE,
03037b98 2618 .release = lttng_channel_release,
653fe716 2619 .poll = lttng_channel_poll,
ad1c05e1 2620 .unlocked_ioctl = lttng_channel_ioctl,
baf20995 2621#ifdef CONFIG_COMPAT
03037b98 2622 .compat_ioctl = lttng_channel_ioctl,
baf20995 2623#endif
11b5a3c2 2624};
baf20995 2625
5dbbdb43 2626static const struct file_operations lttng_metadata_fops = {
a33c9927 2627 .owner = THIS_MODULE,
d83004aa 2628 .release = lttng_metadata_channel_release,
5dbbdb43
MD		 2629 .unlocked_ioctl = lttng_metadata_ioctl,
2630#ifdef CONFIG_COMPAT
2631 .compat_ioctl = lttng_metadata_ioctl,
2632#endif
2633};
2634
8070f5c0 2635/**
ef784b4d 2636 * lttng_event_recorder_event_ioctl - lttng syscall through ioctl
8070f5c0
MD		 2637 *
2638 * @file: the file
2639 * @cmd: the command
2640 * @arg: command arg
2641 *
2642 * This ioctl implements lttng commands:
606828e4 2643 * LTTNG_KERNEL_ABI_CONTEXT
8070f5c0 2644 * Prepend a context field to each record of this event
606828e4 2645 * LTTNG_KERNEL_ABI_ENABLE
e64957da 2646 * Enable recording for this event (weak enable)
606828e4 2647 * LTTNG_KERNEL_ABI_DISABLE
e64957da 2648 * Disable recording for this event (strong disable)
8070f5c0
MD		 2649 */
2650static
ef784b4d 2651long lttng_event_recorder_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
8070f5c0 2652{
e2d5dbc7 2653 struct lttng_kernel_event_recorder *event_recorder = file->private_data;
8070f5c0
MD		 2654
2655 switch (cmd) {
606828e4 2656 case LTTNG_KERNEL_ABI_OLD_CONTEXT:
6dccd6c1 2657 {
3c997079
MD		 2658 /* Not implemented */
2659 return -ENOSYS;
6dccd6c1 2660 }
606828e4 2661 case LTTNG_KERNEL_ABI_CONTEXT:
6dccd6c1 2662 {
3c997079
MD		 2663 /* Not implemented */
2664 return -ENOSYS;
6dccd6c1 2665 }
606828e4
MD		 2666 case LTTNG_KERNEL_ABI_OLD_ENABLE:
2667 case LTTNG_KERNEL_ABI_ENABLE:
9d993668 2668 return lttng_event_enable(&event_recorder->parent);
606828e4
MD		 2669 case LTTNG_KERNEL_ABI_OLD_DISABLE:
2670 case LTTNG_KERNEL_ABI_DISABLE:
9d993668 2671 return lttng_event_disable(&event_recorder->parent);
606828e4 2672 case LTTNG_KERNEL_ABI_FILTER:
ef784b4d 2673 return -EINVAL;
606828e4 2674 case LTTNG_KERNEL_ABI_ADD_CALLSITE:
e2d5dbc7 2675 return lttng_event_add_callsite(&event_recorder->parent,
ef784b4d 2676 (struct lttng_kernel_abi_event_callsite __user *) arg);
8070f5c0
MD		 2677 default:
2678 return -ENOIOCTLCMD;
2679 }
2680}
2681
ef784b4d
MD		 2682/**
2683 * lttng_event_recorder_enabler_ioctl - lttng syscall through ioctl
2684 *
2685 * @file: the file
2686 * @cmd: the command
2687 * @arg: command arg
2688 *
2689 * This ioctl implements lttng commands:
2690 * LTTNG_KERNEL_ABI_CONTEXT
2691 * Prepend a context field to each record of this event
2692 * LTTNG_KERNEL_ABI_ENABLE
2693 * Enable recording for this event (weak enable)
2694 * LTTNG_KERNEL_ABI_DISABLE
2695 * Disable recording for this event (strong disable)
2696 */
0a84a57f 2697static
ef784b4d 2698long lttng_event_recorder_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
0a84a57f 2699{
ef784b4d 2700 struct lttng_event_enabler *event_enabler = file->private_data;
3c997079 2701
ef784b4d
MD		 2702 switch (cmd) {
2703 case LTTNG_KERNEL_ABI_OLD_CONTEXT:
2704 {
2705 /* Not implemented */
2706 return -ENOSYS;
2707 }
2708 case LTTNG_KERNEL_ABI_CONTEXT:
2709 {
2710 /* Not implemented */
2711 return -ENOSYS;
2712 }
2713 case LTTNG_KERNEL_ABI_OLD_ENABLE:
2714 case LTTNG_KERNEL_ABI_ENABLE:
2715 return lttng_event_enabler_enable(event_enabler);
2716 case LTTNG_KERNEL_ABI_OLD_DISABLE:
2717 case LTTNG_KERNEL_ABI_DISABLE:
2718 return lttng_event_enabler_disable(event_enabler);
2719 case LTTNG_KERNEL_ABI_FILTER:
2720 return lttng_event_enabler_attach_filter_bytecode(
2721 event_enabler,
2722 (struct lttng_kernel_abi_filter_bytecode __user *) arg);
2723 case LTTNG_KERNEL_ABI_ADD_CALLSITE:
2724 return -EINVAL;
3c997079 2725 default:
ef784b4d 2726 return -ENOIOCTLCMD;
3c997079 2727 }
ef784b4d
MD		 2728}
2729
2730static
2731int lttng_event_recorder_event_release(struct inode *inode, struct file *file)
2732{
a67ba386 2733 struct lttng_kernel_event_recorder *event = file->private_data;
ef784b4d
MD		 2734
2735 if (event)
ac847066 2736 fput(event->chan->priv->parent.file);
ef784b4d
MD		 2737 return 0;
2738}
c269fff4 2739
ef784b4d
MD		 2740static
2741int lttng_event_recorder_enabler_release(struct inode *inode, struct file *file)
2742{
2743 struct lttng_event_enabler *event_enabler = file->private_data;
2744
2745 if (event_enabler)
ac847066 2746 fput(event_enabler->chan->priv->parent.file);
0a84a57f
MD		 2747 return 0;
2748}
2749
ef784b4d
MD		 2750static const struct file_operations lttng_event_recorder_event_fops = {
2751 .owner = THIS_MODULE,
2752 .release = lttng_event_recorder_event_release,
2753 .unlocked_ioctl = lttng_event_recorder_event_ioctl,
2754#ifdef CONFIG_COMPAT
2755 .compat_ioctl = lttng_event_recorder_event_ioctl,
2756#endif
2757};
2758
2759static const struct file_operations lttng_event_recorder_enabler_fops = {
a33c9927 2760 .owner = THIS_MODULE,
ef784b4d
MD		 2761 .release = lttng_event_recorder_enabler_release,
2762 .unlocked_ioctl = lttng_event_recorder_enabler_ioctl,
8070f5c0 2763#ifdef CONFIG_COMPAT
ef784b4d 2764 .compat_ioctl = lttng_event_recorder_enabler_ioctl,
8070f5c0 2765#endif
11b5a3c2 2766};
0a84a57f 2767
3b731ab1
JD		 2768static int put_u64(uint64_t val, unsigned long arg)
2769{
2770 return put_user(val, (uint64_t __user *) arg);
2771}
2772
8b97fd42
MD		 2773static int put_u32(uint32_t val, unsigned long arg)
2774{
2775 return put_user(val, (uint32_t __user *) arg);
2776}
2777
ed8d02d6
JD		 2778static long lttng_stream_ring_buffer_ioctl(struct file *filp,
2779 unsigned int cmd, unsigned long arg)
2780{
a2a1b5ab 2781 struct lttng_kernel_ring_buffer *buf = filp->private_data;
4071a628 2782 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
a2a1b5ab 2783 const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config;
da1fe18f 2784 const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops;
3b731ab1
JD		 2785 int ret;
2786
2787 if (atomic_read(&chan->record_disabled))
2788 return -EIO;
2789
ed8d02d6 2790 switch (cmd) {
606828e4 2791 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN:
3b731ab1
JD		 2792 {
2793 uint64_t ts;
2794
da1fe18f 2795 ret = ops->priv->timestamp_begin(config, buf, &ts);
3b731ab1
JD		 2796 if (ret < 0)
2797 goto error;
2798 return put_u64(ts, arg);
2799 }
606828e4 2800 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END:
3b731ab1
JD		 2801 {
2802 uint64_t ts;
2803
da1fe18f 2804 ret = ops->priv->timestamp_end(config, buf, &ts);
3b731ab1
JD		 2805 if (ret < 0)
2806 goto error;
2807 return put_u64(ts, arg);
2808 }
606828e4 2809 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED:
3b731ab1
JD		 2810 {
2811 uint64_t ed;
2812
da1fe18f 2813 ret = ops->priv->events_discarded(config, buf, &ed);
3b731ab1
JD		 2814 if (ret < 0)
2815 goto error;
2816 return put_u64(ed, arg);
2817 }
606828e4 2818 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE:
3b731ab1
JD		 2819 {
2820 uint64_t cs;
2821
da1fe18f 2822 ret = ops->priv->content_size(config, buf, &cs);
3b731ab1
JD		 2823 if (ret < 0)
2824 goto error;
2825 return put_u64(cs, arg);
2826 }
606828e4 2827 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE:
3b731ab1
JD		 2828 {
2829 uint64_t ps;
2830
da1fe18f 2831 ret = ops->priv->packet_size(config, buf, &ps);
3b731ab1
JD		 2832 if (ret < 0)
2833 goto error;
2834 return put_u64(ps, arg);
2835 }
606828e4 2836 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID:
3b731ab1
JD		 2837 {
2838 uint64_t si;
2839
da1fe18f 2840 ret = ops->priv->stream_id(config, buf, &si);
3b731ab1
JD		 2841 if (ret < 0)
2842 goto error;
2843 return put_u64(si, arg);
2844 }
606828e4 2845 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP:
2348ca17
JD		 2846 {
2847 uint64_t ts;
2848
da1fe18f 2849 ret = ops->priv->current_timestamp(config, buf, &ts);
2348ca17
JD		 2850 if (ret < 0)
2851 goto error;
2852 return put_u64(ts, arg);
2853 }
606828e4 2854 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM:
5b3cf4f9
JD		 2855 {
2856 uint64_t seq;
2857
da1fe18f 2858 ret = ops->priv->sequence_number(config, buf, &seq);
5b3cf4f9
JD		 2859 if (ret < 0)
2860 goto error;
2861 return put_u64(seq, arg);
2862 }
606828e4 2863 case LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID:
5594698f
JD		 2864 {
2865 uint64_t id;
2866
da1fe18f 2867 ret = ops->priv->instance_id(config, buf, &id);
5594698f
JD		 2868 if (ret < 0)
2869 goto error;
2870 return put_u64(id, arg);
2871 }
3b731ab1
JD		 2872 default:
2873 return lib_ring_buffer_file_operations.unlocked_ioctl(filp,
2874 cmd, arg);
ed8d02d6 2875 }
3b731ab1
JD		 2876
2877error:
2878 return -ENOSYS;
ed8d02d6
JD		 2879}
2880
2881#ifdef CONFIG_COMPAT
2882static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp,
2883 unsigned int cmd, unsigned long arg)
2884{
a2a1b5ab 2885 struct lttng_kernel_ring_buffer *buf = filp->private_data;
4071a628 2886 struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
a2a1b5ab 2887 const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config;
da1fe18f 2888 const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops;
3b731ab1
JD		 2889 int ret;
2890
2891 if (atomic_read(&chan->record_disabled))
2892 return -EIO;
2893
ed8d02d6 2894 switch (cmd) {
606828e4 2895 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN:
3b731ab1
JD		 2896 {
2897 uint64_t ts;
2898
da1fe18f 2899 ret = ops->priv->timestamp_begin(config, buf, &ts);
3b731ab1
JD		 2900 if (ret < 0)
2901 goto error;
2902 return put_u64(ts, arg);
2903 }
606828e4 2904 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_END:
3b731ab1
JD		 2905 {
2906 uint64_t ts;
2907
da1fe18f 2908 ret = ops->priv->timestamp_end(config, buf, &ts);
3b731ab1
JD		 2909 if (ret < 0)
2910 goto error;
2911 return put_u64(ts, arg);
2912 }
606828e4 2913 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED:
3b731ab1
JD		 2914 {
2915 uint64_t ed;
2916
da1fe18f 2917 ret = ops->priv->events_discarded(config, buf, &ed);
3b731ab1
JD		 2918 if (ret < 0)
2919 goto error;
2920 return put_u64(ed, arg);
ed8d02d6 2921 }
606828e4 2922 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_CONTENT_SIZE:
3b731ab1
JD		 2923 {
2924 uint64_t cs;
2925
da1fe18f 2926 ret = ops->priv->content_size(config, buf, &cs);
3b731ab1
JD		 2927 if (ret < 0)
2928 goto error;
2929 return put_u64(cs, arg);
2930 }
606828e4 2931 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_PACKET_SIZE:
3b731ab1
JD		 2932 {
2933 uint64_t ps;
2934
da1fe18f 2935 ret = ops->priv->packet_size(config, buf, &ps);
3b731ab1
JD		 2936 if (ret < 0)
2937 goto error;
2938 return put_u64(ps, arg);
2939 }
606828e4 2940 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_STREAM_ID:
3b731ab1
JD		 2941 {
2942 uint64_t si;
2943
da1fe18f 2944 ret = ops->priv->stream_id(config, buf, &si);
3b731ab1
JD		 2945 if (ret < 0)
2946 goto error;
2947 return put_u64(si, arg);
2948 }
606828e4 2949 case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP:
2348ca17
JD		 2950 {
2951 uint64_t ts;
2952
da1fe18f 2953 ret = ops->priv->current_timestamp(config, buf, &ts);
2348ca17
JD		 2954 if (ret < 0)
2955 goto error;
2956 return put_u64(ts, arg);
2957 }
606828e4 2958 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_SEQ_NUM:
5b3cf4f9
JD		 2959 {
2960 uint64_t seq;
2961
da1fe18f 2962 ret = ops->priv->sequence_number(config, buf, &seq);
5b3cf4f9
JD		 2963 if (ret < 0)
2964 goto error;
2965 return put_u64(seq, arg);
2966 }
606828e4 2967 case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_INSTANCE_ID:
5594698f
JD		 2968 {
2969 uint64_t id;
2970
da1fe18f 2971 ret = ops->priv->instance_id(config, buf, &id);
5594698f
JD		 2972 if (ret < 0)
2973 goto error;
2974 return put_u64(id, arg);
2975 }
3b731ab1
JD		 2976 default:
2977 return lib_ring_buffer_file_operations.compat_ioctl(filp,
2978 cmd, arg);
2979 }
2980
2981error:
2982 return -ENOSYS;
ed8d02d6
JD		 2983}
2984#endif /* CONFIG_COMPAT */
2985
2986static void lttng_stream_override_ring_buffer_fops(void)
2987{
2988 lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE;
2989 lttng_stream_ring_buffer_file_operations.open =
2990 lib_ring_buffer_file_operations.open;
2991 lttng_stream_ring_buffer_file_operations.release =
2992 lib_ring_buffer_file_operations.release;
2993 lttng_stream_ring_buffer_file_operations.poll =
2994 lib_ring_buffer_file_operations.poll;
2995 lttng_stream_ring_buffer_file_operations.splice_read =
2996 lib_ring_buffer_file_operations.splice_read;
2997 lttng_stream_ring_buffer_file_operations.mmap =
2998 lib_ring_buffer_file_operations.mmap;
2999 lttng_stream_ring_buffer_file_operations.unlocked_ioctl =
3000 lttng_stream_ring_buffer_ioctl;
3001 lttng_stream_ring_buffer_file_operations.llseek =
3002 lib_ring_buffer_file_operations.llseek;
3003#ifdef CONFIG_COMPAT
3004 lttng_stream_ring_buffer_file_operations.compat_ioctl =
3005 lttng_stream_ring_buffer_compat_ioctl;
3006#endif
3007}
3008
80996790 3009int __init lttng_abi_init(void)
baf20995
MD		 3010{
3011 int ret = 0;
3012
263b6c88 3013 wrapper_vmalloc_sync_mappings();
2754583e 3014 lttng_clock_ref();
f771eda6
JD		 3015
3016 ret = lttng_tp_mempool_init();
3017 if (ret) {
3018 goto error;
3019 }
3020
d29348f7 3021 lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL,
059de147 3022 &lttng_proc_ops, NULL);
2470a237 3023
255e52a4 3024 if (!lttng_proc_dentry) {
5a15f70c 3025 printk(KERN_ERR "LTTng: Error creating control file\n");
baf20995
MD		 3026 ret = -ENOMEM;
3027 goto error;
3028 }
ed8d02d6 3029 lttng_stream_override_ring_buffer_fops();
2754583e 3030 return 0;
ed8d02d6 3031
baf20995 3032error:
f771eda6 3033 lttng_tp_mempool_destroy();
2754583e 3034 lttng_clock_unref();
baf20995
MD		 3035 return ret;
3036}
3037
e6e65fcd
MD		 3038/* No __exit annotation because used by init error path too. */
3039void lttng_abi_exit(void)
baf20995 3040{
f771eda6 3041 lttng_tp_mempool_destroy();
2754583e 3042 lttng_clock_unref();
e6a17f26
MD		 3043 if (lttng_proc_dentry)
3044 remove_proc_entry("lttng", NULL);
baf20995 3045}
LTTng 2.0/0.x modules
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