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Move headers under include/
[lttng-modules.git] / lttng-abi.c
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b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
e8951e63 3 * lttng-abi.c
baf20995 4 *
e8951e63 5 * LTTng ABI
baf20995 6 *
886d51a3
MD		 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
baf20995
MD		 9 * Mimic system calls for:
10 * - session creation, returns a file descriptor or failure.
ad1c05e1
MD		 11 * - channel creation, returns a file descriptor or failure.
12 * - Operates on a session file descriptor
13 * - Takes all channel options as parameters.
14 * - stream get, returns a file descriptor or failure.
15 * - Operates on a channel file descriptor.
16 * - stream notifier get, returns a file descriptor or failure.
17 * - Operates on a channel file descriptor.
18 * - event creation, returns a file descriptor or failure.
19 * - Operates on a channel file descriptor
20 * - Takes an event name as parameter
21 * - Takes an instrumentation source as parameter
22 * - e.g. tracepoints, dynamic_probes...
23 * - Takes instrumentation source specific arguments.
baf20995
MD		 24 */
25
11b5a3c2 26#include <linux/module.h>
e6a17f26 27#include <linux/proc_fs.h>
11b5a3c2
MD		 28#include <linux/anon_inodes.h>
29#include <linux/file.h>
30#include <linux/uaccess.h>
31#include <linux/slab.h>
abc0446a 32#include <linux/err.h>
2d70eed1 33#include <linux/kref.h>
b5304713
MD		 34#include <ringbuffer/vfs.h>
35#include <ringbuffer/backend.h>
36#include <ringbuffer/frontend.h>
37#include <lttng/lttng-string-utils.h>
38#include <lttng/lttng-abi.h>
39#include <lttng/lttng-abi-old.h>
40#include <lttng/lttng-events.h>
41#include <lttng/lttng-tracer.h>
42#include <lttng/lttng-tp-mempool.h>
43#include <ringbuffer/frontend_types.h>
baf20995
MD		 44
45/*
46 * This is LTTng's own personal way to create a system call as an external
80996790 47 * module. We use ioctl() on /proc/lttng.
baf20995
MD		 48 */
49
e6a17f26 50static struct proc_dir_entry *lttng_proc_dentry;
059de147 51
059de147 52static const struct proc_ops lttng_proc_ops;
059de147 53
ad1c05e1
MD		 54static const struct file_operations lttng_session_fops;
55static const struct file_operations lttng_channel_fops;
5dbbdb43 56static const struct file_operations lttng_metadata_fops;
305d3e42 57static const struct file_operations lttng_event_fops;
ed8d02d6 58static struct file_operations lttng_stream_ring_buffer_file_operations;
baf20995 59
9616f0bf
JD		 60static int put_u64(uint64_t val, unsigned long arg);
61
a33c9927
MD		 62/*
63 * Teardown management: opened file descriptors keep a refcount on the module,
64 * so it can only exit when all file descriptors are closed.
65 */
66
ad1c05e1 67static
baf20995
MD		 68int lttng_abi_create_session(void)
69{
a90917c3 70 struct lttng_session *session;
c0e31d2e 71 struct file *session_file;
11b5a3c2 72 int session_fd, ret;
baf20995 73
a90917c3 74 session = lttng_session_create();
baf20995
MD		 75 if (!session)
76 return -ENOMEM;
34522739 77 session_fd = get_unused_fd_flags(0);
baf20995
MD		 78 if (session_fd < 0) {
79 ret = session_fd;
80 goto fd_error;
81 }
c0e31d2e 82 session_file = anon_inode_getfile("[lttng_session]",
ad1c05e1 83 &lttng_session_fops,
baf20995 84 session, O_RDWR);
c0e31d2e
MD		 85 if (IS_ERR(session_file)) {
86 ret = PTR_ERR(session_file);
baf20995
MD		 87 goto file_error;
88 }
c0e31d2e
MD		 89 session->file = session_file;
90 fd_install(session_fd, session_file);
baf20995
MD		 91 return session_fd;
92
93file_error:
94 put_unused_fd(session_fd);
95fd_error:
a90917c3 96 lttng_session_destroy(session);
baf20995
MD		 97 return ret;
98}
99
271b6681
MD		 100static
101int lttng_abi_tracepoint_list(void)
102{
103 struct file *tracepoint_list_file;
104 int file_fd, ret;
105
34522739 106 file_fd = get_unused_fd_flags(0);
271b6681
MD		 107 if (file_fd < 0) {
108 ret = file_fd;
109 goto fd_error;
110 }
30f18bf0 111
8ee099b6 112 tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]",
271b6681
MD		 113 &lttng_tracepoint_list_fops,
114 NULL, O_RDWR);
115 if (IS_ERR(tracepoint_list_file)) {
116 ret = PTR_ERR(tracepoint_list_file);
117 goto file_error;
118 }
30f18bf0
MD		 119 ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file);
120 if (ret < 0)
121 goto open_error;
271b6681
MD		 122 fd_install(file_fd, tracepoint_list_file);
123 return file_fd;
124
30f18bf0
MD		 125open_error:
126 fput(tracepoint_list_file);
271b6681
MD		 127file_error:
128 put_unused_fd(file_fd);
129fd_error:
130 return ret;
131}
132
f127e61e
MD		 133#ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
134static inline
135int lttng_abi_syscall_list(void)
136{
137 return -ENOSYS;
138}
139#else
140static
141int lttng_abi_syscall_list(void)
142{
143 struct file *syscall_list_file;
144 int file_fd, ret;
145
34522739 146 file_fd = get_unused_fd_flags(0);
f127e61e
MD		 147 if (file_fd < 0) {
148 ret = file_fd;
149 goto fd_error;
150 }
151
152 syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
153 &lttng_syscall_list_fops,
154 NULL, O_RDWR);
155 if (IS_ERR(syscall_list_file)) {
156 ret = PTR_ERR(syscall_list_file);
157 goto file_error;
158 }
159 ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
160 if (ret < 0)
161 goto open_error;
162 fd_install(file_fd, syscall_list_file);
f127e61e
MD		 163 return file_fd;
164
165open_error:
166 fput(syscall_list_file);
167file_error:
168 put_unused_fd(file_fd);
169fd_error:
170 return ret;
171}
172#endif
173
80c16bcf 174static
6dccd6c1 175void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
80c16bcf 176{
6dccd6c1
JD		 177 v->major = LTTNG_MODULES_MAJOR_VERSION;
178 v->minor = LTTNG_MODULES_MINOR_VERSION;
179 v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
80c16bcf
MD		 180}
181
42cabb80
MD		 182static
183void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v)
184{
185 v->major = LTTNG_MODULES_ABI_MAJOR_VERSION;
186 v->minor = LTTNG_MODULES_ABI_MINOR_VERSION;
187}
188
8070f5c0
MD		 189static
190long lttng_abi_add_context(struct file *file,
6dccd6c1 191 struct lttng_kernel_context *context_param,
a90917c3 192 struct lttng_ctx **ctx, struct lttng_session *session)
8070f5c0 193{
8070f5c0
MD		 194
195 if (session->been_active)
196 return -EPERM;
197
6dccd6c1 198 switch (context_param->ctx) {
12a313a5 199 case LTTNG_KERNEL_CONTEXT_PID:
8070f5c0 200 return lttng_add_pid_to_ctx(ctx);
a8ad3613
MD		 201 case LTTNG_KERNEL_CONTEXT_PRIO:
202 return lttng_add_prio_to_ctx(ctx);
53f1f0ca
MD		 203 case LTTNG_KERNEL_CONTEXT_NICE:
204 return lttng_add_nice_to_ctx(ctx);
b64bc438
MD		 205 case LTTNG_KERNEL_CONTEXT_VPID:
206 return lttng_add_vpid_to_ctx(ctx);
207 case LTTNG_KERNEL_CONTEXT_TID:
208 return lttng_add_tid_to_ctx(ctx);
209 case LTTNG_KERNEL_CONTEXT_VTID:
210 return lttng_add_vtid_to_ctx(ctx);
211 case LTTNG_KERNEL_CONTEXT_PPID:
212 return lttng_add_ppid_to_ctx(ctx);
213 case LTTNG_KERNEL_CONTEXT_VPPID:
214 return lttng_add_vppid_to_ctx(ctx);
12a313a5 215 case LTTNG_KERNEL_CONTEXT_PERF_COUNTER:
6dccd6c1
JD		 216 context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
217 return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type,
218 context_param->u.perf_counter.config,
219 context_param->u.perf_counter.name,
c24a0d71 220 ctx);
a2563e83
MD		 221 case LTTNG_KERNEL_CONTEXT_PROCNAME:
222 return lttng_add_procname_to_ctx(ctx);
975da2c0
JD		 223 case LTTNG_KERNEL_CONTEXT_HOSTNAME:
224 return lttng_add_hostname_to_ctx(ctx);
b3699d90
MD		 225 case LTTNG_KERNEL_CONTEXT_CPU_ID:
226 return lttng_add_cpu_id_to_ctx(ctx);
79150a49
JD		 227 case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE:
228 return lttng_add_interruptible_to_ctx(ctx);
229 case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE:
230 return lttng_add_need_reschedule_to_ctx(ctx);
231 case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE:
232 return lttng_add_preemptible_to_ctx(ctx);
233 case LTTNG_KERNEL_CONTEXT_MIGRATABLE:
234 return lttng_add_migratable_to_ctx(ctx);
2fa2d39a
FG		 235 case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL:
236 case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER:
237 return lttng_add_callstack_to_ctx(ctx, context_param->ctx);
a6cf40a4
MJ		 238 case LTTNG_KERNEL_CONTEXT_CGROUP_NS:
239 return lttng_add_cgroup_ns_to_ctx(ctx);
240 case LTTNG_KERNEL_CONTEXT_IPC_NS:
241 return lttng_add_ipc_ns_to_ctx(ctx);
242 case LTTNG_KERNEL_CONTEXT_MNT_NS:
243 return lttng_add_mnt_ns_to_ctx(ctx);
244 case LTTNG_KERNEL_CONTEXT_NET_NS:
245 return lttng_add_net_ns_to_ctx(ctx);
246 case LTTNG_KERNEL_CONTEXT_PID_NS:
247 return lttng_add_pid_ns_to_ctx(ctx);
248 case LTTNG_KERNEL_CONTEXT_USER_NS:
249 return lttng_add_user_ns_to_ctx(ctx);
250 case LTTNG_KERNEL_CONTEXT_UTS_NS:
251 return lttng_add_uts_ns_to_ctx(ctx);
dc923e75
MJ		 252 case LTTNG_KERNEL_CONTEXT_UID:
253 return lttng_add_uid_to_ctx(ctx);
254 case LTTNG_KERNEL_CONTEXT_EUID:
255 return lttng_add_euid_to_ctx(ctx);
256 case LTTNG_KERNEL_CONTEXT_SUID:
257 return lttng_add_suid_to_ctx(ctx);
258 case LTTNG_KERNEL_CONTEXT_GID:
259 return lttng_add_gid_to_ctx(ctx);
260 case LTTNG_KERNEL_CONTEXT_EGID:
261 return lttng_add_egid_to_ctx(ctx);
262 case LTTNG_KERNEL_CONTEXT_SGID:
263 return lttng_add_sgid_to_ctx(ctx);
264 case LTTNG_KERNEL_CONTEXT_VUID:
265 return lttng_add_vuid_to_ctx(ctx);
266 case LTTNG_KERNEL_CONTEXT_VEUID:
267 return lttng_add_veuid_to_ctx(ctx);
268 case LTTNG_KERNEL_CONTEXT_VSUID:
269 return lttng_add_vsuid_to_ctx(ctx);
270 case LTTNG_KERNEL_CONTEXT_VGID:
271 return lttng_add_vgid_to_ctx(ctx);
272 case LTTNG_KERNEL_CONTEXT_VEGID:
273 return lttng_add_vegid_to_ctx(ctx);
274 case LTTNG_KERNEL_CONTEXT_VSGID:
275 return lttng_add_vsgid_to_ctx(ctx);
8070f5c0
MD		 276 default:
277 return -EINVAL;
278 }
279}
280
ad1c05e1
MD		 281/**
282 * lttng_ioctl - lttng syscall through ioctl
283 *
c0e31d2e 284 * @file: the file
ad1c05e1
MD		 285 * @cmd: the command
286 * @arg: command arg
287 *
288 * This ioctl implements lttng commands:
38d024ae 289 * LTTNG_KERNEL_SESSION
ad1c05e1 290 * Returns a LTTng trace session file descriptor
271b6681
MD		 291 * LTTNG_KERNEL_TRACER_VERSION
292 * Returns the LTTng kernel tracer version
293 * LTTNG_KERNEL_TRACEPOINT_LIST
294 * Returns a file descriptor listing available tracepoints
360f38ea
MD		 295 * LTTNG_KERNEL_WAIT_QUIESCENT
296 * Returns after all previously running probes have completed
42cabb80
MD		 297 * LTTNG_KERNEL_TRACER_ABI_VERSION
298 * Returns the LTTng kernel tracer ABI version
ad1c05e1
MD		 299 *
300 * The returned session will be deleted when its file descriptor is closed.
301 */
302static
c0e31d2e 303long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ad1c05e1
MD		 304{
305 switch (cmd) {
6dccd6c1 306 case LTTNG_KERNEL_OLD_SESSION:
38d024ae 307 case LTTNG_KERNEL_SESSION:
ad1c05e1 308 return lttng_abi_create_session();
6dccd6c1
JD		 309 case LTTNG_KERNEL_OLD_TRACER_VERSION:
310 {
311 struct lttng_kernel_tracer_version v;
312 struct lttng_kernel_old_tracer_version oldv;
313 struct lttng_kernel_old_tracer_version *uversion =
314 (struct lttng_kernel_old_tracer_version __user *) arg;
315
316 lttng_abi_tracer_version(&v);
317 oldv.major = v.major;
318 oldv.minor = v.minor;
319 oldv.patchlevel = v.patchlevel;
320
321 if (copy_to_user(uversion, &oldv, sizeof(oldv)))
322 return -EFAULT;
323 return 0;
324 }
80c16bcf 325 case LTTNG_KERNEL_TRACER_VERSION:
6dccd6c1
JD		 326 {
327 struct lttng_kernel_tracer_version version;
328 struct lttng_kernel_tracer_version *uversion =
329 (struct lttng_kernel_tracer_version __user *) arg;
330
331 lttng_abi_tracer_version(&version);
42cabb80
MD		 332
333 if (copy_to_user(uversion, &version, sizeof(version)))
334 return -EFAULT;
335 return 0;
336 }
337 case LTTNG_KERNEL_TRACER_ABI_VERSION:
338 {
339 struct lttng_kernel_tracer_abi_version version;
340 struct lttng_kernel_tracer_abi_version *uversion =
341 (struct lttng_kernel_tracer_abi_version __user *) arg;
342
343 lttng_abi_tracer_abi_version(&version);
344
6dccd6c1
JD		 345 if (copy_to_user(uversion, &version, sizeof(version)))
346 return -EFAULT;
347 return 0;
348 }
349 case LTTNG_KERNEL_OLD_TRACEPOINT_LIST:
271b6681
MD		 350 case LTTNG_KERNEL_TRACEPOINT_LIST:
351 return lttng_abi_tracepoint_list();
2d2464bd
MD		 352 case LTTNG_KERNEL_SYSCALL_LIST:
353 return lttng_abi_syscall_list();
6dccd6c1 354 case LTTNG_KERNEL_OLD_WAIT_QUIESCENT:
5f7f9078
MD		 355 case LTTNG_KERNEL_WAIT_QUIESCENT:
356 synchronize_trace();
357 return 0;
6dccd6c1
JD		 358 case LTTNG_KERNEL_OLD_CALIBRATE:
359 {
360 struct lttng_kernel_old_calibrate __user *ucalibrate =
361 (struct lttng_kernel_old_calibrate __user *) arg;
362 struct lttng_kernel_old_calibrate old_calibrate;
363 struct lttng_kernel_calibrate calibrate;
364 int ret;
365
366 if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate)))
367 return -EFAULT;
368 calibrate.type = old_calibrate.type;
369 ret = lttng_calibrate(&calibrate);
370 if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate)))
371 return -EFAULT;
372 return ret;
373 }
57105fc2
MD		 374 case LTTNG_KERNEL_CALIBRATE:
375 {
3db41b2c
MD		 376 struct lttng_kernel_calibrate __user *ucalibrate =
377 (struct lttng_kernel_calibrate __user *) arg;
378 struct lttng_kernel_calibrate calibrate;
57105fc2
MD		 379 int ret;
380
381 if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate)))
382 return -EFAULT;
383 ret = lttng_calibrate(&calibrate);
384 if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate)))
385 return -EFAULT;
386 return ret;
387 }
ad1c05e1
MD		 388 default:
389 return -ENOIOCTLCMD;
390 }
391}
392
059de147
MJ		 393static const struct proc_ops lttng_proc_ops = {
394 .proc_ioctl = lttng_ioctl,
395#ifdef CONFIG_COMPAT
396 .proc_compat_ioctl = lttng_ioctl,
397#endif /* CONFIG_COMPAT */
398};
ad1c05e1 399
5dbbdb43 400static
c0e31d2e 401int lttng_abi_create_channel(struct file *session_file,
6dccd6c1 402 struct lttng_kernel_channel *chan_param,
5dbbdb43 403 enum channel_type channel_type)
baf20995 404{
a90917c3 405 struct lttng_session *session = session_file->private_data;
88dfd899 406 const struct file_operations *fops = NULL;
5dbbdb43 407 const char *transport_name;
a90917c3 408 struct lttng_channel *chan;
c0e31d2e 409 struct file *chan_file;
baf20995 410 int chan_fd;
ad1c05e1 411 int ret = 0;
baf20995 412
34522739 413 chan_fd = get_unused_fd_flags(0);
baf20995
MD		 414 if (chan_fd < 0) {
415 ret = chan_fd;
416 goto fd_error;
417 }
88dfd899
MD		 418 switch (channel_type) {
419 case PER_CPU_CHANNEL:
420 fops = &lttng_channel_fops;
421 break;
422 case METADATA_CHANNEL:
423 fops = &lttng_metadata_fops;
424 break;
425 }
2470a237 426
c0e31d2e 427 chan_file = anon_inode_getfile("[lttng_channel]",
88dfd899 428 fops,
03037b98 429 NULL, O_RDWR);
c0e31d2e
MD		 430 if (IS_ERR(chan_file)) {
431 ret = PTR_ERR(chan_file);
baf20995
MD		 432 goto file_error;
433 }
5dbbdb43
MD		 434 switch (channel_type) {
435 case PER_CPU_CHANNEL:
6dccd6c1
JD		 436 if (chan_param->output == LTTNG_KERNEL_SPLICE) {
437 transport_name = chan_param->overwrite ?
96ba7208 438 "relay-overwrite" : "relay-discard";
6dccd6c1
JD		 439 } else if (chan_param->output == LTTNG_KERNEL_MMAP) {
440 transport_name = chan_param->overwrite ?
96ba7208
JD		 441 "relay-overwrite-mmap" : "relay-discard-mmap";
442 } else {
443 return -EINVAL;
444 }
5dbbdb43 445 break;
5dbbdb43 446 case METADATA_CHANNEL:
6dccd6c1 447 if (chan_param->output == LTTNG_KERNEL_SPLICE)
96ba7208 448 transport_name = "relay-metadata";
6dccd6c1 449 else if (chan_param->output == LTTNG_KERNEL_MMAP)
96ba7208
JD		 450 transport_name = "relay-metadata-mmap";
451 else
452 return -EINVAL;
5dbbdb43
MD		 453 break;
454 default:
455 transport_name = "<unknown>";
456 break;
457 }
98d7281c
MJ		 458 if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) {
459 ret = -EOVERFLOW;
9c1f4643
MD		 460 goto refcount_error;
461 }
03037b98
MD		 462 /*
463 * We tolerate no failure path after channel creation. It will stay
464 * invariant for the rest of the session.
465 */
a90917c3 466 chan = lttng_channel_create(session, transport_name, NULL,
6dccd6c1
JD		 467 chan_param->subbuf_size,
468 chan_param->num_subbuf,
469 chan_param->switch_timer_interval,
d83004aa
JD		 470 chan_param->read_timer_interval,
471 channel_type);
03037b98 472 if (!chan) {
f3d01b96 473 ret = -EINVAL;
03037b98
MD		 474 goto chan_error;
475 }
11b5a3c2 476 chan->file = chan_file;
c0e31d2e
MD		 477 chan_file->private_data = chan;
478 fd_install(chan_fd, chan_file);
ad1c05e1 479
baf20995
MD		 480 return chan_fd;
481
03037b98 482chan_error:
9c1f4643
MD		 483 atomic_long_dec(&session_file->f_count);
484refcount_error:
c0e31d2e 485 fput(chan_file);
baf20995
MD		 486file_error:
487 put_unused_fd(chan_fd);
488fd_error:
baf20995
MD		 489 return ret;
490}
491
7f859fbf
JR		 492static
493int lttng_abi_session_set_name(struct lttng_session *session,
494 struct lttng_kernel_session_name *name)
495{
496 size_t len;
497
498 len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN);
499
500 if (len == LTTNG_KERNEL_SESSION_NAME_LEN) {
501 /* Name is too long/malformed */
502 return -EINVAL;
503 }
504
505 strcpy(session->name, name->name);
506 return 0;
507}
508
1c88f269
JR		 509static
510int lttng_abi_session_set_creation_time(struct lttng_session *session,
511 struct lttng_kernel_session_creation_time *time)
512{
513 size_t len;
514
515 len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN);
516
517 if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) {
518 /* Time is too long/malformed */
519 return -EINVAL;
520 }
521
522 strcpy(session->creation_time, time->iso8601);
523 return 0;
524}
525
d1f652f8
MD		 526static
527enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker)
528{
529 switch (tracker->type) {
530 case LTTNG_KERNEL_TRACKER_PID:
531 return TRACKER_PID;
532 case LTTNG_KERNEL_TRACKER_VPID:
533 return TRACKER_VPID;
534 case LTTNG_KERNEL_TRACKER_UID:
535 return TRACKER_UID;
536 case LTTNG_KERNEL_TRACKER_VUID:
537 return TRACKER_VUID;
538 case LTTNG_KERNEL_TRACKER_GID:
539 return TRACKER_GID;
540 case LTTNG_KERNEL_TRACKER_VGID:
541 return TRACKER_VGID;
542 default:
543 return TRACKER_UNKNOWN;
544 }
545}
546
baf20995 547/**
ad1c05e1 548 * lttng_session_ioctl - lttng session fd ioctl
baf20995 549 *
c0e31d2e 550 * @file: the file
baf20995
MD		 551 * @cmd: the command
552 * @arg: command arg
553 *
554 * This ioctl implements lttng commands:
38d024ae 555 * LTTNG_KERNEL_CHANNEL
baf20995 556 * Returns a LTTng channel file descriptor
e64957da
MD		 557 * LTTNG_KERNEL_ENABLE
558 * Enables tracing for a session (weak enable)
559 * LTTNG_KERNEL_DISABLE
560 * Disables tracing for a session (strong disable)
8070f5c0
MD		 561 * LTTNG_KERNEL_METADATA
562 * Returns a LTTng metadata file descriptor
e0130fab 563 * LTTNG_KERNEL_SESSION_TRACK_PID
d1f652f8 564 * Add PID to session PID tracker
e0130fab 565 * LTTNG_KERNEL_SESSION_UNTRACK_PID
d1f652f8
MD		 566 * Remove PID from session PID tracker
567 * LTTNG_KERNEL_SESSION_TRACK_ID
568 * Add ID to tracker
569 * LTTNG_KERNEL_SESSION_UNTRACK_ID
570 * Remove ID from tracker
ad1c05e1
MD		 571 *
572 * The returned channel will be deleted when its file descriptor is closed.
573 */
574static
c0e31d2e 575long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ad1c05e1 576{
a90917c3 577 struct lttng_session *session = file->private_data;
2d4c4d15
MD		 578 struct lttng_kernel_channel chan_param;
579 struct lttng_kernel_old_channel old_chan_param;
c0e31d2e 580
ad1c05e1 581 switch (cmd) {
6dccd6c1
JD		 582 case LTTNG_KERNEL_OLD_CHANNEL:
583 {
6dccd6c1
JD		 584 if (copy_from_user(&old_chan_param,
585 (struct lttng_kernel_old_channel __user *) arg,
586 sizeof(struct lttng_kernel_old_channel)))
587 return -EFAULT;
588 chan_param.overwrite = old_chan_param.overwrite;
589 chan_param.subbuf_size = old_chan_param.subbuf_size;
590 chan_param.num_subbuf = old_chan_param.num_subbuf;
591 chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
592 chan_param.read_timer_interval = old_chan_param.read_timer_interval;
593 chan_param.output = old_chan_param.output;
594
595 return lttng_abi_create_channel(file, &chan_param,
596 PER_CPU_CHANNEL);
597 }
38d024ae 598 case LTTNG_KERNEL_CHANNEL:
6dccd6c1 599 {
6dccd6c1 600 if (copy_from_user(&chan_param,
38d024ae 601 (struct lttng_kernel_channel __user *) arg,
6dccd6c1
JD		 602 sizeof(struct lttng_kernel_channel)))
603 return -EFAULT;
604 return lttng_abi_create_channel(file, &chan_param,
5dbbdb43 605 PER_CPU_CHANNEL);
6dccd6c1
JD		 606 }
607 case LTTNG_KERNEL_OLD_SESSION_START:
608 case LTTNG_KERNEL_OLD_ENABLE:
38d024ae 609 case LTTNG_KERNEL_SESSION_START:
e64957da 610 case LTTNG_KERNEL_ENABLE:
a90917c3 611 return lttng_session_enable(session);
6dccd6c1
JD		 612 case LTTNG_KERNEL_OLD_SESSION_STOP:
613 case LTTNG_KERNEL_OLD_DISABLE:
38d024ae 614 case LTTNG_KERNEL_SESSION_STOP:
e64957da 615 case LTTNG_KERNEL_DISABLE:
a90917c3 616 return lttng_session_disable(session);
6dccd6c1
JD		 617 case LTTNG_KERNEL_OLD_METADATA:
618 {
6dccd6c1
JD		 619 if (copy_from_user(&old_chan_param,
620 (struct lttng_kernel_old_channel __user *) arg,
621 sizeof(struct lttng_kernel_old_channel)))
622 return -EFAULT;
623 chan_param.overwrite = old_chan_param.overwrite;
624 chan_param.subbuf_size = old_chan_param.subbuf_size;
625 chan_param.num_subbuf = old_chan_param.num_subbuf;
626 chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
627 chan_param.read_timer_interval = old_chan_param.read_timer_interval;
628 chan_param.output = old_chan_param.output;
629
630 return lttng_abi_create_channel(file, &chan_param,
631 METADATA_CHANNEL);
632 }
38d024ae 633 case LTTNG_KERNEL_METADATA:
6dccd6c1 634 {
6dccd6c1
JD		 635 if (copy_from_user(&chan_param,
636 (struct lttng_kernel_channel __user *) arg,
637 sizeof(struct lttng_kernel_channel)))
638 return -EFAULT;
639 return lttng_abi_create_channel(file, &chan_param,
5dbbdb43 640 METADATA_CHANNEL);
6dccd6c1 641 }
e0130fab 642 case LTTNG_KERNEL_SESSION_TRACK_PID:
d1f652f8 643 return lttng_session_track_id(session, TRACKER_PID, (int) arg);
e0130fab 644 case LTTNG_KERNEL_SESSION_UNTRACK_PID:
d1f652f8
MD		 645 return lttng_session_untrack_id(session, TRACKER_PID, (int) arg);
646 case LTTNG_KERNEL_SESSION_TRACK_ID:
647 {
648 struct lttng_kernel_tracker_args tracker;
649 enum tracker_type tracker_type;
650
651 if (copy_from_user(&tracker,
652 (struct lttng_kernel_tracker_args __user *) arg,
653 sizeof(struct lttng_kernel_tracker_args)))
654 return -EFAULT;
655 tracker_type = get_tracker_type(&tracker);
656 if (tracker_type == TRACKER_UNKNOWN)
657 return -EINVAL;
658 return lttng_session_track_id(session, tracker_type, tracker.id);
659 }
660 case LTTNG_KERNEL_SESSION_UNTRACK_ID:
661 {
662 struct lttng_kernel_tracker_args tracker;
663 enum tracker_type tracker_type;
664
665 if (copy_from_user(&tracker,
666 (struct lttng_kernel_tracker_args __user *) arg,
667 sizeof(struct lttng_kernel_tracker_args)))
668 return -EFAULT;
669 tracker_type = get_tracker_type(&tracker);
670 if (tracker_type == TRACKER_UNKNOWN)
671 return -EINVAL;
672 return lttng_session_untrack_id(session, tracker_type,
673 tracker.id);
674 }
7e6f9ef6 675 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS:
d1f652f8
MD		 676 return lttng_session_list_tracker_ids(session, TRACKER_PID);
677 case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS:
678 {
679 struct lttng_kernel_tracker_args tracker;
680 enum tracker_type tracker_type;
681
682 if (copy_from_user(&tracker,
683 (struct lttng_kernel_tracker_args __user *) arg,
684 sizeof(struct lttng_kernel_tracker_args)))
685 return -EFAULT;
686 tracker_type = get_tracker_type(&tracker);
687 if (tracker_type == TRACKER_UNKNOWN)
688 return -EINVAL;
689 return lttng_session_list_tracker_ids(session, tracker_type);
690 }
9616f0bf
JD		 691 case LTTNG_KERNEL_SESSION_METADATA_REGEN:
692 return lttng_session_metadata_regenerate(session);
601252cf
MD		 693 case LTTNG_KERNEL_SESSION_STATEDUMP:
694 return lttng_session_statedump(session);
7f859fbf
JR		 695 case LTTNG_KERNEL_SESSION_SET_NAME:
696 {
697 struct lttng_kernel_session_name name;
698
699 if (copy_from_user(&name,
700 (struct lttng_kernel_session_name __user *) arg,
701 sizeof(struct lttng_kernel_session_name)))
702 return -EFAULT;
703 return lttng_abi_session_set_name(session, &name);
704 }
1c88f269
JR		 705 case LTTNG_KERNEL_SESSION_SET_CREATION_TIME:
706 {
707 struct lttng_kernel_session_creation_time time;
708
709 if (copy_from_user(&time,
710 (struct lttng_kernel_session_creation_time __user *) arg,
711 sizeof(struct lttng_kernel_session_creation_time)))
712 return -EFAULT;
713 return lttng_abi_session_set_creation_time(session, &time);
714 }
ad1c05e1
MD		 715 default:
716 return -ENOIOCTLCMD;
717 }
718}
719
03037b98
MD		 720/*
721 * Called when the last file reference is dropped.
722 *
723 * Big fat note: channels and events are invariant for the whole session after
724 * their creation. So this session destruction also destroys all channel and
725 * event structures specific to this session (they are not destroyed when their
726 * individual file is released).
727 */
ad1c05e1 728static
03037b98 729int lttng_session_release(struct inode *inode, struct file *file)
ad1c05e1 730{
a90917c3 731 struct lttng_session *session = file->private_data;
c269fff4
MD		 732
733 if (session)
a90917c3 734 lttng_session_destroy(session);
11b5a3c2 735 return 0;
ad1c05e1 736}
ad1c05e1
MD		 737
738static const struct file_operations lttng_session_fops = {
a33c9927 739 .owner = THIS_MODULE,
03037b98 740 .release = lttng_session_release,
ad1c05e1
MD		 741 .unlocked_ioctl = lttng_session_ioctl,
742#ifdef CONFIG_COMPAT
03037b98 743 .compat_ioctl = lttng_session_ioctl,
ad1c05e1 744#endif
11b5a3c2 745};
ad1c05e1 746
d83004aa
JD		 747/**
748 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
749 * @filp: the file
750 * @wait: poll table
751 *
752 * Handles the poll operations for the metadata channels.
753 */
ad1c05e1 754static
d83004aa
JD		 755unsigned int lttng_metadata_ring_buffer_poll(struct file *filp,
756 poll_table *wait)
757{
758 struct lttng_metadata_stream *stream = filp->private_data;
759 struct lib_ring_buffer *buf = stream->priv;
760 int finalized;
761 unsigned int mask = 0;
762
763 if (filp->f_mode & FMODE_READ) {
d83004aa
JD		 764 poll_wait(filp, &stream->read_wait, wait);
765
766 finalized = stream->finalized;
767
768 /*
769 * lib_ring_buffer_is_finalized() contains a smp_rmb()
770 * ordering finalized load before offsets loads.
771 */
772 WARN_ON(atomic_long_read(&buf->active_readers) != 1);
773
774 if (finalized)
775 mask |= POLLHUP;
776
92d9f5e6 777 mutex_lock(&stream->metadata_cache->lock);
d83004aa 778 if (stream->metadata_cache->metadata_written >
f613e3e6 779 stream->metadata_out)
d83004aa 780 mask |= POLLIN;
92d9f5e6 781 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 782 }
783
784 return mask;
785}
786
f613e3e6
MD		 787static
788void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp,
789 unsigned int cmd, unsigned long arg)
790{
791 struct lttng_metadata_stream *stream = filp->private_data;
792
793 stream->metadata_out = stream->metadata_in;
794}
795
d1344afa
JD		 796/*
797 * Reset the counter of how much metadata has been consumed to 0. That way,
798 * the consumer receives the content of the metadata cache unchanged. This is
799 * different from the metadata_regenerate where the offset from epoch is
800 * resampled, here we want the exact same content as the last time the metadata
801 * was generated. This command is only possible if all the metadata written
802 * in the cache has been output to the metadata stream to avoid corrupting the
803 * metadata file.
804 *
805 * Return 0 on success, a negative value on error.
806 */
807static
808int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream)
809{
810 int ret;
811 struct lttng_metadata_cache *cache = stream->metadata_cache;
812
813 mutex_lock(&cache->lock);
814 if (stream->metadata_out != cache->metadata_written) {
815 ret = -EBUSY;
816 goto end;
817 }
818 stream->metadata_out = 0;
819 stream->metadata_in = 0;
820 wake_up_interruptible(&stream->read_wait);
821 ret = 0;
822
823end:
824 mutex_unlock(&cache->lock);
825 return ret;
826}
827
d83004aa
JD		 828static
829long lttng_metadata_ring_buffer_ioctl(struct file *filp,
830 unsigned int cmd, unsigned long arg)
831{
832 int ret;
833 struct lttng_metadata_stream *stream = filp->private_data;
834 struct lib_ring_buffer *buf = stream->priv;
835
836 switch (cmd) {
d83004aa
JD		 837 case RING_BUFFER_GET_NEXT_SUBBUF:
838 {
35097f36
JD		 839 struct lttng_metadata_stream *stream = filp->private_data;
840 struct lib_ring_buffer *buf = stream->priv;
841 struct channel *chan = buf->backend.chan;
842
843 ret = lttng_metadata_output_channel(stream, chan);
844 if (ret > 0) {
845 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
846 ret = 0;
847 } else if (ret < 0)
d83004aa
JD		 848 goto err;
849 break;
850 }
f613e3e6
MD		 851 case RING_BUFFER_GET_SUBBUF:
852 {
853 /*
854 * Random access is not allowed for metadata channel.
855 */
856 return -ENOSYS;
857 }
c6f05468 858 case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
35097f36
JD		 859 case RING_BUFFER_FLUSH:
860 {
861 struct lttng_metadata_stream *stream = filp->private_data;
862 struct lib_ring_buffer *buf = stream->priv;
863 struct channel *chan = buf->backend.chan;
864
865 /*
866 * Before doing the actual ring buffer flush, write up to one
867 * packet of metadata in the ring buffer.
868 */
869 ret = lttng_metadata_output_channel(stream, chan);
870 if (ret < 0)
871 goto err;
872 break;
873 }
9616f0bf
JD		 874 case RING_BUFFER_GET_METADATA_VERSION:
875 {
876 struct lttng_metadata_stream *stream = filp->private_data;
877
878 return put_u64(stream->version, arg);
879 }
d1344afa
JD		 880 case RING_BUFFER_METADATA_CACHE_DUMP:
881 {
882 struct lttng_metadata_stream *stream = filp->private_data;
883
884 return lttng_metadata_cache_dump(stream);
885 }
d83004aa
JD		 886 default:
887 break;
888 }
f613e3e6
MD		 889 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
890
d83004aa 891 /* Performing lib ring buffer ioctl after our own. */
f613e3e6
MD		 892 ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf);
893 if (ret < 0)
894 goto err;
d83004aa 895
f613e3e6
MD		 896 switch (cmd) {
897 case RING_BUFFER_PUT_NEXT_SUBBUF:
898 {
899 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
900 cmd, arg);
901 break;
902 }
903 default:
904 break;
905 }
d83004aa
JD		 906err:
907 return ret;
908}
909
aeb9064d 910#ifdef CONFIG_COMPAT
d83004aa
JD		 911static
912long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp,
913 unsigned int cmd, unsigned long arg)
914{
915 int ret;
916 struct lttng_metadata_stream *stream = filp->private_data;
917 struct lib_ring_buffer *buf = stream->priv;
918
919 switch (cmd) {
d83004aa
JD		 920 case RING_BUFFER_GET_NEXT_SUBBUF:
921 {
35097f36
JD		 922 struct lttng_metadata_stream *stream = filp->private_data;
923 struct lib_ring_buffer *buf = stream->priv;
924 struct channel *chan = buf->backend.chan;
925
926 ret = lttng_metadata_output_channel(stream, chan);
927 if (ret > 0) {
928 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
929 ret = 0;
930 } else if (ret < 0)
d83004aa
JD		 931 goto err;
932 break;
933 }
f613e3e6
MD		 934 case RING_BUFFER_GET_SUBBUF:
935 {
936 /*
937 * Random access is not allowed for metadata channel.
938 */
939 return -ENOSYS;
940 }
c6f05468 941 case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
96c55c2f
MD		 942 case RING_BUFFER_FLUSH:
943 {
944 struct lttng_metadata_stream *stream = filp->private_data;
945 struct lib_ring_buffer *buf = stream->priv;
946 struct channel *chan = buf->backend.chan;
947
948 /*
949 * Before doing the actual ring buffer flush, write up to one
950 * packet of metadata in the ring buffer.
951 */
952 ret = lttng_metadata_output_channel(stream, chan);
953 if (ret < 0)
954 goto err;
955 break;
956 }
957 case RING_BUFFER_GET_METADATA_VERSION:
958 {
959 struct lttng_metadata_stream *stream = filp->private_data;
960
961 return put_u64(stream->version, arg);
962 }
d1344afa
JD		 963 case RING_BUFFER_METADATA_CACHE_DUMP:
964 {
965 struct lttng_metadata_stream *stream = filp->private_data;
966
967 return lttng_metadata_cache_dump(stream);
968 }
d83004aa
JD		 969 default:
970 break;
971 }
f613e3e6
MD		 972 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
973
d83004aa 974 /* Performing lib ring buffer ioctl after our own. */
f613e3e6
MD		 975 ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf);
976 if (ret < 0)
977 goto err;
d83004aa 978
f613e3e6
MD		 979 switch (cmd) {
980 case RING_BUFFER_PUT_NEXT_SUBBUF:
981 {
982 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
983 cmd, arg);
984 break;
985 }
986 default:
987 break;
988 }
d83004aa
JD		 989err:
990 return ret;
991}
aeb9064d 992#endif
d83004aa 993
b3b8072b
MD		 994/*
995 * This is not used by anonymous file descriptors. This code is left
996 * there if we ever want to implement an inode with open() operation.
997 */
d83004aa
JD		 998static
999int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file)
1000{
1001 struct lttng_metadata_stream *stream = inode->i_private;
1002 struct lib_ring_buffer *buf = stream->priv;
1003
1004 file->private_data = buf;
b3b8072b
MD		 1005 /*
1006 * Since life-time of metadata cache differs from that of
1007 * session, we need to keep our own reference on the transport.
1008 */
1009 if (!try_module_get(stream->transport->owner)) {
1010 printk(KERN_WARNING "LTT : Can't lock transport module.\n");
1011 return -EBUSY;
1012 }
d83004aa
JD		 1013 return lib_ring_buffer_open(inode, file, buf);
1014}
1015
1016static
1017int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file)
1018{
1019 struct lttng_metadata_stream *stream = file->private_data;
1020 struct lib_ring_buffer *buf = stream->priv;
1021
1022 kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy);
b3b8072b 1023 module_put(stream->transport->owner);
d83004aa
JD		 1024 return lib_ring_buffer_release(inode, file, buf);
1025}
1026
1027static
1028ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos,
1029 struct pipe_inode_info *pipe, size_t len,
1030 unsigned int flags)
1031{
1032 struct lttng_metadata_stream *stream = in->private_data;
1033 struct lib_ring_buffer *buf = stream->priv;
1034
1035 return lib_ring_buffer_splice_read(in, ppos, pipe, len,
1036 flags, buf);
1037}
1038
1039static
1040int lttng_metadata_ring_buffer_mmap(struct file *filp,
1041 struct vm_area_struct *vma)
1042{
1043 struct lttng_metadata_stream *stream = filp->private_data;
1044 struct lib_ring_buffer *buf = stream->priv;
1045
1046 return lib_ring_buffer_mmap(filp, vma, buf);
1047}
1048
1049static
1050const struct file_operations lttng_metadata_ring_buffer_file_operations = {
1051 .owner = THIS_MODULE,
1052 .open = lttng_metadata_ring_buffer_open,
1053 .release = lttng_metadata_ring_buffer_release,
1054 .poll = lttng_metadata_ring_buffer_poll,
1055 .splice_read = lttng_metadata_ring_buffer_splice_read,
1056 .mmap = lttng_metadata_ring_buffer_mmap,
1057 .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl,
1058 .llseek = vfs_lib_ring_buffer_no_llseek,
1059#ifdef CONFIG_COMPAT
1060 .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl,
1061#endif
1062};
1063
1064static
1065int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
1066 const struct file_operations *fops)
ad1c05e1 1067{
ad1c05e1 1068 int stream_fd, ret;
11b5a3c2 1069 struct file *stream_file;
ad1c05e1 1070
34522739 1071 stream_fd = get_unused_fd_flags(0);
ad1c05e1
MD		 1072 if (stream_fd < 0) {
1073 ret = stream_fd;
1074 goto fd_error;
1075 }
d83004aa
JD		 1076 stream_file = anon_inode_getfile("[lttng_stream]", fops,
1077 stream_priv, O_RDWR);
c0e31d2e
MD		 1078 if (IS_ERR(stream_file)) {
1079 ret = PTR_ERR(stream_file);
ad1c05e1
MD		 1080 goto file_error;
1081 }
409453cb
MD		 1082 /*
1083 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
1084 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
1085 * file descriptor, so we set FMODE_PREAD here.
1086 */
d7b6f197 1087 stream_file->f_mode |= FMODE_PREAD;
c0e31d2e 1088 fd_install(stream_fd, stream_file);
dda6a249
MD		 1089 /*
1090 * The stream holds a reference to the channel within the generic ring
1091 * buffer library, so no need to hold a refcount on the channel and
1092 * session files here.
1093 */
ad1c05e1
MD		 1094 return stream_fd;
1095
1096file_error:
1097 put_unused_fd(stream_fd);
d83004aa
JD		 1098fd_error:
1099 return ret;
1100}
1101
1102static
1103int lttng_abi_open_stream(struct file *channel_file)
1104{
1105 struct lttng_channel *channel = channel_file->private_data;
1106 struct lib_ring_buffer *buf;
1107 int ret;
1108 void *stream_priv;
1109
1110 buf = channel->ops->buffer_read_open(channel->chan);
1111 if (!buf)
1112 return -ENOENT;
1113
1114 stream_priv = buf;
1115 ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
ed8d02d6 1116 &lttng_stream_ring_buffer_file_operations);
d83004aa
JD		 1117 if (ret < 0)
1118 goto fd_error;
1119
1120 return ret;
1121
1122fd_error:
1123 channel->ops->buffer_read_close(buf);
1124 return ret;
1125}
1126
1127static
1128int lttng_abi_open_metadata_stream(struct file *channel_file)
1129{
1130 struct lttng_channel *channel = channel_file->private_data;
1131 struct lttng_session *session = channel->session;
1132 struct lib_ring_buffer *buf;
1133 int ret;
1134 struct lttng_metadata_stream *metadata_stream;
1135 void *stream_priv;
1136
1137 buf = channel->ops->buffer_read_open(channel->chan);
1138 if (!buf)
1139 return -ENOENT;
1140
1141 metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream),
1142 GFP_KERNEL);
b3b8072b
MD		 1143 if (!metadata_stream) {
1144 ret = -ENOMEM;
1145 goto nomem;
1146 }
d83004aa
JD		 1147 metadata_stream->metadata_cache = session->metadata_cache;
1148 init_waitqueue_head(&metadata_stream->read_wait);
1149 metadata_stream->priv = buf;
1150 stream_priv = metadata_stream;
b3b8072b
MD		 1151 metadata_stream->transport = channel->transport;
1152
1153 /*
1154 * Since life-time of metadata cache differs from that of
1155 * session, we need to keep our own reference on the transport.
1156 */
1157 if (!try_module_get(metadata_stream->transport->owner)) {
1158 printk(KERN_WARNING "LTT : Can't lock transport module.\n");
1159 ret = -EINVAL;
1160 goto notransport;
1161 }
1162
2d70eed1 1163 kref_get(&session->metadata_cache->refcount);
d83004aa
JD		 1164 ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
1165 &lttng_metadata_ring_buffer_file_operations);
1166 if (ret < 0)
1167 goto fd_error;
1168
d83004aa
JD		 1169 list_add(&metadata_stream->list,
1170 &session->metadata_cache->metadata_stream);
1171 return ret;
1172
ad1c05e1 1173fd_error:
9c1f4643 1174 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
b3b8072b
MD		 1175 module_put(metadata_stream->transport->owner);
1176notransport:
1177 kfree(metadata_stream);
1178nomem:
11b5a3c2 1179 channel->ops->buffer_read_close(buf);
ad1c05e1
MD		 1180 return ret;
1181}
1182
653fe716 1183static
c0e31d2e 1184int lttng_abi_create_event(struct file *channel_file,
6dccd6c1 1185 struct lttng_kernel_event *event_param)
653fe716 1186{
a90917c3 1187 struct lttng_channel *channel = channel_file->private_data;
653fe716 1188 int event_fd, ret;
11b5a3c2 1189 struct file *event_file;
3c997079 1190 void *priv;
653fe716 1191
6dccd6c1
JD		 1192 event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
1193 switch (event_param->instrumentation) {
7371f44c 1194 case LTTNG_KERNEL_KRETPROBE:
6dccd6c1 1195 event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
7371f44c 1196 break;
ab2277d6 1197 case LTTNG_KERNEL_KPROBE:
6dccd6c1 1198 event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
e0a7a7c4 1199 break;
ab2277d6 1200 case LTTNG_KERNEL_FUNCTION:
e884017c
MD		 1201 WARN_ON_ONCE(1);
1202 /* Not implemented. */
e0a7a7c4
MD		 1203 break;
1204 default:
1205 break;
1206 }
34522739 1207 event_fd = get_unused_fd_flags(0);
33a39a3c
MD		 1208 if (event_fd < 0) {
1209 ret = event_fd;
1210 goto fd_error;
1211 }
1212 event_file = anon_inode_getfile("[lttng_event]",
1213 &lttng_event_fops,
1214 NULL, O_RDWR);
1215 if (IS_ERR(event_file)) {
1216 ret = PTR_ERR(event_file);
1217 goto file_error;
1218 }
9c1f4643 1219 /* The event holds a reference on the channel */
98d7281c 1220 if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) {
0d2c717f 1221 ret = -EOVERFLOW;
9c1f4643
MD		 1222 goto refcount_error;
1223 }
33a39a3c
MD		 1224 if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
1225 || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
1226 struct lttng_enabler *enabler;
1227
4993071a
PP		 1228 if (strutils_is_star_glob_pattern(event_param->name)) {
1229 /*
1230 * If the event name is a star globbing pattern,
1231 * we create the special star globbing enabler.
1232 */
1233 enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB,
33a39a3c 1234 event_param, channel);
3c997079 1235 } else {
33a39a3c
MD		 1236 enabler = lttng_enabler_create(LTTNG_ENABLER_NAME,
1237 event_param, channel);
1ec65de1 1238 }
33a39a3c
MD		 1239 priv = enabler;
1240 } else {
1241 struct lttng_event *event;
4ee2453d 1242
33a39a3c
MD		 1243 /*
1244 * We tolerate no failure path after event creation. It
1245 * will stay invariant for the rest of the session.
1246 */
1247 event = lttng_event_create(channel, event_param,
1248 NULL, NULL,
1249 event_param->instrumentation);
1250 WARN_ON_ONCE(!event);
1251 if (IS_ERR(event)) {
1252 ret = PTR_ERR(event);
1253 goto event_error;
80f87dd2 1254 }
33a39a3c 1255 priv = event;
03037b98 1256 }
33a39a3c
MD		 1257 event_file->private_data = priv;
1258 fd_install(event_fd, event_file);
653fe716
MD		 1259 return event_fd;
1260
03037b98 1261event_error:
9c1f4643
MD		 1262 atomic_long_dec(&channel_file->f_count);
1263refcount_error:
c0e31d2e 1264 fput(event_file);
653fe716
MD		 1265file_error:
1266 put_unused_fd(event_fd);
1267fd_error:
653fe716
MD		 1268 return ret;
1269}
ad1c05e1
MD		 1270
1271/**
1272 * lttng_channel_ioctl - lttng syscall through ioctl
1273 *
c0e31d2e 1274 * @file: the file
ad1c05e1
MD		 1275 * @cmd: the command
1276 * @arg: command arg
1277 *
1278 * This ioctl implements lttng commands:
38d024ae 1279 * LTTNG_KERNEL_STREAM
ad1c05e1
MD		 1280 * Returns an event stream file descriptor or failure.
1281 * (typically, one event stream records events from one CPU)
38d024ae 1282 * LTTNG_KERNEL_EVENT
ad1c05e1 1283 * Returns an event file descriptor or failure.
8070f5c0
MD		 1284 * LTTNG_KERNEL_CONTEXT
1285 * Prepend a context field to each event in the channel
e64957da
MD		 1286 * LTTNG_KERNEL_ENABLE
1287 * Enable recording for events in this channel (weak enable)
1288 * LTTNG_KERNEL_DISABLE
1289 * Disable recording for events in this channel (strong disable)
baf20995 1290 *
baf20995
MD		 1291 * Channel and event file descriptors also hold a reference on the session.
1292 */
ad1c05e1 1293static
c0e31d2e 1294long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
baf20995 1295{
a90917c3 1296 struct lttng_channel *channel = file->private_data;
8070f5c0 1297
baf20995 1298 switch (cmd) {
6dccd6c1 1299 case LTTNG_KERNEL_OLD_STREAM:
38d024ae 1300 case LTTNG_KERNEL_STREAM:
c0e31d2e 1301 return lttng_abi_open_stream(file);
6dccd6c1
JD		 1302 case LTTNG_KERNEL_OLD_EVENT:
1303 {
1304 struct lttng_kernel_event *uevent_param;
1305 struct lttng_kernel_old_event *old_uevent_param;
1306 int ret;
1307
1308 uevent_param = kmalloc(sizeof(struct lttng_kernel_event),
1309 GFP_KERNEL);
1310 if (!uevent_param) {
1311 ret = -ENOMEM;
1312 goto old_event_end;
1313 }
1314 old_uevent_param = kmalloc(
1315 sizeof(struct lttng_kernel_old_event),
1316 GFP_KERNEL);
1317 if (!old_uevent_param) {
1318 ret = -ENOMEM;
1319 goto old_event_error_free_param;
1320 }
1321 if (copy_from_user(old_uevent_param,
1322 (struct lttng_kernel_old_event __user *) arg,
1323 sizeof(struct lttng_kernel_old_event))) {
1324 ret = -EFAULT;
1325 goto old_event_error_free_old_param;
1326 }
1327
1328 memcpy(uevent_param->name, old_uevent_param->name,
1329 sizeof(uevent_param->name));
1330 uevent_param->instrumentation =
1331 old_uevent_param->instrumentation;
1332
1333 switch (old_uevent_param->instrumentation) {
1334 case LTTNG_KERNEL_KPROBE:
1335 uevent_param->u.kprobe.addr =
1336 old_uevent_param->u.kprobe.addr;
1337 uevent_param->u.kprobe.offset =
1338 old_uevent_param->u.kprobe.offset;
1339 memcpy(uevent_param->u.kprobe.symbol_name,
1340 old_uevent_param->u.kprobe.symbol_name,
1341 sizeof(uevent_param->u.kprobe.symbol_name));
1342 break;
1343 case LTTNG_KERNEL_KRETPROBE:
1344 uevent_param->u.kretprobe.addr =
1345 old_uevent_param->u.kretprobe.addr;
1346 uevent_param->u.kretprobe.offset =
1347 old_uevent_param->u.kretprobe.offset;
1348 memcpy(uevent_param->u.kretprobe.symbol_name,
1349 old_uevent_param->u.kretprobe.symbol_name,
1350 sizeof(uevent_param->u.kretprobe.symbol_name));
1351 break;
1352 case LTTNG_KERNEL_FUNCTION:
e884017c
MD		 1353 WARN_ON_ONCE(1);
1354 /* Not implemented. */
6dccd6c1
JD		 1355 break;
1356 default:
1357 break;
1358 }
1359 ret = lttng_abi_create_event(file, uevent_param);
1360
1361old_event_error_free_old_param:
1362 kfree(old_uevent_param);
1363old_event_error_free_param:
1364 kfree(uevent_param);
1365old_event_end:
1366 return ret;
1367 }
38d024ae 1368 case LTTNG_KERNEL_EVENT:
6dccd6c1
JD		 1369 {
1370 struct lttng_kernel_event uevent_param;
1371
1372 if (copy_from_user(&uevent_param,
1373 (struct lttng_kernel_event __user *) arg,
1374 sizeof(uevent_param)))
1375 return -EFAULT;
1376 return lttng_abi_create_event(file, &uevent_param);
1377 }
1378 case LTTNG_KERNEL_OLD_CONTEXT:
1379 {
1380 struct lttng_kernel_context *ucontext_param;
1381 struct lttng_kernel_old_context *old_ucontext_param;
1382 int ret;
1383
1384 ucontext_param = kmalloc(sizeof(struct lttng_kernel_context),
1385 GFP_KERNEL);
1386 if (!ucontext_param) {
1387 ret = -ENOMEM;
1388 goto old_ctx_end;
1389 }
1390 old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context),
1391 GFP_KERNEL);
1392 if (!old_ucontext_param) {
1393 ret = -ENOMEM;
1394 goto old_ctx_error_free_param;
1395 }
1396
1397 if (copy_from_user(old_ucontext_param,
1398 (struct lttng_kernel_old_context __user *) arg,
1399 sizeof(struct lttng_kernel_old_context))) {
1400 ret = -EFAULT;
1401 goto old_ctx_error_free_old_param;
1402 }
1403 ucontext_param->ctx = old_ucontext_param->ctx;
1404 memcpy(ucontext_param->padding, old_ucontext_param->padding,
1405 sizeof(ucontext_param->padding));
1406 /* only type that uses the union */
1407 if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
1408 ucontext_param->u.perf_counter.type =
1409 old_ucontext_param->u.perf_counter.type;
1410 ucontext_param->u.perf_counter.config =
1411 old_ucontext_param->u.perf_counter.config;
1412 memcpy(ucontext_param->u.perf_counter.name,
1413 old_ucontext_param->u.perf_counter.name,
1414 sizeof(ucontext_param->u.perf_counter.name));
1415 }
1416
1417 ret = lttng_abi_add_context(file,
1418 ucontext_param,
1419 &channel->ctx, channel->session);
1420
1421old_ctx_error_free_old_param:
1422 kfree(old_ucontext_param);
1423old_ctx_error_free_param:
1424 kfree(ucontext_param);
1425old_ctx_end:
1426 return ret;
1427 }
8070f5c0 1428 case LTTNG_KERNEL_CONTEXT:
6dccd6c1
JD		 1429 {
1430 struct lttng_kernel_context ucontext_param;
1431
1432 if (copy_from_user(&ucontext_param,
8070f5c0 1433 (struct lttng_kernel_context __user *) arg,
6dccd6c1
JD		 1434 sizeof(ucontext_param)))
1435 return -EFAULT;
1436 return lttng_abi_add_context(file,
1437 &ucontext_param,
8070f5c0 1438 &channel->ctx, channel->session);
6dccd6c1
JD		 1439 }
1440 case LTTNG_KERNEL_OLD_ENABLE:
e64957da 1441 case LTTNG_KERNEL_ENABLE:
a90917c3 1442 return lttng_channel_enable(channel);
6dccd6c1 1443 case LTTNG_KERNEL_OLD_DISABLE:
e64957da 1444 case LTTNG_KERNEL_DISABLE:
a90917c3 1445 return lttng_channel_disable(channel);
12e579db
MD		 1446 case LTTNG_KERNEL_SYSCALL_MASK:
1447 return lttng_channel_syscall_mask(channel,
1448 (struct lttng_kernel_syscall_mask __user *) arg);
baf20995
MD		 1449 default:
1450 return -ENOIOCTLCMD;
1451 }
1452}
1453
5dbbdb43
MD		 1454/**
1455 * lttng_metadata_ioctl - lttng syscall through ioctl
1456 *
1457 * @file: the file
1458 * @cmd: the command
1459 * @arg: command arg
1460 *
1461 * This ioctl implements lttng commands:
38d024ae 1462 * LTTNG_KERNEL_STREAM
5dbbdb43
MD		 1463 * Returns an event stream file descriptor or failure.
1464 *
1465 * Channel and event file descriptors also hold a reference on the session.
1466 */
1467static
1468long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1469{
1470 switch (cmd) {
6dccd6c1 1471 case LTTNG_KERNEL_OLD_STREAM:
38d024ae 1472 case LTTNG_KERNEL_STREAM:
d83004aa 1473 return lttng_abi_open_metadata_stream(file);
5dbbdb43
MD		 1474 default:
1475 return -ENOIOCTLCMD;
1476 }
1477}
1478
653fe716
MD		 1479/**
1480 * lttng_channel_poll - lttng stream addition/removal monitoring
1481 *
c0e31d2e 1482 * @file: the file
653fe716
MD		 1483 * @wait: poll table
1484 */
c0e31d2e 1485unsigned int lttng_channel_poll(struct file *file, poll_table *wait)
653fe716 1486{
a90917c3 1487 struct lttng_channel *channel = file->private_data;
653fe716
MD		 1488 unsigned int mask = 0;
1489
c0e31d2e 1490 if (file->f_mode & FMODE_READ) {
24cedcfe
MD		 1491 poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan),
1492 wait);
653fe716 1493
254ec7bc
MD		 1494 if (channel->ops->is_disabled(channel->chan))
1495 return POLLERR;
24cedcfe 1496 if (channel->ops->is_finalized(channel->chan))
653fe716 1497 return POLLHUP;
f71ecafa 1498 if (channel->ops->buffer_has_read_closed_stream(channel->chan))
653fe716 1499 return POLLIN | POLLRDNORM;
f71ecafa 1500 return 0;
653fe716
MD		 1501 }
1502 return mask;
1503
1504}
1505
0a84a57f
MD		 1506static
1507int lttng_channel_release(struct inode *inode, struct file *file)
1508{
a90917c3 1509 struct lttng_channel *channel = file->private_data;
c269fff4
MD		 1510
1511 if (channel)
1512 fput(channel->session->file);
0a84a57f
MD		 1513 return 0;
1514}
1515
d83004aa
JD		 1516static
1517int lttng_metadata_channel_release(struct inode *inode, struct file *file)
1518{
1519 struct lttng_channel *channel = file->private_data;
1520
1521 if (channel) {
d83004aa 1522 fput(channel->session->file);
a3381417 1523 lttng_metadata_channel_destroy(channel);
d83004aa
JD		 1524 }
1525
1526 return 0;
1527}
1528
ad1c05e1 1529static const struct file_operations lttng_channel_fops = {
a33c9927 1530 .owner = THIS_MODULE,
03037b98 1531 .release = lttng_channel_release,
653fe716 1532 .poll = lttng_channel_poll,
ad1c05e1 1533 .unlocked_ioctl = lttng_channel_ioctl,
baf20995 1534#ifdef CONFIG_COMPAT
03037b98 1535 .compat_ioctl = lttng_channel_ioctl,
baf20995 1536#endif
11b5a3c2 1537};
baf20995 1538
5dbbdb43 1539static const struct file_operations lttng_metadata_fops = {
a33c9927 1540 .owner = THIS_MODULE,
d83004aa 1541 .release = lttng_metadata_channel_release,
5dbbdb43
MD		 1542 .unlocked_ioctl = lttng_metadata_ioctl,
1543#ifdef CONFIG_COMPAT
1544 .compat_ioctl = lttng_metadata_ioctl,
1545#endif
1546};
1547
8070f5c0
MD		 1548/**
1549 * lttng_event_ioctl - lttng syscall through ioctl
1550 *
1551 * @file: the file
1552 * @cmd: the command
1553 * @arg: command arg
1554 *
1555 * This ioctl implements lttng commands:
8070f5c0
MD		 1556 * LTTNG_KERNEL_CONTEXT
1557 * Prepend a context field to each record of this event
e64957da
MD		 1558 * LTTNG_KERNEL_ENABLE
1559 * Enable recording for this event (weak enable)
1560 * LTTNG_KERNEL_DISABLE
1561 * Disable recording for this event (strong disable)
8070f5c0
MD		 1562 */
1563static
1564long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1565{
3c997079
MD		 1566 struct lttng_event *event;
1567 struct lttng_enabler *enabler;
1568 enum lttng_event_type *evtype = file->private_data;
8070f5c0
MD		 1569
1570 switch (cmd) {
6dccd6c1
JD		 1571 case LTTNG_KERNEL_OLD_CONTEXT:
1572 {
3c997079
MD		 1573 /* Not implemented */
1574 return -ENOSYS;
6dccd6c1 1575 }
8070f5c0 1576 case LTTNG_KERNEL_CONTEXT:
6dccd6c1 1577 {
3c997079
MD		 1578 /* Not implemented */
1579 return -ENOSYS;
6dccd6c1
JD		 1580 }
1581 case LTTNG_KERNEL_OLD_ENABLE:
e64957da 1582 case LTTNG_KERNEL_ENABLE:
3c997079
MD		 1583 switch (*evtype) {
1584 case LTTNG_TYPE_EVENT:
1585 event = file->private_data;
1586 return lttng_event_enable(event);
1587 case LTTNG_TYPE_ENABLER:
1588 enabler = file->private_data;
1589 return lttng_enabler_enable(enabler);
1590 default:
1591 WARN_ON_ONCE(1);
1592 return -ENOSYS;
1593 }
6dccd6c1 1594 case LTTNG_KERNEL_OLD_DISABLE:
e64957da 1595 case LTTNG_KERNEL_DISABLE:
3c997079
MD		 1596 switch (*evtype) {
1597 case LTTNG_TYPE_EVENT:
1598 event = file->private_data;
1599 return lttng_event_disable(event);
1600 case LTTNG_TYPE_ENABLER:
1601 enabler = file->private_data;
1602 return lttng_enabler_disable(enabler);
1603 default:
1604 WARN_ON_ONCE(1);
1605 return -ENOSYS;
1606 }
07dfc1d0
MD		 1607 case LTTNG_KERNEL_FILTER:
1608 switch (*evtype) {
1609 case LTTNG_TYPE_EVENT:
1610 return -EINVAL;
1611 case LTTNG_TYPE_ENABLER:
1612 {
1613 enabler = file->private_data;
1614 return lttng_enabler_attach_bytecode(enabler,
1615 (struct lttng_kernel_filter_bytecode __user *) arg);
1616 }
0586316f
MD		 1617 default:
1618 WARN_ON_ONCE(1);
1619 return -ENOSYS;
07dfc1d0 1620 }
3aed4dca
FD		 1621 case LTTNG_KERNEL_ADD_CALLSITE:
1622 switch (*evtype) {
1623 case LTTNG_TYPE_EVENT:
1624 event = file->private_data;
1625 return lttng_event_add_callsite(event,
1626 (struct lttng_kernel_event_callsite __user *) arg);
1627 case LTTNG_TYPE_ENABLER:
1628 return -EINVAL;
64c147c0
MD		 1629 default:
1630 WARN_ON_ONCE(1);
1631 return -ENOSYS;
3aed4dca 1632 }
8070f5c0
MD		 1633 default:
1634 return -ENOIOCTLCMD;
1635 }
1636}
1637
0a84a57f
MD		 1638static
1639int lttng_event_release(struct inode *inode, struct file *file)
1640{
3c997079
MD		 1641 struct lttng_event *event;
1642 struct lttng_enabler *enabler;
1643 enum lttng_event_type *evtype = file->private_data;
1644
1645 if (!evtype)
1646 return 0;
1647
1648 switch (*evtype) {
1649 case LTTNG_TYPE_EVENT:
1650 event = file->private_data;
1651 if (event)
1652 fput(event->chan->file);
1653 break;
1654 case LTTNG_TYPE_ENABLER:
1655 enabler = file->private_data;
1656 if (enabler)
1657 fput(enabler->chan->file);
1658 break;
1659 default:
1660 WARN_ON_ONCE(1);
1661 break;
1662 }
c269fff4 1663
0a84a57f
MD		 1664 return 0;
1665}
1666
3b923e5b 1667/* TODO: filter control ioctl */
0a84a57f 1668static const struct file_operations lttng_event_fops = {
a33c9927 1669 .owner = THIS_MODULE,
0a84a57f 1670 .release = lttng_event_release,
8070f5c0
MD		 1671 .unlocked_ioctl = lttng_event_ioctl,
1672#ifdef CONFIG_COMPAT
1673 .compat_ioctl = lttng_event_ioctl,
1674#endif
11b5a3c2 1675};
0a84a57f 1676
3b731ab1
JD		 1677static int put_u64(uint64_t val, unsigned long arg)
1678{
1679 return put_user(val, (uint64_t __user *) arg);
1680}
1681
ed8d02d6
JD		 1682static long lttng_stream_ring_buffer_ioctl(struct file *filp,
1683 unsigned int cmd, unsigned long arg)
1684{
3b731ab1
JD		 1685 struct lib_ring_buffer *buf = filp->private_data;
1686 struct channel *chan = buf->backend.chan;
1687 const struct lib_ring_buffer_config *config = &chan->backend.config;
dd5a0db3 1688 const struct lttng_channel_ops *ops = chan->backend.priv_ops;
3b731ab1
JD		 1689 int ret;
1690
1691 if (atomic_read(&chan->record_disabled))
1692 return -EIO;
1693
ed8d02d6 1694 switch (cmd) {
3b731ab1
JD		 1695 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN:
1696 {
1697 uint64_t ts;
1698
dd5a0db3 1699 ret = ops->timestamp_begin(config, buf, &ts);
3b731ab1
JD		 1700 if (ret < 0)
1701 goto error;
1702 return put_u64(ts, arg);
1703 }
1704 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END:
1705 {
1706 uint64_t ts;
1707
dd5a0db3 1708 ret = ops->timestamp_end(config, buf, &ts);
3b731ab1
JD		 1709 if (ret < 0)
1710 goto error;
1711 return put_u64(ts, arg);
1712 }
1713 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED:
1714 {
1715 uint64_t ed;
1716
dd5a0db3 1717 ret = ops->events_discarded(config, buf, &ed);
3b731ab1
JD		 1718 if (ret < 0)
1719 goto error;
1720 return put_u64(ed, arg);
1721 }
1722 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE:
1723 {
1724 uint64_t cs;
1725
dd5a0db3 1726 ret = ops->content_size(config, buf, &cs);
3b731ab1
JD		 1727 if (ret < 0)
1728 goto error;
1729 return put_u64(cs, arg);
1730 }
1731 case LTTNG_RING_BUFFER_GET_PACKET_SIZE:
1732 {
1733 uint64_t ps;
1734
dd5a0db3 1735 ret = ops->packet_size(config, buf, &ps);
3b731ab1
JD		 1736 if (ret < 0)
1737 goto error;
1738 return put_u64(ps, arg);
1739 }
1740 case LTTNG_RING_BUFFER_GET_STREAM_ID:
1741 {
1742 uint64_t si;
1743
dd5a0db3 1744 ret = ops->stream_id(config, buf, &si);
3b731ab1
JD		 1745 if (ret < 0)
1746 goto error;
1747 return put_u64(si, arg);
1748 }
2348ca17
JD		 1749 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
1750 {
1751 uint64_t ts;
1752
dd5a0db3 1753 ret = ops->current_timestamp(config, buf, &ts);
2348ca17
JD		 1754 if (ret < 0)
1755 goto error;
1756 return put_u64(ts, arg);
1757 }
5b3cf4f9
JD		 1758 case LTTNG_RING_BUFFER_GET_SEQ_NUM:
1759 {
1760 uint64_t seq;
1761
1762 ret = ops->sequence_number(config, buf, &seq);
1763 if (ret < 0)
1764 goto error;
1765 return put_u64(seq, arg);
1766 }
5594698f
JD		 1767 case LTTNG_RING_BUFFER_INSTANCE_ID:
1768 {
1769 uint64_t id;
1770
1771 ret = ops->instance_id(config, buf, &id);
1772 if (ret < 0)
1773 goto error;
1774 return put_u64(id, arg);
1775 }
3b731ab1
JD		 1776 default:
1777 return lib_ring_buffer_file_operations.unlocked_ioctl(filp,
1778 cmd, arg);
ed8d02d6 1779 }
3b731ab1
JD		 1780
1781error:
1782 return -ENOSYS;
ed8d02d6
JD		 1783}
1784
1785#ifdef CONFIG_COMPAT
1786static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp,
1787 unsigned int cmd, unsigned long arg)
1788{
3b731ab1
JD		 1789 struct lib_ring_buffer *buf = filp->private_data;
1790 struct channel *chan = buf->backend.chan;
1791 const struct lib_ring_buffer_config *config = &chan->backend.config;
dd5a0db3 1792 const struct lttng_channel_ops *ops = chan->backend.priv_ops;
3b731ab1
JD		 1793 int ret;
1794
1795 if (atomic_read(&chan->record_disabled))
1796 return -EIO;
1797
ed8d02d6 1798 switch (cmd) {
3b731ab1
JD		 1799 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN:
1800 {
1801 uint64_t ts;
1802
dd5a0db3 1803 ret = ops->timestamp_begin(config, buf, &ts);
3b731ab1
JD		 1804 if (ret < 0)
1805 goto error;
1806 return put_u64(ts, arg);
1807 }
1808 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END:
1809 {
1810 uint64_t ts;
1811
dd5a0db3 1812 ret = ops->timestamp_end(config, buf, &ts);
3b731ab1
JD		 1813 if (ret < 0)
1814 goto error;
1815 return put_u64(ts, arg);
1816 }
1817 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED:
1818 {
1819 uint64_t ed;
1820
dd5a0db3 1821 ret = ops->events_discarded(config, buf, &ed);
3b731ab1
JD		 1822 if (ret < 0)
1823 goto error;
1824 return put_u64(ed, arg);
ed8d02d6 1825 }
3b731ab1
JD		 1826 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE:
1827 {
1828 uint64_t cs;
1829
dd5a0db3 1830 ret = ops->content_size(config, buf, &cs);
3b731ab1
JD		 1831 if (ret < 0)
1832 goto error;
1833 return put_u64(cs, arg);
1834 }
1835 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE:
1836 {
1837 uint64_t ps;
1838
dd5a0db3 1839 ret = ops->packet_size(config, buf, &ps);
3b731ab1
JD		 1840 if (ret < 0)
1841 goto error;
1842 return put_u64(ps, arg);
1843 }
1844 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID:
1845 {
1846 uint64_t si;
1847
dd5a0db3 1848 ret = ops->stream_id(config, buf, &si);
3b731ab1
JD		 1849 if (ret < 0)
1850 goto error;
1851 return put_u64(si, arg);
1852 }
2348ca17
JD		 1853 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
1854 {
1855 uint64_t ts;
1856
dd5a0db3 1857 ret = ops->current_timestamp(config, buf, &ts);
2348ca17
JD		 1858 if (ret < 0)
1859 goto error;
1860 return put_u64(ts, arg);
1861 }
5b3cf4f9
JD		 1862 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM:
1863 {
1864 uint64_t seq;
1865
1866 ret = ops->sequence_number(config, buf, &seq);
1867 if (ret < 0)
1868 goto error;
1869 return put_u64(seq, arg);
1870 }
5594698f
JD		 1871 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID:
1872 {
1873 uint64_t id;
1874
1875 ret = ops->instance_id(config, buf, &id);
1876 if (ret < 0)
1877 goto error;
1878 return put_u64(id, arg);
1879 }
3b731ab1
JD		 1880 default:
1881 return lib_ring_buffer_file_operations.compat_ioctl(filp,
1882 cmd, arg);
1883 }
1884
1885error:
1886 return -ENOSYS;
ed8d02d6
JD		 1887}
1888#endif /* CONFIG_COMPAT */
1889
1890static void lttng_stream_override_ring_buffer_fops(void)
1891{
1892 lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE;
1893 lttng_stream_ring_buffer_file_operations.open =
1894 lib_ring_buffer_file_operations.open;
1895 lttng_stream_ring_buffer_file_operations.release =
1896 lib_ring_buffer_file_operations.release;
1897 lttng_stream_ring_buffer_file_operations.poll =
1898 lib_ring_buffer_file_operations.poll;
1899 lttng_stream_ring_buffer_file_operations.splice_read =
1900 lib_ring_buffer_file_operations.splice_read;
1901 lttng_stream_ring_buffer_file_operations.mmap =
1902 lib_ring_buffer_file_operations.mmap;
1903 lttng_stream_ring_buffer_file_operations.unlocked_ioctl =
1904 lttng_stream_ring_buffer_ioctl;
1905 lttng_stream_ring_buffer_file_operations.llseek =
1906 lib_ring_buffer_file_operations.llseek;
1907#ifdef CONFIG_COMPAT
1908 lttng_stream_ring_buffer_file_operations.compat_ioctl =
1909 lttng_stream_ring_buffer_compat_ioctl;
1910#endif
1911}
1912
80996790 1913int __init lttng_abi_init(void)
baf20995
MD		 1914{
1915 int ret = 0;
1916
2754583e 1917 lttng_clock_ref();
f771eda6
JD		 1918
1919 ret = lttng_tp_mempool_init();
1920 if (ret) {
1921 goto error;
1922 }
1923
d29348f7 1924 lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL,
059de147 1925 &lttng_proc_ops, NULL);
2470a237 1926
255e52a4 1927 if (!lttng_proc_dentry) {
baf20995
MD		 1928 printk(KERN_ERR "Error creating LTTng control file\n");
1929 ret = -ENOMEM;
1930 goto error;
1931 }
ed8d02d6 1932 lttng_stream_override_ring_buffer_fops();
2754583e 1933 return 0;
ed8d02d6 1934
baf20995 1935error:
f771eda6 1936 lttng_tp_mempool_destroy();
2754583e 1937 lttng_clock_unref();
baf20995
MD		 1938 return ret;
1939}
1940
e6e65fcd
MD		 1941/* No __exit annotation because used by init error path too. */
1942void lttng_abi_exit(void)
baf20995 1943{
f771eda6 1944 lttng_tp_mempool_destroy();
2754583e 1945 lttng_clock_unref();
e6a17f26
MD		 1946 if (lttng_proc_dentry)
1947 remove_proc_entry("lttng", NULL);
baf20995 1948}
LTTng 2.0/0.x modules
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