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> | |
6657edec | 40 | #include <wrapper/barrier.h> |
2df37e95 MD |
41 | #include <lttng/string-utils.h> |
42 | #include <lttng/abi.h> | |
43 | #include <lttng/abi-old.h> | |
44 | #include <lttng/events.h> | |
92bc1e23 | 45 | #include <lttng/events-internal.h> |
2df37e95 MD |
46 | #include <lttng/tracer.h> |
47 | #include <lttng/tp-mempool.h> | |
24591303 | 48 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 49 | #include <ringbuffer/iterator.h> |
baf20995 MD |
50 | |
51 | /* | |
52 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 53 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
54 | */ |
55 | ||
e6a17f26 | 56 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 | 57 | |
5f4c791e | 58 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
59 | static const struct proc_ops lttng_proc_ops; |
60 | #else | |
61 | static const struct file_operations lttng_proc_ops; | |
62 | #endif | |
63 | ||
ad1c05e1 | 64 | static const struct file_operations lttng_session_fops; |
750b05f2 | 65 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 66 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 67 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 68 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 69 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 70 | |
9616f0bf | 71 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 72 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 73 | |
99f52fcc FD |
74 | static int validate_zeroed_padding(char *p, size_t len) |
75 | { | |
76 | size_t i; | |
77 | ||
78 | for (i = 0; i < len; i++) { | |
79 | if (p[i]) | |
80 | return -1; | |
81 | } | |
82 | return 0; | |
83 | } | |
84 | ||
a33c9927 MD |
85 | /* |
86 | * Teardown management: opened file descriptors keep a refcount on the module, | |
87 | * so it can only exit when all file descriptors are closed. | |
88 | */ | |
89 | ||
ad1c05e1 | 90 | static |
baf20995 MD |
91 | int lttng_abi_create_session(void) |
92 | { | |
a90917c3 | 93 | struct lttng_session *session; |
c0e31d2e | 94 | struct file *session_file; |
11b5a3c2 | 95 | int session_fd, ret; |
baf20995 | 96 | |
a90917c3 | 97 | session = lttng_session_create(); |
baf20995 MD |
98 | if (!session) |
99 | return -ENOMEM; | |
4ac10b76 | 100 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
101 | if (session_fd < 0) { |
102 | ret = session_fd; | |
103 | goto fd_error; | |
104 | } | |
c0e31d2e | 105 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 106 | <tng_session_fops, |
baf20995 | 107 | session, O_RDWR); |
c0e31d2e MD |
108 | if (IS_ERR(session_file)) { |
109 | ret = PTR_ERR(session_file); | |
baf20995 MD |
110 | goto file_error; |
111 | } | |
c0e31d2e MD |
112 | session->file = session_file; |
113 | fd_install(session_fd, session_file); | |
baf20995 MD |
114 | return session_fd; |
115 | ||
116 | file_error: | |
117 | put_unused_fd(session_fd); | |
118 | fd_error: | |
a90917c3 | 119 | lttng_session_destroy(session); |
baf20995 MD |
120 | return ret; |
121 | } | |
122 | ||
21f58fb7 FD |
123 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
124 | { | |
125 | struct lttng_event_notifier_group *event_notifier_group = | |
126 | container_of(entry, struct lttng_event_notifier_group, | |
127 | wakeup_pending); | |
128 | wake_up_interruptible(&event_notifier_group->read_wait); | |
129 | } | |
130 | ||
750b05f2 FD |
131 | static |
132 | int lttng_abi_create_event_notifier_group(void) | |
133 | { | |
134 | struct lttng_event_notifier_group *event_notifier_group; | |
135 | struct file *event_notifier_group_file; | |
136 | int event_notifier_group_fd, ret; | |
137 | ||
138 | event_notifier_group = lttng_event_notifier_group_create(); | |
139 | if (!event_notifier_group) | |
140 | return -ENOMEM; | |
141 | ||
142 | event_notifier_group_fd = lttng_get_unused_fd(); | |
143 | if (event_notifier_group_fd < 0) { | |
144 | ret = event_notifier_group_fd; | |
145 | goto fd_error; | |
146 | } | |
147 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
148 | <tng_event_notifier_group_fops, | |
149 | event_notifier_group, O_RDWR); | |
150 | if (IS_ERR(event_notifier_group_file)) { | |
151 | ret = PTR_ERR(event_notifier_group_file); | |
152 | goto file_error; | |
153 | } | |
154 | ||
155 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
156 | init_waitqueue_head(&event_notifier_group->read_wait); |
157 | init_irq_work(&event_notifier_group->wakeup_pending, | |
158 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
159 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
160 | return event_notifier_group_fd; | |
161 | ||
162 | file_error: | |
163 | put_unused_fd(event_notifier_group_fd); | |
164 | fd_error: | |
165 | lttng_event_notifier_group_destroy(event_notifier_group); | |
166 | return ret; | |
167 | } | |
168 | ||
271b6681 MD |
169 | static |
170 | int lttng_abi_tracepoint_list(void) | |
171 | { | |
172 | struct file *tracepoint_list_file; | |
173 | int file_fd, ret; | |
174 | ||
4ac10b76 | 175 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
176 | if (file_fd < 0) { |
177 | ret = file_fd; | |
178 | goto fd_error; | |
179 | } | |
30f18bf0 | 180 | |
8ee099b6 | 181 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
182 | <tng_tracepoint_list_fops, |
183 | NULL, O_RDWR); | |
184 | if (IS_ERR(tracepoint_list_file)) { | |
185 | ret = PTR_ERR(tracepoint_list_file); | |
186 | goto file_error; | |
187 | } | |
30f18bf0 MD |
188 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
189 | if (ret < 0) | |
190 | goto open_error; | |
271b6681 MD |
191 | fd_install(file_fd, tracepoint_list_file); |
192 | return file_fd; | |
193 | ||
30f18bf0 MD |
194 | open_error: |
195 | fput(tracepoint_list_file); | |
271b6681 MD |
196 | file_error: |
197 | put_unused_fd(file_fd); | |
198 | fd_error: | |
199 | return ret; | |
200 | } | |
201 | ||
f127e61e MD |
202 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
203 | static inline | |
204 | int lttng_abi_syscall_list(void) | |
205 | { | |
206 | return -ENOSYS; | |
207 | } | |
208 | #else | |
209 | static | |
210 | int lttng_abi_syscall_list(void) | |
211 | { | |
212 | struct file *syscall_list_file; | |
213 | int file_fd, ret; | |
214 | ||
215 | file_fd = lttng_get_unused_fd(); | |
216 | if (file_fd < 0) { | |
217 | ret = file_fd; | |
218 | goto fd_error; | |
219 | } | |
220 | ||
221 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
222 | <tng_syscall_list_fops, | |
223 | NULL, O_RDWR); | |
224 | if (IS_ERR(syscall_list_file)) { | |
225 | ret = PTR_ERR(syscall_list_file); | |
226 | goto file_error; | |
227 | } | |
228 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
229 | if (ret < 0) | |
230 | goto open_error; | |
231 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
232 | return file_fd; |
233 | ||
234 | open_error: | |
235 | fput(syscall_list_file); | |
236 | file_error: | |
237 | put_unused_fd(file_fd); | |
238 | fd_error: | |
239 | return ret; | |
240 | } | |
241 | #endif | |
242 | ||
80c16bcf | 243 | static |
6dccd6c1 | 244 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 245 | { |
6dccd6c1 JD |
246 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
247 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
248 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
249 | } |
250 | ||
42cabb80 MD |
251 | static |
252 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
253 | { | |
254 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
255 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
256 | } | |
257 | ||
8070f5c0 MD |
258 | static |
259 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 260 | struct lttng_kernel_context *context_param, |
a90917c3 | 261 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 262 | { |
8070f5c0 MD |
263 | |
264 | if (session->been_active) | |
265 | return -EPERM; | |
266 | ||
6dccd6c1 | 267 | switch (context_param->ctx) { |
12a313a5 | 268 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 269 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
270 | case LTTNG_KERNEL_CONTEXT_PRIO: |
271 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
272 | case LTTNG_KERNEL_CONTEXT_NICE: |
273 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
274 | case LTTNG_KERNEL_CONTEXT_VPID: |
275 | return lttng_add_vpid_to_ctx(ctx); | |
276 | case LTTNG_KERNEL_CONTEXT_TID: | |
277 | return lttng_add_tid_to_ctx(ctx); | |
278 | case LTTNG_KERNEL_CONTEXT_VTID: | |
279 | return lttng_add_vtid_to_ctx(ctx); | |
280 | case LTTNG_KERNEL_CONTEXT_PPID: | |
281 | return lttng_add_ppid_to_ctx(ctx); | |
282 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
283 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 284 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
285 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
286 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
287 | context_param->u.perf_counter.config, | |
288 | context_param->u.perf_counter.name, | |
c24a0d71 | 289 | ctx); |
a2563e83 MD |
290 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
291 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
292 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
293 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
294 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
295 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
296 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
297 | return lttng_add_interruptible_to_ctx(ctx); | |
298 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
299 | return lttng_add_need_reschedule_to_ctx(ctx); | |
300 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
301 | return lttng_add_preemptible_to_ctx(ctx); | |
302 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
303 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
304 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
305 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
306 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
307 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
308 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
309 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
310 | return lttng_add_ipc_ns_to_ctx(ctx); | |
311 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
312 | return lttng_add_mnt_ns_to_ctx(ctx); | |
313 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
314 | return lttng_add_net_ns_to_ctx(ctx); | |
315 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
316 | return lttng_add_pid_ns_to_ctx(ctx); | |
317 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
318 | return lttng_add_user_ns_to_ctx(ctx); | |
319 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
320 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
321 | case LTTNG_KERNEL_CONTEXT_UID: |
322 | return lttng_add_uid_to_ctx(ctx); | |
323 | case LTTNG_KERNEL_CONTEXT_EUID: | |
324 | return lttng_add_euid_to_ctx(ctx); | |
325 | case LTTNG_KERNEL_CONTEXT_SUID: | |
326 | return lttng_add_suid_to_ctx(ctx); | |
327 | case LTTNG_KERNEL_CONTEXT_GID: | |
328 | return lttng_add_gid_to_ctx(ctx); | |
329 | case LTTNG_KERNEL_CONTEXT_EGID: | |
330 | return lttng_add_egid_to_ctx(ctx); | |
331 | case LTTNG_KERNEL_CONTEXT_SGID: | |
332 | return lttng_add_sgid_to_ctx(ctx); | |
333 | case LTTNG_KERNEL_CONTEXT_VUID: | |
334 | return lttng_add_vuid_to_ctx(ctx); | |
335 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
336 | return lttng_add_veuid_to_ctx(ctx); | |
337 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
338 | return lttng_add_vsuid_to_ctx(ctx); | |
339 | case LTTNG_KERNEL_CONTEXT_VGID: | |
340 | return lttng_add_vgid_to_ctx(ctx); | |
341 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
342 | return lttng_add_vegid_to_ctx(ctx); | |
343 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
344 | return lttng_add_vsgid_to_ctx(ctx); | |
876e2e92 MJ |
345 | case LTTNG_KERNEL_CONTEXT_TIME_NS: |
346 | return lttng_add_time_ns_to_ctx(ctx); | |
8070f5c0 MD |
347 | default: |
348 | return -EINVAL; | |
349 | } | |
350 | } | |
351 | ||
ad1c05e1 MD |
352 | /** |
353 | * lttng_ioctl - lttng syscall through ioctl | |
354 | * | |
c0e31d2e | 355 | * @file: the file |
ad1c05e1 MD |
356 | * @cmd: the command |
357 | * @arg: command arg | |
358 | * | |
359 | * This ioctl implements lttng commands: | |
38d024ae | 360 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 361 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
362 | * LTTNG_KERNEL_TRACER_VERSION |
363 | * Returns the LTTng kernel tracer version | |
364 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
365 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
366 | * LTTNG_KERNEL_WAIT_QUIESCENT |
367 | * Returns after all previously running probes have completed | |
42cabb80 MD |
368 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
369 | * Returns the LTTng kernel tracer ABI version | |
750b05f2 FD |
370 | * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE |
371 | * Returns a LTTng event notifier group file descriptor | |
ad1c05e1 MD |
372 | * |
373 | * The returned session will be deleted when its file descriptor is closed. | |
374 | */ | |
375 | static | |
c0e31d2e | 376 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
377 | { |
378 | switch (cmd) { | |
6dccd6c1 | 379 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 380 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 381 | return lttng_abi_create_session(); |
750b05f2 FD |
382 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE: |
383 | return lttng_abi_create_event_notifier_group(); | |
6dccd6c1 JD |
384 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
385 | { | |
386 | struct lttng_kernel_tracer_version v; | |
387 | struct lttng_kernel_old_tracer_version oldv; | |
388 | struct lttng_kernel_old_tracer_version *uversion = | |
389 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
390 | ||
391 | lttng_abi_tracer_version(&v); | |
392 | oldv.major = v.major; | |
393 | oldv.minor = v.minor; | |
394 | oldv.patchlevel = v.patchlevel; | |
395 | ||
396 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
397 | return -EFAULT; | |
398 | return 0; | |
399 | } | |
80c16bcf | 400 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
401 | { |
402 | struct lttng_kernel_tracer_version version; | |
403 | struct lttng_kernel_tracer_version *uversion = | |
404 | (struct lttng_kernel_tracer_version __user *) arg; | |
405 | ||
406 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
407 | |
408 | if (copy_to_user(uversion, &version, sizeof(version))) | |
409 | return -EFAULT; | |
410 | return 0; | |
411 | } | |
412 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
413 | { | |
414 | struct lttng_kernel_tracer_abi_version version; | |
415 | struct lttng_kernel_tracer_abi_version *uversion = | |
416 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
417 | ||
418 | lttng_abi_tracer_abi_version(&version); | |
419 | ||
6dccd6c1 JD |
420 | if (copy_to_user(uversion, &version, sizeof(version))) |
421 | return -EFAULT; | |
422 | return 0; | |
423 | } | |
424 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
425 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
426 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
427 | case LTTNG_KERNEL_SYSCALL_LIST: |
428 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 429 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
430 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
431 | synchronize_trace(); | |
432 | return 0; | |
6dccd6c1 JD |
433 | case LTTNG_KERNEL_OLD_CALIBRATE: |
434 | { | |
435 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
436 | (struct lttng_kernel_old_calibrate __user *) arg; | |
437 | struct lttng_kernel_old_calibrate old_calibrate; | |
438 | struct lttng_kernel_calibrate calibrate; | |
439 | int ret; | |
440 | ||
441 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
442 | return -EFAULT; | |
443 | calibrate.type = old_calibrate.type; | |
444 | ret = lttng_calibrate(&calibrate); | |
445 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
446 | return -EFAULT; | |
447 | return ret; | |
448 | } | |
57105fc2 MD |
449 | case LTTNG_KERNEL_CALIBRATE: |
450 | { | |
3db41b2c MD |
451 | struct lttng_kernel_calibrate __user *ucalibrate = |
452 | (struct lttng_kernel_calibrate __user *) arg; | |
453 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
454 | int ret; |
455 | ||
456 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
457 | return -EFAULT; | |
458 | ret = lttng_calibrate(&calibrate); | |
459 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
460 | return -EFAULT; | |
461 | return ret; | |
462 | } | |
ad1c05e1 MD |
463 | default: |
464 | return -ENOIOCTLCMD; | |
465 | } | |
466 | } | |
467 | ||
5f4c791e | 468 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
469 | static const struct proc_ops lttng_proc_ops = { |
470 | .proc_ioctl = lttng_ioctl, | |
471 | #ifdef CONFIG_COMPAT | |
472 | .proc_compat_ioctl = lttng_ioctl, | |
473 | #endif /* CONFIG_COMPAT */ | |
474 | }; | |
475 | #else | |
476 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 477 | .owner = THIS_MODULE, |
ad1c05e1 MD |
478 | .unlocked_ioctl = lttng_ioctl, |
479 | #ifdef CONFIG_COMPAT | |
03037b98 | 480 | .compat_ioctl = lttng_ioctl, |
059de147 | 481 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 482 | }; |
059de147 | 483 | #endif |
ad1c05e1 | 484 | |
5dbbdb43 | 485 | static |
c0e31d2e | 486 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 487 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 488 | enum channel_type channel_type) |
baf20995 | 489 | { |
a90917c3 | 490 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 491 | const struct file_operations *fops = NULL; |
5dbbdb43 | 492 | const char *transport_name; |
a90917c3 | 493 | struct lttng_channel *chan; |
c0e31d2e | 494 | struct file *chan_file; |
baf20995 | 495 | int chan_fd; |
ad1c05e1 | 496 | int ret = 0; |
baf20995 | 497 | |
4ac10b76 | 498 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
499 | if (chan_fd < 0) { |
500 | ret = chan_fd; | |
501 | goto fd_error; | |
502 | } | |
88dfd899 MD |
503 | switch (channel_type) { |
504 | case PER_CPU_CHANNEL: | |
505 | fops = <tng_channel_fops; | |
506 | break; | |
507 | case METADATA_CHANNEL: | |
508 | fops = <tng_metadata_fops; | |
509 | break; | |
510 | } | |
2470a237 | 511 | |
c0e31d2e | 512 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 513 | fops, |
03037b98 | 514 | NULL, O_RDWR); |
c0e31d2e MD |
515 | if (IS_ERR(chan_file)) { |
516 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
517 | goto file_error; |
518 | } | |
5dbbdb43 MD |
519 | switch (channel_type) { |
520 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
521 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
522 | transport_name = chan_param->overwrite ? | |
96ba7208 | 523 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
524 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
525 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
526 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
527 | } else { | |
528 | return -EINVAL; | |
529 | } | |
5dbbdb43 | 530 | break; |
5dbbdb43 | 531 | case METADATA_CHANNEL: |
6dccd6c1 | 532 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 533 | transport_name = "relay-metadata"; |
6dccd6c1 | 534 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
535 | transport_name = "relay-metadata-mmap"; |
536 | else | |
537 | return -EINVAL; | |
5dbbdb43 MD |
538 | break; |
539 | default: | |
540 | transport_name = "<unknown>"; | |
541 | break; | |
542 | } | |
98d7281c MJ |
543 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
544 | ret = -EOVERFLOW; | |
9c1f4643 MD |
545 | goto refcount_error; |
546 | } | |
03037b98 MD |
547 | /* |
548 | * We tolerate no failure path after channel creation. It will stay | |
549 | * invariant for the rest of the session. | |
550 | */ | |
a90917c3 | 551 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
552 | chan_param->subbuf_size, |
553 | chan_param->num_subbuf, | |
554 | chan_param->switch_timer_interval, | |
d83004aa JD |
555 | chan_param->read_timer_interval, |
556 | channel_type); | |
03037b98 | 557 | if (!chan) { |
f3d01b96 | 558 | ret = -EINVAL; |
03037b98 MD |
559 | goto chan_error; |
560 | } | |
11b5a3c2 | 561 | chan->file = chan_file; |
c0e31d2e MD |
562 | chan_file->private_data = chan; |
563 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 564 | |
baf20995 MD |
565 | return chan_fd; |
566 | ||
03037b98 | 567 | chan_error: |
9c1f4643 MD |
568 | atomic_long_dec(&session_file->f_count); |
569 | refcount_error: | |
c0e31d2e | 570 | fput(chan_file); |
baf20995 MD |
571 | file_error: |
572 | put_unused_fd(chan_fd); | |
573 | fd_error: | |
baf20995 MD |
574 | return ret; |
575 | } | |
576 | ||
7f859fbf JR |
577 | static |
578 | int lttng_abi_session_set_name(struct lttng_session *session, | |
579 | struct lttng_kernel_session_name *name) | |
580 | { | |
581 | size_t len; | |
582 | ||
583 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
584 | ||
585 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
586 | /* Name is too long/malformed */ | |
587 | return -EINVAL; | |
588 | } | |
589 | ||
590 | strcpy(session->name, name->name); | |
591 | return 0; | |
592 | } | |
593 | ||
1c88f269 JR |
594 | static |
595 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
596 | struct lttng_kernel_session_creation_time *time) | |
597 | { | |
598 | size_t len; | |
599 | ||
600 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
601 | ||
602 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
603 | /* Time is too long/malformed */ | |
604 | return -EINVAL; | |
605 | } | |
606 | ||
607 | strcpy(session->creation_time, time->iso8601); | |
608 | return 0; | |
609 | } | |
610 | ||
99f52fcc FD |
611 | static |
612 | int lttng_counter_release(struct inode *inode, struct file *file) | |
613 | { | |
614 | struct lttng_counter *counter = file->private_data; | |
615 | ||
616 | if (counter) { | |
617 | /* | |
618 | * Do not destroy the counter itself. Wait of the owner | |
619 | * (event_notifier group) to be destroyed. | |
620 | */ | |
621 | fput(counter->owner); | |
622 | } | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
627 | static | |
628 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
629 | { | |
630 | struct lttng_counter *counter = file->private_data; | |
631 | size_t indexes[LTTNG_KERNEL_COUNTER_DIMENSION_MAX] = { 0 }; | |
632 | int i; | |
633 | ||
634 | switch (cmd) { | |
635 | case LTTNG_KERNEL_COUNTER_READ: | |
636 | { | |
637 | struct lttng_kernel_counter_read local_counter_read; | |
638 | struct lttng_kernel_counter_read __user *ucounter_read = | |
639 | (struct lttng_kernel_counter_read __user *) arg; | |
640 | bool overflow, underflow; | |
641 | int64_t value; | |
642 | int32_t cpu; | |
643 | int ret; | |
644 | ||
645 | if (copy_from_user(&local_counter_read, ucounter_read, | |
646 | sizeof(local_counter_read))) | |
647 | return -EFAULT; | |
648 | if (validate_zeroed_padding(local_counter_read.padding, | |
649 | sizeof(local_counter_read.padding))) | |
650 | return -EINVAL; | |
651 | ||
652 | /* Cast all indexes into size_t. */ | |
653 | for (i = 0; i < local_counter_read.index.number_dimensions; i++) | |
654 | indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i]; | |
655 | cpu = local_counter_read.cpu; | |
656 | ||
657 | ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, | |
658 | &overflow, &underflow); | |
659 | if (ret) | |
660 | return ret; | |
661 | local_counter_read.value.value = value; | |
662 | local_counter_read.value.overflow = overflow; | |
663 | local_counter_read.value.underflow = underflow; | |
664 | ||
665 | if (copy_to_user(&ucounter_read->value, &local_counter_read.value, | |
666 | sizeof(local_counter_read.value))) | |
667 | return -EFAULT; | |
668 | ||
669 | return 0; | |
670 | } | |
671 | case LTTNG_KERNEL_COUNTER_AGGREGATE: | |
672 | { | |
673 | struct lttng_kernel_counter_aggregate local_counter_aggregate; | |
674 | struct lttng_kernel_counter_aggregate __user *ucounter_aggregate = | |
675 | (struct lttng_kernel_counter_aggregate __user *) arg; | |
676 | bool overflow, underflow; | |
677 | int64_t value; | |
678 | int ret; | |
679 | ||
680 | if (copy_from_user(&local_counter_aggregate, ucounter_aggregate, | |
681 | sizeof(local_counter_aggregate))) | |
682 | return -EFAULT; | |
683 | if (validate_zeroed_padding(local_counter_aggregate.padding, | |
684 | sizeof(local_counter_aggregate.padding))) | |
685 | return -EINVAL; | |
686 | ||
687 | /* Cast all indexes into size_t. */ | |
688 | for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++) | |
689 | indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i]; | |
690 | ||
691 | ret = lttng_kernel_counter_aggregate(counter, indexes, &value, | |
692 | &overflow, &underflow); | |
693 | if (ret) | |
694 | return ret; | |
695 | local_counter_aggregate.value.value = value; | |
696 | local_counter_aggregate.value.overflow = overflow; | |
697 | local_counter_aggregate.value.underflow = underflow; | |
698 | ||
699 | if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value, | |
700 | sizeof(local_counter_aggregate.value))) | |
701 | return -EFAULT; | |
702 | ||
703 | return 0; | |
704 | } | |
705 | case LTTNG_KERNEL_COUNTER_CLEAR: | |
706 | { | |
707 | struct lttng_kernel_counter_clear local_counter_clear; | |
708 | struct lttng_kernel_counter_clear __user *ucounter_clear = | |
709 | (struct lttng_kernel_counter_clear __user *) arg; | |
710 | ||
711 | if (copy_from_user(&local_counter_clear, ucounter_clear, | |
712 | sizeof(local_counter_clear))) | |
713 | return -EFAULT; | |
714 | if (validate_zeroed_padding(local_counter_clear.padding, | |
715 | sizeof(local_counter_clear.padding))) | |
716 | return -EINVAL; | |
717 | ||
718 | /* Cast all indexes into size_t. */ | |
719 | for (i = 0; i < local_counter_clear.index.number_dimensions; i++) | |
720 | indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i]; | |
721 | ||
722 | return lttng_kernel_counter_clear(counter, indexes); | |
723 | } | |
724 | default: | |
725 | WARN_ON_ONCE(1); | |
726 | return -ENOSYS; | |
727 | } | |
728 | } | |
729 | ||
730 | static const struct file_operations lttng_counter_fops = { | |
731 | .owner = THIS_MODULE, | |
732 | .release = lttng_counter_release, | |
733 | .unlocked_ioctl = lttng_counter_ioctl, | |
734 | #ifdef CONFIG_COMPAT | |
735 | .compat_ioctl = lttng_counter_ioctl, | |
736 | #endif | |
737 | }; | |
738 | ||
739 | ||
d1f652f8 MD |
740 | static |
741 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
742 | { | |
743 | switch (tracker->type) { | |
744 | case LTTNG_KERNEL_TRACKER_PID: | |
745 | return TRACKER_PID; | |
746 | case LTTNG_KERNEL_TRACKER_VPID: | |
747 | return TRACKER_VPID; | |
748 | case LTTNG_KERNEL_TRACKER_UID: | |
749 | return TRACKER_UID; | |
750 | case LTTNG_KERNEL_TRACKER_VUID: | |
751 | return TRACKER_VUID; | |
752 | case LTTNG_KERNEL_TRACKER_GID: | |
753 | return TRACKER_GID; | |
754 | case LTTNG_KERNEL_TRACKER_VGID: | |
755 | return TRACKER_VGID; | |
756 | default: | |
757 | return TRACKER_UNKNOWN; | |
758 | } | |
759 | } | |
760 | ||
baf20995 | 761 | /** |
ad1c05e1 | 762 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 763 | * |
c0e31d2e | 764 | * @file: the file |
baf20995 MD |
765 | * @cmd: the command |
766 | * @arg: command arg | |
767 | * | |
768 | * This ioctl implements lttng commands: | |
38d024ae | 769 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 770 | * Returns a LTTng channel file descriptor |
e64957da MD |
771 | * LTTNG_KERNEL_ENABLE |
772 | * Enables tracing for a session (weak enable) | |
773 | * LTTNG_KERNEL_DISABLE | |
774 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
775 | * LTTNG_KERNEL_METADATA |
776 | * Returns a LTTng metadata file descriptor | |
e0130fab | 777 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 778 | * Add PID to session PID tracker |
e0130fab | 779 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
780 | * Remove PID from session PID tracker |
781 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
782 | * Add ID to tracker | |
783 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
784 | * Remove ID from tracker | |
ad1c05e1 MD |
785 | * |
786 | * The returned channel will be deleted when its file descriptor is closed. | |
787 | */ | |
788 | static | |
c0e31d2e | 789 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 790 | { |
a90917c3 | 791 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
792 | struct lttng_kernel_channel chan_param; |
793 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 794 | |
ad1c05e1 | 795 | switch (cmd) { |
6dccd6c1 JD |
796 | case LTTNG_KERNEL_OLD_CHANNEL: |
797 | { | |
6dccd6c1 JD |
798 | if (copy_from_user(&old_chan_param, |
799 | (struct lttng_kernel_old_channel __user *) arg, | |
800 | sizeof(struct lttng_kernel_old_channel))) | |
801 | return -EFAULT; | |
802 | chan_param.overwrite = old_chan_param.overwrite; | |
803 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
804 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
805 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
806 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
807 | chan_param.output = old_chan_param.output; | |
808 | ||
809 | return lttng_abi_create_channel(file, &chan_param, | |
810 | PER_CPU_CHANNEL); | |
811 | } | |
38d024ae | 812 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 813 | { |
6dccd6c1 | 814 | if (copy_from_user(&chan_param, |
38d024ae | 815 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
816 | sizeof(struct lttng_kernel_channel))) |
817 | return -EFAULT; | |
818 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 819 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
820 | } |
821 | case LTTNG_KERNEL_OLD_SESSION_START: | |
822 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 823 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 824 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 825 | return lttng_session_enable(session); |
6dccd6c1 JD |
826 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
827 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 828 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 829 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 830 | return lttng_session_disable(session); |
6dccd6c1 JD |
831 | case LTTNG_KERNEL_OLD_METADATA: |
832 | { | |
6dccd6c1 JD |
833 | if (copy_from_user(&old_chan_param, |
834 | (struct lttng_kernel_old_channel __user *) arg, | |
835 | sizeof(struct lttng_kernel_old_channel))) | |
836 | return -EFAULT; | |
837 | chan_param.overwrite = old_chan_param.overwrite; | |
838 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
839 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
840 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
841 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
842 | chan_param.output = old_chan_param.output; | |
843 | ||
844 | return lttng_abi_create_channel(file, &chan_param, | |
845 | METADATA_CHANNEL); | |
846 | } | |
38d024ae | 847 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 848 | { |
6dccd6c1 JD |
849 | if (copy_from_user(&chan_param, |
850 | (struct lttng_kernel_channel __user *) arg, | |
851 | sizeof(struct lttng_kernel_channel))) | |
852 | return -EFAULT; | |
853 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 854 | METADATA_CHANNEL); |
6dccd6c1 | 855 | } |
e0130fab | 856 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 857 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 858 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
859 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
860 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
861 | { | |
862 | struct lttng_kernel_tracker_args tracker; | |
863 | enum tracker_type tracker_type; | |
864 | ||
865 | if (copy_from_user(&tracker, | |
866 | (struct lttng_kernel_tracker_args __user *) arg, | |
867 | sizeof(struct lttng_kernel_tracker_args))) | |
868 | return -EFAULT; | |
869 | tracker_type = get_tracker_type(&tracker); | |
870 | if (tracker_type == TRACKER_UNKNOWN) | |
871 | return -EINVAL; | |
872 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
873 | } | |
874 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
875 | { | |
876 | struct lttng_kernel_tracker_args tracker; | |
877 | enum tracker_type tracker_type; | |
878 | ||
879 | if (copy_from_user(&tracker, | |
880 | (struct lttng_kernel_tracker_args __user *) arg, | |
881 | sizeof(struct lttng_kernel_tracker_args))) | |
882 | return -EFAULT; | |
883 | tracker_type = get_tracker_type(&tracker); | |
884 | if (tracker_type == TRACKER_UNKNOWN) | |
885 | return -EINVAL; | |
886 | return lttng_session_untrack_id(session, tracker_type, | |
887 | tracker.id); | |
888 | } | |
7e6f9ef6 | 889 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
890 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
891 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
892 | { | |
893 | struct lttng_kernel_tracker_args tracker; | |
894 | enum tracker_type tracker_type; | |
895 | ||
896 | if (copy_from_user(&tracker, | |
897 | (struct lttng_kernel_tracker_args __user *) arg, | |
898 | sizeof(struct lttng_kernel_tracker_args))) | |
899 | return -EFAULT; | |
900 | tracker_type = get_tracker_type(&tracker); | |
901 | if (tracker_type == TRACKER_UNKNOWN) | |
902 | return -EINVAL; | |
903 | return lttng_session_list_tracker_ids(session, tracker_type); | |
904 | } | |
9616f0bf JD |
905 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
906 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
907 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
908 | return lttng_session_statedump(session); | |
7f859fbf JR |
909 | case LTTNG_KERNEL_SESSION_SET_NAME: |
910 | { | |
911 | struct lttng_kernel_session_name name; | |
912 | ||
913 | if (copy_from_user(&name, | |
914 | (struct lttng_kernel_session_name __user *) arg, | |
915 | sizeof(struct lttng_kernel_session_name))) | |
916 | return -EFAULT; | |
917 | return lttng_abi_session_set_name(session, &name); | |
918 | } | |
1c88f269 JR |
919 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
920 | { | |
921 | struct lttng_kernel_session_creation_time time; | |
922 | ||
923 | if (copy_from_user(&time, | |
924 | (struct lttng_kernel_session_creation_time __user *) arg, | |
925 | sizeof(struct lttng_kernel_session_creation_time))) | |
926 | return -EFAULT; | |
927 | return lttng_abi_session_set_creation_time(session, &time); | |
928 | } | |
ad1c05e1 MD |
929 | default: |
930 | return -ENOIOCTLCMD; | |
931 | } | |
932 | } | |
933 | ||
03037b98 MD |
934 | /* |
935 | * Called when the last file reference is dropped. | |
936 | * | |
937 | * Big fat note: channels and events are invariant for the whole session after | |
938 | * their creation. So this session destruction also destroys all channel and | |
939 | * event structures specific to this session (they are not destroyed when their | |
940 | * individual file is released). | |
941 | */ | |
ad1c05e1 | 942 | static |
03037b98 | 943 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 944 | { |
a90917c3 | 945 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
946 | |
947 | if (session) | |
a90917c3 | 948 | lttng_session_destroy(session); |
11b5a3c2 | 949 | return 0; |
ad1c05e1 | 950 | } |
ad1c05e1 MD |
951 | |
952 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 953 | .owner = THIS_MODULE, |
03037b98 | 954 | .release = lttng_session_release, |
ad1c05e1 MD |
955 | .unlocked_ioctl = lttng_session_ioctl, |
956 | #ifdef CONFIG_COMPAT | |
03037b98 | 957 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 958 | #endif |
11b5a3c2 | 959 | }; |
ad1c05e1 | 960 | |
db2511b4 MD |
961 | /* |
962 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
963 | * and retry (if new data available to read after flush). | |
964 | */ | |
965 | static | |
966 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
967 | size_t count, loff_t *ppos) | |
968 | { | |
969 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
970 | struct channel *chan = event_notifier_group->chan; | |
971 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
972 | ssize_t read_count = 0, len; | |
973 | size_t read_offset; | |
974 | ||
975 | might_sleep(); | |
976 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
977 | return -EFAULT; | |
978 | ||
979 | /* Finish copy of previous record */ | |
980 | if (*ppos != 0) { | |
981 | if (read_count < count) { | |
982 | len = chan->iter.len_left; | |
983 | read_offset = *ppos; | |
984 | goto skip_get_next; | |
985 | } | |
986 | } | |
987 | ||
988 | while (read_count < count) { | |
989 | size_t copy_len, space_left; | |
990 | ||
991 | len = lib_ring_buffer_get_next_record(chan, buf); | |
992 | len_test: | |
993 | if (len < 0) { | |
994 | /* | |
995 | * Check if buffer is finalized (end of file). | |
996 | */ | |
997 | if (len == -ENODATA) { | |
998 | /* A 0 read_count will tell about end of file */ | |
999 | goto nodata; | |
1000 | } | |
1001 | if (filp->f_flags & O_NONBLOCK) { | |
1002 | if (!read_count) | |
1003 | read_count = -EAGAIN; | |
1004 | goto nodata; | |
1005 | } else { | |
1006 | int error; | |
1007 | ||
1008 | /* | |
1009 | * No data available at the moment, return what | |
1010 | * we got. | |
1011 | */ | |
1012 | if (read_count) | |
1013 | goto nodata; | |
1014 | ||
1015 | /* | |
1016 | * Wait for returned len to be >= 0 or -ENODATA. | |
1017 | */ | |
1018 | error = wait_event_interruptible( | |
1019 | event_notifier_group->read_wait, | |
1020 | ((len = lib_ring_buffer_get_next_record( | |
1021 | chan, buf)), len != -EAGAIN)); | |
1022 | CHAN_WARN_ON(chan, len == -EBUSY); | |
1023 | if (error) { | |
1024 | read_count = error; | |
1025 | goto nodata; | |
1026 | } | |
1027 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
1028 | goto len_test; | |
1029 | } | |
1030 | } | |
1031 | read_offset = buf->iter.read_offset; | |
1032 | skip_get_next: | |
1033 | space_left = count - read_count; | |
1034 | if (len <= space_left) { | |
1035 | copy_len = len; | |
1036 | chan->iter.len_left = 0; | |
1037 | *ppos = 0; | |
1038 | } else { | |
1039 | copy_len = space_left; | |
1040 | chan->iter.len_left = len - copy_len; | |
1041 | *ppos = read_offset + copy_len; | |
1042 | } | |
1043 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
1044 | &user_buf[read_count], | |
1045 | copy_len)) { | |
1046 | /* | |
1047 | * Leave the len_left and ppos values at their current | |
1048 | * state, as we currently have a valid event to read. | |
1049 | */ | |
1050 | return -EFAULT; | |
1051 | } | |
1052 | read_count += copy_len; | |
1053 | } | |
31c02fb7 | 1054 | goto put_record; |
db2511b4 MD |
1055 | |
1056 | nodata: | |
1057 | *ppos = 0; | |
1058 | chan->iter.len_left = 0; | |
31c02fb7 MD |
1059 | |
1060 | put_record: | |
1061 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1062 | return read_count; |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1067 | * there is data available. Perform a ring buffer flush if we encounter a | |
1068 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1069 | */ | |
1070 | static | |
1071 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1072 | poll_table *wait) | |
1073 | { | |
1074 | unsigned int mask = 0; | |
1075 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
1076 | struct channel *chan = event_notifier_group->chan; | |
1077 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1078 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1079 | int finalized, disabled; | |
1080 | unsigned long consumed, offset; | |
18f12d55 | 1081 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1082 | |
1083 | if (filp->f_mode & FMODE_READ) { | |
1084 | poll_wait_set_exclusive(wait); | |
1085 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1086 | ||
1087 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1088 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1089 | ||
1090 | /* | |
1091 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1092 | * finalized load before offsets loads. | |
1093 | */ | |
1094 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1095 | retry: | |
1096 | if (disabled) | |
1097 | return POLLERR; | |
1098 | ||
1099 | offset = lib_ring_buffer_get_offset(config, buf); | |
1100 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1101 | ||
1102 | /* | |
1103 | * If there is no buffer available to consume. | |
1104 | */ | |
1105 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1106 | /* | |
1107 | * If there is a non-empty subbuffer, flush and try again. | |
1108 | */ | |
18f12d55 | 1109 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1110 | lib_ring_buffer_switch_remote(buf); |
1111 | goto retry; | |
1112 | } | |
1113 | ||
1114 | if (finalized) | |
1115 | return POLLHUP; | |
1116 | else { | |
1117 | /* | |
1118 | * The memory barriers | |
1119 | * __wait_event()/wake_up_interruptible() take | |
1120 | * care of "raw_spin_is_locked" memory ordering. | |
1121 | */ | |
1122 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1123 | goto retry; | |
1124 | else | |
1125 | return 0; | |
1126 | } | |
1127 | } else { | |
1128 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1129 | >= chan->backend.buf_size) | |
1130 | return POLLPRI | POLLRDBAND; | |
1131 | else | |
1132 | return POLLIN | POLLRDNORM; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | return mask; | |
1137 | } | |
1138 | ||
1139 | /** | |
1140 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1141 | * @inode: opened inode | |
1142 | * @file: opened file | |
1143 | * | |
1144 | * Open implementation. Makes sure only one open instance of a buffer is | |
1145 | * done at a given moment. | |
1146 | */ | |
1147 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1148 | { | |
1149 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
1150 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1151 | ||
1152 | file->private_data = event_notifier_group; | |
1153 | return lib_ring_buffer_open(inode, file, buf); | |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1158 | * @inode: opened inode | |
1159 | * @file: opened file | |
1160 | * | |
1161 | * Release implementation. | |
1162 | */ | |
1163 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1164 | { | |
1165 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
1166 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1167 | int ret; | |
1168 | ||
1169 | ret = lib_ring_buffer_release(inode, file, buf); | |
1170 | if (ret) | |
1171 | return ret; | |
1172 | fput(event_notifier_group->file); | |
1173 | return 0; | |
1174 | } | |
1175 | ||
21f58fb7 FD |
1176 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1177 | .owner = THIS_MODULE, | |
db2511b4 MD |
1178 | .open = lttng_event_notifier_group_notif_open, |
1179 | .release = lttng_event_notifier_group_notif_release, | |
1180 | .read = lttng_event_notifier_group_notif_read, | |
1181 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1182 | }; |
1183 | ||
d83004aa JD |
1184 | /** |
1185 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1186 | * @filp: the file | |
1187 | * @wait: poll table | |
1188 | * | |
1189 | * Handles the poll operations for the metadata channels. | |
1190 | */ | |
ad1c05e1 | 1191 | static |
d83004aa JD |
1192 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1193 | poll_table *wait) | |
1194 | { | |
1195 | struct lttng_metadata_stream *stream = filp->private_data; | |
1196 | struct lib_ring_buffer *buf = stream->priv; | |
1197 | int finalized; | |
1198 | unsigned int mask = 0; | |
1199 | ||
1200 | if (filp->f_mode & FMODE_READ) { | |
1201 | poll_wait_set_exclusive(wait); | |
1202 | poll_wait(filp, &stream->read_wait, wait); | |
1203 | ||
1204 | finalized = stream->finalized; | |
1205 | ||
1206 | /* | |
1207 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1208 | * ordering finalized load before offsets loads. | |
1209 | */ | |
1210 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1211 | ||
1212 | if (finalized) | |
1213 | mask |= POLLHUP; | |
1214 | ||
92d9f5e6 | 1215 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1216 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1217 | stream->metadata_out) |
d83004aa | 1218 | mask |= POLLIN; |
92d9f5e6 | 1219 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1220 | } |
1221 | ||
1222 | return mask; | |
1223 | } | |
1224 | ||
f613e3e6 MD |
1225 | static |
1226 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1227 | unsigned int cmd, unsigned long arg) | |
1228 | { | |
1229 | struct lttng_metadata_stream *stream = filp->private_data; | |
1230 | ||
1231 | stream->metadata_out = stream->metadata_in; | |
1232 | } | |
1233 | ||
d1344afa JD |
1234 | /* |
1235 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1236 | * the consumer receives the content of the metadata cache unchanged. This is | |
1237 | * different from the metadata_regenerate where the offset from epoch is | |
1238 | * resampled, here we want the exact same content as the last time the metadata | |
1239 | * was generated. This command is only possible if all the metadata written | |
1240 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1241 | * metadata file. | |
1242 | * | |
1243 | * Return 0 on success, a negative value on error. | |
1244 | */ | |
1245 | static | |
1246 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1247 | { | |
1248 | int ret; | |
1249 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1250 | ||
1251 | mutex_lock(&cache->lock); | |
1252 | if (stream->metadata_out != cache->metadata_written) { | |
1253 | ret = -EBUSY; | |
1254 | goto end; | |
1255 | } | |
1256 | stream->metadata_out = 0; | |
1257 | stream->metadata_in = 0; | |
1258 | wake_up_interruptible(&stream->read_wait); | |
1259 | ret = 0; | |
1260 | ||
1261 | end: | |
1262 | mutex_unlock(&cache->lock); | |
1263 | return ret; | |
1264 | } | |
1265 | ||
d83004aa JD |
1266 | static |
1267 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1268 | unsigned int cmd, unsigned long arg) | |
1269 | { | |
1270 | int ret; | |
1271 | struct lttng_metadata_stream *stream = filp->private_data; | |
1272 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1273 | unsigned int rb_cmd; |
1274 | bool coherent; | |
1275 | ||
1276 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1277 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1278 | else | |
1279 | rb_cmd = cmd; | |
d83004aa JD |
1280 | |
1281 | switch (cmd) { | |
d83004aa JD |
1282 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1283 | { | |
35097f36 JD |
1284 | struct lttng_metadata_stream *stream = filp->private_data; |
1285 | struct lib_ring_buffer *buf = stream->priv; | |
1286 | struct channel *chan = buf->backend.chan; | |
1287 | ||
8b97fd42 | 1288 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1289 | if (ret > 0) { |
1290 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1291 | ret = 0; | |
1292 | } else if (ret < 0) | |
d83004aa JD |
1293 | goto err; |
1294 | break; | |
1295 | } | |
f613e3e6 MD |
1296 | case RING_BUFFER_GET_SUBBUF: |
1297 | { | |
1298 | /* | |
1299 | * Random access is not allowed for metadata channel. | |
1300 | */ | |
1301 | return -ENOSYS; | |
1302 | } | |
c6f05468 | 1303 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
1304 | case RING_BUFFER_FLUSH: |
1305 | { | |
1306 | struct lttng_metadata_stream *stream = filp->private_data; | |
1307 | struct lib_ring_buffer *buf = stream->priv; | |
1308 | struct channel *chan = buf->backend.chan; | |
1309 | ||
1310 | /* | |
1311 | * Before doing the actual ring buffer flush, write up to one | |
1312 | * packet of metadata in the ring buffer. | |
1313 | */ | |
8b97fd42 | 1314 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1315 | if (ret < 0) |
1316 | goto err; | |
1317 | break; | |
1318 | } | |
9616f0bf JD |
1319 | case RING_BUFFER_GET_METADATA_VERSION: |
1320 | { | |
1321 | struct lttng_metadata_stream *stream = filp->private_data; | |
1322 | ||
1323 | return put_u64(stream->version, arg); | |
1324 | } | |
d1344afa JD |
1325 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1326 | { | |
1327 | struct lttng_metadata_stream *stream = filp->private_data; | |
1328 | ||
1329 | return lttng_metadata_cache_dump(stream); | |
1330 | } | |
8b97fd42 MD |
1331 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1332 | { | |
1333 | struct lttng_metadata_stream *stream = filp->private_data; | |
1334 | struct lib_ring_buffer *buf = stream->priv; | |
1335 | struct channel *chan = buf->backend.chan; | |
1336 | ||
1337 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1338 | if (ret > 0) { | |
1339 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1340 | ret = 0; | |
1341 | } else if (ret < 0) { | |
1342 | goto err; | |
1343 | } | |
1344 | break; | |
1345 | } | |
d83004aa JD |
1346 | default: |
1347 | break; | |
1348 | } | |
f613e3e6 MD |
1349 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1350 | ||
d83004aa | 1351 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1352 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1353 | if (ret < 0) |
1354 | goto err; | |
d83004aa | 1355 | |
f613e3e6 MD |
1356 | switch (cmd) { |
1357 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1358 | { | |
1359 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1360 | cmd, arg); | |
1361 | break; | |
1362 | } | |
8b97fd42 MD |
1363 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1364 | { | |
1365 | return put_u32(coherent, arg); | |
1366 | } | |
f613e3e6 MD |
1367 | default: |
1368 | break; | |
1369 | } | |
d83004aa JD |
1370 | err: |
1371 | return ret; | |
1372 | } | |
1373 | ||
aeb9064d | 1374 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1375 | static |
1376 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1377 | unsigned int cmd, unsigned long arg) | |
1378 | { | |
1379 | int ret; | |
1380 | struct lttng_metadata_stream *stream = filp->private_data; | |
1381 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1382 | unsigned int rb_cmd; |
1383 | bool coherent; | |
1384 | ||
1385 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1386 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1387 | else | |
1388 | rb_cmd = cmd; | |
d83004aa JD |
1389 | |
1390 | switch (cmd) { | |
d83004aa JD |
1391 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1392 | { | |
35097f36 JD |
1393 | struct lttng_metadata_stream *stream = filp->private_data; |
1394 | struct lib_ring_buffer *buf = stream->priv; | |
1395 | struct channel *chan = buf->backend.chan; | |
1396 | ||
8b97fd42 | 1397 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1398 | if (ret > 0) { |
1399 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1400 | ret = 0; | |
1401 | } else if (ret < 0) | |
d83004aa JD |
1402 | goto err; |
1403 | break; | |
1404 | } | |
f613e3e6 MD |
1405 | case RING_BUFFER_GET_SUBBUF: |
1406 | { | |
1407 | /* | |
1408 | * Random access is not allowed for metadata channel. | |
1409 | */ | |
1410 | return -ENOSYS; | |
1411 | } | |
c6f05468 | 1412 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1413 | case RING_BUFFER_FLUSH: |
1414 | { | |
1415 | struct lttng_metadata_stream *stream = filp->private_data; | |
1416 | struct lib_ring_buffer *buf = stream->priv; | |
1417 | struct channel *chan = buf->backend.chan; | |
1418 | ||
1419 | /* | |
1420 | * Before doing the actual ring buffer flush, write up to one | |
1421 | * packet of metadata in the ring buffer. | |
1422 | */ | |
8b97fd42 | 1423 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1424 | if (ret < 0) |
1425 | goto err; | |
1426 | break; | |
1427 | } | |
1428 | case RING_BUFFER_GET_METADATA_VERSION: | |
1429 | { | |
1430 | struct lttng_metadata_stream *stream = filp->private_data; | |
1431 | ||
1432 | return put_u64(stream->version, arg); | |
1433 | } | |
d1344afa JD |
1434 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1435 | { | |
1436 | struct lttng_metadata_stream *stream = filp->private_data; | |
1437 | ||
1438 | return lttng_metadata_cache_dump(stream); | |
1439 | } | |
8b97fd42 MD |
1440 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1441 | { | |
1442 | struct lttng_metadata_stream *stream = filp->private_data; | |
1443 | struct lib_ring_buffer *buf = stream->priv; | |
1444 | struct channel *chan = buf->backend.chan; | |
1445 | ||
1446 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1447 | if (ret > 0) { | |
1448 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1449 | ret = 0; | |
1450 | } else if (ret < 0) { | |
1451 | goto err; | |
1452 | } | |
1453 | break; | |
1454 | } | |
d83004aa JD |
1455 | default: |
1456 | break; | |
1457 | } | |
f613e3e6 MD |
1458 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1459 | ||
d83004aa | 1460 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1461 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1462 | if (ret < 0) |
1463 | goto err; | |
d83004aa | 1464 | |
f613e3e6 MD |
1465 | switch (cmd) { |
1466 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1467 | { | |
1468 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1469 | cmd, arg); | |
1470 | break; | |
1471 | } | |
8b97fd42 MD |
1472 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1473 | { | |
1474 | return put_u32(coherent, arg); | |
1475 | } | |
f613e3e6 MD |
1476 | default: |
1477 | break; | |
1478 | } | |
d83004aa JD |
1479 | err: |
1480 | return ret; | |
1481 | } | |
aeb9064d | 1482 | #endif |
d83004aa | 1483 | |
b3b8072b MD |
1484 | /* |
1485 | * This is not used by anonymous file descriptors. This code is left | |
1486 | * there if we ever want to implement an inode with open() operation. | |
1487 | */ | |
d83004aa JD |
1488 | static |
1489 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1490 | { | |
1491 | struct lttng_metadata_stream *stream = inode->i_private; | |
1492 | struct lib_ring_buffer *buf = stream->priv; | |
1493 | ||
1494 | file->private_data = buf; | |
b3b8072b MD |
1495 | /* |
1496 | * Since life-time of metadata cache differs from that of | |
1497 | * session, we need to keep our own reference on the transport. | |
1498 | */ | |
1499 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1500 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1501 | return -EBUSY; |
1502 | } | |
d83004aa JD |
1503 | return lib_ring_buffer_open(inode, file, buf); |
1504 | } | |
1505 | ||
1506 | static | |
1507 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1508 | { | |
1509 | struct lttng_metadata_stream *stream = file->private_data; | |
1510 | struct lib_ring_buffer *buf = stream->priv; | |
1511 | ||
92143b2c MD |
1512 | mutex_lock(&stream->metadata_cache->lock); |
1513 | list_del(&stream->list); | |
1514 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1515 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1516 | module_put(stream->transport->owner); |
92143b2c | 1517 | kfree(stream); |
d83004aa JD |
1518 | return lib_ring_buffer_release(inode, file, buf); |
1519 | } | |
1520 | ||
1521 | static | |
1522 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1523 | struct pipe_inode_info *pipe, size_t len, | |
1524 | unsigned int flags) | |
1525 | { | |
1526 | struct lttng_metadata_stream *stream = in->private_data; | |
1527 | struct lib_ring_buffer *buf = stream->priv; | |
1528 | ||
1529 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1530 | flags, buf); | |
1531 | } | |
1532 | ||
1533 | static | |
1534 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1535 | struct vm_area_struct *vma) | |
1536 | { | |
1537 | struct lttng_metadata_stream *stream = filp->private_data; | |
1538 | struct lib_ring_buffer *buf = stream->priv; | |
1539 | ||
1540 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1541 | } | |
1542 | ||
1543 | static | |
1544 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1545 | .owner = THIS_MODULE, | |
1546 | .open = lttng_metadata_ring_buffer_open, | |
1547 | .release = lttng_metadata_ring_buffer_release, | |
1548 | .poll = lttng_metadata_ring_buffer_poll, | |
1549 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1550 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1551 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1552 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1553 | #ifdef CONFIG_COMPAT | |
1554 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1555 | #endif | |
1556 | }; | |
1557 | ||
1558 | static | |
1559 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1560 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1561 | { |
ad1c05e1 | 1562 | int stream_fd, ret; |
11b5a3c2 | 1563 | struct file *stream_file; |
ad1c05e1 | 1564 | |
4ac10b76 | 1565 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1566 | if (stream_fd < 0) { |
1567 | ret = stream_fd; | |
1568 | goto fd_error; | |
1569 | } | |
a3fcd499 | 1570 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1571 | if (IS_ERR(stream_file)) { |
1572 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1573 | goto file_error; |
1574 | } | |
409453cb MD |
1575 | /* |
1576 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1577 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1578 | * file descriptor, so we set FMODE_PREAD here. | |
1579 | */ | |
d7b6f197 | 1580 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1581 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1582 | /* |
1583 | * The stream holds a reference to the channel within the generic ring | |
1584 | * buffer library, so no need to hold a refcount on the channel and | |
1585 | * session files here. | |
1586 | */ | |
ad1c05e1 MD |
1587 | return stream_fd; |
1588 | ||
1589 | file_error: | |
1590 | put_unused_fd(stream_fd); | |
d83004aa JD |
1591 | fd_error: |
1592 | return ret; | |
1593 | } | |
1594 | ||
1595 | static | |
1596 | int lttng_abi_open_stream(struct file *channel_file) | |
1597 | { | |
1598 | struct lttng_channel *channel = channel_file->private_data; | |
1599 | struct lib_ring_buffer *buf; | |
1600 | int ret; | |
1601 | void *stream_priv; | |
1602 | ||
1603 | buf = channel->ops->buffer_read_open(channel->chan); | |
1604 | if (!buf) | |
1605 | return -ENOENT; | |
1606 | ||
1607 | stream_priv = buf; | |
1608 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1609 | <tng_stream_ring_buffer_file_operations, |
1610 | "[lttng_stream]"); | |
d83004aa JD |
1611 | if (ret < 0) |
1612 | goto fd_error; | |
1613 | ||
1614 | return ret; | |
1615 | ||
1616 | fd_error: | |
1617 | channel->ops->buffer_read_close(buf); | |
1618 | return ret; | |
1619 | } | |
1620 | ||
1621 | static | |
1622 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1623 | { | |
1624 | struct lttng_channel *channel = channel_file->private_data; | |
1625 | struct lttng_session *session = channel->session; | |
1626 | struct lib_ring_buffer *buf; | |
1627 | int ret; | |
1628 | struct lttng_metadata_stream *metadata_stream; | |
1629 | void *stream_priv; | |
1630 | ||
1631 | buf = channel->ops->buffer_read_open(channel->chan); | |
1632 | if (!buf) | |
1633 | return -ENOENT; | |
1634 | ||
1635 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1636 | GFP_KERNEL); | |
b3b8072b MD |
1637 | if (!metadata_stream) { |
1638 | ret = -ENOMEM; | |
1639 | goto nomem; | |
1640 | } | |
d83004aa JD |
1641 | metadata_stream->metadata_cache = session->metadata_cache; |
1642 | init_waitqueue_head(&metadata_stream->read_wait); | |
1643 | metadata_stream->priv = buf; | |
1644 | stream_priv = metadata_stream; | |
b3b8072b | 1645 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
1646 | /* Initial state is an empty metadata, considered as incoherent. */ |
1647 | metadata_stream->coherent = false; | |
b3b8072b MD |
1648 | |
1649 | /* | |
1650 | * Since life-time of metadata cache differs from that of | |
1651 | * session, we need to keep our own reference on the transport. | |
1652 | */ | |
1653 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1654 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1655 | ret = -EINVAL; |
1656 | goto notransport; | |
1657 | } | |
1658 | ||
901aaa5f FD |
1659 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1660 | ret = -EOVERFLOW; | |
9c1f4643 | 1661 | goto kref_error; |
901aaa5f FD |
1662 | } |
1663 | ||
d83004aa | 1664 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1665 | <tng_metadata_ring_buffer_file_operations, |
1666 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1667 | if (ret < 0) |
1668 | goto fd_error; | |
1669 | ||
92143b2c | 1670 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1671 | list_add(&metadata_stream->list, |
1672 | &session->metadata_cache->metadata_stream); | |
92143b2c | 1673 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1674 | return ret; |
1675 | ||
ad1c05e1 | 1676 | fd_error: |
9c1f4643 MD |
1677 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1678 | kref_error: | |
b3b8072b MD |
1679 | module_put(metadata_stream->transport->owner); |
1680 | notransport: | |
1681 | kfree(metadata_stream); | |
1682 | nomem: | |
11b5a3c2 | 1683 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1684 | return ret; |
1685 | } | |
1686 | ||
21f58fb7 FD |
1687 | static |
1688 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1689 | { | |
1690 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
1691 | struct channel *chan = event_notifier_group->chan; | |
1692 | struct lib_ring_buffer *buf; | |
1693 | int ret; | |
1694 | void *stream_priv; | |
1695 | ||
1696 | buf = event_notifier_group->ops->buffer_read_open(chan); | |
1697 | if (!buf) | |
1698 | return -ENOENT; | |
1699 | ||
1700 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1701 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1702 | ret = -EOVERFLOW; | |
1703 | goto refcount_error; | |
1704 | } | |
1705 | event_notifier_group->buf = buf; | |
1706 | stream_priv = event_notifier_group; | |
1707 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1708 | <tng_event_notifier_group_notif_fops, | |
1709 | "[lttng_event_notifier_stream]"); | |
1710 | if (ret < 0) | |
1711 | goto fd_error; | |
1712 | ||
1713 | return ret; | |
1714 | ||
1715 | fd_error: | |
1716 | atomic_long_dec(¬if_file->f_count); | |
1717 | refcount_error: | |
1718 | event_notifier_group->ops->buffer_read_close(buf); | |
1719 | return ret; | |
1720 | } | |
1721 | ||
badfe9f5 MD |
1722 | static |
1723 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
1724 | { | |
1725 | /* Limit ABI to implemented features. */ | |
1726 | switch (event_param->instrumentation) { | |
1727 | case LTTNG_KERNEL_SYSCALL: | |
1728 | switch (event_param->u.syscall.entryexit) { | |
2d16d65b MD |
1729 | case LTTNG_KERNEL_SYSCALL_ENTRY: /* Fall-through */ |
1730 | case LTTNG_KERNEL_SYSCALL_EXIT: /* Fall-through */ | |
badfe9f5 MD |
1731 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: |
1732 | break; | |
1733 | default: | |
1734 | return -EINVAL; | |
1735 | } | |
1736 | switch (event_param->u.syscall.abi) { | |
1737 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1738 | break; | |
1739 | default: | |
1740 | return -EINVAL; | |
1741 | } | |
1742 | switch (event_param->u.syscall.match) { | |
cff6938b | 1743 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
badfe9f5 MD |
1744 | break; |
1745 | default: | |
1746 | return -EINVAL; | |
1747 | } | |
1748 | break; | |
1749 | ||
88a82b17 MD |
1750 | case LTTNG_KERNEL_KRETPROBE: |
1751 | switch (event_param->u.kretprobe.entryexit) { | |
1752 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1753 | break; | |
1754 | case LTTNG_KERNEL_SYSCALL_ENTRY: /* Fall-through */ | |
1755 | case LTTNG_KERNEL_SYSCALL_EXIT: /* Fall-through */ | |
1756 | default: | |
1757 | return -EINVAL; | |
1758 | } | |
1759 | break; | |
1760 | ||
b4a75708 MD |
1761 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ |
1762 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
badfe9f5 MD |
1763 | case LTTNG_KERNEL_UPROBE: |
1764 | break; | |
1765 | ||
b4a75708 MD |
1766 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ |
1767 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
badfe9f5 MD |
1768 | default: |
1769 | return -EINVAL; | |
1770 | } | |
1771 | return 0; | |
1772 | } | |
1773 | ||
653fe716 | 1774 | static |
c0e31d2e | 1775 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1776 | struct lttng_kernel_event *event_param) |
653fe716 | 1777 | { |
a90917c3 | 1778 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1779 | int event_fd, ret; |
11b5a3c2 | 1780 | struct file *event_file; |
3c997079 | 1781 | void *priv; |
653fe716 | 1782 | |
6dccd6c1 JD |
1783 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1784 | switch (event_param->instrumentation) { | |
7371f44c | 1785 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1786 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1787 | break; |
ab2277d6 | 1788 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1789 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1790 | break; |
ab2277d6 | 1791 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1792 | WARN_ON_ONCE(1); |
1793 | /* Not implemented. */ | |
e0a7a7c4 MD |
1794 | break; |
1795 | default: | |
1796 | break; | |
1797 | } | |
33a39a3c MD |
1798 | event_fd = lttng_get_unused_fd(); |
1799 | if (event_fd < 0) { | |
1800 | ret = event_fd; | |
1801 | goto fd_error; | |
1802 | } | |
1803 | event_file = anon_inode_getfile("[lttng_event]", | |
1804 | <tng_event_fops, | |
1805 | NULL, O_RDWR); | |
1806 | if (IS_ERR(event_file)) { | |
1807 | ret = PTR_ERR(event_file); | |
1808 | goto file_error; | |
1809 | } | |
9c1f4643 | 1810 | /* The event holds a reference on the channel */ |
98d7281c | 1811 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1812 | ret = -EOVERFLOW; |
9c1f4643 MD |
1813 | goto refcount_error; |
1814 | } | |
badfe9f5 MD |
1815 | ret = lttng_abi_validate_event_param(event_param); |
1816 | if (ret) | |
1817 | goto event_error; | |
684a1e4d MD |
1818 | |
1819 | switch (event_param->instrumentation) { | |
1820 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ | |
1821 | case LTTNG_KERNEL_SYSCALL: | |
1822 | { | |
b2bc0bc8 | 1823 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1824 | |
4993071a PP |
1825 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1826 | /* | |
1827 | * If the event name is a star globbing pattern, | |
1828 | * we create the special star globbing enabler. | |
1829 | */ | |
b2bc0bc8 | 1830 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1831 | event_param, channel); |
3c997079 | 1832 | } else { |
b2bc0bc8 | 1833 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1834 | event_param, channel); |
1ec65de1 | 1835 | } |
b2bc0bc8 | 1836 | priv = event_enabler; |
684a1e4d MD |
1837 | break; |
1838 | } | |
1839 | ||
1840 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
1841 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
1842 | case LTTNG_KERNEL_UPROBE: | |
1843 | { | |
33a39a3c | 1844 | struct lttng_event *event; |
4ee2453d | 1845 | |
33a39a3c MD |
1846 | /* |
1847 | * We tolerate no failure path after event creation. It | |
1848 | * will stay invariant for the rest of the session. | |
1849 | */ | |
1850 | event = lttng_event_create(channel, event_param, | |
1851 | NULL, NULL, | |
1852 | event_param->instrumentation); | |
1853 | WARN_ON_ONCE(!event); | |
1854 | if (IS_ERR(event)) { | |
1855 | ret = PTR_ERR(event); | |
1856 | goto event_error; | |
80f87dd2 | 1857 | } |
33a39a3c | 1858 | priv = event; |
684a1e4d MD |
1859 | break; |
1860 | } | |
1861 | ||
1862 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
1863 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
1864 | default: | |
1865 | ret = -EINVAL; | |
1866 | goto event_error; | |
03037b98 | 1867 | } |
33a39a3c MD |
1868 | event_file->private_data = priv; |
1869 | fd_install(event_fd, event_file); | |
653fe716 MD |
1870 | return event_fd; |
1871 | ||
03037b98 | 1872 | event_error: |
9c1f4643 MD |
1873 | atomic_long_dec(&channel_file->f_count); |
1874 | refcount_error: | |
c0e31d2e | 1875 | fput(event_file); |
653fe716 MD |
1876 | file_error: |
1877 | put_unused_fd(event_fd); | |
1878 | fd_error: | |
653fe716 MD |
1879 | return ret; |
1880 | } | |
ad1c05e1 | 1881 | |
dffef45d FD |
1882 | static |
1883 | long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1884 | { | |
2b16f0c9 | 1885 | struct lttng_event_notifier *event_notifier; |
dffef45d FD |
1886 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
1887 | enum lttng_event_type *evtype = file->private_data; | |
1888 | ||
1889 | switch (cmd) { | |
1890 | case LTTNG_KERNEL_ENABLE: | |
1891 | switch (*evtype) { | |
1892 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
1893 | event_notifier = file->private_data; |
1894 | return lttng_event_notifier_enable(event_notifier); | |
dffef45d FD |
1895 | case LTTNG_TYPE_ENABLER: |
1896 | event_notifier_enabler = file->private_data; | |
1897 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
1898 | default: | |
1899 | WARN_ON_ONCE(1); | |
1900 | return -ENOSYS; | |
1901 | } | |
1902 | case LTTNG_KERNEL_DISABLE: | |
1903 | switch (*evtype) { | |
1904 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
1905 | event_notifier = file->private_data; |
1906 | return lttng_event_notifier_disable(event_notifier); | |
dffef45d FD |
1907 | case LTTNG_TYPE_ENABLER: |
1908 | event_notifier_enabler = file->private_data; | |
1909 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
1910 | default: | |
1911 | WARN_ON_ONCE(1); | |
1912 | return -ENOSYS; | |
1913 | } | |
1914 | case LTTNG_KERNEL_FILTER: | |
1915 | switch (*evtype) { | |
1916 | case LTTNG_TYPE_EVENT: | |
1917 | return -EINVAL; | |
1918 | case LTTNG_TYPE_ENABLER: | |
1919 | event_notifier_enabler = file->private_data; | |
183e8b3a FD |
1920 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
1921 | event_notifier_enabler, | |
dffef45d FD |
1922 | (struct lttng_kernel_filter_bytecode __user *) arg); |
1923 | default: | |
1924 | WARN_ON_ONCE(1); | |
1925 | return -ENOSYS; | |
1926 | } | |
99d223ad FD |
1927 | |
1928 | case LTTNG_KERNEL_CAPTURE: | |
1929 | switch (*evtype) { | |
1930 | case LTTNG_TYPE_EVENT: | |
1931 | return -EINVAL; | |
1932 | case LTTNG_TYPE_ENABLER: | |
1933 | event_notifier_enabler = file->private_data; | |
1934 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
1935 | event_notifier_enabler, | |
1936 | (struct lttng_kernel_capture_bytecode __user *) arg); | |
1937 | default: | |
1938 | WARN_ON_ONCE(1); | |
1939 | return -ENOSYS; | |
1940 | } | |
9de67196 FD |
1941 | case LTTNG_KERNEL_ADD_CALLSITE: |
1942 | switch (*evtype) { | |
1943 | case LTTNG_TYPE_EVENT: | |
1944 | event_notifier = file->private_data; | |
1945 | return lttng_event_notifier_add_callsite(event_notifier, | |
1946 | (struct lttng_kernel_event_callsite __user *) arg); | |
1947 | case LTTNG_TYPE_ENABLER: | |
1948 | return -EINVAL; | |
1949 | default: | |
1950 | WARN_ON_ONCE(1); | |
1951 | return -ENOSYS; | |
1952 | } | |
dffef45d FD |
1953 | default: |
1954 | return -ENOIOCTLCMD; | |
1955 | } | |
1956 | } | |
1957 | ||
1958 | static | |
1959 | int lttng_event_notifier_release(struct inode *inode, struct file *file) | |
1960 | { | |
1961 | struct lttng_event_notifier *event_notifier; | |
1962 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1963 | enum lttng_event_type *evtype = file->private_data; | |
1964 | ||
1965 | if (!evtype) | |
1966 | return 0; | |
1967 | ||
1968 | switch (*evtype) { | |
1969 | case LTTNG_TYPE_EVENT: | |
1970 | event_notifier = file->private_data; | |
1971 | if (event_notifier) | |
1972 | fput(event_notifier->group->file); | |
1973 | break; | |
1974 | case LTTNG_TYPE_ENABLER: | |
1975 | event_notifier_enabler = file->private_data; | |
1976 | if (event_notifier_enabler) | |
1977 | fput(event_notifier_enabler->group->file); | |
1978 | break; | |
1979 | default: | |
1980 | WARN_ON_ONCE(1); | |
1981 | break; | |
1982 | } | |
1983 | ||
1984 | return 0; | |
1985 | } | |
1986 | ||
1987 | static const struct file_operations lttng_event_notifier_fops = { | |
1988 | .owner = THIS_MODULE, | |
1989 | .release = lttng_event_notifier_release, | |
1990 | .unlocked_ioctl = lttng_event_notifier_ioctl, | |
1991 | #ifdef CONFIG_COMPAT | |
1992 | .compat_ioctl = lttng_event_notifier_ioctl, | |
1993 | #endif | |
1994 | }; | |
1995 | ||
1996 | static | |
1997 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
1998 | struct lttng_kernel_event_notifier *event_notifier_param) | |
1999 | { | |
2000 | struct lttng_event_notifier_group *event_notifier_group = | |
2001 | event_notifier_group_file->private_data; | |
2002 | int event_notifier_fd, ret; | |
2003 | struct file *event_notifier_file; | |
2004 | void *priv; | |
2005 | ||
2006 | switch (event_notifier_param->event.instrumentation) { | |
2007 | case LTTNG_KERNEL_TRACEPOINT: | |
9de67196 | 2008 | case LTTNG_KERNEL_UPROBE: |
b01155ba | 2009 | break; |
dffef45d | 2010 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
2011 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
2012 | break; | |
8a8ac9a8 FD |
2013 | case LTTNG_KERNEL_SYSCALL: |
2014 | break; | |
dffef45d | 2015 | case LTTNG_KERNEL_KRETPROBE: |
9de67196 | 2016 | /* Placing an event notifier on kretprobe is not supported. */ |
dffef45d FD |
2017 | case LTTNG_KERNEL_FUNCTION: |
2018 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
2019 | default: |
2020 | ret = -EINVAL; | |
2021 | goto inval_instr; | |
2022 | } | |
2023 | ||
2024 | event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2025 | ||
2026 | event_notifier_fd = lttng_get_unused_fd(); | |
2027 | if (event_notifier_fd < 0) { | |
2028 | ret = event_notifier_fd; | |
2029 | goto fd_error; | |
2030 | } | |
2031 | ||
2032 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
2033 | <tng_event_notifier_fops, | |
2034 | NULL, O_RDWR); | |
2035 | if (IS_ERR(event_notifier_file)) { | |
2036 | ret = PTR_ERR(event_notifier_file); | |
2037 | goto file_error; | |
2038 | } | |
2039 | ||
2040 | /* The event notifier holds a reference on the event notifier group. */ | |
2041 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2042 | ret = -EOVERFLOW; | |
2043 | goto refcount_error; | |
2044 | } | |
2045 | ||
56237619 MD |
2046 | ret = lttng_abi_validate_event_param(&event_notifier_param->event); |
2047 | if (ret) | |
2048 | goto event_notifier_error; | |
2049 | ||
684a1e4d MD |
2050 | switch (event_notifier_param->event.instrumentation) { |
2051 | case LTTNG_KERNEL_TRACEPOINT: /* Fall-through */ | |
2052 | case LTTNG_KERNEL_SYSCALL: | |
2053 | { | |
dffef45d FD |
2054 | struct lttng_event_notifier_enabler *enabler; |
2055 | ||
2056 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2057 | /* | |
2058 | * If the event name is a star globbing pattern, | |
2059 | * we create the special star globbing enabler. | |
2060 | */ | |
2061 | enabler = lttng_event_notifier_enabler_create( | |
2062 | event_notifier_group, | |
2063 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
2064 | event_notifier_param); | |
2065 | } else { | |
2066 | enabler = lttng_event_notifier_enabler_create( | |
2067 | event_notifier_group, | |
2068 | LTTNG_ENABLER_FORMAT_NAME, | |
2069 | event_notifier_param); | |
2070 | } | |
2071 | priv = enabler; | |
684a1e4d MD |
2072 | break; |
2073 | } | |
2074 | ||
2075 | case LTTNG_KERNEL_KPROBE: /* Fall-through */ | |
2076 | case LTTNG_KERNEL_KRETPROBE: /* Fall-through */ | |
2077 | case LTTNG_KERNEL_UPROBE: | |
2078 | { | |
dffef45d FD |
2079 | struct lttng_event_notifier *event_notifier; |
2080 | ||
2081 | /* | |
2082 | * We tolerate no failure path after event notifier creation. | |
2083 | * It will stay invariant for the rest of the session. | |
2084 | */ | |
2085 | event_notifier = lttng_event_notifier_create(NULL, | |
99f52fcc FD |
2086 | event_notifier_param->event.token, |
2087 | event_notifier_param->error_counter_index, | |
2088 | event_notifier_group, | |
dffef45d FD |
2089 | event_notifier_param, NULL, |
2090 | event_notifier_param->event.instrumentation); | |
2091 | WARN_ON_ONCE(!event_notifier); | |
2092 | if (IS_ERR(event_notifier)) { | |
2093 | ret = PTR_ERR(event_notifier); | |
2094 | goto event_notifier_error; | |
2095 | } | |
2096 | priv = event_notifier; | |
684a1e4d MD |
2097 | break; |
2098 | } | |
2099 | ||
2100 | case LTTNG_KERNEL_FUNCTION: /* Fall-through */ | |
2101 | case LTTNG_KERNEL_NOOP: /* Fall-through */ | |
2102 | default: | |
2103 | ret = -EINVAL; | |
2104 | goto event_notifier_error; | |
dffef45d FD |
2105 | } |
2106 | event_notifier_file->private_data = priv; | |
2107 | fd_install(event_notifier_fd, event_notifier_file); | |
2108 | return event_notifier_fd; | |
2109 | ||
2110 | event_notifier_error: | |
2111 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2112 | refcount_error: | |
2113 | fput(event_notifier_file); | |
2114 | file_error: | |
2115 | put_unused_fd(event_notifier_fd); | |
2116 | fd_error: | |
2117 | inval_instr: | |
2118 | return ret; | |
2119 | } | |
2120 | ||
99f52fcc FD |
2121 | static |
2122 | long lttng_abi_event_notifier_group_create_error_counter( | |
2123 | struct file *event_notifier_group_file, | |
2124 | const struct lttng_kernel_counter_conf *error_counter_conf) | |
2125 | { | |
2126 | int counter_fd, ret; | |
2127 | char *counter_transport_name; | |
2128 | size_t counter_len; | |
2129 | struct lttng_counter *counter = NULL; | |
2130 | struct file *counter_file; | |
2131 | struct lttng_event_notifier_group *event_notifier_group = | |
2132 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2133 | ||
2134 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) { | |
2135 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); | |
2136 | return -EINVAL; | |
2137 | } | |
2138 | ||
2139 | if (error_counter_conf->number_dimensions != 1) { | |
2140 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2141 | return -EINVAL; | |
2142 | } | |
2143 | ||
2144 | switch (error_counter_conf->bitness) { | |
2145 | case LTTNG_KERNEL_COUNTER_BITNESS_64: | |
2146 | counter_transport_name = "counter-per-cpu-64-modular"; | |
2147 | break; | |
2148 | case LTTNG_KERNEL_COUNTER_BITNESS_32: | |
2149 | counter_transport_name = "counter-per-cpu-32-modular"; | |
2150 | break; | |
2151 | default: | |
2152 | return -EINVAL; | |
2153 | } | |
2154 | ||
2155 | /* | |
2156 | * Lock sessions to provide mutual exclusion against concurrent | |
2157 | * modification of event_notifier group, which would result in | |
2158 | * overwriting the error counter if set concurrently. | |
2159 | */ | |
2160 | lttng_lock_sessions(); | |
2161 | ||
2162 | if (event_notifier_group->error_counter) { | |
2163 | printk(KERN_ERR "Error counter already created in event_notifier group\n"); | |
2164 | ret = -EBUSY; | |
2165 | goto fd_error; | |
2166 | } | |
2167 | ||
2168 | counter_fd = lttng_get_unused_fd(); | |
2169 | if (counter_fd < 0) { | |
2170 | ret = counter_fd; | |
2171 | goto fd_error; | |
2172 | } | |
2173 | ||
2174 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2175 | <tng_counter_fops, | |
2176 | NULL, O_RDONLY); | |
2177 | if (IS_ERR(counter_file)) { | |
2178 | ret = PTR_ERR(counter_file); | |
2179 | goto file_error; | |
2180 | } | |
2181 | ||
2182 | counter_len = error_counter_conf->dimensions[0].size; | |
2183 | ||
2184 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2185 | ret = -EOVERFLOW; | |
2186 | goto refcount_error; | |
2187 | } | |
2188 | ||
2189 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2190 | 1, &counter_len); | |
2191 | if (!counter) { | |
2192 | ret = -EINVAL; | |
2193 | goto counter_error; | |
2194 | } | |
2195 | ||
99f52fcc | 2196 | event_notifier_group->error_counter_len = counter_len; |
ab04d7b1 MD |
2197 | /* |
2198 | * store-release to publish error counter matches load-acquire | |
2199 | * in record_error. Ensures the counter is created and the | |
2200 | * error_counter_len is set before they are used. | |
2201 | */ | |
6657edec | 2202 | lttng_smp_store_release(&event_notifier_group->error_counter, counter); |
99f52fcc FD |
2203 | |
2204 | counter->file = counter_file; | |
2205 | counter->owner = event_notifier_group->file; | |
2206 | counter_file->private_data = counter; | |
2207 | /* Ownership transferred. */ | |
2208 | counter = NULL; | |
2209 | ||
2210 | fd_install(counter_fd, counter_file); | |
2211 | lttng_unlock_sessions(); | |
2212 | ||
2213 | return counter_fd; | |
2214 | ||
2215 | counter_error: | |
2216 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2217 | refcount_error: | |
2218 | fput(counter_file); | |
2219 | file_error: | |
2220 | put_unused_fd(counter_fd); | |
2221 | fd_error: | |
2222 | lttng_unlock_sessions(); | |
2223 | return ret; | |
2224 | } | |
2225 | ||
750b05f2 FD |
2226 | static |
2227 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2228 | unsigned long arg) | |
2229 | { | |
2230 | switch (cmd) { | |
21f58fb7 FD |
2231 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
2232 | { | |
2233 | return lttng_abi_open_event_notifier_group_stream(file); | |
2234 | } | |
dffef45d FD |
2235 | case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE: |
2236 | { | |
2237 | struct lttng_kernel_event_notifier uevent_notifier_param; | |
2238 | ||
2239 | if (copy_from_user(&uevent_notifier_param, | |
2240 | (struct lttng_kernel_event_notifier __user *) arg, | |
2241 | sizeof(uevent_notifier_param))) | |
2242 | return -EFAULT; | |
2243 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2244 | } | |
99f52fcc FD |
2245 | case LTTNG_KERNEL_COUNTER: |
2246 | { | |
2247 | struct lttng_kernel_counter_conf uerror_counter_conf; | |
2248 | ||
2249 | if (copy_from_user(&uerror_counter_conf, | |
2250 | (struct lttng_kernel_counter_conf __user *) arg, | |
2251 | sizeof(uerror_counter_conf))) | |
2252 | return -EFAULT; | |
2253 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2254 | &uerror_counter_conf); | |
2255 | } | |
750b05f2 FD |
2256 | default: |
2257 | return -ENOIOCTLCMD; | |
2258 | } | |
2259 | return 0; | |
2260 | } | |
2261 | ||
2262 | static | |
2263 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2264 | { | |
2265 | struct lttng_event_notifier_group *event_notifier_group = | |
2266 | file->private_data; | |
2267 | ||
2268 | if (event_notifier_group) | |
2269 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2270 | return 0; | |
2271 | } | |
2272 | ||
2273 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2274 | .owner = THIS_MODULE, | |
2275 | .release = lttng_event_notifier_group_release, | |
2276 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2277 | #ifdef CONFIG_COMPAT | |
2278 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2279 | #endif | |
2280 | }; | |
2281 | ||
ad1c05e1 MD |
2282 | /** |
2283 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2284 | * | |
c0e31d2e | 2285 | * @file: the file |
ad1c05e1 MD |
2286 | * @cmd: the command |
2287 | * @arg: command arg | |
2288 | * | |
2289 | * This ioctl implements lttng commands: | |
38d024ae | 2290 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
2291 | * Returns an event stream file descriptor or failure. |
2292 | * (typically, one event stream records events from one CPU) | |
38d024ae | 2293 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 2294 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
2295 | * LTTNG_KERNEL_CONTEXT |
2296 | * Prepend a context field to each event in the channel | |
e64957da MD |
2297 | * LTTNG_KERNEL_ENABLE |
2298 | * Enable recording for events in this channel (weak enable) | |
2299 | * LTTNG_KERNEL_DISABLE | |
2300 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 2301 | * |
baf20995 MD |
2302 | * Channel and event file descriptors also hold a reference on the session. |
2303 | */ | |
ad1c05e1 | 2304 | static |
c0e31d2e | 2305 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2306 | { |
a90917c3 | 2307 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 2308 | |
baf20995 | 2309 | switch (cmd) { |
6dccd6c1 | 2310 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2311 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 2312 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
2313 | case LTTNG_KERNEL_OLD_EVENT: |
2314 | { | |
2315 | struct lttng_kernel_event *uevent_param; | |
2316 | struct lttng_kernel_old_event *old_uevent_param; | |
2317 | int ret; | |
2318 | ||
2319 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
2320 | GFP_KERNEL); | |
2321 | if (!uevent_param) { | |
2322 | ret = -ENOMEM; | |
2323 | goto old_event_end; | |
2324 | } | |
2325 | old_uevent_param = kmalloc( | |
2326 | sizeof(struct lttng_kernel_old_event), | |
2327 | GFP_KERNEL); | |
2328 | if (!old_uevent_param) { | |
2329 | ret = -ENOMEM; | |
2330 | goto old_event_error_free_param; | |
2331 | } | |
2332 | if (copy_from_user(old_uevent_param, | |
2333 | (struct lttng_kernel_old_event __user *) arg, | |
2334 | sizeof(struct lttng_kernel_old_event))) { | |
2335 | ret = -EFAULT; | |
2336 | goto old_event_error_free_old_param; | |
2337 | } | |
2338 | ||
2339 | memcpy(uevent_param->name, old_uevent_param->name, | |
2340 | sizeof(uevent_param->name)); | |
2341 | uevent_param->instrumentation = | |
2342 | old_uevent_param->instrumentation; | |
2343 | ||
2344 | switch (old_uevent_param->instrumentation) { | |
2345 | case LTTNG_KERNEL_KPROBE: | |
2346 | uevent_param->u.kprobe.addr = | |
2347 | old_uevent_param->u.kprobe.addr; | |
2348 | uevent_param->u.kprobe.offset = | |
2349 | old_uevent_param->u.kprobe.offset; | |
2350 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2351 | old_uevent_param->u.kprobe.symbol_name, | |
2352 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2353 | break; | |
2354 | case LTTNG_KERNEL_KRETPROBE: | |
2355 | uevent_param->u.kretprobe.addr = | |
2356 | old_uevent_param->u.kretprobe.addr; | |
2357 | uevent_param->u.kretprobe.offset = | |
2358 | old_uevent_param->u.kretprobe.offset; | |
2359 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2360 | old_uevent_param->u.kretprobe.symbol_name, | |
2361 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2362 | break; | |
2363 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
2364 | WARN_ON_ONCE(1); |
2365 | /* Not implemented. */ | |
6dccd6c1 JD |
2366 | break; |
2367 | default: | |
2368 | break; | |
2369 | } | |
2370 | ret = lttng_abi_create_event(file, uevent_param); | |
2371 | ||
2372 | old_event_error_free_old_param: | |
2373 | kfree(old_uevent_param); | |
2374 | old_event_error_free_param: | |
2375 | kfree(uevent_param); | |
2376 | old_event_end: | |
2377 | return ret; | |
2378 | } | |
38d024ae | 2379 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
2380 | { |
2381 | struct lttng_kernel_event uevent_param; | |
2382 | ||
2383 | if (copy_from_user(&uevent_param, | |
2384 | (struct lttng_kernel_event __user *) arg, | |
2385 | sizeof(uevent_param))) | |
2386 | return -EFAULT; | |
2387 | return lttng_abi_create_event(file, &uevent_param); | |
2388 | } | |
2389 | case LTTNG_KERNEL_OLD_CONTEXT: | |
2390 | { | |
2391 | struct lttng_kernel_context *ucontext_param; | |
2392 | struct lttng_kernel_old_context *old_ucontext_param; | |
2393 | int ret; | |
2394 | ||
2395 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
2396 | GFP_KERNEL); | |
2397 | if (!ucontext_param) { | |
2398 | ret = -ENOMEM; | |
2399 | goto old_ctx_end; | |
2400 | } | |
2401 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
2402 | GFP_KERNEL); | |
2403 | if (!old_ucontext_param) { | |
2404 | ret = -ENOMEM; | |
2405 | goto old_ctx_error_free_param; | |
2406 | } | |
2407 | ||
2408 | if (copy_from_user(old_ucontext_param, | |
2409 | (struct lttng_kernel_old_context __user *) arg, | |
2410 | sizeof(struct lttng_kernel_old_context))) { | |
2411 | ret = -EFAULT; | |
2412 | goto old_ctx_error_free_old_param; | |
2413 | } | |
2414 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2415 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2416 | sizeof(ucontext_param->padding)); | |
2417 | /* only type that uses the union */ | |
2418 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
2419 | ucontext_param->u.perf_counter.type = | |
2420 | old_ucontext_param->u.perf_counter.type; | |
2421 | ucontext_param->u.perf_counter.config = | |
2422 | old_ucontext_param->u.perf_counter.config; | |
2423 | memcpy(ucontext_param->u.perf_counter.name, | |
2424 | old_ucontext_param->u.perf_counter.name, | |
2425 | sizeof(ucontext_param->u.perf_counter.name)); | |
2426 | } | |
2427 | ||
2428 | ret = lttng_abi_add_context(file, | |
2429 | ucontext_param, | |
2430 | &channel->ctx, channel->session); | |
2431 | ||
2432 | old_ctx_error_free_old_param: | |
2433 | kfree(old_ucontext_param); | |
2434 | old_ctx_error_free_param: | |
2435 | kfree(ucontext_param); | |
2436 | old_ctx_end: | |
2437 | return ret; | |
2438 | } | |
8070f5c0 | 2439 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
2440 | { |
2441 | struct lttng_kernel_context ucontext_param; | |
2442 | ||
2443 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 2444 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
2445 | sizeof(ucontext_param))) |
2446 | return -EFAULT; | |
2447 | return lttng_abi_add_context(file, | |
2448 | &ucontext_param, | |
8070f5c0 | 2449 | &channel->ctx, channel->session); |
6dccd6c1 JD |
2450 | } |
2451 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2452 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 2453 | return lttng_channel_enable(channel); |
6dccd6c1 | 2454 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2455 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 2456 | return lttng_channel_disable(channel); |
12e579db MD |
2457 | case LTTNG_KERNEL_SYSCALL_MASK: |
2458 | return lttng_channel_syscall_mask(channel, | |
2459 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
2460 | default: |
2461 | return -ENOIOCTLCMD; | |
2462 | } | |
2463 | } | |
2464 | ||
5dbbdb43 MD |
2465 | /** |
2466 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2467 | * | |
2468 | * @file: the file | |
2469 | * @cmd: the command | |
2470 | * @arg: command arg | |
2471 | * | |
2472 | * This ioctl implements lttng commands: | |
38d024ae | 2473 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
2474 | * Returns an event stream file descriptor or failure. |
2475 | * | |
2476 | * Channel and event file descriptors also hold a reference on the session. | |
2477 | */ | |
2478 | static | |
2479 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2480 | { | |
2481 | switch (cmd) { | |
6dccd6c1 | 2482 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2483 | case LTTNG_KERNEL_STREAM: |
d83004aa | 2484 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2485 | default: |
2486 | return -ENOIOCTLCMD; | |
2487 | } | |
2488 | } | |
2489 | ||
653fe716 MD |
2490 | /** |
2491 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2492 | * | |
c0e31d2e | 2493 | * @file: the file |
653fe716 MD |
2494 | * @wait: poll table |
2495 | */ | |
c0e31d2e | 2496 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2497 | { |
a90917c3 | 2498 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2499 | unsigned int mask = 0; |
2500 | ||
c0e31d2e | 2501 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2502 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2503 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2504 | wait); | |
653fe716 | 2505 | |
254ec7bc MD |
2506 | if (channel->ops->is_disabled(channel->chan)) |
2507 | return POLLERR; | |
24cedcfe | 2508 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2509 | return POLLHUP; |
f71ecafa | 2510 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2511 | return POLLIN | POLLRDNORM; |
f71ecafa | 2512 | return 0; |
653fe716 MD |
2513 | } |
2514 | return mask; | |
2515 | ||
2516 | } | |
2517 | ||
0a84a57f MD |
2518 | static |
2519 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2520 | { | |
a90917c3 | 2521 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
2522 | |
2523 | if (channel) | |
2524 | fput(channel->session->file); | |
0a84a57f MD |
2525 | return 0; |
2526 | } | |
2527 | ||
d83004aa JD |
2528 | static |
2529 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2530 | { | |
2531 | struct lttng_channel *channel = file->private_data; | |
2532 | ||
2533 | if (channel) { | |
d83004aa | 2534 | fput(channel->session->file); |
a3381417 | 2535 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2536 | } |
2537 | ||
2538 | return 0; | |
2539 | } | |
2540 | ||
ad1c05e1 | 2541 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2542 | .owner = THIS_MODULE, |
03037b98 | 2543 | .release = lttng_channel_release, |
653fe716 | 2544 | .poll = lttng_channel_poll, |
ad1c05e1 | 2545 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2546 | #ifdef CONFIG_COMPAT |
03037b98 | 2547 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2548 | #endif |
11b5a3c2 | 2549 | }; |
baf20995 | 2550 | |
5dbbdb43 | 2551 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2552 | .owner = THIS_MODULE, |
d83004aa | 2553 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2554 | .unlocked_ioctl = lttng_metadata_ioctl, |
2555 | #ifdef CONFIG_COMPAT | |
2556 | .compat_ioctl = lttng_metadata_ioctl, | |
2557 | #endif | |
2558 | }; | |
2559 | ||
8070f5c0 MD |
2560 | /** |
2561 | * lttng_event_ioctl - lttng syscall through ioctl | |
2562 | * | |
2563 | * @file: the file | |
2564 | * @cmd: the command | |
2565 | * @arg: command arg | |
2566 | * | |
2567 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
2568 | * LTTNG_KERNEL_CONTEXT |
2569 | * Prepend a context field to each record of this event | |
e64957da MD |
2570 | * LTTNG_KERNEL_ENABLE |
2571 | * Enable recording for this event (weak enable) | |
2572 | * LTTNG_KERNEL_DISABLE | |
2573 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
2574 | */ |
2575 | static | |
2576 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2577 | { | |
3c997079 | 2578 | struct lttng_event *event; |
b2bc0bc8 | 2579 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2580 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
2581 | |
2582 | switch (cmd) { | |
6dccd6c1 JD |
2583 | case LTTNG_KERNEL_OLD_CONTEXT: |
2584 | { | |
3c997079 MD |
2585 | /* Not implemented */ |
2586 | return -ENOSYS; | |
6dccd6c1 | 2587 | } |
8070f5c0 | 2588 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 2589 | { |
3c997079 MD |
2590 | /* Not implemented */ |
2591 | return -ENOSYS; | |
6dccd6c1 JD |
2592 | } |
2593 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2594 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
2595 | switch (*evtype) { |
2596 | case LTTNG_TYPE_EVENT: | |
2597 | event = file->private_data; | |
2598 | return lttng_event_enable(event); | |
2599 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2600 | event_enabler = file->private_data; |
2601 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
2602 | default: |
2603 | WARN_ON_ONCE(1); | |
2604 | return -ENOSYS; | |
2605 | } | |
6dccd6c1 | 2606 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2607 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
2608 | switch (*evtype) { |
2609 | case LTTNG_TYPE_EVENT: | |
2610 | event = file->private_data; | |
2611 | return lttng_event_disable(event); | |
2612 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2613 | event_enabler = file->private_data; |
2614 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
2615 | default: |
2616 | WARN_ON_ONCE(1); | |
2617 | return -ENOSYS; | |
2618 | } | |
07dfc1d0 MD |
2619 | case LTTNG_KERNEL_FILTER: |
2620 | switch (*evtype) { | |
2621 | case LTTNG_TYPE_EVENT: | |
2622 | return -EINVAL; | |
2623 | case LTTNG_TYPE_ENABLER: | |
2624 | { | |
b2bc0bc8 | 2625 | event_enabler = file->private_data; |
183e8b3a FD |
2626 | return lttng_event_enabler_attach_filter_bytecode( |
2627 | event_enabler, | |
07dfc1d0 MD |
2628 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2629 | } | |
0586316f MD |
2630 | default: |
2631 | WARN_ON_ONCE(1); | |
2632 | return -ENOSYS; | |
07dfc1d0 | 2633 | } |
3aed4dca FD |
2634 | case LTTNG_KERNEL_ADD_CALLSITE: |
2635 | switch (*evtype) { | |
2636 | case LTTNG_TYPE_EVENT: | |
2637 | event = file->private_data; | |
2638 | return lttng_event_add_callsite(event, | |
2639 | (struct lttng_kernel_event_callsite __user *) arg); | |
2640 | case LTTNG_TYPE_ENABLER: | |
2641 | return -EINVAL; | |
64c147c0 MD |
2642 | default: |
2643 | WARN_ON_ONCE(1); | |
2644 | return -ENOSYS; | |
3aed4dca | 2645 | } |
8070f5c0 MD |
2646 | default: |
2647 | return -ENOIOCTLCMD; | |
2648 | } | |
2649 | } | |
2650 | ||
0a84a57f MD |
2651 | static |
2652 | int lttng_event_release(struct inode *inode, struct file *file) | |
2653 | { | |
3c997079 | 2654 | struct lttng_event *event; |
b2bc0bc8 | 2655 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2656 | enum lttng_event_type *evtype = file->private_data; |
2657 | ||
2658 | if (!evtype) | |
2659 | return 0; | |
2660 | ||
2661 | switch (*evtype) { | |
2662 | case LTTNG_TYPE_EVENT: | |
2663 | event = file->private_data; | |
2664 | if (event) | |
2665 | fput(event->chan->file); | |
2666 | break; | |
2667 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2668 | event_enabler = file->private_data; |
2669 | if (event_enabler) | |
2670 | fput(event_enabler->chan->file); | |
3c997079 MD |
2671 | break; |
2672 | default: | |
2673 | WARN_ON_ONCE(1); | |
2674 | break; | |
2675 | } | |
c269fff4 | 2676 | |
0a84a57f MD |
2677 | return 0; |
2678 | } | |
2679 | ||
3b923e5b | 2680 | /* TODO: filter control ioctl */ |
0a84a57f | 2681 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 2682 | .owner = THIS_MODULE, |
0a84a57f | 2683 | .release = lttng_event_release, |
8070f5c0 MD |
2684 | .unlocked_ioctl = lttng_event_ioctl, |
2685 | #ifdef CONFIG_COMPAT | |
2686 | .compat_ioctl = lttng_event_ioctl, | |
2687 | #endif | |
11b5a3c2 | 2688 | }; |
0a84a57f | 2689 | |
3b731ab1 JD |
2690 | static int put_u64(uint64_t val, unsigned long arg) |
2691 | { | |
2692 | return put_user(val, (uint64_t __user *) arg); | |
2693 | } | |
2694 | ||
8b97fd42 MD |
2695 | static int put_u32(uint32_t val, unsigned long arg) |
2696 | { | |
2697 | return put_user(val, (uint32_t __user *) arg); | |
2698 | } | |
2699 | ||
ed8d02d6 JD |
2700 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2701 | unsigned int cmd, unsigned long arg) | |
2702 | { | |
3b731ab1 JD |
2703 | struct lib_ring_buffer *buf = filp->private_data; |
2704 | struct channel *chan = buf->backend.chan; | |
2705 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2706 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2707 | int ret; |
2708 | ||
2709 | if (atomic_read(&chan->record_disabled)) | |
2710 | return -EIO; | |
2711 | ||
ed8d02d6 | 2712 | switch (cmd) { |
3b731ab1 JD |
2713 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
2714 | { | |
2715 | uint64_t ts; | |
2716 | ||
dd5a0db3 | 2717 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2718 | if (ret < 0) |
2719 | goto error; | |
2720 | return put_u64(ts, arg); | |
2721 | } | |
2722 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
2723 | { | |
2724 | uint64_t ts; | |
2725 | ||
dd5a0db3 | 2726 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2727 | if (ret < 0) |
2728 | goto error; | |
2729 | return put_u64(ts, arg); | |
2730 | } | |
2731 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
2732 | { | |
2733 | uint64_t ed; | |
2734 | ||
dd5a0db3 | 2735 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2736 | if (ret < 0) |
2737 | goto error; | |
2738 | return put_u64(ed, arg); | |
2739 | } | |
2740 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
2741 | { | |
2742 | uint64_t cs; | |
2743 | ||
dd5a0db3 | 2744 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2745 | if (ret < 0) |
2746 | goto error; | |
2747 | return put_u64(cs, arg); | |
2748 | } | |
2749 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
2750 | { | |
2751 | uint64_t ps; | |
2752 | ||
dd5a0db3 | 2753 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2754 | if (ret < 0) |
2755 | goto error; | |
2756 | return put_u64(ps, arg); | |
2757 | } | |
2758 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
2759 | { | |
2760 | uint64_t si; | |
2761 | ||
dd5a0db3 | 2762 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2763 | if (ret < 0) |
2764 | goto error; | |
2765 | return put_u64(si, arg); | |
2766 | } | |
2348ca17 JD |
2767 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2768 | { | |
2769 | uint64_t ts; | |
2770 | ||
dd5a0db3 | 2771 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2772 | if (ret < 0) |
2773 | goto error; | |
2774 | return put_u64(ts, arg); | |
2775 | } | |
5b3cf4f9 JD |
2776 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
2777 | { | |
2778 | uint64_t seq; | |
2779 | ||
2780 | ret = ops->sequence_number(config, buf, &seq); | |
2781 | if (ret < 0) | |
2782 | goto error; | |
2783 | return put_u64(seq, arg); | |
2784 | } | |
5594698f JD |
2785 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
2786 | { | |
2787 | uint64_t id; | |
2788 | ||
2789 | ret = ops->instance_id(config, buf, &id); | |
2790 | if (ret < 0) | |
2791 | goto error; | |
2792 | return put_u64(id, arg); | |
2793 | } | |
3b731ab1 JD |
2794 | default: |
2795 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2796 | cmd, arg); | |
ed8d02d6 | 2797 | } |
3b731ab1 JD |
2798 | |
2799 | error: | |
2800 | return -ENOSYS; | |
ed8d02d6 JD |
2801 | } |
2802 | ||
2803 | #ifdef CONFIG_COMPAT | |
2804 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2805 | unsigned int cmd, unsigned long arg) | |
2806 | { | |
3b731ab1 JD |
2807 | struct lib_ring_buffer *buf = filp->private_data; |
2808 | struct channel *chan = buf->backend.chan; | |
2809 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2810 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2811 | int ret; |
2812 | ||
2813 | if (atomic_read(&chan->record_disabled)) | |
2814 | return -EIO; | |
2815 | ||
ed8d02d6 | 2816 | switch (cmd) { |
3b731ab1 JD |
2817 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2818 | { | |
2819 | uint64_t ts; | |
2820 | ||
dd5a0db3 | 2821 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2822 | if (ret < 0) |
2823 | goto error; | |
2824 | return put_u64(ts, arg); | |
2825 | } | |
2826 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
2827 | { | |
2828 | uint64_t ts; | |
2829 | ||
dd5a0db3 | 2830 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2831 | if (ret < 0) |
2832 | goto error; | |
2833 | return put_u64(ts, arg); | |
2834 | } | |
2835 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
2836 | { | |
2837 | uint64_t ed; | |
2838 | ||
dd5a0db3 | 2839 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2840 | if (ret < 0) |
2841 | goto error; | |
2842 | return put_u64(ed, arg); | |
ed8d02d6 | 2843 | } |
3b731ab1 JD |
2844 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
2845 | { | |
2846 | uint64_t cs; | |
2847 | ||
dd5a0db3 | 2848 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2849 | if (ret < 0) |
2850 | goto error; | |
2851 | return put_u64(cs, arg); | |
2852 | } | |
2853 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
2854 | { | |
2855 | uint64_t ps; | |
2856 | ||
dd5a0db3 | 2857 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2858 | if (ret < 0) |
2859 | goto error; | |
2860 | return put_u64(ps, arg); | |
2861 | } | |
2862 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
2863 | { | |
2864 | uint64_t si; | |
2865 | ||
dd5a0db3 | 2866 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2867 | if (ret < 0) |
2868 | goto error; | |
2869 | return put_u64(si, arg); | |
2870 | } | |
2348ca17 JD |
2871 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2872 | { | |
2873 | uint64_t ts; | |
2874 | ||
dd5a0db3 | 2875 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2876 | if (ret < 0) |
2877 | goto error; | |
2878 | return put_u64(ts, arg); | |
2879 | } | |
5b3cf4f9 JD |
2880 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2881 | { | |
2882 | uint64_t seq; | |
2883 | ||
2884 | ret = ops->sequence_number(config, buf, &seq); | |
2885 | if (ret < 0) | |
2886 | goto error; | |
2887 | return put_u64(seq, arg); | |
2888 | } | |
5594698f JD |
2889 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2890 | { | |
2891 | uint64_t id; | |
2892 | ||
2893 | ret = ops->instance_id(config, buf, &id); | |
2894 | if (ret < 0) | |
2895 | goto error; | |
2896 | return put_u64(id, arg); | |
2897 | } | |
3b731ab1 JD |
2898 | default: |
2899 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2900 | cmd, arg); | |
2901 | } | |
2902 | ||
2903 | error: | |
2904 | return -ENOSYS; | |
ed8d02d6 JD |
2905 | } |
2906 | #endif /* CONFIG_COMPAT */ | |
2907 | ||
2908 | static void lttng_stream_override_ring_buffer_fops(void) | |
2909 | { | |
2910 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2911 | lttng_stream_ring_buffer_file_operations.open = | |
2912 | lib_ring_buffer_file_operations.open; | |
2913 | lttng_stream_ring_buffer_file_operations.release = | |
2914 | lib_ring_buffer_file_operations.release; | |
2915 | lttng_stream_ring_buffer_file_operations.poll = | |
2916 | lib_ring_buffer_file_operations.poll; | |
2917 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2918 | lib_ring_buffer_file_operations.splice_read; | |
2919 | lttng_stream_ring_buffer_file_operations.mmap = | |
2920 | lib_ring_buffer_file_operations.mmap; | |
2921 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2922 | lttng_stream_ring_buffer_ioctl; | |
2923 | lttng_stream_ring_buffer_file_operations.llseek = | |
2924 | lib_ring_buffer_file_operations.llseek; | |
2925 | #ifdef CONFIG_COMPAT | |
2926 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2927 | lttng_stream_ring_buffer_compat_ioctl; | |
2928 | #endif | |
2929 | } | |
2930 | ||
80996790 | 2931 | int __init lttng_abi_init(void) |
baf20995 MD |
2932 | { |
2933 | int ret = 0; | |
2934 | ||
263b6c88 | 2935 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2936 | lttng_clock_ref(); |
f771eda6 JD |
2937 | |
2938 | ret = lttng_tp_mempool_init(); | |
2939 | if (ret) { | |
2940 | goto error; | |
2941 | } | |
2942 | ||
d29348f7 | 2943 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2944 | <tng_proc_ops, NULL); |
2470a237 | 2945 | |
255e52a4 | 2946 | if (!lttng_proc_dentry) { |
5a15f70c | 2947 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
2948 | ret = -ENOMEM; |
2949 | goto error; | |
2950 | } | |
ed8d02d6 | 2951 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2952 | return 0; |
ed8d02d6 | 2953 | |
baf20995 | 2954 | error: |
f771eda6 | 2955 | lttng_tp_mempool_destroy(); |
2754583e | 2956 | lttng_clock_unref(); |
baf20995 MD |
2957 | return ret; |
2958 | } | |
2959 | ||
e6e65fcd MD |
2960 | /* No __exit annotation because used by init error path too. */ |
2961 | void lttng_abi_exit(void) | |
baf20995 | 2962 | { |
f771eda6 | 2963 | lttng_tp_mempool_destroy(); |
2754583e | 2964 | lttng_clock_unref(); |
e6a17f26 MD |
2965 | if (lttng_proc_dentry) |
2966 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2967 | } |