Commit | Line | Data |
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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> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
24591303 MD |
34 | #include <ringbuffer/vfs.h> |
35 | #include <ringbuffer/backend.h> | |
36 | #include <ringbuffer/frontend.h> | |
241ae9a8 MD |
37 | #include <wrapper/poll.h> |
38 | #include <wrapper/file.h> | |
39 | #include <wrapper/kref.h> | |
2df37e95 MD |
40 | #include <lttng/string-utils.h> |
41 | #include <lttng/abi.h> | |
42 | #include <lttng/abi-old.h> | |
43 | #include <lttng/events.h> | |
44 | #include <lttng/tracer.h> | |
45 | #include <lttng/tp-mempool.h> | |
24591303 | 46 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 47 | #include <ringbuffer/iterator.h> |
baf20995 MD |
48 | |
49 | /* | |
50 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 51 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
52 | */ |
53 | ||
e6a17f26 | 54 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
55 | |
56 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
57 | static const struct proc_ops lttng_proc_ops; | |
58 | #else | |
59 | static const struct file_operations lttng_proc_ops; | |
60 | #endif | |
61 | ||
ad1c05e1 | 62 | static const struct file_operations lttng_session_fops; |
750b05f2 | 63 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 64 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 65 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 66 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 67 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 68 | |
9616f0bf | 69 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 70 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 71 | |
99f52fcc FD |
72 | static int validate_zeroed_padding(char *p, size_t len) |
73 | { | |
74 | size_t i; | |
75 | ||
76 | for (i = 0; i < len; i++) { | |
77 | if (p[i]) | |
78 | return -1; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
a33c9927 MD |
83 | /* |
84 | * Teardown management: opened file descriptors keep a refcount on the module, | |
85 | * so it can only exit when all file descriptors are closed. | |
86 | */ | |
87 | ||
ad1c05e1 | 88 | static |
baf20995 MD |
89 | int lttng_abi_create_session(void) |
90 | { | |
a90917c3 | 91 | struct lttng_session *session; |
c0e31d2e | 92 | struct file *session_file; |
11b5a3c2 | 93 | int session_fd, ret; |
baf20995 | 94 | |
a90917c3 | 95 | session = lttng_session_create(); |
baf20995 MD |
96 | if (!session) |
97 | return -ENOMEM; | |
4ac10b76 | 98 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
99 | if (session_fd < 0) { |
100 | ret = session_fd; | |
101 | goto fd_error; | |
102 | } | |
c0e31d2e | 103 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 104 | <tng_session_fops, |
baf20995 | 105 | session, O_RDWR); |
c0e31d2e MD |
106 | if (IS_ERR(session_file)) { |
107 | ret = PTR_ERR(session_file); | |
baf20995 MD |
108 | goto file_error; |
109 | } | |
c0e31d2e MD |
110 | session->file = session_file; |
111 | fd_install(session_fd, session_file); | |
baf20995 MD |
112 | return session_fd; |
113 | ||
114 | file_error: | |
115 | put_unused_fd(session_fd); | |
116 | fd_error: | |
a90917c3 | 117 | lttng_session_destroy(session); |
baf20995 MD |
118 | return ret; |
119 | } | |
120 | ||
21f58fb7 FD |
121 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
122 | { | |
123 | struct lttng_event_notifier_group *event_notifier_group = | |
124 | container_of(entry, struct lttng_event_notifier_group, | |
125 | wakeup_pending); | |
126 | wake_up_interruptible(&event_notifier_group->read_wait); | |
127 | } | |
128 | ||
750b05f2 FD |
129 | static |
130 | int lttng_abi_create_event_notifier_group(void) | |
131 | { | |
132 | struct lttng_event_notifier_group *event_notifier_group; | |
133 | struct file *event_notifier_group_file; | |
134 | int event_notifier_group_fd, ret; | |
135 | ||
136 | event_notifier_group = lttng_event_notifier_group_create(); | |
137 | if (!event_notifier_group) | |
138 | return -ENOMEM; | |
139 | ||
140 | event_notifier_group_fd = lttng_get_unused_fd(); | |
141 | if (event_notifier_group_fd < 0) { | |
142 | ret = event_notifier_group_fd; | |
143 | goto fd_error; | |
144 | } | |
145 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
146 | <tng_event_notifier_group_fops, | |
147 | event_notifier_group, O_RDWR); | |
148 | if (IS_ERR(event_notifier_group_file)) { | |
149 | ret = PTR_ERR(event_notifier_group_file); | |
150 | goto file_error; | |
151 | } | |
152 | ||
153 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
154 | init_waitqueue_head(&event_notifier_group->read_wait); |
155 | init_irq_work(&event_notifier_group->wakeup_pending, | |
156 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
157 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
158 | return event_notifier_group_fd; | |
159 | ||
160 | file_error: | |
161 | put_unused_fd(event_notifier_group_fd); | |
162 | fd_error: | |
163 | lttng_event_notifier_group_destroy(event_notifier_group); | |
164 | return ret; | |
165 | } | |
166 | ||
271b6681 MD |
167 | static |
168 | int lttng_abi_tracepoint_list(void) | |
169 | { | |
170 | struct file *tracepoint_list_file; | |
171 | int file_fd, ret; | |
172 | ||
4ac10b76 | 173 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
174 | if (file_fd < 0) { |
175 | ret = file_fd; | |
176 | goto fd_error; | |
177 | } | |
30f18bf0 | 178 | |
8ee099b6 | 179 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
180 | <tng_tracepoint_list_fops, |
181 | NULL, O_RDWR); | |
182 | if (IS_ERR(tracepoint_list_file)) { | |
183 | ret = PTR_ERR(tracepoint_list_file); | |
184 | goto file_error; | |
185 | } | |
30f18bf0 MD |
186 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
187 | if (ret < 0) | |
188 | goto open_error; | |
271b6681 MD |
189 | fd_install(file_fd, tracepoint_list_file); |
190 | return file_fd; | |
191 | ||
30f18bf0 MD |
192 | open_error: |
193 | fput(tracepoint_list_file); | |
271b6681 MD |
194 | file_error: |
195 | put_unused_fd(file_fd); | |
196 | fd_error: | |
197 | return ret; | |
198 | } | |
199 | ||
f127e61e MD |
200 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
201 | static inline | |
202 | int lttng_abi_syscall_list(void) | |
203 | { | |
204 | return -ENOSYS; | |
205 | } | |
206 | #else | |
207 | static | |
208 | int lttng_abi_syscall_list(void) | |
209 | { | |
210 | struct file *syscall_list_file; | |
211 | int file_fd, ret; | |
212 | ||
213 | file_fd = lttng_get_unused_fd(); | |
214 | if (file_fd < 0) { | |
215 | ret = file_fd; | |
216 | goto fd_error; | |
217 | } | |
218 | ||
219 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
220 | <tng_syscall_list_fops, | |
221 | NULL, O_RDWR); | |
222 | if (IS_ERR(syscall_list_file)) { | |
223 | ret = PTR_ERR(syscall_list_file); | |
224 | goto file_error; | |
225 | } | |
226 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
227 | if (ret < 0) | |
228 | goto open_error; | |
229 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
230 | return file_fd; |
231 | ||
232 | open_error: | |
233 | fput(syscall_list_file); | |
234 | file_error: | |
235 | put_unused_fd(file_fd); | |
236 | fd_error: | |
237 | return ret; | |
238 | } | |
239 | #endif | |
240 | ||
80c16bcf | 241 | static |
6dccd6c1 | 242 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 243 | { |
6dccd6c1 JD |
244 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
245 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
246 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
247 | } |
248 | ||
42cabb80 MD |
249 | static |
250 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
251 | { | |
252 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
253 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
254 | } | |
255 | ||
8070f5c0 MD |
256 | static |
257 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 258 | struct lttng_kernel_context *context_param, |
a90917c3 | 259 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 260 | { |
8070f5c0 MD |
261 | |
262 | if (session->been_active) | |
263 | return -EPERM; | |
264 | ||
6dccd6c1 | 265 | switch (context_param->ctx) { |
12a313a5 | 266 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 267 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
268 | case LTTNG_KERNEL_CONTEXT_PRIO: |
269 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
270 | case LTTNG_KERNEL_CONTEXT_NICE: |
271 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
272 | case LTTNG_KERNEL_CONTEXT_VPID: |
273 | return lttng_add_vpid_to_ctx(ctx); | |
274 | case LTTNG_KERNEL_CONTEXT_TID: | |
275 | return lttng_add_tid_to_ctx(ctx); | |
276 | case LTTNG_KERNEL_CONTEXT_VTID: | |
277 | return lttng_add_vtid_to_ctx(ctx); | |
278 | case LTTNG_KERNEL_CONTEXT_PPID: | |
279 | return lttng_add_ppid_to_ctx(ctx); | |
280 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
281 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 282 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
283 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
284 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
285 | context_param->u.perf_counter.config, | |
286 | context_param->u.perf_counter.name, | |
c24a0d71 | 287 | ctx); |
a2563e83 MD |
288 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
289 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
290 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
291 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
292 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
293 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
294 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
295 | return lttng_add_interruptible_to_ctx(ctx); | |
296 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
297 | return lttng_add_need_reschedule_to_ctx(ctx); | |
298 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
299 | return lttng_add_preemptible_to_ctx(ctx); | |
300 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
301 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
302 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
303 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
304 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
305 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
306 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
307 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
308 | return lttng_add_ipc_ns_to_ctx(ctx); | |
309 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
310 | return lttng_add_mnt_ns_to_ctx(ctx); | |
311 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
312 | return lttng_add_net_ns_to_ctx(ctx); | |
313 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
314 | return lttng_add_pid_ns_to_ctx(ctx); | |
315 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
316 | return lttng_add_user_ns_to_ctx(ctx); | |
317 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
318 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
319 | case LTTNG_KERNEL_CONTEXT_UID: |
320 | return lttng_add_uid_to_ctx(ctx); | |
321 | case LTTNG_KERNEL_CONTEXT_EUID: | |
322 | return lttng_add_euid_to_ctx(ctx); | |
323 | case LTTNG_KERNEL_CONTEXT_SUID: | |
324 | return lttng_add_suid_to_ctx(ctx); | |
325 | case LTTNG_KERNEL_CONTEXT_GID: | |
326 | return lttng_add_gid_to_ctx(ctx); | |
327 | case LTTNG_KERNEL_CONTEXT_EGID: | |
328 | return lttng_add_egid_to_ctx(ctx); | |
329 | case LTTNG_KERNEL_CONTEXT_SGID: | |
330 | return lttng_add_sgid_to_ctx(ctx); | |
331 | case LTTNG_KERNEL_CONTEXT_VUID: | |
332 | return lttng_add_vuid_to_ctx(ctx); | |
333 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
334 | return lttng_add_veuid_to_ctx(ctx); | |
335 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
336 | return lttng_add_vsuid_to_ctx(ctx); | |
337 | case LTTNG_KERNEL_CONTEXT_VGID: | |
338 | return lttng_add_vgid_to_ctx(ctx); | |
339 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
340 | return lttng_add_vegid_to_ctx(ctx); | |
341 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
342 | return lttng_add_vsgid_to_ctx(ctx); | |
876e2e92 MJ |
343 | case LTTNG_KERNEL_CONTEXT_TIME_NS: |
344 | return lttng_add_time_ns_to_ctx(ctx); | |
8070f5c0 MD |
345 | default: |
346 | return -EINVAL; | |
347 | } | |
348 | } | |
349 | ||
ad1c05e1 MD |
350 | /** |
351 | * lttng_ioctl - lttng syscall through ioctl | |
352 | * | |
c0e31d2e | 353 | * @file: the file |
ad1c05e1 MD |
354 | * @cmd: the command |
355 | * @arg: command arg | |
356 | * | |
357 | * This ioctl implements lttng commands: | |
38d024ae | 358 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 359 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
360 | * LTTNG_KERNEL_TRACER_VERSION |
361 | * Returns the LTTng kernel tracer version | |
362 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
363 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
364 | * LTTNG_KERNEL_WAIT_QUIESCENT |
365 | * Returns after all previously running probes have completed | |
42cabb80 MD |
366 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
367 | * Returns the LTTng kernel tracer ABI version | |
750b05f2 FD |
368 | * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE |
369 | * Returns a LTTng event notifier group file descriptor | |
ad1c05e1 MD |
370 | * |
371 | * The returned session will be deleted when its file descriptor is closed. | |
372 | */ | |
373 | static | |
c0e31d2e | 374 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
375 | { |
376 | switch (cmd) { | |
6dccd6c1 | 377 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 378 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 379 | return lttng_abi_create_session(); |
750b05f2 FD |
380 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE: |
381 | return lttng_abi_create_event_notifier_group(); | |
6dccd6c1 JD |
382 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
383 | { | |
384 | struct lttng_kernel_tracer_version v; | |
385 | struct lttng_kernel_old_tracer_version oldv; | |
386 | struct lttng_kernel_old_tracer_version *uversion = | |
387 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
388 | ||
389 | lttng_abi_tracer_version(&v); | |
390 | oldv.major = v.major; | |
391 | oldv.minor = v.minor; | |
392 | oldv.patchlevel = v.patchlevel; | |
393 | ||
394 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
395 | return -EFAULT; | |
396 | return 0; | |
397 | } | |
80c16bcf | 398 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
399 | { |
400 | struct lttng_kernel_tracer_version version; | |
401 | struct lttng_kernel_tracer_version *uversion = | |
402 | (struct lttng_kernel_tracer_version __user *) arg; | |
403 | ||
404 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
405 | |
406 | if (copy_to_user(uversion, &version, sizeof(version))) | |
407 | return -EFAULT; | |
408 | return 0; | |
409 | } | |
410 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
411 | { | |
412 | struct lttng_kernel_tracer_abi_version version; | |
413 | struct lttng_kernel_tracer_abi_version *uversion = | |
414 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
415 | ||
416 | lttng_abi_tracer_abi_version(&version); | |
417 | ||
6dccd6c1 JD |
418 | if (copy_to_user(uversion, &version, sizeof(version))) |
419 | return -EFAULT; | |
420 | return 0; | |
421 | } | |
422 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
423 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
424 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
425 | case LTTNG_KERNEL_SYSCALL_LIST: |
426 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 427 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
428 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
429 | synchronize_trace(); | |
430 | return 0; | |
6dccd6c1 JD |
431 | case LTTNG_KERNEL_OLD_CALIBRATE: |
432 | { | |
433 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
434 | (struct lttng_kernel_old_calibrate __user *) arg; | |
435 | struct lttng_kernel_old_calibrate old_calibrate; | |
436 | struct lttng_kernel_calibrate calibrate; | |
437 | int ret; | |
438 | ||
439 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
440 | return -EFAULT; | |
441 | calibrate.type = old_calibrate.type; | |
442 | ret = lttng_calibrate(&calibrate); | |
443 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
444 | return -EFAULT; | |
445 | return ret; | |
446 | } | |
57105fc2 MD |
447 | case LTTNG_KERNEL_CALIBRATE: |
448 | { | |
3db41b2c MD |
449 | struct lttng_kernel_calibrate __user *ucalibrate = |
450 | (struct lttng_kernel_calibrate __user *) arg; | |
451 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
452 | int ret; |
453 | ||
454 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
455 | return -EFAULT; | |
456 | ret = lttng_calibrate(&calibrate); | |
457 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
458 | return -EFAULT; | |
459 | return ret; | |
460 | } | |
ad1c05e1 MD |
461 | default: |
462 | return -ENOIOCTLCMD; | |
463 | } | |
464 | } | |
465 | ||
059de147 MJ |
466 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
467 | static const struct proc_ops lttng_proc_ops = { | |
468 | .proc_ioctl = lttng_ioctl, | |
469 | #ifdef CONFIG_COMPAT | |
470 | .proc_compat_ioctl = lttng_ioctl, | |
471 | #endif /* CONFIG_COMPAT */ | |
472 | }; | |
473 | #else | |
474 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 475 | .owner = THIS_MODULE, |
ad1c05e1 MD |
476 | .unlocked_ioctl = lttng_ioctl, |
477 | #ifdef CONFIG_COMPAT | |
03037b98 | 478 | .compat_ioctl = lttng_ioctl, |
059de147 | 479 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 480 | }; |
059de147 | 481 | #endif |
ad1c05e1 | 482 | |
5dbbdb43 | 483 | static |
c0e31d2e | 484 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 485 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 486 | enum channel_type channel_type) |
baf20995 | 487 | { |
a90917c3 | 488 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 489 | const struct file_operations *fops = NULL; |
5dbbdb43 | 490 | const char *transport_name; |
a90917c3 | 491 | struct lttng_channel *chan; |
c0e31d2e | 492 | struct file *chan_file; |
baf20995 | 493 | int chan_fd; |
ad1c05e1 | 494 | int ret = 0; |
baf20995 | 495 | |
4ac10b76 | 496 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
497 | if (chan_fd < 0) { |
498 | ret = chan_fd; | |
499 | goto fd_error; | |
500 | } | |
88dfd899 MD |
501 | switch (channel_type) { |
502 | case PER_CPU_CHANNEL: | |
503 | fops = <tng_channel_fops; | |
504 | break; | |
505 | case METADATA_CHANNEL: | |
506 | fops = <tng_metadata_fops; | |
507 | break; | |
508 | } | |
2470a237 | 509 | |
c0e31d2e | 510 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 511 | fops, |
03037b98 | 512 | NULL, O_RDWR); |
c0e31d2e MD |
513 | if (IS_ERR(chan_file)) { |
514 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
515 | goto file_error; |
516 | } | |
5dbbdb43 MD |
517 | switch (channel_type) { |
518 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
519 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
520 | transport_name = chan_param->overwrite ? | |
96ba7208 | 521 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
522 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
523 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
524 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
525 | } else { | |
526 | return -EINVAL; | |
527 | } | |
5dbbdb43 | 528 | break; |
5dbbdb43 | 529 | case METADATA_CHANNEL: |
6dccd6c1 | 530 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 531 | transport_name = "relay-metadata"; |
6dccd6c1 | 532 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
533 | transport_name = "relay-metadata-mmap"; |
534 | else | |
535 | return -EINVAL; | |
5dbbdb43 MD |
536 | break; |
537 | default: | |
538 | transport_name = "<unknown>"; | |
539 | break; | |
540 | } | |
98d7281c MJ |
541 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
542 | ret = -EOVERFLOW; | |
9c1f4643 MD |
543 | goto refcount_error; |
544 | } | |
03037b98 MD |
545 | /* |
546 | * We tolerate no failure path after channel creation. It will stay | |
547 | * invariant for the rest of the session. | |
548 | */ | |
a90917c3 | 549 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
550 | chan_param->subbuf_size, |
551 | chan_param->num_subbuf, | |
552 | chan_param->switch_timer_interval, | |
d83004aa JD |
553 | chan_param->read_timer_interval, |
554 | channel_type); | |
03037b98 | 555 | if (!chan) { |
f3d01b96 | 556 | ret = -EINVAL; |
03037b98 MD |
557 | goto chan_error; |
558 | } | |
11b5a3c2 | 559 | chan->file = chan_file; |
c0e31d2e MD |
560 | chan_file->private_data = chan; |
561 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 562 | |
baf20995 MD |
563 | return chan_fd; |
564 | ||
03037b98 | 565 | chan_error: |
9c1f4643 MD |
566 | atomic_long_dec(&session_file->f_count); |
567 | refcount_error: | |
c0e31d2e | 568 | fput(chan_file); |
baf20995 MD |
569 | file_error: |
570 | put_unused_fd(chan_fd); | |
571 | fd_error: | |
baf20995 MD |
572 | return ret; |
573 | } | |
574 | ||
7f859fbf JR |
575 | static |
576 | int lttng_abi_session_set_name(struct lttng_session *session, | |
577 | struct lttng_kernel_session_name *name) | |
578 | { | |
579 | size_t len; | |
580 | ||
581 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
582 | ||
583 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
584 | /* Name is too long/malformed */ | |
585 | return -EINVAL; | |
586 | } | |
587 | ||
588 | strcpy(session->name, name->name); | |
589 | return 0; | |
590 | } | |
591 | ||
1c88f269 JR |
592 | static |
593 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
594 | struct lttng_kernel_session_creation_time *time) | |
595 | { | |
596 | size_t len; | |
597 | ||
598 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
599 | ||
600 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
601 | /* Time is too long/malformed */ | |
602 | return -EINVAL; | |
603 | } | |
604 | ||
605 | strcpy(session->creation_time, time->iso8601); | |
606 | return 0; | |
607 | } | |
608 | ||
99f52fcc FD |
609 | static |
610 | int lttng_counter_release(struct inode *inode, struct file *file) | |
611 | { | |
612 | struct lttng_counter *counter = file->private_data; | |
613 | ||
614 | if (counter) { | |
615 | /* | |
616 | * Do not destroy the counter itself. Wait of the owner | |
617 | * (event_notifier group) to be destroyed. | |
618 | */ | |
619 | fput(counter->owner); | |
620 | } | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
625 | static | |
626 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
627 | { | |
628 | struct lttng_counter *counter = file->private_data; | |
629 | size_t indexes[LTTNG_KERNEL_COUNTER_DIMENSION_MAX] = { 0 }; | |
630 | int i; | |
631 | ||
632 | switch (cmd) { | |
633 | case LTTNG_KERNEL_COUNTER_READ: | |
634 | { | |
635 | struct lttng_kernel_counter_read local_counter_read; | |
636 | struct lttng_kernel_counter_read __user *ucounter_read = | |
637 | (struct lttng_kernel_counter_read __user *) arg; | |
638 | bool overflow, underflow; | |
639 | int64_t value; | |
640 | int32_t cpu; | |
641 | int ret; | |
642 | ||
643 | if (copy_from_user(&local_counter_read, ucounter_read, | |
644 | sizeof(local_counter_read))) | |
645 | return -EFAULT; | |
646 | if (validate_zeroed_padding(local_counter_read.padding, | |
647 | sizeof(local_counter_read.padding))) | |
648 | return -EINVAL; | |
649 | ||
650 | /* Cast all indexes into size_t. */ | |
651 | for (i = 0; i < local_counter_read.index.number_dimensions; i++) | |
652 | indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i]; | |
653 | cpu = local_counter_read.cpu; | |
654 | ||
655 | ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, | |
656 | &overflow, &underflow); | |
657 | if (ret) | |
658 | return ret; | |
659 | local_counter_read.value.value = value; | |
660 | local_counter_read.value.overflow = overflow; | |
661 | local_counter_read.value.underflow = underflow; | |
662 | ||
663 | if (copy_to_user(&ucounter_read->value, &local_counter_read.value, | |
664 | sizeof(local_counter_read.value))) | |
665 | return -EFAULT; | |
666 | ||
667 | return 0; | |
668 | } | |
669 | case LTTNG_KERNEL_COUNTER_AGGREGATE: | |
670 | { | |
671 | struct lttng_kernel_counter_aggregate local_counter_aggregate; | |
672 | struct lttng_kernel_counter_aggregate __user *ucounter_aggregate = | |
673 | (struct lttng_kernel_counter_aggregate __user *) arg; | |
674 | bool overflow, underflow; | |
675 | int64_t value; | |
676 | int ret; | |
677 | ||
678 | if (copy_from_user(&local_counter_aggregate, ucounter_aggregate, | |
679 | sizeof(local_counter_aggregate))) | |
680 | return -EFAULT; | |
681 | if (validate_zeroed_padding(local_counter_aggregate.padding, | |
682 | sizeof(local_counter_aggregate.padding))) | |
683 | return -EINVAL; | |
684 | ||
685 | /* Cast all indexes into size_t. */ | |
686 | for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++) | |
687 | indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i]; | |
688 | ||
689 | ret = lttng_kernel_counter_aggregate(counter, indexes, &value, | |
690 | &overflow, &underflow); | |
691 | if (ret) | |
692 | return ret; | |
693 | local_counter_aggregate.value.value = value; | |
694 | local_counter_aggregate.value.overflow = overflow; | |
695 | local_counter_aggregate.value.underflow = underflow; | |
696 | ||
697 | if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value, | |
698 | sizeof(local_counter_aggregate.value))) | |
699 | return -EFAULT; | |
700 | ||
701 | return 0; | |
702 | } | |
703 | case LTTNG_KERNEL_COUNTER_CLEAR: | |
704 | { | |
705 | struct lttng_kernel_counter_clear local_counter_clear; | |
706 | struct lttng_kernel_counter_clear __user *ucounter_clear = | |
707 | (struct lttng_kernel_counter_clear __user *) arg; | |
708 | ||
709 | if (copy_from_user(&local_counter_clear, ucounter_clear, | |
710 | sizeof(local_counter_clear))) | |
711 | return -EFAULT; | |
712 | if (validate_zeroed_padding(local_counter_clear.padding, | |
713 | sizeof(local_counter_clear.padding))) | |
714 | return -EINVAL; | |
715 | ||
716 | /* Cast all indexes into size_t. */ | |
717 | for (i = 0; i < local_counter_clear.index.number_dimensions; i++) | |
718 | indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i]; | |
719 | ||
720 | return lttng_kernel_counter_clear(counter, indexes); | |
721 | } | |
722 | default: | |
723 | WARN_ON_ONCE(1); | |
724 | return -ENOSYS; | |
725 | } | |
726 | } | |
727 | ||
728 | static const struct file_operations lttng_counter_fops = { | |
729 | .owner = THIS_MODULE, | |
730 | .release = lttng_counter_release, | |
731 | .unlocked_ioctl = lttng_counter_ioctl, | |
732 | #ifdef CONFIG_COMPAT | |
733 | .compat_ioctl = lttng_counter_ioctl, | |
734 | #endif | |
735 | }; | |
736 | ||
737 | ||
d1f652f8 MD |
738 | static |
739 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
740 | { | |
741 | switch (tracker->type) { | |
742 | case LTTNG_KERNEL_TRACKER_PID: | |
743 | return TRACKER_PID; | |
744 | case LTTNG_KERNEL_TRACKER_VPID: | |
745 | return TRACKER_VPID; | |
746 | case LTTNG_KERNEL_TRACKER_UID: | |
747 | return TRACKER_UID; | |
748 | case LTTNG_KERNEL_TRACKER_VUID: | |
749 | return TRACKER_VUID; | |
750 | case LTTNG_KERNEL_TRACKER_GID: | |
751 | return TRACKER_GID; | |
752 | case LTTNG_KERNEL_TRACKER_VGID: | |
753 | return TRACKER_VGID; | |
754 | default: | |
755 | return TRACKER_UNKNOWN; | |
756 | } | |
757 | } | |
758 | ||
baf20995 | 759 | /** |
ad1c05e1 | 760 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 761 | * |
c0e31d2e | 762 | * @file: the file |
baf20995 MD |
763 | * @cmd: the command |
764 | * @arg: command arg | |
765 | * | |
766 | * This ioctl implements lttng commands: | |
38d024ae | 767 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 768 | * Returns a LTTng channel file descriptor |
e64957da MD |
769 | * LTTNG_KERNEL_ENABLE |
770 | * Enables tracing for a session (weak enable) | |
771 | * LTTNG_KERNEL_DISABLE | |
772 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
773 | * LTTNG_KERNEL_METADATA |
774 | * Returns a LTTng metadata file descriptor | |
e0130fab | 775 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 776 | * Add PID to session PID tracker |
e0130fab | 777 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
778 | * Remove PID from session PID tracker |
779 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
780 | * Add ID to tracker | |
781 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
782 | * Remove ID from tracker | |
ad1c05e1 MD |
783 | * |
784 | * The returned channel will be deleted when its file descriptor is closed. | |
785 | */ | |
786 | static | |
c0e31d2e | 787 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 788 | { |
a90917c3 | 789 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
790 | struct lttng_kernel_channel chan_param; |
791 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 792 | |
ad1c05e1 | 793 | switch (cmd) { |
6dccd6c1 JD |
794 | case LTTNG_KERNEL_OLD_CHANNEL: |
795 | { | |
6dccd6c1 JD |
796 | if (copy_from_user(&old_chan_param, |
797 | (struct lttng_kernel_old_channel __user *) arg, | |
798 | sizeof(struct lttng_kernel_old_channel))) | |
799 | return -EFAULT; | |
800 | chan_param.overwrite = old_chan_param.overwrite; | |
801 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
802 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
803 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
804 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
805 | chan_param.output = old_chan_param.output; | |
806 | ||
807 | return lttng_abi_create_channel(file, &chan_param, | |
808 | PER_CPU_CHANNEL); | |
809 | } | |
38d024ae | 810 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 811 | { |
6dccd6c1 | 812 | if (copy_from_user(&chan_param, |
38d024ae | 813 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
814 | sizeof(struct lttng_kernel_channel))) |
815 | return -EFAULT; | |
816 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 817 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
818 | } |
819 | case LTTNG_KERNEL_OLD_SESSION_START: | |
820 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 821 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 822 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 823 | return lttng_session_enable(session); |
6dccd6c1 JD |
824 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
825 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 826 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 827 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 828 | return lttng_session_disable(session); |
6dccd6c1 JD |
829 | case LTTNG_KERNEL_OLD_METADATA: |
830 | { | |
6dccd6c1 JD |
831 | if (copy_from_user(&old_chan_param, |
832 | (struct lttng_kernel_old_channel __user *) arg, | |
833 | sizeof(struct lttng_kernel_old_channel))) | |
834 | return -EFAULT; | |
835 | chan_param.overwrite = old_chan_param.overwrite; | |
836 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
837 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
838 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
839 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
840 | chan_param.output = old_chan_param.output; | |
841 | ||
842 | return lttng_abi_create_channel(file, &chan_param, | |
843 | METADATA_CHANNEL); | |
844 | } | |
38d024ae | 845 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 846 | { |
6dccd6c1 JD |
847 | if (copy_from_user(&chan_param, |
848 | (struct lttng_kernel_channel __user *) arg, | |
849 | sizeof(struct lttng_kernel_channel))) | |
850 | return -EFAULT; | |
851 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 852 | METADATA_CHANNEL); |
6dccd6c1 | 853 | } |
e0130fab | 854 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 855 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 856 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
857 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
858 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
859 | { | |
860 | struct lttng_kernel_tracker_args tracker; | |
861 | enum tracker_type tracker_type; | |
862 | ||
863 | if (copy_from_user(&tracker, | |
864 | (struct lttng_kernel_tracker_args __user *) arg, | |
865 | sizeof(struct lttng_kernel_tracker_args))) | |
866 | return -EFAULT; | |
867 | tracker_type = get_tracker_type(&tracker); | |
868 | if (tracker_type == TRACKER_UNKNOWN) | |
869 | return -EINVAL; | |
870 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
871 | } | |
872 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
873 | { | |
874 | struct lttng_kernel_tracker_args tracker; | |
875 | enum tracker_type tracker_type; | |
876 | ||
877 | if (copy_from_user(&tracker, | |
878 | (struct lttng_kernel_tracker_args __user *) arg, | |
879 | sizeof(struct lttng_kernel_tracker_args))) | |
880 | return -EFAULT; | |
881 | tracker_type = get_tracker_type(&tracker); | |
882 | if (tracker_type == TRACKER_UNKNOWN) | |
883 | return -EINVAL; | |
884 | return lttng_session_untrack_id(session, tracker_type, | |
885 | tracker.id); | |
886 | } | |
7e6f9ef6 | 887 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
888 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
889 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
890 | { | |
891 | struct lttng_kernel_tracker_args tracker; | |
892 | enum tracker_type tracker_type; | |
893 | ||
894 | if (copy_from_user(&tracker, | |
895 | (struct lttng_kernel_tracker_args __user *) arg, | |
896 | sizeof(struct lttng_kernel_tracker_args))) | |
897 | return -EFAULT; | |
898 | tracker_type = get_tracker_type(&tracker); | |
899 | if (tracker_type == TRACKER_UNKNOWN) | |
900 | return -EINVAL; | |
901 | return lttng_session_list_tracker_ids(session, tracker_type); | |
902 | } | |
9616f0bf JD |
903 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
904 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
905 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
906 | return lttng_session_statedump(session); | |
7f859fbf JR |
907 | case LTTNG_KERNEL_SESSION_SET_NAME: |
908 | { | |
909 | struct lttng_kernel_session_name name; | |
910 | ||
911 | if (copy_from_user(&name, | |
912 | (struct lttng_kernel_session_name __user *) arg, | |
913 | sizeof(struct lttng_kernel_session_name))) | |
914 | return -EFAULT; | |
915 | return lttng_abi_session_set_name(session, &name); | |
916 | } | |
1c88f269 JR |
917 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
918 | { | |
919 | struct lttng_kernel_session_creation_time time; | |
920 | ||
921 | if (copy_from_user(&time, | |
922 | (struct lttng_kernel_session_creation_time __user *) arg, | |
923 | sizeof(struct lttng_kernel_session_creation_time))) | |
924 | return -EFAULT; | |
925 | return lttng_abi_session_set_creation_time(session, &time); | |
926 | } | |
ad1c05e1 MD |
927 | default: |
928 | return -ENOIOCTLCMD; | |
929 | } | |
930 | } | |
931 | ||
03037b98 MD |
932 | /* |
933 | * Called when the last file reference is dropped. | |
934 | * | |
935 | * Big fat note: channels and events are invariant for the whole session after | |
936 | * their creation. So this session destruction also destroys all channel and | |
937 | * event structures specific to this session (they are not destroyed when their | |
938 | * individual file is released). | |
939 | */ | |
ad1c05e1 | 940 | static |
03037b98 | 941 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 942 | { |
a90917c3 | 943 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
944 | |
945 | if (session) | |
a90917c3 | 946 | lttng_session_destroy(session); |
11b5a3c2 | 947 | return 0; |
ad1c05e1 | 948 | } |
ad1c05e1 MD |
949 | |
950 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 951 | .owner = THIS_MODULE, |
03037b98 | 952 | .release = lttng_session_release, |
ad1c05e1 MD |
953 | .unlocked_ioctl = lttng_session_ioctl, |
954 | #ifdef CONFIG_COMPAT | |
03037b98 | 955 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 956 | #endif |
11b5a3c2 | 957 | }; |
ad1c05e1 | 958 | |
db2511b4 MD |
959 | /* |
960 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
961 | * and retry (if new data available to read after flush). | |
962 | */ | |
963 | static | |
964 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
965 | size_t count, loff_t *ppos) | |
966 | { | |
967 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
968 | struct channel *chan = event_notifier_group->chan; | |
969 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
970 | ssize_t read_count = 0, len; | |
971 | size_t read_offset; | |
972 | ||
973 | might_sleep(); | |
974 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
975 | return -EFAULT; | |
976 | ||
977 | /* Finish copy of previous record */ | |
978 | if (*ppos != 0) { | |
979 | if (read_count < count) { | |
980 | len = chan->iter.len_left; | |
981 | read_offset = *ppos; | |
982 | goto skip_get_next; | |
983 | } | |
984 | } | |
985 | ||
986 | while (read_count < count) { | |
987 | size_t copy_len, space_left; | |
988 | ||
989 | len = lib_ring_buffer_get_next_record(chan, buf); | |
990 | len_test: | |
991 | if (len < 0) { | |
992 | /* | |
993 | * Check if buffer is finalized (end of file). | |
994 | */ | |
995 | if (len == -ENODATA) { | |
996 | /* A 0 read_count will tell about end of file */ | |
997 | goto nodata; | |
998 | } | |
999 | if (filp->f_flags & O_NONBLOCK) { | |
1000 | if (!read_count) | |
1001 | read_count = -EAGAIN; | |
1002 | goto nodata; | |
1003 | } else { | |
1004 | int error; | |
1005 | ||
1006 | /* | |
1007 | * No data available at the moment, return what | |
1008 | * we got. | |
1009 | */ | |
1010 | if (read_count) | |
1011 | goto nodata; | |
1012 | ||
1013 | /* | |
1014 | * Wait for returned len to be >= 0 or -ENODATA. | |
1015 | */ | |
1016 | error = wait_event_interruptible( | |
1017 | event_notifier_group->read_wait, | |
1018 | ((len = lib_ring_buffer_get_next_record( | |
1019 | chan, buf)), len != -EAGAIN)); | |
1020 | CHAN_WARN_ON(chan, len == -EBUSY); | |
1021 | if (error) { | |
1022 | read_count = error; | |
1023 | goto nodata; | |
1024 | } | |
1025 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
1026 | goto len_test; | |
1027 | } | |
1028 | } | |
1029 | read_offset = buf->iter.read_offset; | |
1030 | skip_get_next: | |
1031 | space_left = count - read_count; | |
1032 | if (len <= space_left) { | |
1033 | copy_len = len; | |
1034 | chan->iter.len_left = 0; | |
1035 | *ppos = 0; | |
1036 | } else { | |
1037 | copy_len = space_left; | |
1038 | chan->iter.len_left = len - copy_len; | |
1039 | *ppos = read_offset + copy_len; | |
1040 | } | |
1041 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
1042 | &user_buf[read_count], | |
1043 | copy_len)) { | |
1044 | /* | |
1045 | * Leave the len_left and ppos values at their current | |
1046 | * state, as we currently have a valid event to read. | |
1047 | */ | |
1048 | return -EFAULT; | |
1049 | } | |
1050 | read_count += copy_len; | |
1051 | } | |
31c02fb7 | 1052 | goto put_record; |
db2511b4 MD |
1053 | |
1054 | nodata: | |
1055 | *ppos = 0; | |
1056 | chan->iter.len_left = 0; | |
31c02fb7 MD |
1057 | |
1058 | put_record: | |
1059 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1060 | return read_count; |
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1065 | * there is data available. Perform a ring buffer flush if we encounter a | |
1066 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1067 | */ | |
1068 | static | |
1069 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1070 | poll_table *wait) | |
1071 | { | |
1072 | unsigned int mask = 0; | |
1073 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
1074 | struct channel *chan = event_notifier_group->chan; | |
1075 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1076 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1077 | int finalized, disabled; | |
1078 | unsigned long consumed, offset; | |
18f12d55 | 1079 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1080 | |
1081 | if (filp->f_mode & FMODE_READ) { | |
1082 | poll_wait_set_exclusive(wait); | |
1083 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1084 | ||
1085 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1086 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1087 | ||
1088 | /* | |
1089 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1090 | * finalized load before offsets loads. | |
1091 | */ | |
1092 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1093 | retry: | |
1094 | if (disabled) | |
1095 | return POLLERR; | |
1096 | ||
1097 | offset = lib_ring_buffer_get_offset(config, buf); | |
1098 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1099 | ||
1100 | /* | |
1101 | * If there is no buffer available to consume. | |
1102 | */ | |
1103 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1104 | /* | |
1105 | * If there is a non-empty subbuffer, flush and try again. | |
1106 | */ | |
18f12d55 | 1107 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1108 | lib_ring_buffer_switch_remote(buf); |
1109 | goto retry; | |
1110 | } | |
1111 | ||
1112 | if (finalized) | |
1113 | return POLLHUP; | |
1114 | else { | |
1115 | /* | |
1116 | * The memory barriers | |
1117 | * __wait_event()/wake_up_interruptible() take | |
1118 | * care of "raw_spin_is_locked" memory ordering. | |
1119 | */ | |
1120 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1121 | goto retry; | |
1122 | else | |
1123 | return 0; | |
1124 | } | |
1125 | } else { | |
1126 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1127 | >= chan->backend.buf_size) | |
1128 | return POLLPRI | POLLRDBAND; | |
1129 | else | |
1130 | return POLLIN | POLLRDNORM; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | return mask; | |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1139 | * @inode: opened inode | |
1140 | * @file: opened file | |
1141 | * | |
1142 | * Open implementation. Makes sure only one open instance of a buffer is | |
1143 | * done at a given moment. | |
1144 | */ | |
1145 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1146 | { | |
1147 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
1148 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1149 | ||
1150 | file->private_data = event_notifier_group; | |
1151 | return lib_ring_buffer_open(inode, file, buf); | |
1152 | } | |
1153 | ||
1154 | /** | |
1155 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1156 | * @inode: opened inode | |
1157 | * @file: opened file | |
1158 | * | |
1159 | * Release implementation. | |
1160 | */ | |
1161 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1162 | { | |
1163 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
1164 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1165 | int ret; | |
1166 | ||
1167 | ret = lib_ring_buffer_release(inode, file, buf); | |
1168 | if (ret) | |
1169 | return ret; | |
1170 | fput(event_notifier_group->file); | |
1171 | return 0; | |
1172 | } | |
1173 | ||
21f58fb7 FD |
1174 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1175 | .owner = THIS_MODULE, | |
db2511b4 MD |
1176 | .open = lttng_event_notifier_group_notif_open, |
1177 | .release = lttng_event_notifier_group_notif_release, | |
1178 | .read = lttng_event_notifier_group_notif_read, | |
1179 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1180 | }; |
1181 | ||
d83004aa JD |
1182 | /** |
1183 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1184 | * @filp: the file | |
1185 | * @wait: poll table | |
1186 | * | |
1187 | * Handles the poll operations for the metadata channels. | |
1188 | */ | |
ad1c05e1 | 1189 | static |
d83004aa JD |
1190 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1191 | poll_table *wait) | |
1192 | { | |
1193 | struct lttng_metadata_stream *stream = filp->private_data; | |
1194 | struct lib_ring_buffer *buf = stream->priv; | |
1195 | int finalized; | |
1196 | unsigned int mask = 0; | |
1197 | ||
1198 | if (filp->f_mode & FMODE_READ) { | |
1199 | poll_wait_set_exclusive(wait); | |
1200 | poll_wait(filp, &stream->read_wait, wait); | |
1201 | ||
1202 | finalized = stream->finalized; | |
1203 | ||
1204 | /* | |
1205 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1206 | * ordering finalized load before offsets loads. | |
1207 | */ | |
1208 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1209 | ||
1210 | if (finalized) | |
1211 | mask |= POLLHUP; | |
1212 | ||
92d9f5e6 | 1213 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1214 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1215 | stream->metadata_out) |
d83004aa | 1216 | mask |= POLLIN; |
92d9f5e6 | 1217 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1218 | } |
1219 | ||
1220 | return mask; | |
1221 | } | |
1222 | ||
f613e3e6 MD |
1223 | static |
1224 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1225 | unsigned int cmd, unsigned long arg) | |
1226 | { | |
1227 | struct lttng_metadata_stream *stream = filp->private_data; | |
1228 | ||
1229 | stream->metadata_out = stream->metadata_in; | |
1230 | } | |
1231 | ||
d1344afa JD |
1232 | /* |
1233 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1234 | * the consumer receives the content of the metadata cache unchanged. This is | |
1235 | * different from the metadata_regenerate where the offset from epoch is | |
1236 | * resampled, here we want the exact same content as the last time the metadata | |
1237 | * was generated. This command is only possible if all the metadata written | |
1238 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1239 | * metadata file. | |
1240 | * | |
1241 | * Return 0 on success, a negative value on error. | |
1242 | */ | |
1243 | static | |
1244 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1245 | { | |
1246 | int ret; | |
1247 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1248 | ||
1249 | mutex_lock(&cache->lock); | |
1250 | if (stream->metadata_out != cache->metadata_written) { | |
1251 | ret = -EBUSY; | |
1252 | goto end; | |
1253 | } | |
1254 | stream->metadata_out = 0; | |
1255 | stream->metadata_in = 0; | |
1256 | wake_up_interruptible(&stream->read_wait); | |
1257 | ret = 0; | |
1258 | ||
1259 | end: | |
1260 | mutex_unlock(&cache->lock); | |
1261 | return ret; | |
1262 | } | |
1263 | ||
d83004aa JD |
1264 | static |
1265 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1266 | unsigned int cmd, unsigned long arg) | |
1267 | { | |
1268 | int ret; | |
1269 | struct lttng_metadata_stream *stream = filp->private_data; | |
1270 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1271 | unsigned int rb_cmd; |
1272 | bool coherent; | |
1273 | ||
1274 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1275 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1276 | else | |
1277 | rb_cmd = cmd; | |
d83004aa JD |
1278 | |
1279 | switch (cmd) { | |
d83004aa JD |
1280 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1281 | { | |
35097f36 JD |
1282 | struct lttng_metadata_stream *stream = filp->private_data; |
1283 | struct lib_ring_buffer *buf = stream->priv; | |
1284 | struct channel *chan = buf->backend.chan; | |
1285 | ||
8b97fd42 | 1286 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1287 | if (ret > 0) { |
1288 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1289 | ret = 0; | |
1290 | } else if (ret < 0) | |
d83004aa JD |
1291 | goto err; |
1292 | break; | |
1293 | } | |
f613e3e6 MD |
1294 | case RING_BUFFER_GET_SUBBUF: |
1295 | { | |
1296 | /* | |
1297 | * Random access is not allowed for metadata channel. | |
1298 | */ | |
1299 | return -ENOSYS; | |
1300 | } | |
c6f05468 | 1301 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
1302 | case RING_BUFFER_FLUSH: |
1303 | { | |
1304 | struct lttng_metadata_stream *stream = filp->private_data; | |
1305 | struct lib_ring_buffer *buf = stream->priv; | |
1306 | struct channel *chan = buf->backend.chan; | |
1307 | ||
1308 | /* | |
1309 | * Before doing the actual ring buffer flush, write up to one | |
1310 | * packet of metadata in the ring buffer. | |
1311 | */ | |
8b97fd42 | 1312 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1313 | if (ret < 0) |
1314 | goto err; | |
1315 | break; | |
1316 | } | |
9616f0bf JD |
1317 | case RING_BUFFER_GET_METADATA_VERSION: |
1318 | { | |
1319 | struct lttng_metadata_stream *stream = filp->private_data; | |
1320 | ||
1321 | return put_u64(stream->version, arg); | |
1322 | } | |
d1344afa JD |
1323 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1324 | { | |
1325 | struct lttng_metadata_stream *stream = filp->private_data; | |
1326 | ||
1327 | return lttng_metadata_cache_dump(stream); | |
1328 | } | |
8b97fd42 MD |
1329 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1330 | { | |
1331 | struct lttng_metadata_stream *stream = filp->private_data; | |
1332 | struct lib_ring_buffer *buf = stream->priv; | |
1333 | struct channel *chan = buf->backend.chan; | |
1334 | ||
1335 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1336 | if (ret > 0) { | |
1337 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1338 | ret = 0; | |
1339 | } else if (ret < 0) { | |
1340 | goto err; | |
1341 | } | |
1342 | break; | |
1343 | } | |
d83004aa JD |
1344 | default: |
1345 | break; | |
1346 | } | |
f613e3e6 MD |
1347 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1348 | ||
d83004aa | 1349 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1350 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1351 | if (ret < 0) |
1352 | goto err; | |
d83004aa | 1353 | |
f613e3e6 MD |
1354 | switch (cmd) { |
1355 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1356 | { | |
1357 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1358 | cmd, arg); | |
1359 | break; | |
1360 | } | |
8b97fd42 MD |
1361 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1362 | { | |
1363 | return put_u32(coherent, arg); | |
1364 | } | |
f613e3e6 MD |
1365 | default: |
1366 | break; | |
1367 | } | |
d83004aa JD |
1368 | err: |
1369 | return ret; | |
1370 | } | |
1371 | ||
aeb9064d | 1372 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1373 | static |
1374 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1375 | unsigned int cmd, unsigned long arg) | |
1376 | { | |
1377 | int ret; | |
1378 | struct lttng_metadata_stream *stream = filp->private_data; | |
1379 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1380 | unsigned int rb_cmd; |
1381 | bool coherent; | |
1382 | ||
1383 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1384 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1385 | else | |
1386 | rb_cmd = cmd; | |
d83004aa JD |
1387 | |
1388 | switch (cmd) { | |
d83004aa JD |
1389 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1390 | { | |
35097f36 JD |
1391 | struct lttng_metadata_stream *stream = filp->private_data; |
1392 | struct lib_ring_buffer *buf = stream->priv; | |
1393 | struct channel *chan = buf->backend.chan; | |
1394 | ||
8b97fd42 | 1395 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1396 | if (ret > 0) { |
1397 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1398 | ret = 0; | |
1399 | } else if (ret < 0) | |
d83004aa JD |
1400 | goto err; |
1401 | break; | |
1402 | } | |
f613e3e6 MD |
1403 | case RING_BUFFER_GET_SUBBUF: |
1404 | { | |
1405 | /* | |
1406 | * Random access is not allowed for metadata channel. | |
1407 | */ | |
1408 | return -ENOSYS; | |
1409 | } | |
c6f05468 | 1410 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1411 | case RING_BUFFER_FLUSH: |
1412 | { | |
1413 | struct lttng_metadata_stream *stream = filp->private_data; | |
1414 | struct lib_ring_buffer *buf = stream->priv; | |
1415 | struct channel *chan = buf->backend.chan; | |
1416 | ||
1417 | /* | |
1418 | * Before doing the actual ring buffer flush, write up to one | |
1419 | * packet of metadata in the ring buffer. | |
1420 | */ | |
8b97fd42 | 1421 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1422 | if (ret < 0) |
1423 | goto err; | |
1424 | break; | |
1425 | } | |
1426 | case RING_BUFFER_GET_METADATA_VERSION: | |
1427 | { | |
1428 | struct lttng_metadata_stream *stream = filp->private_data; | |
1429 | ||
1430 | return put_u64(stream->version, arg); | |
1431 | } | |
d1344afa JD |
1432 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1433 | { | |
1434 | struct lttng_metadata_stream *stream = filp->private_data; | |
1435 | ||
1436 | return lttng_metadata_cache_dump(stream); | |
1437 | } | |
8b97fd42 MD |
1438 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1439 | { | |
1440 | struct lttng_metadata_stream *stream = filp->private_data; | |
1441 | struct lib_ring_buffer *buf = stream->priv; | |
1442 | struct channel *chan = buf->backend.chan; | |
1443 | ||
1444 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1445 | if (ret > 0) { | |
1446 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1447 | ret = 0; | |
1448 | } else if (ret < 0) { | |
1449 | goto err; | |
1450 | } | |
1451 | break; | |
1452 | } | |
d83004aa JD |
1453 | default: |
1454 | break; | |
1455 | } | |
f613e3e6 MD |
1456 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1457 | ||
d83004aa | 1458 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1459 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1460 | if (ret < 0) |
1461 | goto err; | |
d83004aa | 1462 | |
f613e3e6 MD |
1463 | switch (cmd) { |
1464 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1465 | { | |
1466 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1467 | cmd, arg); | |
1468 | break; | |
1469 | } | |
8b97fd42 MD |
1470 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1471 | { | |
1472 | return put_u32(coherent, arg); | |
1473 | } | |
f613e3e6 MD |
1474 | default: |
1475 | break; | |
1476 | } | |
d83004aa JD |
1477 | err: |
1478 | return ret; | |
1479 | } | |
aeb9064d | 1480 | #endif |
d83004aa | 1481 | |
b3b8072b MD |
1482 | /* |
1483 | * This is not used by anonymous file descriptors. This code is left | |
1484 | * there if we ever want to implement an inode with open() operation. | |
1485 | */ | |
d83004aa JD |
1486 | static |
1487 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1488 | { | |
1489 | struct lttng_metadata_stream *stream = inode->i_private; | |
1490 | struct lib_ring_buffer *buf = stream->priv; | |
1491 | ||
1492 | file->private_data = buf; | |
b3b8072b MD |
1493 | /* |
1494 | * Since life-time of metadata cache differs from that of | |
1495 | * session, we need to keep our own reference on the transport. | |
1496 | */ | |
1497 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1498 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1499 | return -EBUSY; |
1500 | } | |
d83004aa JD |
1501 | return lib_ring_buffer_open(inode, file, buf); |
1502 | } | |
1503 | ||
1504 | static | |
1505 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1506 | { | |
1507 | struct lttng_metadata_stream *stream = file->private_data; | |
1508 | struct lib_ring_buffer *buf = stream->priv; | |
1509 | ||
92143b2c MD |
1510 | mutex_lock(&stream->metadata_cache->lock); |
1511 | list_del(&stream->list); | |
1512 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1513 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1514 | module_put(stream->transport->owner); |
92143b2c | 1515 | kfree(stream); |
d83004aa JD |
1516 | return lib_ring_buffer_release(inode, file, buf); |
1517 | } | |
1518 | ||
1519 | static | |
1520 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1521 | struct pipe_inode_info *pipe, size_t len, | |
1522 | unsigned int flags) | |
1523 | { | |
1524 | struct lttng_metadata_stream *stream = in->private_data; | |
1525 | struct lib_ring_buffer *buf = stream->priv; | |
1526 | ||
1527 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1528 | flags, buf); | |
1529 | } | |
1530 | ||
1531 | static | |
1532 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1533 | struct vm_area_struct *vma) | |
1534 | { | |
1535 | struct lttng_metadata_stream *stream = filp->private_data; | |
1536 | struct lib_ring_buffer *buf = stream->priv; | |
1537 | ||
1538 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1539 | } | |
1540 | ||
1541 | static | |
1542 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1543 | .owner = THIS_MODULE, | |
1544 | .open = lttng_metadata_ring_buffer_open, | |
1545 | .release = lttng_metadata_ring_buffer_release, | |
1546 | .poll = lttng_metadata_ring_buffer_poll, | |
1547 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1548 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1549 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1550 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1551 | #ifdef CONFIG_COMPAT | |
1552 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1553 | #endif | |
1554 | }; | |
1555 | ||
1556 | static | |
1557 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1558 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1559 | { |
ad1c05e1 | 1560 | int stream_fd, ret; |
11b5a3c2 | 1561 | struct file *stream_file; |
ad1c05e1 | 1562 | |
4ac10b76 | 1563 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1564 | if (stream_fd < 0) { |
1565 | ret = stream_fd; | |
1566 | goto fd_error; | |
1567 | } | |
a3fcd499 | 1568 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1569 | if (IS_ERR(stream_file)) { |
1570 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1571 | goto file_error; |
1572 | } | |
409453cb MD |
1573 | /* |
1574 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1575 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1576 | * file descriptor, so we set FMODE_PREAD here. | |
1577 | */ | |
d7b6f197 | 1578 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1579 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1580 | /* |
1581 | * The stream holds a reference to the channel within the generic ring | |
1582 | * buffer library, so no need to hold a refcount on the channel and | |
1583 | * session files here. | |
1584 | */ | |
ad1c05e1 MD |
1585 | return stream_fd; |
1586 | ||
1587 | file_error: | |
1588 | put_unused_fd(stream_fd); | |
d83004aa JD |
1589 | fd_error: |
1590 | return ret; | |
1591 | } | |
1592 | ||
1593 | static | |
1594 | int lttng_abi_open_stream(struct file *channel_file) | |
1595 | { | |
1596 | struct lttng_channel *channel = channel_file->private_data; | |
1597 | struct lib_ring_buffer *buf; | |
1598 | int ret; | |
1599 | void *stream_priv; | |
1600 | ||
1601 | buf = channel->ops->buffer_read_open(channel->chan); | |
1602 | if (!buf) | |
1603 | return -ENOENT; | |
1604 | ||
1605 | stream_priv = buf; | |
1606 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1607 | <tng_stream_ring_buffer_file_operations, |
1608 | "[lttng_stream]"); | |
d83004aa JD |
1609 | if (ret < 0) |
1610 | goto fd_error; | |
1611 | ||
1612 | return ret; | |
1613 | ||
1614 | fd_error: | |
1615 | channel->ops->buffer_read_close(buf); | |
1616 | return ret; | |
1617 | } | |
1618 | ||
1619 | static | |
1620 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1621 | { | |
1622 | struct lttng_channel *channel = channel_file->private_data; | |
1623 | struct lttng_session *session = channel->session; | |
1624 | struct lib_ring_buffer *buf; | |
1625 | int ret; | |
1626 | struct lttng_metadata_stream *metadata_stream; | |
1627 | void *stream_priv; | |
1628 | ||
1629 | buf = channel->ops->buffer_read_open(channel->chan); | |
1630 | if (!buf) | |
1631 | return -ENOENT; | |
1632 | ||
1633 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1634 | GFP_KERNEL); | |
b3b8072b MD |
1635 | if (!metadata_stream) { |
1636 | ret = -ENOMEM; | |
1637 | goto nomem; | |
1638 | } | |
d83004aa JD |
1639 | metadata_stream->metadata_cache = session->metadata_cache; |
1640 | init_waitqueue_head(&metadata_stream->read_wait); | |
1641 | metadata_stream->priv = buf; | |
1642 | stream_priv = metadata_stream; | |
b3b8072b | 1643 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
1644 | /* Initial state is an empty metadata, considered as incoherent. */ |
1645 | metadata_stream->coherent = false; | |
b3b8072b MD |
1646 | |
1647 | /* | |
1648 | * Since life-time of metadata cache differs from that of | |
1649 | * session, we need to keep our own reference on the transport. | |
1650 | */ | |
1651 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1652 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1653 | ret = -EINVAL; |
1654 | goto notransport; | |
1655 | } | |
1656 | ||
901aaa5f FD |
1657 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1658 | ret = -EOVERFLOW; | |
9c1f4643 | 1659 | goto kref_error; |
901aaa5f FD |
1660 | } |
1661 | ||
d83004aa | 1662 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1663 | <tng_metadata_ring_buffer_file_operations, |
1664 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1665 | if (ret < 0) |
1666 | goto fd_error; | |
1667 | ||
92143b2c | 1668 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1669 | list_add(&metadata_stream->list, |
1670 | &session->metadata_cache->metadata_stream); | |
92143b2c | 1671 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1672 | return ret; |
1673 | ||
ad1c05e1 | 1674 | fd_error: |
9c1f4643 MD |
1675 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1676 | kref_error: | |
b3b8072b MD |
1677 | module_put(metadata_stream->transport->owner); |
1678 | notransport: | |
1679 | kfree(metadata_stream); | |
1680 | nomem: | |
11b5a3c2 | 1681 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1682 | return ret; |
1683 | } | |
1684 | ||
21f58fb7 FD |
1685 | static |
1686 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1687 | { | |
1688 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
1689 | struct channel *chan = event_notifier_group->chan; | |
1690 | struct lib_ring_buffer *buf; | |
1691 | int ret; | |
1692 | void *stream_priv; | |
1693 | ||
1694 | buf = event_notifier_group->ops->buffer_read_open(chan); | |
1695 | if (!buf) | |
1696 | return -ENOENT; | |
1697 | ||
1698 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1699 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1700 | ret = -EOVERFLOW; | |
1701 | goto refcount_error; | |
1702 | } | |
1703 | event_notifier_group->buf = buf; | |
1704 | stream_priv = event_notifier_group; | |
1705 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1706 | <tng_event_notifier_group_notif_fops, | |
1707 | "[lttng_event_notifier_stream]"); | |
1708 | if (ret < 0) | |
1709 | goto fd_error; | |
1710 | ||
1711 | return ret; | |
1712 | ||
1713 | fd_error: | |
1714 | atomic_long_dec(¬if_file->f_count); | |
1715 | refcount_error: | |
1716 | event_notifier_group->ops->buffer_read_close(buf); | |
1717 | return ret; | |
1718 | } | |
1719 | ||
badfe9f5 MD |
1720 | static |
1721 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
1722 | { | |
1723 | /* Limit ABI to implemented features. */ | |
1724 | switch (event_param->instrumentation) { | |
1725 | case LTTNG_KERNEL_SYSCALL: | |
1726 | switch (event_param->u.syscall.entryexit) { | |
c5d12b5b FD |
1727 | case LTTNG_KERNEL_SYSCALL_ENTRY: |
1728 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
badfe9f5 MD |
1729 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: |
1730 | break; | |
1731 | default: | |
1732 | return -EINVAL; | |
1733 | } | |
1734 | switch (event_param->u.syscall.abi) { | |
1735 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1736 | break; | |
1737 | default: | |
1738 | return -EINVAL; | |
1739 | } | |
1740 | switch (event_param->u.syscall.match) { | |
cff6938b | 1741 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
badfe9f5 MD |
1742 | break; |
1743 | default: | |
1744 | return -EINVAL; | |
1745 | } | |
1746 | break; | |
1747 | ||
1748 | case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */ | |
1749 | case LTTNG_KERNEL_KPROBE: /* Fallthrough */ | |
1750 | case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */ | |
1751 | case LTTNG_KERNEL_NOOP: /* Fallthrough */ | |
1752 | case LTTNG_KERNEL_UPROBE: | |
1753 | break; | |
1754 | ||
1755 | case LTTNG_KERNEL_FUNCTION: /* Fallthrough */ | |
1756 | default: | |
1757 | return -EINVAL; | |
1758 | } | |
1759 | return 0; | |
1760 | } | |
1761 | ||
653fe716 | 1762 | static |
c0e31d2e | 1763 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1764 | struct lttng_kernel_event *event_param) |
653fe716 | 1765 | { |
a90917c3 | 1766 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1767 | int event_fd, ret; |
11b5a3c2 | 1768 | struct file *event_file; |
3c997079 | 1769 | void *priv; |
653fe716 | 1770 | |
6dccd6c1 JD |
1771 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1772 | switch (event_param->instrumentation) { | |
7371f44c | 1773 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1774 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1775 | break; |
ab2277d6 | 1776 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1777 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1778 | break; |
ab2277d6 | 1779 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1780 | WARN_ON_ONCE(1); |
1781 | /* Not implemented. */ | |
e0a7a7c4 MD |
1782 | break; |
1783 | default: | |
1784 | break; | |
1785 | } | |
33a39a3c MD |
1786 | event_fd = lttng_get_unused_fd(); |
1787 | if (event_fd < 0) { | |
1788 | ret = event_fd; | |
1789 | goto fd_error; | |
1790 | } | |
1791 | event_file = anon_inode_getfile("[lttng_event]", | |
1792 | <tng_event_fops, | |
1793 | NULL, O_RDWR); | |
1794 | if (IS_ERR(event_file)) { | |
1795 | ret = PTR_ERR(event_file); | |
1796 | goto file_error; | |
1797 | } | |
9c1f4643 | 1798 | /* The event holds a reference on the channel */ |
98d7281c | 1799 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1800 | ret = -EOVERFLOW; |
9c1f4643 MD |
1801 | goto refcount_error; |
1802 | } | |
badfe9f5 MD |
1803 | ret = lttng_abi_validate_event_param(event_param); |
1804 | if (ret) | |
1805 | goto event_error; | |
33a39a3c MD |
1806 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1807 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
b2bc0bc8 | 1808 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1809 | |
4993071a PP |
1810 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1811 | /* | |
1812 | * If the event name is a star globbing pattern, | |
1813 | * we create the special star globbing enabler. | |
1814 | */ | |
b2bc0bc8 | 1815 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1816 | event_param, channel); |
3c997079 | 1817 | } else { |
b2bc0bc8 | 1818 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1819 | event_param, channel); |
1ec65de1 | 1820 | } |
b2bc0bc8 | 1821 | priv = event_enabler; |
33a39a3c MD |
1822 | } else { |
1823 | struct lttng_event *event; | |
4ee2453d | 1824 | |
33a39a3c MD |
1825 | /* |
1826 | * We tolerate no failure path after event creation. It | |
1827 | * will stay invariant for the rest of the session. | |
1828 | */ | |
1829 | event = lttng_event_create(channel, event_param, | |
1830 | NULL, NULL, | |
1831 | event_param->instrumentation); | |
1832 | WARN_ON_ONCE(!event); | |
1833 | if (IS_ERR(event)) { | |
1834 | ret = PTR_ERR(event); | |
1835 | goto event_error; | |
80f87dd2 | 1836 | } |
33a39a3c | 1837 | priv = event; |
03037b98 | 1838 | } |
33a39a3c MD |
1839 | event_file->private_data = priv; |
1840 | fd_install(event_fd, event_file); | |
653fe716 MD |
1841 | return event_fd; |
1842 | ||
03037b98 | 1843 | event_error: |
9c1f4643 MD |
1844 | atomic_long_dec(&channel_file->f_count); |
1845 | refcount_error: | |
c0e31d2e | 1846 | fput(event_file); |
653fe716 MD |
1847 | file_error: |
1848 | put_unused_fd(event_fd); | |
1849 | fd_error: | |
653fe716 MD |
1850 | return ret; |
1851 | } | |
ad1c05e1 | 1852 | |
dffef45d FD |
1853 | static |
1854 | long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1855 | { | |
2b16f0c9 | 1856 | struct lttng_event_notifier *event_notifier; |
dffef45d FD |
1857 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
1858 | enum lttng_event_type *evtype = file->private_data; | |
1859 | ||
1860 | switch (cmd) { | |
1861 | case LTTNG_KERNEL_ENABLE: | |
1862 | switch (*evtype) { | |
1863 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
1864 | event_notifier = file->private_data; |
1865 | return lttng_event_notifier_enable(event_notifier); | |
dffef45d FD |
1866 | case LTTNG_TYPE_ENABLER: |
1867 | event_notifier_enabler = file->private_data; | |
1868 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
1869 | default: | |
1870 | WARN_ON_ONCE(1); | |
1871 | return -ENOSYS; | |
1872 | } | |
1873 | case LTTNG_KERNEL_DISABLE: | |
1874 | switch (*evtype) { | |
1875 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
1876 | event_notifier = file->private_data; |
1877 | return lttng_event_notifier_disable(event_notifier); | |
dffef45d FD |
1878 | case LTTNG_TYPE_ENABLER: |
1879 | event_notifier_enabler = file->private_data; | |
1880 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
1881 | default: | |
1882 | WARN_ON_ONCE(1); | |
1883 | return -ENOSYS; | |
1884 | } | |
1885 | case LTTNG_KERNEL_FILTER: | |
1886 | switch (*evtype) { | |
1887 | case LTTNG_TYPE_EVENT: | |
1888 | return -EINVAL; | |
1889 | case LTTNG_TYPE_ENABLER: | |
1890 | event_notifier_enabler = file->private_data; | |
183e8b3a FD |
1891 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
1892 | event_notifier_enabler, | |
dffef45d FD |
1893 | (struct lttng_kernel_filter_bytecode __user *) arg); |
1894 | default: | |
1895 | WARN_ON_ONCE(1); | |
1896 | return -ENOSYS; | |
1897 | } | |
99d223ad FD |
1898 | |
1899 | case LTTNG_KERNEL_CAPTURE: | |
1900 | switch (*evtype) { | |
1901 | case LTTNG_TYPE_EVENT: | |
1902 | return -EINVAL; | |
1903 | case LTTNG_TYPE_ENABLER: | |
1904 | event_notifier_enabler = file->private_data; | |
1905 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
1906 | event_notifier_enabler, | |
1907 | (struct lttng_kernel_capture_bytecode __user *) arg); | |
1908 | default: | |
1909 | WARN_ON_ONCE(1); | |
1910 | return -ENOSYS; | |
1911 | } | |
9de67196 FD |
1912 | case LTTNG_KERNEL_ADD_CALLSITE: |
1913 | switch (*evtype) { | |
1914 | case LTTNG_TYPE_EVENT: | |
1915 | event_notifier = file->private_data; | |
1916 | return lttng_event_notifier_add_callsite(event_notifier, | |
1917 | (struct lttng_kernel_event_callsite __user *) arg); | |
1918 | case LTTNG_TYPE_ENABLER: | |
1919 | return -EINVAL; | |
1920 | default: | |
1921 | WARN_ON_ONCE(1); | |
1922 | return -ENOSYS; | |
1923 | } | |
dffef45d FD |
1924 | default: |
1925 | return -ENOIOCTLCMD; | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | static | |
1930 | int lttng_event_notifier_release(struct inode *inode, struct file *file) | |
1931 | { | |
1932 | struct lttng_event_notifier *event_notifier; | |
1933 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1934 | enum lttng_event_type *evtype = file->private_data; | |
1935 | ||
1936 | if (!evtype) | |
1937 | return 0; | |
1938 | ||
1939 | switch (*evtype) { | |
1940 | case LTTNG_TYPE_EVENT: | |
1941 | event_notifier = file->private_data; | |
1942 | if (event_notifier) | |
1943 | fput(event_notifier->group->file); | |
1944 | break; | |
1945 | case LTTNG_TYPE_ENABLER: | |
1946 | event_notifier_enabler = file->private_data; | |
1947 | if (event_notifier_enabler) | |
1948 | fput(event_notifier_enabler->group->file); | |
1949 | break; | |
1950 | default: | |
1951 | WARN_ON_ONCE(1); | |
1952 | break; | |
1953 | } | |
1954 | ||
1955 | return 0; | |
1956 | } | |
1957 | ||
1958 | static const struct file_operations lttng_event_notifier_fops = { | |
1959 | .owner = THIS_MODULE, | |
1960 | .release = lttng_event_notifier_release, | |
1961 | .unlocked_ioctl = lttng_event_notifier_ioctl, | |
1962 | #ifdef CONFIG_COMPAT | |
1963 | .compat_ioctl = lttng_event_notifier_ioctl, | |
1964 | #endif | |
1965 | }; | |
1966 | ||
1967 | static | |
1968 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
1969 | struct lttng_kernel_event_notifier *event_notifier_param) | |
1970 | { | |
1971 | struct lttng_event_notifier_group *event_notifier_group = | |
1972 | event_notifier_group_file->private_data; | |
1973 | int event_notifier_fd, ret; | |
1974 | struct file *event_notifier_file; | |
1975 | void *priv; | |
1976 | ||
1977 | switch (event_notifier_param->event.instrumentation) { | |
1978 | case LTTNG_KERNEL_TRACEPOINT: | |
9de67196 | 1979 | case LTTNG_KERNEL_UPROBE: |
b01155ba | 1980 | break; |
dffef45d | 1981 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1982 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1983 | break; | |
8a8ac9a8 FD |
1984 | case LTTNG_KERNEL_SYSCALL: |
1985 | break; | |
dffef45d | 1986 | case LTTNG_KERNEL_KRETPROBE: |
9de67196 | 1987 | /* Placing an event notifier on kretprobe is not supported. */ |
dffef45d FD |
1988 | case LTTNG_KERNEL_FUNCTION: |
1989 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1990 | default: |
1991 | ret = -EINVAL; | |
1992 | goto inval_instr; | |
1993 | } | |
1994 | ||
1995 | event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1996 | ||
1997 | event_notifier_fd = lttng_get_unused_fd(); | |
1998 | if (event_notifier_fd < 0) { | |
1999 | ret = event_notifier_fd; | |
2000 | goto fd_error; | |
2001 | } | |
2002 | ||
2003 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
2004 | <tng_event_notifier_fops, | |
2005 | NULL, O_RDWR); | |
2006 | if (IS_ERR(event_notifier_file)) { | |
2007 | ret = PTR_ERR(event_notifier_file); | |
2008 | goto file_error; | |
2009 | } | |
2010 | ||
2011 | /* The event notifier holds a reference on the event notifier group. */ | |
2012 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2013 | ret = -EOVERFLOW; | |
2014 | goto refcount_error; | |
2015 | } | |
2016 | ||
2017 | if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT | |
2018 | || event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) { | |
2019 | struct lttng_event_notifier_enabler *enabler; | |
2020 | ||
2021 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2022 | /* | |
2023 | * If the event name is a star globbing pattern, | |
2024 | * we create the special star globbing enabler. | |
2025 | */ | |
2026 | enabler = lttng_event_notifier_enabler_create( | |
2027 | event_notifier_group, | |
2028 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
2029 | event_notifier_param); | |
2030 | } else { | |
2031 | enabler = lttng_event_notifier_enabler_create( | |
2032 | event_notifier_group, | |
2033 | LTTNG_ENABLER_FORMAT_NAME, | |
2034 | event_notifier_param); | |
2035 | } | |
2036 | priv = enabler; | |
2037 | } else { | |
2038 | struct lttng_event_notifier *event_notifier; | |
2039 | ||
2040 | /* | |
2041 | * We tolerate no failure path after event notifier creation. | |
2042 | * It will stay invariant for the rest of the session. | |
2043 | */ | |
2044 | event_notifier = lttng_event_notifier_create(NULL, | |
99f52fcc FD |
2045 | event_notifier_param->event.token, |
2046 | event_notifier_param->error_counter_index, | |
2047 | event_notifier_group, | |
dffef45d FD |
2048 | event_notifier_param, NULL, |
2049 | event_notifier_param->event.instrumentation); | |
2050 | WARN_ON_ONCE(!event_notifier); | |
2051 | if (IS_ERR(event_notifier)) { | |
2052 | ret = PTR_ERR(event_notifier); | |
2053 | goto event_notifier_error; | |
2054 | } | |
2055 | priv = event_notifier; | |
2056 | } | |
2057 | event_notifier_file->private_data = priv; | |
2058 | fd_install(event_notifier_fd, event_notifier_file); | |
2059 | return event_notifier_fd; | |
2060 | ||
2061 | event_notifier_error: | |
2062 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2063 | refcount_error: | |
2064 | fput(event_notifier_file); | |
2065 | file_error: | |
2066 | put_unused_fd(event_notifier_fd); | |
2067 | fd_error: | |
2068 | inval_instr: | |
2069 | return ret; | |
2070 | } | |
2071 | ||
99f52fcc FD |
2072 | static |
2073 | long lttng_abi_event_notifier_group_create_error_counter( | |
2074 | struct file *event_notifier_group_file, | |
2075 | const struct lttng_kernel_counter_conf *error_counter_conf) | |
2076 | { | |
2077 | int counter_fd, ret; | |
2078 | char *counter_transport_name; | |
2079 | size_t counter_len; | |
2080 | struct lttng_counter *counter = NULL; | |
2081 | struct file *counter_file; | |
2082 | struct lttng_event_notifier_group *event_notifier_group = | |
2083 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2084 | ||
2085 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) { | |
2086 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); | |
2087 | return -EINVAL; | |
2088 | } | |
2089 | ||
2090 | if (error_counter_conf->number_dimensions != 1) { | |
2091 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2092 | return -EINVAL; | |
2093 | } | |
2094 | ||
2095 | switch (error_counter_conf->bitness) { | |
2096 | case LTTNG_KERNEL_COUNTER_BITNESS_64: | |
2097 | counter_transport_name = "counter-per-cpu-64-modular"; | |
2098 | break; | |
2099 | case LTTNG_KERNEL_COUNTER_BITNESS_32: | |
2100 | counter_transport_name = "counter-per-cpu-32-modular"; | |
2101 | break; | |
2102 | default: | |
2103 | return -EINVAL; | |
2104 | } | |
2105 | ||
2106 | /* | |
2107 | * Lock sessions to provide mutual exclusion against concurrent | |
2108 | * modification of event_notifier group, which would result in | |
2109 | * overwriting the error counter if set concurrently. | |
2110 | */ | |
2111 | lttng_lock_sessions(); | |
2112 | ||
2113 | if (event_notifier_group->error_counter) { | |
2114 | printk(KERN_ERR "Error counter already created in event_notifier group\n"); | |
2115 | ret = -EBUSY; | |
2116 | goto fd_error; | |
2117 | } | |
2118 | ||
2119 | counter_fd = lttng_get_unused_fd(); | |
2120 | if (counter_fd < 0) { | |
2121 | ret = counter_fd; | |
2122 | goto fd_error; | |
2123 | } | |
2124 | ||
2125 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2126 | <tng_counter_fops, | |
2127 | NULL, O_RDONLY); | |
2128 | if (IS_ERR(counter_file)) { | |
2129 | ret = PTR_ERR(counter_file); | |
2130 | goto file_error; | |
2131 | } | |
2132 | ||
2133 | counter_len = error_counter_conf->dimensions[0].size; | |
2134 | ||
2135 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2136 | ret = -EOVERFLOW; | |
2137 | goto refcount_error; | |
2138 | } | |
2139 | ||
2140 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2141 | 1, &counter_len); | |
2142 | if (!counter) { | |
2143 | ret = -EINVAL; | |
2144 | goto counter_error; | |
2145 | } | |
2146 | ||
99f52fcc | 2147 | event_notifier_group->error_counter_len = counter_len; |
ab04d7b1 MD |
2148 | /* |
2149 | * store-release to publish error counter matches load-acquire | |
2150 | * in record_error. Ensures the counter is created and the | |
2151 | * error_counter_len is set before they are used. | |
2152 | */ | |
2153 | smp_store_release(&event_notifier_group->error_counter, counter); | |
99f52fcc FD |
2154 | |
2155 | counter->file = counter_file; | |
2156 | counter->owner = event_notifier_group->file; | |
2157 | counter_file->private_data = counter; | |
2158 | /* Ownership transferred. */ | |
2159 | counter = NULL; | |
2160 | ||
2161 | fd_install(counter_fd, counter_file); | |
2162 | lttng_unlock_sessions(); | |
2163 | ||
2164 | return counter_fd; | |
2165 | ||
2166 | counter_error: | |
2167 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2168 | refcount_error: | |
2169 | fput(counter_file); | |
2170 | file_error: | |
2171 | put_unused_fd(counter_fd); | |
2172 | fd_error: | |
2173 | lttng_unlock_sessions(); | |
2174 | return ret; | |
2175 | } | |
2176 | ||
750b05f2 FD |
2177 | static |
2178 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2179 | unsigned long arg) | |
2180 | { | |
2181 | switch (cmd) { | |
21f58fb7 FD |
2182 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
2183 | { | |
2184 | return lttng_abi_open_event_notifier_group_stream(file); | |
2185 | } | |
dffef45d FD |
2186 | case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE: |
2187 | { | |
2188 | struct lttng_kernel_event_notifier uevent_notifier_param; | |
2189 | ||
2190 | if (copy_from_user(&uevent_notifier_param, | |
2191 | (struct lttng_kernel_event_notifier __user *) arg, | |
2192 | sizeof(uevent_notifier_param))) | |
2193 | return -EFAULT; | |
2194 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2195 | } | |
99f52fcc FD |
2196 | case LTTNG_KERNEL_COUNTER: |
2197 | { | |
2198 | struct lttng_kernel_counter_conf uerror_counter_conf; | |
2199 | ||
2200 | if (copy_from_user(&uerror_counter_conf, | |
2201 | (struct lttng_kernel_counter_conf __user *) arg, | |
2202 | sizeof(uerror_counter_conf))) | |
2203 | return -EFAULT; | |
2204 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2205 | &uerror_counter_conf); | |
2206 | } | |
750b05f2 FD |
2207 | default: |
2208 | return -ENOIOCTLCMD; | |
2209 | } | |
2210 | return 0; | |
2211 | } | |
2212 | ||
2213 | static | |
2214 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2215 | { | |
2216 | struct lttng_event_notifier_group *event_notifier_group = | |
2217 | file->private_data; | |
2218 | ||
2219 | if (event_notifier_group) | |
2220 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2221 | return 0; | |
2222 | } | |
2223 | ||
2224 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2225 | .owner = THIS_MODULE, | |
2226 | .release = lttng_event_notifier_group_release, | |
2227 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2228 | #ifdef CONFIG_COMPAT | |
2229 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2230 | #endif | |
2231 | }; | |
2232 | ||
ad1c05e1 MD |
2233 | /** |
2234 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2235 | * | |
c0e31d2e | 2236 | * @file: the file |
ad1c05e1 MD |
2237 | * @cmd: the command |
2238 | * @arg: command arg | |
2239 | * | |
2240 | * This ioctl implements lttng commands: | |
38d024ae | 2241 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
2242 | * Returns an event stream file descriptor or failure. |
2243 | * (typically, one event stream records events from one CPU) | |
38d024ae | 2244 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 2245 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
2246 | * LTTNG_KERNEL_CONTEXT |
2247 | * Prepend a context field to each event in the channel | |
e64957da MD |
2248 | * LTTNG_KERNEL_ENABLE |
2249 | * Enable recording for events in this channel (weak enable) | |
2250 | * LTTNG_KERNEL_DISABLE | |
2251 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 2252 | * |
baf20995 MD |
2253 | * Channel and event file descriptors also hold a reference on the session. |
2254 | */ | |
ad1c05e1 | 2255 | static |
c0e31d2e | 2256 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2257 | { |
a90917c3 | 2258 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 2259 | |
baf20995 | 2260 | switch (cmd) { |
6dccd6c1 | 2261 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2262 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 2263 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
2264 | case LTTNG_KERNEL_OLD_EVENT: |
2265 | { | |
2266 | struct lttng_kernel_event *uevent_param; | |
2267 | struct lttng_kernel_old_event *old_uevent_param; | |
2268 | int ret; | |
2269 | ||
2270 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
2271 | GFP_KERNEL); | |
2272 | if (!uevent_param) { | |
2273 | ret = -ENOMEM; | |
2274 | goto old_event_end; | |
2275 | } | |
2276 | old_uevent_param = kmalloc( | |
2277 | sizeof(struct lttng_kernel_old_event), | |
2278 | GFP_KERNEL); | |
2279 | if (!old_uevent_param) { | |
2280 | ret = -ENOMEM; | |
2281 | goto old_event_error_free_param; | |
2282 | } | |
2283 | if (copy_from_user(old_uevent_param, | |
2284 | (struct lttng_kernel_old_event __user *) arg, | |
2285 | sizeof(struct lttng_kernel_old_event))) { | |
2286 | ret = -EFAULT; | |
2287 | goto old_event_error_free_old_param; | |
2288 | } | |
2289 | ||
2290 | memcpy(uevent_param->name, old_uevent_param->name, | |
2291 | sizeof(uevent_param->name)); | |
2292 | uevent_param->instrumentation = | |
2293 | old_uevent_param->instrumentation; | |
2294 | ||
2295 | switch (old_uevent_param->instrumentation) { | |
2296 | case LTTNG_KERNEL_KPROBE: | |
2297 | uevent_param->u.kprobe.addr = | |
2298 | old_uevent_param->u.kprobe.addr; | |
2299 | uevent_param->u.kprobe.offset = | |
2300 | old_uevent_param->u.kprobe.offset; | |
2301 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2302 | old_uevent_param->u.kprobe.symbol_name, | |
2303 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2304 | break; | |
2305 | case LTTNG_KERNEL_KRETPROBE: | |
2306 | uevent_param->u.kretprobe.addr = | |
2307 | old_uevent_param->u.kretprobe.addr; | |
2308 | uevent_param->u.kretprobe.offset = | |
2309 | old_uevent_param->u.kretprobe.offset; | |
2310 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2311 | old_uevent_param->u.kretprobe.symbol_name, | |
2312 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2313 | break; | |
2314 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
2315 | WARN_ON_ONCE(1); |
2316 | /* Not implemented. */ | |
6dccd6c1 JD |
2317 | break; |
2318 | default: | |
2319 | break; | |
2320 | } | |
2321 | ret = lttng_abi_create_event(file, uevent_param); | |
2322 | ||
2323 | old_event_error_free_old_param: | |
2324 | kfree(old_uevent_param); | |
2325 | old_event_error_free_param: | |
2326 | kfree(uevent_param); | |
2327 | old_event_end: | |
2328 | return ret; | |
2329 | } | |
38d024ae | 2330 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
2331 | { |
2332 | struct lttng_kernel_event uevent_param; | |
2333 | ||
2334 | if (copy_from_user(&uevent_param, | |
2335 | (struct lttng_kernel_event __user *) arg, | |
2336 | sizeof(uevent_param))) | |
2337 | return -EFAULT; | |
2338 | return lttng_abi_create_event(file, &uevent_param); | |
2339 | } | |
2340 | case LTTNG_KERNEL_OLD_CONTEXT: | |
2341 | { | |
2342 | struct lttng_kernel_context *ucontext_param; | |
2343 | struct lttng_kernel_old_context *old_ucontext_param; | |
2344 | int ret; | |
2345 | ||
2346 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
2347 | GFP_KERNEL); | |
2348 | if (!ucontext_param) { | |
2349 | ret = -ENOMEM; | |
2350 | goto old_ctx_end; | |
2351 | } | |
2352 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
2353 | GFP_KERNEL); | |
2354 | if (!old_ucontext_param) { | |
2355 | ret = -ENOMEM; | |
2356 | goto old_ctx_error_free_param; | |
2357 | } | |
2358 | ||
2359 | if (copy_from_user(old_ucontext_param, | |
2360 | (struct lttng_kernel_old_context __user *) arg, | |
2361 | sizeof(struct lttng_kernel_old_context))) { | |
2362 | ret = -EFAULT; | |
2363 | goto old_ctx_error_free_old_param; | |
2364 | } | |
2365 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2366 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2367 | sizeof(ucontext_param->padding)); | |
2368 | /* only type that uses the union */ | |
2369 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
2370 | ucontext_param->u.perf_counter.type = | |
2371 | old_ucontext_param->u.perf_counter.type; | |
2372 | ucontext_param->u.perf_counter.config = | |
2373 | old_ucontext_param->u.perf_counter.config; | |
2374 | memcpy(ucontext_param->u.perf_counter.name, | |
2375 | old_ucontext_param->u.perf_counter.name, | |
2376 | sizeof(ucontext_param->u.perf_counter.name)); | |
2377 | } | |
2378 | ||
2379 | ret = lttng_abi_add_context(file, | |
2380 | ucontext_param, | |
2381 | &channel->ctx, channel->session); | |
2382 | ||
2383 | old_ctx_error_free_old_param: | |
2384 | kfree(old_ucontext_param); | |
2385 | old_ctx_error_free_param: | |
2386 | kfree(ucontext_param); | |
2387 | old_ctx_end: | |
2388 | return ret; | |
2389 | } | |
8070f5c0 | 2390 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
2391 | { |
2392 | struct lttng_kernel_context ucontext_param; | |
2393 | ||
2394 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 2395 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
2396 | sizeof(ucontext_param))) |
2397 | return -EFAULT; | |
2398 | return lttng_abi_add_context(file, | |
2399 | &ucontext_param, | |
8070f5c0 | 2400 | &channel->ctx, channel->session); |
6dccd6c1 JD |
2401 | } |
2402 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2403 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 2404 | return lttng_channel_enable(channel); |
6dccd6c1 | 2405 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2406 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 2407 | return lttng_channel_disable(channel); |
12e579db MD |
2408 | case LTTNG_KERNEL_SYSCALL_MASK: |
2409 | return lttng_channel_syscall_mask(channel, | |
2410 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
2411 | default: |
2412 | return -ENOIOCTLCMD; | |
2413 | } | |
2414 | } | |
2415 | ||
5dbbdb43 MD |
2416 | /** |
2417 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2418 | * | |
2419 | * @file: the file | |
2420 | * @cmd: the command | |
2421 | * @arg: command arg | |
2422 | * | |
2423 | * This ioctl implements lttng commands: | |
38d024ae | 2424 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
2425 | * Returns an event stream file descriptor or failure. |
2426 | * | |
2427 | * Channel and event file descriptors also hold a reference on the session. | |
2428 | */ | |
2429 | static | |
2430 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2431 | { | |
2432 | switch (cmd) { | |
6dccd6c1 | 2433 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2434 | case LTTNG_KERNEL_STREAM: |
d83004aa | 2435 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2436 | default: |
2437 | return -ENOIOCTLCMD; | |
2438 | } | |
2439 | } | |
2440 | ||
653fe716 MD |
2441 | /** |
2442 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2443 | * | |
c0e31d2e | 2444 | * @file: the file |
653fe716 MD |
2445 | * @wait: poll table |
2446 | */ | |
c0e31d2e | 2447 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2448 | { |
a90917c3 | 2449 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2450 | unsigned int mask = 0; |
2451 | ||
c0e31d2e | 2452 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2453 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2454 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2455 | wait); | |
653fe716 | 2456 | |
254ec7bc MD |
2457 | if (channel->ops->is_disabled(channel->chan)) |
2458 | return POLLERR; | |
24cedcfe | 2459 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2460 | return POLLHUP; |
f71ecafa | 2461 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2462 | return POLLIN | POLLRDNORM; |
f71ecafa | 2463 | return 0; |
653fe716 MD |
2464 | } |
2465 | return mask; | |
2466 | ||
2467 | } | |
2468 | ||
0a84a57f MD |
2469 | static |
2470 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2471 | { | |
a90917c3 | 2472 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
2473 | |
2474 | if (channel) | |
2475 | fput(channel->session->file); | |
0a84a57f MD |
2476 | return 0; |
2477 | } | |
2478 | ||
d83004aa JD |
2479 | static |
2480 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2481 | { | |
2482 | struct lttng_channel *channel = file->private_data; | |
2483 | ||
2484 | if (channel) { | |
d83004aa | 2485 | fput(channel->session->file); |
a3381417 | 2486 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2487 | } |
2488 | ||
2489 | return 0; | |
2490 | } | |
2491 | ||
ad1c05e1 | 2492 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2493 | .owner = THIS_MODULE, |
03037b98 | 2494 | .release = lttng_channel_release, |
653fe716 | 2495 | .poll = lttng_channel_poll, |
ad1c05e1 | 2496 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2497 | #ifdef CONFIG_COMPAT |
03037b98 | 2498 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2499 | #endif |
11b5a3c2 | 2500 | }; |
baf20995 | 2501 | |
5dbbdb43 | 2502 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2503 | .owner = THIS_MODULE, |
d83004aa | 2504 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2505 | .unlocked_ioctl = lttng_metadata_ioctl, |
2506 | #ifdef CONFIG_COMPAT | |
2507 | .compat_ioctl = lttng_metadata_ioctl, | |
2508 | #endif | |
2509 | }; | |
2510 | ||
8070f5c0 MD |
2511 | /** |
2512 | * lttng_event_ioctl - lttng syscall through ioctl | |
2513 | * | |
2514 | * @file: the file | |
2515 | * @cmd: the command | |
2516 | * @arg: command arg | |
2517 | * | |
2518 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
2519 | * LTTNG_KERNEL_CONTEXT |
2520 | * Prepend a context field to each record of this event | |
e64957da MD |
2521 | * LTTNG_KERNEL_ENABLE |
2522 | * Enable recording for this event (weak enable) | |
2523 | * LTTNG_KERNEL_DISABLE | |
2524 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
2525 | */ |
2526 | static | |
2527 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2528 | { | |
3c997079 | 2529 | struct lttng_event *event; |
b2bc0bc8 | 2530 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2531 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
2532 | |
2533 | switch (cmd) { | |
6dccd6c1 JD |
2534 | case LTTNG_KERNEL_OLD_CONTEXT: |
2535 | { | |
3c997079 MD |
2536 | /* Not implemented */ |
2537 | return -ENOSYS; | |
6dccd6c1 | 2538 | } |
8070f5c0 | 2539 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 2540 | { |
3c997079 MD |
2541 | /* Not implemented */ |
2542 | return -ENOSYS; | |
6dccd6c1 JD |
2543 | } |
2544 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2545 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
2546 | switch (*evtype) { |
2547 | case LTTNG_TYPE_EVENT: | |
2548 | event = file->private_data; | |
2549 | return lttng_event_enable(event); | |
2550 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2551 | event_enabler = file->private_data; |
2552 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
2553 | default: |
2554 | WARN_ON_ONCE(1); | |
2555 | return -ENOSYS; | |
2556 | } | |
6dccd6c1 | 2557 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2558 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
2559 | switch (*evtype) { |
2560 | case LTTNG_TYPE_EVENT: | |
2561 | event = file->private_data; | |
2562 | return lttng_event_disable(event); | |
2563 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2564 | event_enabler = file->private_data; |
2565 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
2566 | default: |
2567 | WARN_ON_ONCE(1); | |
2568 | return -ENOSYS; | |
2569 | } | |
07dfc1d0 MD |
2570 | case LTTNG_KERNEL_FILTER: |
2571 | switch (*evtype) { | |
2572 | case LTTNG_TYPE_EVENT: | |
2573 | return -EINVAL; | |
2574 | case LTTNG_TYPE_ENABLER: | |
2575 | { | |
b2bc0bc8 | 2576 | event_enabler = file->private_data; |
183e8b3a FD |
2577 | return lttng_event_enabler_attach_filter_bytecode( |
2578 | event_enabler, | |
07dfc1d0 MD |
2579 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2580 | } | |
0586316f MD |
2581 | default: |
2582 | WARN_ON_ONCE(1); | |
2583 | return -ENOSYS; | |
07dfc1d0 | 2584 | } |
3aed4dca FD |
2585 | case LTTNG_KERNEL_ADD_CALLSITE: |
2586 | switch (*evtype) { | |
2587 | case LTTNG_TYPE_EVENT: | |
2588 | event = file->private_data; | |
2589 | return lttng_event_add_callsite(event, | |
2590 | (struct lttng_kernel_event_callsite __user *) arg); | |
2591 | case LTTNG_TYPE_ENABLER: | |
2592 | return -EINVAL; | |
64c147c0 MD |
2593 | default: |
2594 | WARN_ON_ONCE(1); | |
2595 | return -ENOSYS; | |
3aed4dca | 2596 | } |
8070f5c0 MD |
2597 | default: |
2598 | return -ENOIOCTLCMD; | |
2599 | } | |
2600 | } | |
2601 | ||
0a84a57f MD |
2602 | static |
2603 | int lttng_event_release(struct inode *inode, struct file *file) | |
2604 | { | |
3c997079 | 2605 | struct lttng_event *event; |
b2bc0bc8 | 2606 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2607 | enum lttng_event_type *evtype = file->private_data; |
2608 | ||
2609 | if (!evtype) | |
2610 | return 0; | |
2611 | ||
2612 | switch (*evtype) { | |
2613 | case LTTNG_TYPE_EVENT: | |
2614 | event = file->private_data; | |
2615 | if (event) | |
2616 | fput(event->chan->file); | |
2617 | break; | |
2618 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2619 | event_enabler = file->private_data; |
2620 | if (event_enabler) | |
2621 | fput(event_enabler->chan->file); | |
3c997079 MD |
2622 | break; |
2623 | default: | |
2624 | WARN_ON_ONCE(1); | |
2625 | break; | |
2626 | } | |
c269fff4 | 2627 | |
0a84a57f MD |
2628 | return 0; |
2629 | } | |
2630 | ||
3b923e5b | 2631 | /* TODO: filter control ioctl */ |
0a84a57f | 2632 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 2633 | .owner = THIS_MODULE, |
0a84a57f | 2634 | .release = lttng_event_release, |
8070f5c0 MD |
2635 | .unlocked_ioctl = lttng_event_ioctl, |
2636 | #ifdef CONFIG_COMPAT | |
2637 | .compat_ioctl = lttng_event_ioctl, | |
2638 | #endif | |
11b5a3c2 | 2639 | }; |
0a84a57f | 2640 | |
3b731ab1 JD |
2641 | static int put_u64(uint64_t val, unsigned long arg) |
2642 | { | |
2643 | return put_user(val, (uint64_t __user *) arg); | |
2644 | } | |
2645 | ||
8b97fd42 MD |
2646 | static int put_u32(uint32_t val, unsigned long arg) |
2647 | { | |
2648 | return put_user(val, (uint32_t __user *) arg); | |
2649 | } | |
2650 | ||
ed8d02d6 JD |
2651 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2652 | unsigned int cmd, unsigned long arg) | |
2653 | { | |
3b731ab1 JD |
2654 | struct lib_ring_buffer *buf = filp->private_data; |
2655 | struct channel *chan = buf->backend.chan; | |
2656 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2657 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2658 | int ret; |
2659 | ||
2660 | if (atomic_read(&chan->record_disabled)) | |
2661 | return -EIO; | |
2662 | ||
ed8d02d6 | 2663 | switch (cmd) { |
3b731ab1 JD |
2664 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
2665 | { | |
2666 | uint64_t ts; | |
2667 | ||
dd5a0db3 | 2668 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2669 | if (ret < 0) |
2670 | goto error; | |
2671 | return put_u64(ts, arg); | |
2672 | } | |
2673 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
2674 | { | |
2675 | uint64_t ts; | |
2676 | ||
dd5a0db3 | 2677 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2678 | if (ret < 0) |
2679 | goto error; | |
2680 | return put_u64(ts, arg); | |
2681 | } | |
2682 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
2683 | { | |
2684 | uint64_t ed; | |
2685 | ||
dd5a0db3 | 2686 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2687 | if (ret < 0) |
2688 | goto error; | |
2689 | return put_u64(ed, arg); | |
2690 | } | |
2691 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
2692 | { | |
2693 | uint64_t cs; | |
2694 | ||
dd5a0db3 | 2695 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2696 | if (ret < 0) |
2697 | goto error; | |
2698 | return put_u64(cs, arg); | |
2699 | } | |
2700 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
2701 | { | |
2702 | uint64_t ps; | |
2703 | ||
dd5a0db3 | 2704 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2705 | if (ret < 0) |
2706 | goto error; | |
2707 | return put_u64(ps, arg); | |
2708 | } | |
2709 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
2710 | { | |
2711 | uint64_t si; | |
2712 | ||
dd5a0db3 | 2713 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2714 | if (ret < 0) |
2715 | goto error; | |
2716 | return put_u64(si, arg); | |
2717 | } | |
2348ca17 JD |
2718 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2719 | { | |
2720 | uint64_t ts; | |
2721 | ||
dd5a0db3 | 2722 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2723 | if (ret < 0) |
2724 | goto error; | |
2725 | return put_u64(ts, arg); | |
2726 | } | |
5b3cf4f9 JD |
2727 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
2728 | { | |
2729 | uint64_t seq; | |
2730 | ||
2731 | ret = ops->sequence_number(config, buf, &seq); | |
2732 | if (ret < 0) | |
2733 | goto error; | |
2734 | return put_u64(seq, arg); | |
2735 | } | |
5594698f JD |
2736 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
2737 | { | |
2738 | uint64_t id; | |
2739 | ||
2740 | ret = ops->instance_id(config, buf, &id); | |
2741 | if (ret < 0) | |
2742 | goto error; | |
2743 | return put_u64(id, arg); | |
2744 | } | |
3b731ab1 JD |
2745 | default: |
2746 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2747 | cmd, arg); | |
ed8d02d6 | 2748 | } |
3b731ab1 JD |
2749 | |
2750 | error: | |
2751 | return -ENOSYS; | |
ed8d02d6 JD |
2752 | } |
2753 | ||
2754 | #ifdef CONFIG_COMPAT | |
2755 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2756 | unsigned int cmd, unsigned long arg) | |
2757 | { | |
3b731ab1 JD |
2758 | struct lib_ring_buffer *buf = filp->private_data; |
2759 | struct channel *chan = buf->backend.chan; | |
2760 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2761 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2762 | int ret; |
2763 | ||
2764 | if (atomic_read(&chan->record_disabled)) | |
2765 | return -EIO; | |
2766 | ||
ed8d02d6 | 2767 | switch (cmd) { |
3b731ab1 JD |
2768 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2769 | { | |
2770 | uint64_t ts; | |
2771 | ||
dd5a0db3 | 2772 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2773 | if (ret < 0) |
2774 | goto error; | |
2775 | return put_u64(ts, arg); | |
2776 | } | |
2777 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
2778 | { | |
2779 | uint64_t ts; | |
2780 | ||
dd5a0db3 | 2781 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2782 | if (ret < 0) |
2783 | goto error; | |
2784 | return put_u64(ts, arg); | |
2785 | } | |
2786 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
2787 | { | |
2788 | uint64_t ed; | |
2789 | ||
dd5a0db3 | 2790 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2791 | if (ret < 0) |
2792 | goto error; | |
2793 | return put_u64(ed, arg); | |
ed8d02d6 | 2794 | } |
3b731ab1 JD |
2795 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
2796 | { | |
2797 | uint64_t cs; | |
2798 | ||
dd5a0db3 | 2799 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2800 | if (ret < 0) |
2801 | goto error; | |
2802 | return put_u64(cs, arg); | |
2803 | } | |
2804 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
2805 | { | |
2806 | uint64_t ps; | |
2807 | ||
dd5a0db3 | 2808 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2809 | if (ret < 0) |
2810 | goto error; | |
2811 | return put_u64(ps, arg); | |
2812 | } | |
2813 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
2814 | { | |
2815 | uint64_t si; | |
2816 | ||
dd5a0db3 | 2817 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2818 | if (ret < 0) |
2819 | goto error; | |
2820 | return put_u64(si, arg); | |
2821 | } | |
2348ca17 JD |
2822 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2823 | { | |
2824 | uint64_t ts; | |
2825 | ||
dd5a0db3 | 2826 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2827 | if (ret < 0) |
2828 | goto error; | |
2829 | return put_u64(ts, arg); | |
2830 | } | |
5b3cf4f9 JD |
2831 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2832 | { | |
2833 | uint64_t seq; | |
2834 | ||
2835 | ret = ops->sequence_number(config, buf, &seq); | |
2836 | if (ret < 0) | |
2837 | goto error; | |
2838 | return put_u64(seq, arg); | |
2839 | } | |
5594698f JD |
2840 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2841 | { | |
2842 | uint64_t id; | |
2843 | ||
2844 | ret = ops->instance_id(config, buf, &id); | |
2845 | if (ret < 0) | |
2846 | goto error; | |
2847 | return put_u64(id, arg); | |
2848 | } | |
3b731ab1 JD |
2849 | default: |
2850 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2851 | cmd, arg); | |
2852 | } | |
2853 | ||
2854 | error: | |
2855 | return -ENOSYS; | |
ed8d02d6 JD |
2856 | } |
2857 | #endif /* CONFIG_COMPAT */ | |
2858 | ||
2859 | static void lttng_stream_override_ring_buffer_fops(void) | |
2860 | { | |
2861 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2862 | lttng_stream_ring_buffer_file_operations.open = | |
2863 | lib_ring_buffer_file_operations.open; | |
2864 | lttng_stream_ring_buffer_file_operations.release = | |
2865 | lib_ring_buffer_file_operations.release; | |
2866 | lttng_stream_ring_buffer_file_operations.poll = | |
2867 | lib_ring_buffer_file_operations.poll; | |
2868 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2869 | lib_ring_buffer_file_operations.splice_read; | |
2870 | lttng_stream_ring_buffer_file_operations.mmap = | |
2871 | lib_ring_buffer_file_operations.mmap; | |
2872 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2873 | lttng_stream_ring_buffer_ioctl; | |
2874 | lttng_stream_ring_buffer_file_operations.llseek = | |
2875 | lib_ring_buffer_file_operations.llseek; | |
2876 | #ifdef CONFIG_COMPAT | |
2877 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2878 | lttng_stream_ring_buffer_compat_ioctl; | |
2879 | #endif | |
2880 | } | |
2881 | ||
80996790 | 2882 | int __init lttng_abi_init(void) |
baf20995 MD |
2883 | { |
2884 | int ret = 0; | |
2885 | ||
263b6c88 | 2886 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2887 | lttng_clock_ref(); |
f771eda6 JD |
2888 | |
2889 | ret = lttng_tp_mempool_init(); | |
2890 | if (ret) { | |
2891 | goto error; | |
2892 | } | |
2893 | ||
d29348f7 | 2894 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2895 | <tng_proc_ops, NULL); |
2470a237 | 2896 | |
255e52a4 | 2897 | if (!lttng_proc_dentry) { |
5a15f70c | 2898 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
2899 | ret = -ENOMEM; |
2900 | goto error; | |
2901 | } | |
ed8d02d6 | 2902 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2903 | return 0; |
ed8d02d6 | 2904 | |
baf20995 | 2905 | error: |
f771eda6 | 2906 | lttng_tp_mempool_destroy(); |
2754583e | 2907 | lttng_clock_unref(); |
baf20995 MD |
2908 | return ret; |
2909 | } | |
2910 | ||
e6e65fcd MD |
2911 | /* No __exit annotation because used by init error path too. */ |
2912 | void lttng_abi_exit(void) | |
baf20995 | 2913 | { |
f771eda6 | 2914 | lttng_tp_mempool_destroy(); |
2754583e | 2915 | lttng_clock_unref(); |
e6a17f26 MD |
2916 | if (lttng_proc_dentry) |
2917 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2918 | } |