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> | |
45 | #include <lttng/tracer.h> | |
46 | #include <lttng/tp-mempool.h> | |
24591303 | 47 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 48 | #include <ringbuffer/iterator.h> |
baf20995 MD |
49 | |
50 | /* | |
51 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 52 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
53 | */ |
54 | ||
e6a17f26 | 55 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
56 | |
57 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
58 | static const struct proc_ops lttng_proc_ops; | |
59 | #else | |
60 | static const struct file_operations lttng_proc_ops; | |
61 | #endif | |
62 | ||
ad1c05e1 | 63 | static const struct file_operations lttng_session_fops; |
750b05f2 | 64 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 65 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 66 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 67 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 68 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 69 | |
9616f0bf | 70 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 71 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 72 | |
99f52fcc FD |
73 | static int validate_zeroed_padding(char *p, size_t len) |
74 | { | |
75 | size_t i; | |
76 | ||
77 | for (i = 0; i < len; i++) { | |
78 | if (p[i]) | |
79 | return -1; | |
80 | } | |
81 | return 0; | |
82 | } | |
83 | ||
a33c9927 MD |
84 | /* |
85 | * Teardown management: opened file descriptors keep a refcount on the module, | |
86 | * so it can only exit when all file descriptors are closed. | |
87 | */ | |
88 | ||
ad1c05e1 | 89 | static |
baf20995 MD |
90 | int lttng_abi_create_session(void) |
91 | { | |
a90917c3 | 92 | struct lttng_session *session; |
c0e31d2e | 93 | struct file *session_file; |
11b5a3c2 | 94 | int session_fd, ret; |
baf20995 | 95 | |
a90917c3 | 96 | session = lttng_session_create(); |
baf20995 MD |
97 | if (!session) |
98 | return -ENOMEM; | |
4ac10b76 | 99 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
100 | if (session_fd < 0) { |
101 | ret = session_fd; | |
102 | goto fd_error; | |
103 | } | |
c0e31d2e | 104 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 105 | <tng_session_fops, |
baf20995 | 106 | session, O_RDWR); |
c0e31d2e MD |
107 | if (IS_ERR(session_file)) { |
108 | ret = PTR_ERR(session_file); | |
baf20995 MD |
109 | goto file_error; |
110 | } | |
c0e31d2e MD |
111 | session->file = session_file; |
112 | fd_install(session_fd, session_file); | |
baf20995 MD |
113 | return session_fd; |
114 | ||
115 | file_error: | |
116 | put_unused_fd(session_fd); | |
117 | fd_error: | |
a90917c3 | 118 | lttng_session_destroy(session); |
baf20995 MD |
119 | return ret; |
120 | } | |
121 | ||
21f58fb7 FD |
122 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
123 | { | |
124 | struct lttng_event_notifier_group *event_notifier_group = | |
125 | container_of(entry, struct lttng_event_notifier_group, | |
126 | wakeup_pending); | |
127 | wake_up_interruptible(&event_notifier_group->read_wait); | |
128 | } | |
129 | ||
750b05f2 FD |
130 | static |
131 | int lttng_abi_create_event_notifier_group(void) | |
132 | { | |
133 | struct lttng_event_notifier_group *event_notifier_group; | |
134 | struct file *event_notifier_group_file; | |
135 | int event_notifier_group_fd, ret; | |
136 | ||
137 | event_notifier_group = lttng_event_notifier_group_create(); | |
138 | if (!event_notifier_group) | |
139 | return -ENOMEM; | |
140 | ||
141 | event_notifier_group_fd = lttng_get_unused_fd(); | |
142 | if (event_notifier_group_fd < 0) { | |
143 | ret = event_notifier_group_fd; | |
144 | goto fd_error; | |
145 | } | |
146 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
147 | <tng_event_notifier_group_fops, | |
148 | event_notifier_group, O_RDWR); | |
149 | if (IS_ERR(event_notifier_group_file)) { | |
150 | ret = PTR_ERR(event_notifier_group_file); | |
151 | goto file_error; | |
152 | } | |
153 | ||
154 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
155 | init_waitqueue_head(&event_notifier_group->read_wait); |
156 | init_irq_work(&event_notifier_group->wakeup_pending, | |
157 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
158 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
159 | return event_notifier_group_fd; | |
160 | ||
161 | file_error: | |
162 | put_unused_fd(event_notifier_group_fd); | |
163 | fd_error: | |
164 | lttng_event_notifier_group_destroy(event_notifier_group); | |
165 | return ret; | |
166 | } | |
167 | ||
271b6681 MD |
168 | static |
169 | int lttng_abi_tracepoint_list(void) | |
170 | { | |
171 | struct file *tracepoint_list_file; | |
172 | int file_fd, ret; | |
173 | ||
4ac10b76 | 174 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
175 | if (file_fd < 0) { |
176 | ret = file_fd; | |
177 | goto fd_error; | |
178 | } | |
30f18bf0 | 179 | |
8ee099b6 | 180 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
181 | <tng_tracepoint_list_fops, |
182 | NULL, O_RDWR); | |
183 | if (IS_ERR(tracepoint_list_file)) { | |
184 | ret = PTR_ERR(tracepoint_list_file); | |
185 | goto file_error; | |
186 | } | |
30f18bf0 MD |
187 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
188 | if (ret < 0) | |
189 | goto open_error; | |
271b6681 MD |
190 | fd_install(file_fd, tracepoint_list_file); |
191 | return file_fd; | |
192 | ||
30f18bf0 MD |
193 | open_error: |
194 | fput(tracepoint_list_file); | |
271b6681 MD |
195 | file_error: |
196 | put_unused_fd(file_fd); | |
197 | fd_error: | |
198 | return ret; | |
199 | } | |
200 | ||
f127e61e MD |
201 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
202 | static inline | |
203 | int lttng_abi_syscall_list(void) | |
204 | { | |
205 | return -ENOSYS; | |
206 | } | |
207 | #else | |
208 | static | |
209 | int lttng_abi_syscall_list(void) | |
210 | { | |
211 | struct file *syscall_list_file; | |
212 | int file_fd, ret; | |
213 | ||
214 | file_fd = lttng_get_unused_fd(); | |
215 | if (file_fd < 0) { | |
216 | ret = file_fd; | |
217 | goto fd_error; | |
218 | } | |
219 | ||
220 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
221 | <tng_syscall_list_fops, | |
222 | NULL, O_RDWR); | |
223 | if (IS_ERR(syscall_list_file)) { | |
224 | ret = PTR_ERR(syscall_list_file); | |
225 | goto file_error; | |
226 | } | |
227 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
228 | if (ret < 0) | |
229 | goto open_error; | |
230 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
231 | return file_fd; |
232 | ||
233 | open_error: | |
234 | fput(syscall_list_file); | |
235 | file_error: | |
236 | put_unused_fd(file_fd); | |
237 | fd_error: | |
238 | return ret; | |
239 | } | |
240 | #endif | |
241 | ||
80c16bcf | 242 | static |
6dccd6c1 | 243 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 244 | { |
6dccd6c1 JD |
245 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
246 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
247 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
248 | } |
249 | ||
42cabb80 MD |
250 | static |
251 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
252 | { | |
253 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
254 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
255 | } | |
256 | ||
8070f5c0 MD |
257 | static |
258 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 259 | struct lttng_kernel_context *context_param, |
a90917c3 | 260 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 261 | { |
8070f5c0 MD |
262 | |
263 | if (session->been_active) | |
264 | return -EPERM; | |
265 | ||
6dccd6c1 | 266 | switch (context_param->ctx) { |
12a313a5 | 267 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 268 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
269 | case LTTNG_KERNEL_CONTEXT_PRIO: |
270 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
271 | case LTTNG_KERNEL_CONTEXT_NICE: |
272 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
273 | case LTTNG_KERNEL_CONTEXT_VPID: |
274 | return lttng_add_vpid_to_ctx(ctx); | |
275 | case LTTNG_KERNEL_CONTEXT_TID: | |
276 | return lttng_add_tid_to_ctx(ctx); | |
277 | case LTTNG_KERNEL_CONTEXT_VTID: | |
278 | return lttng_add_vtid_to_ctx(ctx); | |
279 | case LTTNG_KERNEL_CONTEXT_PPID: | |
280 | return lttng_add_ppid_to_ctx(ctx); | |
281 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
282 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 283 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
284 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
285 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
286 | context_param->u.perf_counter.config, | |
287 | context_param->u.perf_counter.name, | |
c24a0d71 | 288 | ctx); |
a2563e83 MD |
289 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
290 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
291 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
292 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
293 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
294 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
295 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
296 | return lttng_add_interruptible_to_ctx(ctx); | |
297 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
298 | return lttng_add_need_reschedule_to_ctx(ctx); | |
299 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
300 | return lttng_add_preemptible_to_ctx(ctx); | |
301 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
302 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
303 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
304 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
305 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
306 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
307 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
308 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
309 | return lttng_add_ipc_ns_to_ctx(ctx); | |
310 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
311 | return lttng_add_mnt_ns_to_ctx(ctx); | |
312 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
313 | return lttng_add_net_ns_to_ctx(ctx); | |
314 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
315 | return lttng_add_pid_ns_to_ctx(ctx); | |
316 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
317 | return lttng_add_user_ns_to_ctx(ctx); | |
318 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
319 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
320 | case LTTNG_KERNEL_CONTEXT_UID: |
321 | return lttng_add_uid_to_ctx(ctx); | |
322 | case LTTNG_KERNEL_CONTEXT_EUID: | |
323 | return lttng_add_euid_to_ctx(ctx); | |
324 | case LTTNG_KERNEL_CONTEXT_SUID: | |
325 | return lttng_add_suid_to_ctx(ctx); | |
326 | case LTTNG_KERNEL_CONTEXT_GID: | |
327 | return lttng_add_gid_to_ctx(ctx); | |
328 | case LTTNG_KERNEL_CONTEXT_EGID: | |
329 | return lttng_add_egid_to_ctx(ctx); | |
330 | case LTTNG_KERNEL_CONTEXT_SGID: | |
331 | return lttng_add_sgid_to_ctx(ctx); | |
332 | case LTTNG_KERNEL_CONTEXT_VUID: | |
333 | return lttng_add_vuid_to_ctx(ctx); | |
334 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
335 | return lttng_add_veuid_to_ctx(ctx); | |
336 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
337 | return lttng_add_vsuid_to_ctx(ctx); | |
338 | case LTTNG_KERNEL_CONTEXT_VGID: | |
339 | return lttng_add_vgid_to_ctx(ctx); | |
340 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
341 | return lttng_add_vegid_to_ctx(ctx); | |
342 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
343 | return lttng_add_vsgid_to_ctx(ctx); | |
876e2e92 MJ |
344 | case LTTNG_KERNEL_CONTEXT_TIME_NS: |
345 | return lttng_add_time_ns_to_ctx(ctx); | |
8070f5c0 MD |
346 | default: |
347 | return -EINVAL; | |
348 | } | |
349 | } | |
350 | ||
ad1c05e1 MD |
351 | /** |
352 | * lttng_ioctl - lttng syscall through ioctl | |
353 | * | |
c0e31d2e | 354 | * @file: the file |
ad1c05e1 MD |
355 | * @cmd: the command |
356 | * @arg: command arg | |
357 | * | |
358 | * This ioctl implements lttng commands: | |
38d024ae | 359 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 360 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
361 | * LTTNG_KERNEL_TRACER_VERSION |
362 | * Returns the LTTng kernel tracer version | |
363 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
364 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
365 | * LTTNG_KERNEL_WAIT_QUIESCENT |
366 | * Returns after all previously running probes have completed | |
42cabb80 MD |
367 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
368 | * Returns the LTTng kernel tracer ABI version | |
750b05f2 FD |
369 | * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE |
370 | * Returns a LTTng event notifier group file descriptor | |
ad1c05e1 MD |
371 | * |
372 | * The returned session will be deleted when its file descriptor is closed. | |
373 | */ | |
374 | static | |
c0e31d2e | 375 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
376 | { |
377 | switch (cmd) { | |
6dccd6c1 | 378 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 379 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 380 | return lttng_abi_create_session(); |
750b05f2 FD |
381 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE: |
382 | return lttng_abi_create_event_notifier_group(); | |
6dccd6c1 JD |
383 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
384 | { | |
385 | struct lttng_kernel_tracer_version v; | |
386 | struct lttng_kernel_old_tracer_version oldv; | |
387 | struct lttng_kernel_old_tracer_version *uversion = | |
388 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
389 | ||
390 | lttng_abi_tracer_version(&v); | |
391 | oldv.major = v.major; | |
392 | oldv.minor = v.minor; | |
393 | oldv.patchlevel = v.patchlevel; | |
394 | ||
395 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
396 | return -EFAULT; | |
397 | return 0; | |
398 | } | |
80c16bcf | 399 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
400 | { |
401 | struct lttng_kernel_tracer_version version; | |
402 | struct lttng_kernel_tracer_version *uversion = | |
403 | (struct lttng_kernel_tracer_version __user *) arg; | |
404 | ||
405 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
406 | |
407 | if (copy_to_user(uversion, &version, sizeof(version))) | |
408 | return -EFAULT; | |
409 | return 0; | |
410 | } | |
411 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
412 | { | |
413 | struct lttng_kernel_tracer_abi_version version; | |
414 | struct lttng_kernel_tracer_abi_version *uversion = | |
415 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
416 | ||
417 | lttng_abi_tracer_abi_version(&version); | |
418 | ||
6dccd6c1 JD |
419 | if (copy_to_user(uversion, &version, sizeof(version))) |
420 | return -EFAULT; | |
421 | return 0; | |
422 | } | |
423 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
424 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
425 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
426 | case LTTNG_KERNEL_SYSCALL_LIST: |
427 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 428 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
429 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
430 | synchronize_trace(); | |
431 | return 0; | |
6dccd6c1 JD |
432 | case LTTNG_KERNEL_OLD_CALIBRATE: |
433 | { | |
434 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
435 | (struct lttng_kernel_old_calibrate __user *) arg; | |
436 | struct lttng_kernel_old_calibrate old_calibrate; | |
437 | struct lttng_kernel_calibrate calibrate; | |
438 | int ret; | |
439 | ||
440 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
441 | return -EFAULT; | |
442 | calibrate.type = old_calibrate.type; | |
443 | ret = lttng_calibrate(&calibrate); | |
444 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
445 | return -EFAULT; | |
446 | return ret; | |
447 | } | |
57105fc2 MD |
448 | case LTTNG_KERNEL_CALIBRATE: |
449 | { | |
3db41b2c MD |
450 | struct lttng_kernel_calibrate __user *ucalibrate = |
451 | (struct lttng_kernel_calibrate __user *) arg; | |
452 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
453 | int ret; |
454 | ||
455 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
456 | return -EFAULT; | |
457 | ret = lttng_calibrate(&calibrate); | |
458 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
459 | return -EFAULT; | |
460 | return ret; | |
461 | } | |
ad1c05e1 MD |
462 | default: |
463 | return -ENOIOCTLCMD; | |
464 | } | |
465 | } | |
466 | ||
059de147 MJ |
467 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
468 | static const struct proc_ops lttng_proc_ops = { | |
469 | .proc_ioctl = lttng_ioctl, | |
470 | #ifdef CONFIG_COMPAT | |
471 | .proc_compat_ioctl = lttng_ioctl, | |
472 | #endif /* CONFIG_COMPAT */ | |
473 | }; | |
474 | #else | |
475 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 476 | .owner = THIS_MODULE, |
ad1c05e1 MD |
477 | .unlocked_ioctl = lttng_ioctl, |
478 | #ifdef CONFIG_COMPAT | |
03037b98 | 479 | .compat_ioctl = lttng_ioctl, |
059de147 | 480 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 481 | }; |
059de147 | 482 | #endif |
ad1c05e1 | 483 | |
5dbbdb43 | 484 | static |
c0e31d2e | 485 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 486 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 487 | enum channel_type channel_type) |
baf20995 | 488 | { |
a90917c3 | 489 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 490 | const struct file_operations *fops = NULL; |
5dbbdb43 | 491 | const char *transport_name; |
a90917c3 | 492 | struct lttng_channel *chan; |
c0e31d2e | 493 | struct file *chan_file; |
baf20995 | 494 | int chan_fd; |
ad1c05e1 | 495 | int ret = 0; |
baf20995 | 496 | |
4ac10b76 | 497 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
498 | if (chan_fd < 0) { |
499 | ret = chan_fd; | |
500 | goto fd_error; | |
501 | } | |
88dfd899 MD |
502 | switch (channel_type) { |
503 | case PER_CPU_CHANNEL: | |
504 | fops = <tng_channel_fops; | |
505 | break; | |
506 | case METADATA_CHANNEL: | |
507 | fops = <tng_metadata_fops; | |
508 | break; | |
509 | } | |
2470a237 | 510 | |
c0e31d2e | 511 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 512 | fops, |
03037b98 | 513 | NULL, O_RDWR); |
c0e31d2e MD |
514 | if (IS_ERR(chan_file)) { |
515 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
516 | goto file_error; |
517 | } | |
5dbbdb43 MD |
518 | switch (channel_type) { |
519 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
520 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
521 | transport_name = chan_param->overwrite ? | |
96ba7208 | 522 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
523 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
524 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
525 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
526 | } else { | |
527 | return -EINVAL; | |
528 | } | |
5dbbdb43 | 529 | break; |
5dbbdb43 | 530 | case METADATA_CHANNEL: |
6dccd6c1 | 531 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 532 | transport_name = "relay-metadata"; |
6dccd6c1 | 533 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
534 | transport_name = "relay-metadata-mmap"; |
535 | else | |
536 | return -EINVAL; | |
5dbbdb43 MD |
537 | break; |
538 | default: | |
539 | transport_name = "<unknown>"; | |
540 | break; | |
541 | } | |
98d7281c MJ |
542 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
543 | ret = -EOVERFLOW; | |
9c1f4643 MD |
544 | goto refcount_error; |
545 | } | |
03037b98 MD |
546 | /* |
547 | * We tolerate no failure path after channel creation. It will stay | |
548 | * invariant for the rest of the session. | |
549 | */ | |
a90917c3 | 550 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
551 | chan_param->subbuf_size, |
552 | chan_param->num_subbuf, | |
553 | chan_param->switch_timer_interval, | |
d83004aa JD |
554 | chan_param->read_timer_interval, |
555 | channel_type); | |
03037b98 | 556 | if (!chan) { |
f3d01b96 | 557 | ret = -EINVAL; |
03037b98 MD |
558 | goto chan_error; |
559 | } | |
11b5a3c2 | 560 | chan->file = chan_file; |
c0e31d2e MD |
561 | chan_file->private_data = chan; |
562 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 563 | |
baf20995 MD |
564 | return chan_fd; |
565 | ||
03037b98 | 566 | chan_error: |
9c1f4643 MD |
567 | atomic_long_dec(&session_file->f_count); |
568 | refcount_error: | |
c0e31d2e | 569 | fput(chan_file); |
baf20995 MD |
570 | file_error: |
571 | put_unused_fd(chan_fd); | |
572 | fd_error: | |
baf20995 MD |
573 | return ret; |
574 | } | |
575 | ||
7f859fbf JR |
576 | static |
577 | int lttng_abi_session_set_name(struct lttng_session *session, | |
578 | struct lttng_kernel_session_name *name) | |
579 | { | |
580 | size_t len; | |
581 | ||
582 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
583 | ||
584 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
585 | /* Name is too long/malformed */ | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
589 | strcpy(session->name, name->name); | |
590 | return 0; | |
591 | } | |
592 | ||
1c88f269 JR |
593 | static |
594 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
595 | struct lttng_kernel_session_creation_time *time) | |
596 | { | |
597 | size_t len; | |
598 | ||
599 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
600 | ||
601 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
602 | /* Time is too long/malformed */ | |
603 | return -EINVAL; | |
604 | } | |
605 | ||
606 | strcpy(session->creation_time, time->iso8601); | |
607 | return 0; | |
608 | } | |
609 | ||
99f52fcc FD |
610 | static |
611 | int lttng_counter_release(struct inode *inode, struct file *file) | |
612 | { | |
613 | struct lttng_counter *counter = file->private_data; | |
614 | ||
615 | if (counter) { | |
616 | /* | |
617 | * Do not destroy the counter itself. Wait of the owner | |
618 | * (event_notifier group) to be destroyed. | |
619 | */ | |
620 | fput(counter->owner); | |
621 | } | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
626 | static | |
627 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
628 | { | |
629 | struct lttng_counter *counter = file->private_data; | |
630 | size_t indexes[LTTNG_KERNEL_COUNTER_DIMENSION_MAX] = { 0 }; | |
631 | int i; | |
632 | ||
633 | switch (cmd) { | |
634 | case LTTNG_KERNEL_COUNTER_READ: | |
635 | { | |
636 | struct lttng_kernel_counter_read local_counter_read; | |
637 | struct lttng_kernel_counter_read __user *ucounter_read = | |
638 | (struct lttng_kernel_counter_read __user *) arg; | |
639 | bool overflow, underflow; | |
640 | int64_t value; | |
641 | int32_t cpu; | |
642 | int ret; | |
643 | ||
644 | if (copy_from_user(&local_counter_read, ucounter_read, | |
645 | sizeof(local_counter_read))) | |
646 | return -EFAULT; | |
647 | if (validate_zeroed_padding(local_counter_read.padding, | |
648 | sizeof(local_counter_read.padding))) | |
649 | return -EINVAL; | |
650 | ||
651 | /* Cast all indexes into size_t. */ | |
652 | for (i = 0; i < local_counter_read.index.number_dimensions; i++) | |
653 | indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i]; | |
654 | cpu = local_counter_read.cpu; | |
655 | ||
656 | ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, | |
657 | &overflow, &underflow); | |
658 | if (ret) | |
659 | return ret; | |
660 | local_counter_read.value.value = value; | |
661 | local_counter_read.value.overflow = overflow; | |
662 | local_counter_read.value.underflow = underflow; | |
663 | ||
664 | if (copy_to_user(&ucounter_read->value, &local_counter_read.value, | |
665 | sizeof(local_counter_read.value))) | |
666 | return -EFAULT; | |
667 | ||
668 | return 0; | |
669 | } | |
670 | case LTTNG_KERNEL_COUNTER_AGGREGATE: | |
671 | { | |
672 | struct lttng_kernel_counter_aggregate local_counter_aggregate; | |
673 | struct lttng_kernel_counter_aggregate __user *ucounter_aggregate = | |
674 | (struct lttng_kernel_counter_aggregate __user *) arg; | |
675 | bool overflow, underflow; | |
676 | int64_t value; | |
677 | int ret; | |
678 | ||
679 | if (copy_from_user(&local_counter_aggregate, ucounter_aggregate, | |
680 | sizeof(local_counter_aggregate))) | |
681 | return -EFAULT; | |
682 | if (validate_zeroed_padding(local_counter_aggregate.padding, | |
683 | sizeof(local_counter_aggregate.padding))) | |
684 | return -EINVAL; | |
685 | ||
686 | /* Cast all indexes into size_t. */ | |
687 | for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++) | |
688 | indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i]; | |
689 | ||
690 | ret = lttng_kernel_counter_aggregate(counter, indexes, &value, | |
691 | &overflow, &underflow); | |
692 | if (ret) | |
693 | return ret; | |
694 | local_counter_aggregate.value.value = value; | |
695 | local_counter_aggregate.value.overflow = overflow; | |
696 | local_counter_aggregate.value.underflow = underflow; | |
697 | ||
698 | if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value, | |
699 | sizeof(local_counter_aggregate.value))) | |
700 | return -EFAULT; | |
701 | ||
702 | return 0; | |
703 | } | |
704 | case LTTNG_KERNEL_COUNTER_CLEAR: | |
705 | { | |
706 | struct lttng_kernel_counter_clear local_counter_clear; | |
707 | struct lttng_kernel_counter_clear __user *ucounter_clear = | |
708 | (struct lttng_kernel_counter_clear __user *) arg; | |
709 | ||
710 | if (copy_from_user(&local_counter_clear, ucounter_clear, | |
711 | sizeof(local_counter_clear))) | |
712 | return -EFAULT; | |
713 | if (validate_zeroed_padding(local_counter_clear.padding, | |
714 | sizeof(local_counter_clear.padding))) | |
715 | return -EINVAL; | |
716 | ||
717 | /* Cast all indexes into size_t. */ | |
718 | for (i = 0; i < local_counter_clear.index.number_dimensions; i++) | |
719 | indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i]; | |
720 | ||
721 | return lttng_kernel_counter_clear(counter, indexes); | |
722 | } | |
723 | default: | |
724 | WARN_ON_ONCE(1); | |
725 | return -ENOSYS; | |
726 | } | |
727 | } | |
728 | ||
729 | static const struct file_operations lttng_counter_fops = { | |
730 | .owner = THIS_MODULE, | |
731 | .release = lttng_counter_release, | |
732 | .unlocked_ioctl = lttng_counter_ioctl, | |
733 | #ifdef CONFIG_COMPAT | |
734 | .compat_ioctl = lttng_counter_ioctl, | |
735 | #endif | |
736 | }; | |
737 | ||
738 | ||
d1f652f8 MD |
739 | static |
740 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
741 | { | |
742 | switch (tracker->type) { | |
743 | case LTTNG_KERNEL_TRACKER_PID: | |
744 | return TRACKER_PID; | |
745 | case LTTNG_KERNEL_TRACKER_VPID: | |
746 | return TRACKER_VPID; | |
747 | case LTTNG_KERNEL_TRACKER_UID: | |
748 | return TRACKER_UID; | |
749 | case LTTNG_KERNEL_TRACKER_VUID: | |
750 | return TRACKER_VUID; | |
751 | case LTTNG_KERNEL_TRACKER_GID: | |
752 | return TRACKER_GID; | |
753 | case LTTNG_KERNEL_TRACKER_VGID: | |
754 | return TRACKER_VGID; | |
755 | default: | |
756 | return TRACKER_UNKNOWN; | |
757 | } | |
758 | } | |
759 | ||
baf20995 | 760 | /** |
ad1c05e1 | 761 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 762 | * |
c0e31d2e | 763 | * @file: the file |
baf20995 MD |
764 | * @cmd: the command |
765 | * @arg: command arg | |
766 | * | |
767 | * This ioctl implements lttng commands: | |
38d024ae | 768 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 769 | * Returns a LTTng channel file descriptor |
e64957da MD |
770 | * LTTNG_KERNEL_ENABLE |
771 | * Enables tracing for a session (weak enable) | |
772 | * LTTNG_KERNEL_DISABLE | |
773 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
774 | * LTTNG_KERNEL_METADATA |
775 | * Returns a LTTng metadata file descriptor | |
e0130fab | 776 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 777 | * Add PID to session PID tracker |
e0130fab | 778 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
779 | * Remove PID from session PID tracker |
780 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
781 | * Add ID to tracker | |
782 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
783 | * Remove ID from tracker | |
ad1c05e1 MD |
784 | * |
785 | * The returned channel will be deleted when its file descriptor is closed. | |
786 | */ | |
787 | static | |
c0e31d2e | 788 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 789 | { |
a90917c3 | 790 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
791 | struct lttng_kernel_channel chan_param; |
792 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 793 | |
ad1c05e1 | 794 | switch (cmd) { |
6dccd6c1 JD |
795 | case LTTNG_KERNEL_OLD_CHANNEL: |
796 | { | |
6dccd6c1 JD |
797 | if (copy_from_user(&old_chan_param, |
798 | (struct lttng_kernel_old_channel __user *) arg, | |
799 | sizeof(struct lttng_kernel_old_channel))) | |
800 | return -EFAULT; | |
801 | chan_param.overwrite = old_chan_param.overwrite; | |
802 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
803 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
804 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
805 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
806 | chan_param.output = old_chan_param.output; | |
807 | ||
808 | return lttng_abi_create_channel(file, &chan_param, | |
809 | PER_CPU_CHANNEL); | |
810 | } | |
38d024ae | 811 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 812 | { |
6dccd6c1 | 813 | if (copy_from_user(&chan_param, |
38d024ae | 814 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
815 | sizeof(struct lttng_kernel_channel))) |
816 | return -EFAULT; | |
817 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 818 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
819 | } |
820 | case LTTNG_KERNEL_OLD_SESSION_START: | |
821 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 822 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 823 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 824 | return lttng_session_enable(session); |
6dccd6c1 JD |
825 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
826 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 827 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 828 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 829 | return lttng_session_disable(session); |
6dccd6c1 JD |
830 | case LTTNG_KERNEL_OLD_METADATA: |
831 | { | |
6dccd6c1 JD |
832 | if (copy_from_user(&old_chan_param, |
833 | (struct lttng_kernel_old_channel __user *) arg, | |
834 | sizeof(struct lttng_kernel_old_channel))) | |
835 | return -EFAULT; | |
836 | chan_param.overwrite = old_chan_param.overwrite; | |
837 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
838 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
839 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
840 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
841 | chan_param.output = old_chan_param.output; | |
842 | ||
843 | return lttng_abi_create_channel(file, &chan_param, | |
844 | METADATA_CHANNEL); | |
845 | } | |
38d024ae | 846 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 847 | { |
6dccd6c1 JD |
848 | if (copy_from_user(&chan_param, |
849 | (struct lttng_kernel_channel __user *) arg, | |
850 | sizeof(struct lttng_kernel_channel))) | |
851 | return -EFAULT; | |
852 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 853 | METADATA_CHANNEL); |
6dccd6c1 | 854 | } |
e0130fab | 855 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 856 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 857 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
858 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
859 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
860 | { | |
861 | struct lttng_kernel_tracker_args tracker; | |
862 | enum tracker_type tracker_type; | |
863 | ||
864 | if (copy_from_user(&tracker, | |
865 | (struct lttng_kernel_tracker_args __user *) arg, | |
866 | sizeof(struct lttng_kernel_tracker_args))) | |
867 | return -EFAULT; | |
868 | tracker_type = get_tracker_type(&tracker); | |
869 | if (tracker_type == TRACKER_UNKNOWN) | |
870 | return -EINVAL; | |
871 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
872 | } | |
873 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
874 | { | |
875 | struct lttng_kernel_tracker_args tracker; | |
876 | enum tracker_type tracker_type; | |
877 | ||
878 | if (copy_from_user(&tracker, | |
879 | (struct lttng_kernel_tracker_args __user *) arg, | |
880 | sizeof(struct lttng_kernel_tracker_args))) | |
881 | return -EFAULT; | |
882 | tracker_type = get_tracker_type(&tracker); | |
883 | if (tracker_type == TRACKER_UNKNOWN) | |
884 | return -EINVAL; | |
885 | return lttng_session_untrack_id(session, tracker_type, | |
886 | tracker.id); | |
887 | } | |
7e6f9ef6 | 888 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
889 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
890 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
891 | { | |
892 | struct lttng_kernel_tracker_args tracker; | |
893 | enum tracker_type tracker_type; | |
894 | ||
895 | if (copy_from_user(&tracker, | |
896 | (struct lttng_kernel_tracker_args __user *) arg, | |
897 | sizeof(struct lttng_kernel_tracker_args))) | |
898 | return -EFAULT; | |
899 | tracker_type = get_tracker_type(&tracker); | |
900 | if (tracker_type == TRACKER_UNKNOWN) | |
901 | return -EINVAL; | |
902 | return lttng_session_list_tracker_ids(session, tracker_type); | |
903 | } | |
9616f0bf JD |
904 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
905 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
906 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
907 | return lttng_session_statedump(session); | |
7f859fbf JR |
908 | case LTTNG_KERNEL_SESSION_SET_NAME: |
909 | { | |
910 | struct lttng_kernel_session_name name; | |
911 | ||
912 | if (copy_from_user(&name, | |
913 | (struct lttng_kernel_session_name __user *) arg, | |
914 | sizeof(struct lttng_kernel_session_name))) | |
915 | return -EFAULT; | |
916 | return lttng_abi_session_set_name(session, &name); | |
917 | } | |
1c88f269 JR |
918 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
919 | { | |
920 | struct lttng_kernel_session_creation_time time; | |
921 | ||
922 | if (copy_from_user(&time, | |
923 | (struct lttng_kernel_session_creation_time __user *) arg, | |
924 | sizeof(struct lttng_kernel_session_creation_time))) | |
925 | return -EFAULT; | |
926 | return lttng_abi_session_set_creation_time(session, &time); | |
927 | } | |
ad1c05e1 MD |
928 | default: |
929 | return -ENOIOCTLCMD; | |
930 | } | |
931 | } | |
932 | ||
03037b98 MD |
933 | /* |
934 | * Called when the last file reference is dropped. | |
935 | * | |
936 | * Big fat note: channels and events are invariant for the whole session after | |
937 | * their creation. So this session destruction also destroys all channel and | |
938 | * event structures specific to this session (they are not destroyed when their | |
939 | * individual file is released). | |
940 | */ | |
ad1c05e1 | 941 | static |
03037b98 | 942 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 943 | { |
a90917c3 | 944 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
945 | |
946 | if (session) | |
a90917c3 | 947 | lttng_session_destroy(session); |
11b5a3c2 | 948 | return 0; |
ad1c05e1 | 949 | } |
ad1c05e1 MD |
950 | |
951 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 952 | .owner = THIS_MODULE, |
03037b98 | 953 | .release = lttng_session_release, |
ad1c05e1 MD |
954 | .unlocked_ioctl = lttng_session_ioctl, |
955 | #ifdef CONFIG_COMPAT | |
03037b98 | 956 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 957 | #endif |
11b5a3c2 | 958 | }; |
ad1c05e1 | 959 | |
db2511b4 MD |
960 | /* |
961 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
962 | * and retry (if new data available to read after flush). | |
963 | */ | |
964 | static | |
965 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
966 | size_t count, loff_t *ppos) | |
967 | { | |
968 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
969 | struct channel *chan = event_notifier_group->chan; | |
970 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
971 | ssize_t read_count = 0, len; | |
972 | size_t read_offset; | |
973 | ||
974 | might_sleep(); | |
975 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
976 | return -EFAULT; | |
977 | ||
978 | /* Finish copy of previous record */ | |
979 | if (*ppos != 0) { | |
980 | if (read_count < count) { | |
981 | len = chan->iter.len_left; | |
982 | read_offset = *ppos; | |
983 | goto skip_get_next; | |
984 | } | |
985 | } | |
986 | ||
987 | while (read_count < count) { | |
988 | size_t copy_len, space_left; | |
989 | ||
990 | len = lib_ring_buffer_get_next_record(chan, buf); | |
991 | len_test: | |
992 | if (len < 0) { | |
993 | /* | |
994 | * Check if buffer is finalized (end of file). | |
995 | */ | |
996 | if (len == -ENODATA) { | |
997 | /* A 0 read_count will tell about end of file */ | |
998 | goto nodata; | |
999 | } | |
1000 | if (filp->f_flags & O_NONBLOCK) { | |
1001 | if (!read_count) | |
1002 | read_count = -EAGAIN; | |
1003 | goto nodata; | |
1004 | } else { | |
1005 | int error; | |
1006 | ||
1007 | /* | |
1008 | * No data available at the moment, return what | |
1009 | * we got. | |
1010 | */ | |
1011 | if (read_count) | |
1012 | goto nodata; | |
1013 | ||
1014 | /* | |
1015 | * Wait for returned len to be >= 0 or -ENODATA. | |
1016 | */ | |
1017 | error = wait_event_interruptible( | |
1018 | event_notifier_group->read_wait, | |
1019 | ((len = lib_ring_buffer_get_next_record( | |
1020 | chan, buf)), len != -EAGAIN)); | |
1021 | CHAN_WARN_ON(chan, len == -EBUSY); | |
1022 | if (error) { | |
1023 | read_count = error; | |
1024 | goto nodata; | |
1025 | } | |
1026 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
1027 | goto len_test; | |
1028 | } | |
1029 | } | |
1030 | read_offset = buf->iter.read_offset; | |
1031 | skip_get_next: | |
1032 | space_left = count - read_count; | |
1033 | if (len <= space_left) { | |
1034 | copy_len = len; | |
1035 | chan->iter.len_left = 0; | |
1036 | *ppos = 0; | |
1037 | } else { | |
1038 | copy_len = space_left; | |
1039 | chan->iter.len_left = len - copy_len; | |
1040 | *ppos = read_offset + copy_len; | |
1041 | } | |
1042 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
1043 | &user_buf[read_count], | |
1044 | copy_len)) { | |
1045 | /* | |
1046 | * Leave the len_left and ppos values at their current | |
1047 | * state, as we currently have a valid event to read. | |
1048 | */ | |
1049 | return -EFAULT; | |
1050 | } | |
1051 | read_count += copy_len; | |
1052 | } | |
31c02fb7 | 1053 | goto put_record; |
db2511b4 MD |
1054 | |
1055 | nodata: | |
1056 | *ppos = 0; | |
1057 | chan->iter.len_left = 0; | |
31c02fb7 MD |
1058 | |
1059 | put_record: | |
1060 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1061 | return read_count; |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1066 | * there is data available. Perform a ring buffer flush if we encounter a | |
1067 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1068 | */ | |
1069 | static | |
1070 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1071 | poll_table *wait) | |
1072 | { | |
1073 | unsigned int mask = 0; | |
1074 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
1075 | struct channel *chan = event_notifier_group->chan; | |
1076 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1077 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1078 | int finalized, disabled; | |
1079 | unsigned long consumed, offset; | |
18f12d55 | 1080 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1081 | |
1082 | if (filp->f_mode & FMODE_READ) { | |
1083 | poll_wait_set_exclusive(wait); | |
1084 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1085 | ||
1086 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1087 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1088 | ||
1089 | /* | |
1090 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1091 | * finalized load before offsets loads. | |
1092 | */ | |
1093 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1094 | retry: | |
1095 | if (disabled) | |
1096 | return POLLERR; | |
1097 | ||
1098 | offset = lib_ring_buffer_get_offset(config, buf); | |
1099 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1100 | ||
1101 | /* | |
1102 | * If there is no buffer available to consume. | |
1103 | */ | |
1104 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1105 | /* | |
1106 | * If there is a non-empty subbuffer, flush and try again. | |
1107 | */ | |
18f12d55 | 1108 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1109 | lib_ring_buffer_switch_remote(buf); |
1110 | goto retry; | |
1111 | } | |
1112 | ||
1113 | if (finalized) | |
1114 | return POLLHUP; | |
1115 | else { | |
1116 | /* | |
1117 | * The memory barriers | |
1118 | * __wait_event()/wake_up_interruptible() take | |
1119 | * care of "raw_spin_is_locked" memory ordering. | |
1120 | */ | |
1121 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1122 | goto retry; | |
1123 | else | |
1124 | return 0; | |
1125 | } | |
1126 | } else { | |
1127 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1128 | >= chan->backend.buf_size) | |
1129 | return POLLPRI | POLLRDBAND; | |
1130 | else | |
1131 | return POLLIN | POLLRDNORM; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | return mask; | |
1136 | } | |
1137 | ||
1138 | /** | |
1139 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1140 | * @inode: opened inode | |
1141 | * @file: opened file | |
1142 | * | |
1143 | * Open implementation. Makes sure only one open instance of a buffer is | |
1144 | * done at a given moment. | |
1145 | */ | |
1146 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1147 | { | |
1148 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
1149 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1150 | ||
1151 | file->private_data = event_notifier_group; | |
1152 | return lib_ring_buffer_open(inode, file, buf); | |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1157 | * @inode: opened inode | |
1158 | * @file: opened file | |
1159 | * | |
1160 | * Release implementation. | |
1161 | */ | |
1162 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1163 | { | |
1164 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
1165 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1166 | int ret; | |
1167 | ||
1168 | ret = lib_ring_buffer_release(inode, file, buf); | |
1169 | if (ret) | |
1170 | return ret; | |
1171 | fput(event_notifier_group->file); | |
1172 | return 0; | |
1173 | } | |
1174 | ||
21f58fb7 FD |
1175 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1176 | .owner = THIS_MODULE, | |
db2511b4 MD |
1177 | .open = lttng_event_notifier_group_notif_open, |
1178 | .release = lttng_event_notifier_group_notif_release, | |
1179 | .read = lttng_event_notifier_group_notif_read, | |
1180 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1181 | }; |
1182 | ||
d83004aa JD |
1183 | /** |
1184 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1185 | * @filp: the file | |
1186 | * @wait: poll table | |
1187 | * | |
1188 | * Handles the poll operations for the metadata channels. | |
1189 | */ | |
ad1c05e1 | 1190 | static |
d83004aa JD |
1191 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1192 | poll_table *wait) | |
1193 | { | |
1194 | struct lttng_metadata_stream *stream = filp->private_data; | |
1195 | struct lib_ring_buffer *buf = stream->priv; | |
1196 | int finalized; | |
1197 | unsigned int mask = 0; | |
1198 | ||
1199 | if (filp->f_mode & FMODE_READ) { | |
1200 | poll_wait_set_exclusive(wait); | |
1201 | poll_wait(filp, &stream->read_wait, wait); | |
1202 | ||
1203 | finalized = stream->finalized; | |
1204 | ||
1205 | /* | |
1206 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1207 | * ordering finalized load before offsets loads. | |
1208 | */ | |
1209 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1210 | ||
1211 | if (finalized) | |
1212 | mask |= POLLHUP; | |
1213 | ||
92d9f5e6 | 1214 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1215 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1216 | stream->metadata_out) |
d83004aa | 1217 | mask |= POLLIN; |
92d9f5e6 | 1218 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1219 | } |
1220 | ||
1221 | return mask; | |
1222 | } | |
1223 | ||
f613e3e6 MD |
1224 | static |
1225 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1226 | unsigned int cmd, unsigned long arg) | |
1227 | { | |
1228 | struct lttng_metadata_stream *stream = filp->private_data; | |
1229 | ||
1230 | stream->metadata_out = stream->metadata_in; | |
1231 | } | |
1232 | ||
d1344afa JD |
1233 | /* |
1234 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1235 | * the consumer receives the content of the metadata cache unchanged. This is | |
1236 | * different from the metadata_regenerate where the offset from epoch is | |
1237 | * resampled, here we want the exact same content as the last time the metadata | |
1238 | * was generated. This command is only possible if all the metadata written | |
1239 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1240 | * metadata file. | |
1241 | * | |
1242 | * Return 0 on success, a negative value on error. | |
1243 | */ | |
1244 | static | |
1245 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1246 | { | |
1247 | int ret; | |
1248 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1249 | ||
1250 | mutex_lock(&cache->lock); | |
1251 | if (stream->metadata_out != cache->metadata_written) { | |
1252 | ret = -EBUSY; | |
1253 | goto end; | |
1254 | } | |
1255 | stream->metadata_out = 0; | |
1256 | stream->metadata_in = 0; | |
1257 | wake_up_interruptible(&stream->read_wait); | |
1258 | ret = 0; | |
1259 | ||
1260 | end: | |
1261 | mutex_unlock(&cache->lock); | |
1262 | return ret; | |
1263 | } | |
1264 | ||
d83004aa JD |
1265 | static |
1266 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1267 | unsigned int cmd, unsigned long arg) | |
1268 | { | |
1269 | int ret; | |
1270 | struct lttng_metadata_stream *stream = filp->private_data; | |
1271 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1272 | unsigned int rb_cmd; |
1273 | bool coherent; | |
1274 | ||
1275 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1276 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1277 | else | |
1278 | rb_cmd = cmd; | |
d83004aa JD |
1279 | |
1280 | switch (cmd) { | |
d83004aa JD |
1281 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1282 | { | |
35097f36 JD |
1283 | struct lttng_metadata_stream *stream = filp->private_data; |
1284 | struct lib_ring_buffer *buf = stream->priv; | |
1285 | struct channel *chan = buf->backend.chan; | |
1286 | ||
8b97fd42 | 1287 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1288 | if (ret > 0) { |
1289 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1290 | ret = 0; | |
1291 | } else if (ret < 0) | |
d83004aa JD |
1292 | goto err; |
1293 | break; | |
1294 | } | |
f613e3e6 MD |
1295 | case RING_BUFFER_GET_SUBBUF: |
1296 | { | |
1297 | /* | |
1298 | * Random access is not allowed for metadata channel. | |
1299 | */ | |
1300 | return -ENOSYS; | |
1301 | } | |
c6f05468 | 1302 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
1303 | case RING_BUFFER_FLUSH: |
1304 | { | |
1305 | struct lttng_metadata_stream *stream = filp->private_data; | |
1306 | struct lib_ring_buffer *buf = stream->priv; | |
1307 | struct channel *chan = buf->backend.chan; | |
1308 | ||
1309 | /* | |
1310 | * Before doing the actual ring buffer flush, write up to one | |
1311 | * packet of metadata in the ring buffer. | |
1312 | */ | |
8b97fd42 | 1313 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1314 | if (ret < 0) |
1315 | goto err; | |
1316 | break; | |
1317 | } | |
9616f0bf JD |
1318 | case RING_BUFFER_GET_METADATA_VERSION: |
1319 | { | |
1320 | struct lttng_metadata_stream *stream = filp->private_data; | |
1321 | ||
1322 | return put_u64(stream->version, arg); | |
1323 | } | |
d1344afa JD |
1324 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1325 | { | |
1326 | struct lttng_metadata_stream *stream = filp->private_data; | |
1327 | ||
1328 | return lttng_metadata_cache_dump(stream); | |
1329 | } | |
8b97fd42 MD |
1330 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1331 | { | |
1332 | struct lttng_metadata_stream *stream = filp->private_data; | |
1333 | struct lib_ring_buffer *buf = stream->priv; | |
1334 | struct channel *chan = buf->backend.chan; | |
1335 | ||
1336 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1337 | if (ret > 0) { | |
1338 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1339 | ret = 0; | |
1340 | } else if (ret < 0) { | |
1341 | goto err; | |
1342 | } | |
1343 | break; | |
1344 | } | |
d83004aa JD |
1345 | default: |
1346 | break; | |
1347 | } | |
f613e3e6 MD |
1348 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1349 | ||
d83004aa | 1350 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1351 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1352 | if (ret < 0) |
1353 | goto err; | |
d83004aa | 1354 | |
f613e3e6 MD |
1355 | switch (cmd) { |
1356 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1357 | { | |
1358 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1359 | cmd, arg); | |
1360 | break; | |
1361 | } | |
8b97fd42 MD |
1362 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1363 | { | |
1364 | return put_u32(coherent, arg); | |
1365 | } | |
f613e3e6 MD |
1366 | default: |
1367 | break; | |
1368 | } | |
d83004aa JD |
1369 | err: |
1370 | return ret; | |
1371 | } | |
1372 | ||
aeb9064d | 1373 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1374 | static |
1375 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1376 | unsigned int cmd, unsigned long arg) | |
1377 | { | |
1378 | int ret; | |
1379 | struct lttng_metadata_stream *stream = filp->private_data; | |
1380 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1381 | unsigned int rb_cmd; |
1382 | bool coherent; | |
1383 | ||
1384 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1385 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1386 | else | |
1387 | rb_cmd = cmd; | |
d83004aa JD |
1388 | |
1389 | switch (cmd) { | |
d83004aa JD |
1390 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1391 | { | |
35097f36 JD |
1392 | struct lttng_metadata_stream *stream = filp->private_data; |
1393 | struct lib_ring_buffer *buf = stream->priv; | |
1394 | struct channel *chan = buf->backend.chan; | |
1395 | ||
8b97fd42 | 1396 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1397 | if (ret > 0) { |
1398 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1399 | ret = 0; | |
1400 | } else if (ret < 0) | |
d83004aa JD |
1401 | goto err; |
1402 | break; | |
1403 | } | |
f613e3e6 MD |
1404 | case RING_BUFFER_GET_SUBBUF: |
1405 | { | |
1406 | /* | |
1407 | * Random access is not allowed for metadata channel. | |
1408 | */ | |
1409 | return -ENOSYS; | |
1410 | } | |
c6f05468 | 1411 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1412 | case RING_BUFFER_FLUSH: |
1413 | { | |
1414 | struct lttng_metadata_stream *stream = filp->private_data; | |
1415 | struct lib_ring_buffer *buf = stream->priv; | |
1416 | struct channel *chan = buf->backend.chan; | |
1417 | ||
1418 | /* | |
1419 | * Before doing the actual ring buffer flush, write up to one | |
1420 | * packet of metadata in the ring buffer. | |
1421 | */ | |
8b97fd42 | 1422 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1423 | if (ret < 0) |
1424 | goto err; | |
1425 | break; | |
1426 | } | |
1427 | case RING_BUFFER_GET_METADATA_VERSION: | |
1428 | { | |
1429 | struct lttng_metadata_stream *stream = filp->private_data; | |
1430 | ||
1431 | return put_u64(stream->version, arg); | |
1432 | } | |
d1344afa JD |
1433 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1434 | { | |
1435 | struct lttng_metadata_stream *stream = filp->private_data; | |
1436 | ||
1437 | return lttng_metadata_cache_dump(stream); | |
1438 | } | |
8b97fd42 MD |
1439 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1440 | { | |
1441 | struct lttng_metadata_stream *stream = filp->private_data; | |
1442 | struct lib_ring_buffer *buf = stream->priv; | |
1443 | struct channel *chan = buf->backend.chan; | |
1444 | ||
1445 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1446 | if (ret > 0) { | |
1447 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1448 | ret = 0; | |
1449 | } else if (ret < 0) { | |
1450 | goto err; | |
1451 | } | |
1452 | break; | |
1453 | } | |
d83004aa JD |
1454 | default: |
1455 | break; | |
1456 | } | |
f613e3e6 MD |
1457 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1458 | ||
d83004aa | 1459 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1460 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1461 | if (ret < 0) |
1462 | goto err; | |
d83004aa | 1463 | |
f613e3e6 MD |
1464 | switch (cmd) { |
1465 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1466 | { | |
1467 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1468 | cmd, arg); | |
1469 | break; | |
1470 | } | |
8b97fd42 MD |
1471 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1472 | { | |
1473 | return put_u32(coherent, arg); | |
1474 | } | |
f613e3e6 MD |
1475 | default: |
1476 | break; | |
1477 | } | |
d83004aa JD |
1478 | err: |
1479 | return ret; | |
1480 | } | |
aeb9064d | 1481 | #endif |
d83004aa | 1482 | |
b3b8072b MD |
1483 | /* |
1484 | * This is not used by anonymous file descriptors. This code is left | |
1485 | * there if we ever want to implement an inode with open() operation. | |
1486 | */ | |
d83004aa JD |
1487 | static |
1488 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1489 | { | |
1490 | struct lttng_metadata_stream *stream = inode->i_private; | |
1491 | struct lib_ring_buffer *buf = stream->priv; | |
1492 | ||
1493 | file->private_data = buf; | |
b3b8072b MD |
1494 | /* |
1495 | * Since life-time of metadata cache differs from that of | |
1496 | * session, we need to keep our own reference on the transport. | |
1497 | */ | |
1498 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1499 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1500 | return -EBUSY; |
1501 | } | |
d83004aa JD |
1502 | return lib_ring_buffer_open(inode, file, buf); |
1503 | } | |
1504 | ||
1505 | static | |
1506 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1507 | { | |
1508 | struct lttng_metadata_stream *stream = file->private_data; | |
1509 | struct lib_ring_buffer *buf = stream->priv; | |
1510 | ||
92143b2c MD |
1511 | mutex_lock(&stream->metadata_cache->lock); |
1512 | list_del(&stream->list); | |
1513 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1514 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1515 | module_put(stream->transport->owner); |
92143b2c | 1516 | kfree(stream); |
d83004aa JD |
1517 | return lib_ring_buffer_release(inode, file, buf); |
1518 | } | |
1519 | ||
1520 | static | |
1521 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1522 | struct pipe_inode_info *pipe, size_t len, | |
1523 | unsigned int flags) | |
1524 | { | |
1525 | struct lttng_metadata_stream *stream = in->private_data; | |
1526 | struct lib_ring_buffer *buf = stream->priv; | |
1527 | ||
1528 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1529 | flags, buf); | |
1530 | } | |
1531 | ||
1532 | static | |
1533 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1534 | struct vm_area_struct *vma) | |
1535 | { | |
1536 | struct lttng_metadata_stream *stream = filp->private_data; | |
1537 | struct lib_ring_buffer *buf = stream->priv; | |
1538 | ||
1539 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1540 | } | |
1541 | ||
1542 | static | |
1543 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1544 | .owner = THIS_MODULE, | |
1545 | .open = lttng_metadata_ring_buffer_open, | |
1546 | .release = lttng_metadata_ring_buffer_release, | |
1547 | .poll = lttng_metadata_ring_buffer_poll, | |
1548 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1549 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1550 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1551 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1552 | #ifdef CONFIG_COMPAT | |
1553 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1554 | #endif | |
1555 | }; | |
1556 | ||
1557 | static | |
1558 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1559 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1560 | { |
ad1c05e1 | 1561 | int stream_fd, ret; |
11b5a3c2 | 1562 | struct file *stream_file; |
ad1c05e1 | 1563 | |
4ac10b76 | 1564 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1565 | if (stream_fd < 0) { |
1566 | ret = stream_fd; | |
1567 | goto fd_error; | |
1568 | } | |
a3fcd499 | 1569 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1570 | if (IS_ERR(stream_file)) { |
1571 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1572 | goto file_error; |
1573 | } | |
409453cb MD |
1574 | /* |
1575 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1576 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1577 | * file descriptor, so we set FMODE_PREAD here. | |
1578 | */ | |
d7b6f197 | 1579 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1580 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1581 | /* |
1582 | * The stream holds a reference to the channel within the generic ring | |
1583 | * buffer library, so no need to hold a refcount on the channel and | |
1584 | * session files here. | |
1585 | */ | |
ad1c05e1 MD |
1586 | return stream_fd; |
1587 | ||
1588 | file_error: | |
1589 | put_unused_fd(stream_fd); | |
d83004aa JD |
1590 | fd_error: |
1591 | return ret; | |
1592 | } | |
1593 | ||
1594 | static | |
1595 | int lttng_abi_open_stream(struct file *channel_file) | |
1596 | { | |
1597 | struct lttng_channel *channel = channel_file->private_data; | |
1598 | struct lib_ring_buffer *buf; | |
1599 | int ret; | |
1600 | void *stream_priv; | |
1601 | ||
1602 | buf = channel->ops->buffer_read_open(channel->chan); | |
1603 | if (!buf) | |
1604 | return -ENOENT; | |
1605 | ||
1606 | stream_priv = buf; | |
1607 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1608 | <tng_stream_ring_buffer_file_operations, |
1609 | "[lttng_stream]"); | |
d83004aa JD |
1610 | if (ret < 0) |
1611 | goto fd_error; | |
1612 | ||
1613 | return ret; | |
1614 | ||
1615 | fd_error: | |
1616 | channel->ops->buffer_read_close(buf); | |
1617 | return ret; | |
1618 | } | |
1619 | ||
1620 | static | |
1621 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1622 | { | |
1623 | struct lttng_channel *channel = channel_file->private_data; | |
1624 | struct lttng_session *session = channel->session; | |
1625 | struct lib_ring_buffer *buf; | |
1626 | int ret; | |
1627 | struct lttng_metadata_stream *metadata_stream; | |
1628 | void *stream_priv; | |
1629 | ||
1630 | buf = channel->ops->buffer_read_open(channel->chan); | |
1631 | if (!buf) | |
1632 | return -ENOENT; | |
1633 | ||
1634 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1635 | GFP_KERNEL); | |
b3b8072b MD |
1636 | if (!metadata_stream) { |
1637 | ret = -ENOMEM; | |
1638 | goto nomem; | |
1639 | } | |
d83004aa JD |
1640 | metadata_stream->metadata_cache = session->metadata_cache; |
1641 | init_waitqueue_head(&metadata_stream->read_wait); | |
1642 | metadata_stream->priv = buf; | |
1643 | stream_priv = metadata_stream; | |
b3b8072b | 1644 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
1645 | /* Initial state is an empty metadata, considered as incoherent. */ |
1646 | metadata_stream->coherent = false; | |
b3b8072b MD |
1647 | |
1648 | /* | |
1649 | * Since life-time of metadata cache differs from that of | |
1650 | * session, we need to keep our own reference on the transport. | |
1651 | */ | |
1652 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1653 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1654 | ret = -EINVAL; |
1655 | goto notransport; | |
1656 | } | |
1657 | ||
901aaa5f FD |
1658 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1659 | ret = -EOVERFLOW; | |
9c1f4643 | 1660 | goto kref_error; |
901aaa5f FD |
1661 | } |
1662 | ||
d83004aa | 1663 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1664 | <tng_metadata_ring_buffer_file_operations, |
1665 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1666 | if (ret < 0) |
1667 | goto fd_error; | |
1668 | ||
92143b2c | 1669 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1670 | list_add(&metadata_stream->list, |
1671 | &session->metadata_cache->metadata_stream); | |
92143b2c | 1672 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1673 | return ret; |
1674 | ||
ad1c05e1 | 1675 | fd_error: |
9c1f4643 MD |
1676 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1677 | kref_error: | |
b3b8072b MD |
1678 | module_put(metadata_stream->transport->owner); |
1679 | notransport: | |
1680 | kfree(metadata_stream); | |
1681 | nomem: | |
11b5a3c2 | 1682 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1683 | return ret; |
1684 | } | |
1685 | ||
21f58fb7 FD |
1686 | static |
1687 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1688 | { | |
1689 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
1690 | struct channel *chan = event_notifier_group->chan; | |
1691 | struct lib_ring_buffer *buf; | |
1692 | int ret; | |
1693 | void *stream_priv; | |
1694 | ||
1695 | buf = event_notifier_group->ops->buffer_read_open(chan); | |
1696 | if (!buf) | |
1697 | return -ENOENT; | |
1698 | ||
1699 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1700 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1701 | ret = -EOVERFLOW; | |
1702 | goto refcount_error; | |
1703 | } | |
1704 | event_notifier_group->buf = buf; | |
1705 | stream_priv = event_notifier_group; | |
1706 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1707 | <tng_event_notifier_group_notif_fops, | |
1708 | "[lttng_event_notifier_stream]"); | |
1709 | if (ret < 0) | |
1710 | goto fd_error; | |
1711 | ||
1712 | return ret; | |
1713 | ||
1714 | fd_error: | |
1715 | atomic_long_dec(¬if_file->f_count); | |
1716 | refcount_error: | |
1717 | event_notifier_group->ops->buffer_read_close(buf); | |
1718 | return ret; | |
1719 | } | |
1720 | ||
badfe9f5 MD |
1721 | static |
1722 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
1723 | { | |
1724 | /* Limit ABI to implemented features. */ | |
1725 | switch (event_param->instrumentation) { | |
1726 | case LTTNG_KERNEL_SYSCALL: | |
1727 | switch (event_param->u.syscall.entryexit) { | |
c5d12b5b FD |
1728 | case LTTNG_KERNEL_SYSCALL_ENTRY: |
1729 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
badfe9f5 MD |
1730 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: |
1731 | break; | |
1732 | default: | |
1733 | return -EINVAL; | |
1734 | } | |
1735 | switch (event_param->u.syscall.abi) { | |
1736 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1737 | break; | |
1738 | default: | |
1739 | return -EINVAL; | |
1740 | } | |
1741 | switch (event_param->u.syscall.match) { | |
cff6938b | 1742 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: |
badfe9f5 MD |
1743 | break; |
1744 | default: | |
1745 | return -EINVAL; | |
1746 | } | |
1747 | break; | |
1748 | ||
1749 | case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */ | |
1750 | case LTTNG_KERNEL_KPROBE: /* Fallthrough */ | |
1751 | case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */ | |
1752 | case LTTNG_KERNEL_NOOP: /* Fallthrough */ | |
1753 | case LTTNG_KERNEL_UPROBE: | |
1754 | break; | |
1755 | ||
1756 | case LTTNG_KERNEL_FUNCTION: /* Fallthrough */ | |
1757 | default: | |
1758 | return -EINVAL; | |
1759 | } | |
1760 | return 0; | |
1761 | } | |
1762 | ||
653fe716 | 1763 | static |
c0e31d2e | 1764 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1765 | struct lttng_kernel_event *event_param) |
653fe716 | 1766 | { |
a90917c3 | 1767 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1768 | int event_fd, ret; |
11b5a3c2 | 1769 | struct file *event_file; |
3c997079 | 1770 | void *priv; |
653fe716 | 1771 | |
6dccd6c1 JD |
1772 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1773 | switch (event_param->instrumentation) { | |
7371f44c | 1774 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1775 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1776 | break; |
ab2277d6 | 1777 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1778 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1779 | break; |
ab2277d6 | 1780 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1781 | WARN_ON_ONCE(1); |
1782 | /* Not implemented. */ | |
e0a7a7c4 MD |
1783 | break; |
1784 | default: | |
1785 | break; | |
1786 | } | |
33a39a3c MD |
1787 | event_fd = lttng_get_unused_fd(); |
1788 | if (event_fd < 0) { | |
1789 | ret = event_fd; | |
1790 | goto fd_error; | |
1791 | } | |
1792 | event_file = anon_inode_getfile("[lttng_event]", | |
1793 | <tng_event_fops, | |
1794 | NULL, O_RDWR); | |
1795 | if (IS_ERR(event_file)) { | |
1796 | ret = PTR_ERR(event_file); | |
1797 | goto file_error; | |
1798 | } | |
9c1f4643 | 1799 | /* The event holds a reference on the channel */ |
98d7281c | 1800 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1801 | ret = -EOVERFLOW; |
9c1f4643 MD |
1802 | goto refcount_error; |
1803 | } | |
badfe9f5 MD |
1804 | ret = lttng_abi_validate_event_param(event_param); |
1805 | if (ret) | |
1806 | goto event_error; | |
33a39a3c MD |
1807 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1808 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
b2bc0bc8 | 1809 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1810 | |
4993071a PP |
1811 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1812 | /* | |
1813 | * If the event name is a star globbing pattern, | |
1814 | * we create the special star globbing enabler. | |
1815 | */ | |
b2bc0bc8 | 1816 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1817 | event_param, channel); |
3c997079 | 1818 | } else { |
b2bc0bc8 | 1819 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1820 | event_param, channel); |
1ec65de1 | 1821 | } |
b2bc0bc8 | 1822 | priv = event_enabler; |
33a39a3c MD |
1823 | } else { |
1824 | struct lttng_event *event; | |
4ee2453d | 1825 | |
33a39a3c MD |
1826 | /* |
1827 | * We tolerate no failure path after event creation. It | |
1828 | * will stay invariant for the rest of the session. | |
1829 | */ | |
1830 | event = lttng_event_create(channel, event_param, | |
1831 | NULL, NULL, | |
1832 | event_param->instrumentation); | |
1833 | WARN_ON_ONCE(!event); | |
1834 | if (IS_ERR(event)) { | |
1835 | ret = PTR_ERR(event); | |
1836 | goto event_error; | |
80f87dd2 | 1837 | } |
33a39a3c | 1838 | priv = event; |
03037b98 | 1839 | } |
33a39a3c MD |
1840 | event_file->private_data = priv; |
1841 | fd_install(event_fd, event_file); | |
653fe716 MD |
1842 | return event_fd; |
1843 | ||
03037b98 | 1844 | event_error: |
9c1f4643 MD |
1845 | atomic_long_dec(&channel_file->f_count); |
1846 | refcount_error: | |
c0e31d2e | 1847 | fput(event_file); |
653fe716 MD |
1848 | file_error: |
1849 | put_unused_fd(event_fd); | |
1850 | fd_error: | |
653fe716 MD |
1851 | return ret; |
1852 | } | |
ad1c05e1 | 1853 | |
dffef45d FD |
1854 | static |
1855 | long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1856 | { | |
2b16f0c9 | 1857 | struct lttng_event_notifier *event_notifier; |
dffef45d FD |
1858 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
1859 | enum lttng_event_type *evtype = file->private_data; | |
1860 | ||
1861 | switch (cmd) { | |
1862 | case LTTNG_KERNEL_ENABLE: | |
1863 | switch (*evtype) { | |
1864 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
1865 | event_notifier = file->private_data; |
1866 | return lttng_event_notifier_enable(event_notifier); | |
dffef45d FD |
1867 | case LTTNG_TYPE_ENABLER: |
1868 | event_notifier_enabler = file->private_data; | |
1869 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
1870 | default: | |
1871 | WARN_ON_ONCE(1); | |
1872 | return -ENOSYS; | |
1873 | } | |
1874 | case LTTNG_KERNEL_DISABLE: | |
1875 | switch (*evtype) { | |
1876 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
1877 | event_notifier = file->private_data; |
1878 | return lttng_event_notifier_disable(event_notifier); | |
dffef45d FD |
1879 | case LTTNG_TYPE_ENABLER: |
1880 | event_notifier_enabler = file->private_data; | |
1881 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
1882 | default: | |
1883 | WARN_ON_ONCE(1); | |
1884 | return -ENOSYS; | |
1885 | } | |
1886 | case LTTNG_KERNEL_FILTER: | |
1887 | switch (*evtype) { | |
1888 | case LTTNG_TYPE_EVENT: | |
1889 | return -EINVAL; | |
1890 | case LTTNG_TYPE_ENABLER: | |
1891 | event_notifier_enabler = file->private_data; | |
183e8b3a FD |
1892 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
1893 | event_notifier_enabler, | |
dffef45d FD |
1894 | (struct lttng_kernel_filter_bytecode __user *) arg); |
1895 | default: | |
1896 | WARN_ON_ONCE(1); | |
1897 | return -ENOSYS; | |
1898 | } | |
99d223ad FD |
1899 | |
1900 | case LTTNG_KERNEL_CAPTURE: | |
1901 | switch (*evtype) { | |
1902 | case LTTNG_TYPE_EVENT: | |
1903 | return -EINVAL; | |
1904 | case LTTNG_TYPE_ENABLER: | |
1905 | event_notifier_enabler = file->private_data; | |
1906 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
1907 | event_notifier_enabler, | |
1908 | (struct lttng_kernel_capture_bytecode __user *) arg); | |
1909 | default: | |
1910 | WARN_ON_ONCE(1); | |
1911 | return -ENOSYS; | |
1912 | } | |
9de67196 FD |
1913 | case LTTNG_KERNEL_ADD_CALLSITE: |
1914 | switch (*evtype) { | |
1915 | case LTTNG_TYPE_EVENT: | |
1916 | event_notifier = file->private_data; | |
1917 | return lttng_event_notifier_add_callsite(event_notifier, | |
1918 | (struct lttng_kernel_event_callsite __user *) arg); | |
1919 | case LTTNG_TYPE_ENABLER: | |
1920 | return -EINVAL; | |
1921 | default: | |
1922 | WARN_ON_ONCE(1); | |
1923 | return -ENOSYS; | |
1924 | } | |
dffef45d FD |
1925 | default: |
1926 | return -ENOIOCTLCMD; | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | static | |
1931 | int lttng_event_notifier_release(struct inode *inode, struct file *file) | |
1932 | { | |
1933 | struct lttng_event_notifier *event_notifier; | |
1934 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1935 | enum lttng_event_type *evtype = file->private_data; | |
1936 | ||
1937 | if (!evtype) | |
1938 | return 0; | |
1939 | ||
1940 | switch (*evtype) { | |
1941 | case LTTNG_TYPE_EVENT: | |
1942 | event_notifier = file->private_data; | |
1943 | if (event_notifier) | |
1944 | fput(event_notifier->group->file); | |
1945 | break; | |
1946 | case LTTNG_TYPE_ENABLER: | |
1947 | event_notifier_enabler = file->private_data; | |
1948 | if (event_notifier_enabler) | |
1949 | fput(event_notifier_enabler->group->file); | |
1950 | break; | |
1951 | default: | |
1952 | WARN_ON_ONCE(1); | |
1953 | break; | |
1954 | } | |
1955 | ||
1956 | return 0; | |
1957 | } | |
1958 | ||
1959 | static const struct file_operations lttng_event_notifier_fops = { | |
1960 | .owner = THIS_MODULE, | |
1961 | .release = lttng_event_notifier_release, | |
1962 | .unlocked_ioctl = lttng_event_notifier_ioctl, | |
1963 | #ifdef CONFIG_COMPAT | |
1964 | .compat_ioctl = lttng_event_notifier_ioctl, | |
1965 | #endif | |
1966 | }; | |
1967 | ||
1968 | static | |
1969 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
1970 | struct lttng_kernel_event_notifier *event_notifier_param) | |
1971 | { | |
1972 | struct lttng_event_notifier_group *event_notifier_group = | |
1973 | event_notifier_group_file->private_data; | |
1974 | int event_notifier_fd, ret; | |
1975 | struct file *event_notifier_file; | |
1976 | void *priv; | |
1977 | ||
1978 | switch (event_notifier_param->event.instrumentation) { | |
1979 | case LTTNG_KERNEL_TRACEPOINT: | |
9de67196 | 1980 | case LTTNG_KERNEL_UPROBE: |
b01155ba | 1981 | break; |
dffef45d | 1982 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
1983 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1984 | break; | |
8a8ac9a8 FD |
1985 | case LTTNG_KERNEL_SYSCALL: |
1986 | break; | |
dffef45d | 1987 | case LTTNG_KERNEL_KRETPROBE: |
9de67196 | 1988 | /* Placing an event notifier on kretprobe is not supported. */ |
dffef45d FD |
1989 | case LTTNG_KERNEL_FUNCTION: |
1990 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
1991 | default: |
1992 | ret = -EINVAL; | |
1993 | goto inval_instr; | |
1994 | } | |
1995 | ||
1996 | event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1997 | ||
1998 | event_notifier_fd = lttng_get_unused_fd(); | |
1999 | if (event_notifier_fd < 0) { | |
2000 | ret = event_notifier_fd; | |
2001 | goto fd_error; | |
2002 | } | |
2003 | ||
2004 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
2005 | <tng_event_notifier_fops, | |
2006 | NULL, O_RDWR); | |
2007 | if (IS_ERR(event_notifier_file)) { | |
2008 | ret = PTR_ERR(event_notifier_file); | |
2009 | goto file_error; | |
2010 | } | |
2011 | ||
2012 | /* The event notifier holds a reference on the event notifier group. */ | |
2013 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2014 | ret = -EOVERFLOW; | |
2015 | goto refcount_error; | |
2016 | } | |
2017 | ||
2018 | if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT | |
2019 | || event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) { | |
2020 | struct lttng_event_notifier_enabler *enabler; | |
2021 | ||
2022 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2023 | /* | |
2024 | * If the event name is a star globbing pattern, | |
2025 | * we create the special star globbing enabler. | |
2026 | */ | |
2027 | enabler = lttng_event_notifier_enabler_create( | |
2028 | event_notifier_group, | |
2029 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
2030 | event_notifier_param); | |
2031 | } else { | |
2032 | enabler = lttng_event_notifier_enabler_create( | |
2033 | event_notifier_group, | |
2034 | LTTNG_ENABLER_FORMAT_NAME, | |
2035 | event_notifier_param); | |
2036 | } | |
2037 | priv = enabler; | |
2038 | } else { | |
2039 | struct lttng_event_notifier *event_notifier; | |
2040 | ||
2041 | /* | |
2042 | * We tolerate no failure path after event notifier creation. | |
2043 | * It will stay invariant for the rest of the session. | |
2044 | */ | |
2045 | event_notifier = lttng_event_notifier_create(NULL, | |
99f52fcc FD |
2046 | event_notifier_param->event.token, |
2047 | event_notifier_param->error_counter_index, | |
2048 | event_notifier_group, | |
dffef45d FD |
2049 | event_notifier_param, NULL, |
2050 | event_notifier_param->event.instrumentation); | |
2051 | WARN_ON_ONCE(!event_notifier); | |
2052 | if (IS_ERR(event_notifier)) { | |
2053 | ret = PTR_ERR(event_notifier); | |
2054 | goto event_notifier_error; | |
2055 | } | |
2056 | priv = event_notifier; | |
2057 | } | |
2058 | event_notifier_file->private_data = priv; | |
2059 | fd_install(event_notifier_fd, event_notifier_file); | |
2060 | return event_notifier_fd; | |
2061 | ||
2062 | event_notifier_error: | |
2063 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2064 | refcount_error: | |
2065 | fput(event_notifier_file); | |
2066 | file_error: | |
2067 | put_unused_fd(event_notifier_fd); | |
2068 | fd_error: | |
2069 | inval_instr: | |
2070 | return ret; | |
2071 | } | |
2072 | ||
99f52fcc FD |
2073 | static |
2074 | long lttng_abi_event_notifier_group_create_error_counter( | |
2075 | struct file *event_notifier_group_file, | |
2076 | const struct lttng_kernel_counter_conf *error_counter_conf) | |
2077 | { | |
2078 | int counter_fd, ret; | |
2079 | char *counter_transport_name; | |
2080 | size_t counter_len; | |
2081 | struct lttng_counter *counter = NULL; | |
2082 | struct file *counter_file; | |
2083 | struct lttng_event_notifier_group *event_notifier_group = | |
2084 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2085 | ||
2086 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) { | |
2087 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); | |
2088 | return -EINVAL; | |
2089 | } | |
2090 | ||
2091 | if (error_counter_conf->number_dimensions != 1) { | |
2092 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2093 | return -EINVAL; | |
2094 | } | |
2095 | ||
2096 | switch (error_counter_conf->bitness) { | |
2097 | case LTTNG_KERNEL_COUNTER_BITNESS_64: | |
2098 | counter_transport_name = "counter-per-cpu-64-modular"; | |
2099 | break; | |
2100 | case LTTNG_KERNEL_COUNTER_BITNESS_32: | |
2101 | counter_transport_name = "counter-per-cpu-32-modular"; | |
2102 | break; | |
2103 | default: | |
2104 | return -EINVAL; | |
2105 | } | |
2106 | ||
2107 | /* | |
2108 | * Lock sessions to provide mutual exclusion against concurrent | |
2109 | * modification of event_notifier group, which would result in | |
2110 | * overwriting the error counter if set concurrently. | |
2111 | */ | |
2112 | lttng_lock_sessions(); | |
2113 | ||
2114 | if (event_notifier_group->error_counter) { | |
2115 | printk(KERN_ERR "Error counter already created in event_notifier group\n"); | |
2116 | ret = -EBUSY; | |
2117 | goto fd_error; | |
2118 | } | |
2119 | ||
2120 | counter_fd = lttng_get_unused_fd(); | |
2121 | if (counter_fd < 0) { | |
2122 | ret = counter_fd; | |
2123 | goto fd_error; | |
2124 | } | |
2125 | ||
2126 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2127 | <tng_counter_fops, | |
2128 | NULL, O_RDONLY); | |
2129 | if (IS_ERR(counter_file)) { | |
2130 | ret = PTR_ERR(counter_file); | |
2131 | goto file_error; | |
2132 | } | |
2133 | ||
2134 | counter_len = error_counter_conf->dimensions[0].size; | |
2135 | ||
2136 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2137 | ret = -EOVERFLOW; | |
2138 | goto refcount_error; | |
2139 | } | |
2140 | ||
2141 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2142 | 1, &counter_len); | |
2143 | if (!counter) { | |
2144 | ret = -EINVAL; | |
2145 | goto counter_error; | |
2146 | } | |
2147 | ||
99f52fcc | 2148 | event_notifier_group->error_counter_len = counter_len; |
ab04d7b1 MD |
2149 | /* |
2150 | * store-release to publish error counter matches load-acquire | |
2151 | * in record_error. Ensures the counter is created and the | |
2152 | * error_counter_len is set before they are used. | |
2153 | */ | |
6657edec | 2154 | lttng_smp_store_release(&event_notifier_group->error_counter, counter); |
99f52fcc FD |
2155 | |
2156 | counter->file = counter_file; | |
2157 | counter->owner = event_notifier_group->file; | |
2158 | counter_file->private_data = counter; | |
2159 | /* Ownership transferred. */ | |
2160 | counter = NULL; | |
2161 | ||
2162 | fd_install(counter_fd, counter_file); | |
2163 | lttng_unlock_sessions(); | |
2164 | ||
2165 | return counter_fd; | |
2166 | ||
2167 | counter_error: | |
2168 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2169 | refcount_error: | |
2170 | fput(counter_file); | |
2171 | file_error: | |
2172 | put_unused_fd(counter_fd); | |
2173 | fd_error: | |
2174 | lttng_unlock_sessions(); | |
2175 | return ret; | |
2176 | } | |
2177 | ||
750b05f2 FD |
2178 | static |
2179 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2180 | unsigned long arg) | |
2181 | { | |
2182 | switch (cmd) { | |
21f58fb7 FD |
2183 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
2184 | { | |
2185 | return lttng_abi_open_event_notifier_group_stream(file); | |
2186 | } | |
dffef45d FD |
2187 | case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE: |
2188 | { | |
2189 | struct lttng_kernel_event_notifier uevent_notifier_param; | |
2190 | ||
2191 | if (copy_from_user(&uevent_notifier_param, | |
2192 | (struct lttng_kernel_event_notifier __user *) arg, | |
2193 | sizeof(uevent_notifier_param))) | |
2194 | return -EFAULT; | |
2195 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2196 | } | |
99f52fcc FD |
2197 | case LTTNG_KERNEL_COUNTER: |
2198 | { | |
2199 | struct lttng_kernel_counter_conf uerror_counter_conf; | |
2200 | ||
2201 | if (copy_from_user(&uerror_counter_conf, | |
2202 | (struct lttng_kernel_counter_conf __user *) arg, | |
2203 | sizeof(uerror_counter_conf))) | |
2204 | return -EFAULT; | |
2205 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2206 | &uerror_counter_conf); | |
2207 | } | |
750b05f2 FD |
2208 | default: |
2209 | return -ENOIOCTLCMD; | |
2210 | } | |
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | static | |
2215 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2216 | { | |
2217 | struct lttng_event_notifier_group *event_notifier_group = | |
2218 | file->private_data; | |
2219 | ||
2220 | if (event_notifier_group) | |
2221 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2222 | return 0; | |
2223 | } | |
2224 | ||
2225 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2226 | .owner = THIS_MODULE, | |
2227 | .release = lttng_event_notifier_group_release, | |
2228 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2229 | #ifdef CONFIG_COMPAT | |
2230 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2231 | #endif | |
2232 | }; | |
2233 | ||
ad1c05e1 MD |
2234 | /** |
2235 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2236 | * | |
c0e31d2e | 2237 | * @file: the file |
ad1c05e1 MD |
2238 | * @cmd: the command |
2239 | * @arg: command arg | |
2240 | * | |
2241 | * This ioctl implements lttng commands: | |
38d024ae | 2242 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
2243 | * Returns an event stream file descriptor or failure. |
2244 | * (typically, one event stream records events from one CPU) | |
38d024ae | 2245 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 2246 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
2247 | * LTTNG_KERNEL_CONTEXT |
2248 | * Prepend a context field to each event in the channel | |
e64957da MD |
2249 | * LTTNG_KERNEL_ENABLE |
2250 | * Enable recording for events in this channel (weak enable) | |
2251 | * LTTNG_KERNEL_DISABLE | |
2252 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 2253 | * |
baf20995 MD |
2254 | * Channel and event file descriptors also hold a reference on the session. |
2255 | */ | |
ad1c05e1 | 2256 | static |
c0e31d2e | 2257 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2258 | { |
a90917c3 | 2259 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 2260 | |
baf20995 | 2261 | switch (cmd) { |
6dccd6c1 | 2262 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2263 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 2264 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
2265 | case LTTNG_KERNEL_OLD_EVENT: |
2266 | { | |
2267 | struct lttng_kernel_event *uevent_param; | |
2268 | struct lttng_kernel_old_event *old_uevent_param; | |
2269 | int ret; | |
2270 | ||
2271 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
2272 | GFP_KERNEL); | |
2273 | if (!uevent_param) { | |
2274 | ret = -ENOMEM; | |
2275 | goto old_event_end; | |
2276 | } | |
2277 | old_uevent_param = kmalloc( | |
2278 | sizeof(struct lttng_kernel_old_event), | |
2279 | GFP_KERNEL); | |
2280 | if (!old_uevent_param) { | |
2281 | ret = -ENOMEM; | |
2282 | goto old_event_error_free_param; | |
2283 | } | |
2284 | if (copy_from_user(old_uevent_param, | |
2285 | (struct lttng_kernel_old_event __user *) arg, | |
2286 | sizeof(struct lttng_kernel_old_event))) { | |
2287 | ret = -EFAULT; | |
2288 | goto old_event_error_free_old_param; | |
2289 | } | |
2290 | ||
2291 | memcpy(uevent_param->name, old_uevent_param->name, | |
2292 | sizeof(uevent_param->name)); | |
2293 | uevent_param->instrumentation = | |
2294 | old_uevent_param->instrumentation; | |
2295 | ||
2296 | switch (old_uevent_param->instrumentation) { | |
2297 | case LTTNG_KERNEL_KPROBE: | |
2298 | uevent_param->u.kprobe.addr = | |
2299 | old_uevent_param->u.kprobe.addr; | |
2300 | uevent_param->u.kprobe.offset = | |
2301 | old_uevent_param->u.kprobe.offset; | |
2302 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2303 | old_uevent_param->u.kprobe.symbol_name, | |
2304 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2305 | break; | |
2306 | case LTTNG_KERNEL_KRETPROBE: | |
2307 | uevent_param->u.kretprobe.addr = | |
2308 | old_uevent_param->u.kretprobe.addr; | |
2309 | uevent_param->u.kretprobe.offset = | |
2310 | old_uevent_param->u.kretprobe.offset; | |
2311 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2312 | old_uevent_param->u.kretprobe.symbol_name, | |
2313 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2314 | break; | |
2315 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
2316 | WARN_ON_ONCE(1); |
2317 | /* Not implemented. */ | |
6dccd6c1 JD |
2318 | break; |
2319 | default: | |
2320 | break; | |
2321 | } | |
2322 | ret = lttng_abi_create_event(file, uevent_param); | |
2323 | ||
2324 | old_event_error_free_old_param: | |
2325 | kfree(old_uevent_param); | |
2326 | old_event_error_free_param: | |
2327 | kfree(uevent_param); | |
2328 | old_event_end: | |
2329 | return ret; | |
2330 | } | |
38d024ae | 2331 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
2332 | { |
2333 | struct lttng_kernel_event uevent_param; | |
2334 | ||
2335 | if (copy_from_user(&uevent_param, | |
2336 | (struct lttng_kernel_event __user *) arg, | |
2337 | sizeof(uevent_param))) | |
2338 | return -EFAULT; | |
2339 | return lttng_abi_create_event(file, &uevent_param); | |
2340 | } | |
2341 | case LTTNG_KERNEL_OLD_CONTEXT: | |
2342 | { | |
2343 | struct lttng_kernel_context *ucontext_param; | |
2344 | struct lttng_kernel_old_context *old_ucontext_param; | |
2345 | int ret; | |
2346 | ||
2347 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
2348 | GFP_KERNEL); | |
2349 | if (!ucontext_param) { | |
2350 | ret = -ENOMEM; | |
2351 | goto old_ctx_end; | |
2352 | } | |
2353 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
2354 | GFP_KERNEL); | |
2355 | if (!old_ucontext_param) { | |
2356 | ret = -ENOMEM; | |
2357 | goto old_ctx_error_free_param; | |
2358 | } | |
2359 | ||
2360 | if (copy_from_user(old_ucontext_param, | |
2361 | (struct lttng_kernel_old_context __user *) arg, | |
2362 | sizeof(struct lttng_kernel_old_context))) { | |
2363 | ret = -EFAULT; | |
2364 | goto old_ctx_error_free_old_param; | |
2365 | } | |
2366 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2367 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2368 | sizeof(ucontext_param->padding)); | |
2369 | /* only type that uses the union */ | |
2370 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
2371 | ucontext_param->u.perf_counter.type = | |
2372 | old_ucontext_param->u.perf_counter.type; | |
2373 | ucontext_param->u.perf_counter.config = | |
2374 | old_ucontext_param->u.perf_counter.config; | |
2375 | memcpy(ucontext_param->u.perf_counter.name, | |
2376 | old_ucontext_param->u.perf_counter.name, | |
2377 | sizeof(ucontext_param->u.perf_counter.name)); | |
2378 | } | |
2379 | ||
2380 | ret = lttng_abi_add_context(file, | |
2381 | ucontext_param, | |
2382 | &channel->ctx, channel->session); | |
2383 | ||
2384 | old_ctx_error_free_old_param: | |
2385 | kfree(old_ucontext_param); | |
2386 | old_ctx_error_free_param: | |
2387 | kfree(ucontext_param); | |
2388 | old_ctx_end: | |
2389 | return ret; | |
2390 | } | |
8070f5c0 | 2391 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
2392 | { |
2393 | struct lttng_kernel_context ucontext_param; | |
2394 | ||
2395 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 2396 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
2397 | sizeof(ucontext_param))) |
2398 | return -EFAULT; | |
2399 | return lttng_abi_add_context(file, | |
2400 | &ucontext_param, | |
8070f5c0 | 2401 | &channel->ctx, channel->session); |
6dccd6c1 JD |
2402 | } |
2403 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2404 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 2405 | return lttng_channel_enable(channel); |
6dccd6c1 | 2406 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2407 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 2408 | return lttng_channel_disable(channel); |
12e579db MD |
2409 | case LTTNG_KERNEL_SYSCALL_MASK: |
2410 | return lttng_channel_syscall_mask(channel, | |
2411 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
2412 | default: |
2413 | return -ENOIOCTLCMD; | |
2414 | } | |
2415 | } | |
2416 | ||
5dbbdb43 MD |
2417 | /** |
2418 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2419 | * | |
2420 | * @file: the file | |
2421 | * @cmd: the command | |
2422 | * @arg: command arg | |
2423 | * | |
2424 | * This ioctl implements lttng commands: | |
38d024ae | 2425 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
2426 | * Returns an event stream file descriptor or failure. |
2427 | * | |
2428 | * Channel and event file descriptors also hold a reference on the session. | |
2429 | */ | |
2430 | static | |
2431 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2432 | { | |
2433 | switch (cmd) { | |
6dccd6c1 | 2434 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2435 | case LTTNG_KERNEL_STREAM: |
d83004aa | 2436 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2437 | default: |
2438 | return -ENOIOCTLCMD; | |
2439 | } | |
2440 | } | |
2441 | ||
653fe716 MD |
2442 | /** |
2443 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2444 | * | |
c0e31d2e | 2445 | * @file: the file |
653fe716 MD |
2446 | * @wait: poll table |
2447 | */ | |
c0e31d2e | 2448 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2449 | { |
a90917c3 | 2450 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2451 | unsigned int mask = 0; |
2452 | ||
c0e31d2e | 2453 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2454 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2455 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2456 | wait); | |
653fe716 | 2457 | |
254ec7bc MD |
2458 | if (channel->ops->is_disabled(channel->chan)) |
2459 | return POLLERR; | |
24cedcfe | 2460 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2461 | return POLLHUP; |
f71ecafa | 2462 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2463 | return POLLIN | POLLRDNORM; |
f71ecafa | 2464 | return 0; |
653fe716 MD |
2465 | } |
2466 | return mask; | |
2467 | ||
2468 | } | |
2469 | ||
0a84a57f MD |
2470 | static |
2471 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2472 | { | |
a90917c3 | 2473 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
2474 | |
2475 | if (channel) | |
2476 | fput(channel->session->file); | |
0a84a57f MD |
2477 | return 0; |
2478 | } | |
2479 | ||
d83004aa JD |
2480 | static |
2481 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2482 | { | |
2483 | struct lttng_channel *channel = file->private_data; | |
2484 | ||
2485 | if (channel) { | |
d83004aa | 2486 | fput(channel->session->file); |
a3381417 | 2487 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2488 | } |
2489 | ||
2490 | return 0; | |
2491 | } | |
2492 | ||
ad1c05e1 | 2493 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2494 | .owner = THIS_MODULE, |
03037b98 | 2495 | .release = lttng_channel_release, |
653fe716 | 2496 | .poll = lttng_channel_poll, |
ad1c05e1 | 2497 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2498 | #ifdef CONFIG_COMPAT |
03037b98 | 2499 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2500 | #endif |
11b5a3c2 | 2501 | }; |
baf20995 | 2502 | |
5dbbdb43 | 2503 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2504 | .owner = THIS_MODULE, |
d83004aa | 2505 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2506 | .unlocked_ioctl = lttng_metadata_ioctl, |
2507 | #ifdef CONFIG_COMPAT | |
2508 | .compat_ioctl = lttng_metadata_ioctl, | |
2509 | #endif | |
2510 | }; | |
2511 | ||
8070f5c0 MD |
2512 | /** |
2513 | * lttng_event_ioctl - lttng syscall through ioctl | |
2514 | * | |
2515 | * @file: the file | |
2516 | * @cmd: the command | |
2517 | * @arg: command arg | |
2518 | * | |
2519 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
2520 | * LTTNG_KERNEL_CONTEXT |
2521 | * Prepend a context field to each record of this event | |
e64957da MD |
2522 | * LTTNG_KERNEL_ENABLE |
2523 | * Enable recording for this event (weak enable) | |
2524 | * LTTNG_KERNEL_DISABLE | |
2525 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
2526 | */ |
2527 | static | |
2528 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2529 | { | |
3c997079 | 2530 | struct lttng_event *event; |
b2bc0bc8 | 2531 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2532 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
2533 | |
2534 | switch (cmd) { | |
6dccd6c1 JD |
2535 | case LTTNG_KERNEL_OLD_CONTEXT: |
2536 | { | |
3c997079 MD |
2537 | /* Not implemented */ |
2538 | return -ENOSYS; | |
6dccd6c1 | 2539 | } |
8070f5c0 | 2540 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 2541 | { |
3c997079 MD |
2542 | /* Not implemented */ |
2543 | return -ENOSYS; | |
6dccd6c1 JD |
2544 | } |
2545 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2546 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
2547 | switch (*evtype) { |
2548 | case LTTNG_TYPE_EVENT: | |
2549 | event = file->private_data; | |
2550 | return lttng_event_enable(event); | |
2551 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2552 | event_enabler = file->private_data; |
2553 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
2554 | default: |
2555 | WARN_ON_ONCE(1); | |
2556 | return -ENOSYS; | |
2557 | } | |
6dccd6c1 | 2558 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2559 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
2560 | switch (*evtype) { |
2561 | case LTTNG_TYPE_EVENT: | |
2562 | event = file->private_data; | |
2563 | return lttng_event_disable(event); | |
2564 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2565 | event_enabler = file->private_data; |
2566 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
2567 | default: |
2568 | WARN_ON_ONCE(1); | |
2569 | return -ENOSYS; | |
2570 | } | |
07dfc1d0 MD |
2571 | case LTTNG_KERNEL_FILTER: |
2572 | switch (*evtype) { | |
2573 | case LTTNG_TYPE_EVENT: | |
2574 | return -EINVAL; | |
2575 | case LTTNG_TYPE_ENABLER: | |
2576 | { | |
b2bc0bc8 | 2577 | event_enabler = file->private_data; |
183e8b3a FD |
2578 | return lttng_event_enabler_attach_filter_bytecode( |
2579 | event_enabler, | |
07dfc1d0 MD |
2580 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2581 | } | |
0586316f MD |
2582 | default: |
2583 | WARN_ON_ONCE(1); | |
2584 | return -ENOSYS; | |
07dfc1d0 | 2585 | } |
3aed4dca FD |
2586 | case LTTNG_KERNEL_ADD_CALLSITE: |
2587 | switch (*evtype) { | |
2588 | case LTTNG_TYPE_EVENT: | |
2589 | event = file->private_data; | |
2590 | return lttng_event_add_callsite(event, | |
2591 | (struct lttng_kernel_event_callsite __user *) arg); | |
2592 | case LTTNG_TYPE_ENABLER: | |
2593 | return -EINVAL; | |
64c147c0 MD |
2594 | default: |
2595 | WARN_ON_ONCE(1); | |
2596 | return -ENOSYS; | |
3aed4dca | 2597 | } |
8070f5c0 MD |
2598 | default: |
2599 | return -ENOIOCTLCMD; | |
2600 | } | |
2601 | } | |
2602 | ||
0a84a57f MD |
2603 | static |
2604 | int lttng_event_release(struct inode *inode, struct file *file) | |
2605 | { | |
3c997079 | 2606 | struct lttng_event *event; |
b2bc0bc8 | 2607 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2608 | enum lttng_event_type *evtype = file->private_data; |
2609 | ||
2610 | if (!evtype) | |
2611 | return 0; | |
2612 | ||
2613 | switch (*evtype) { | |
2614 | case LTTNG_TYPE_EVENT: | |
2615 | event = file->private_data; | |
2616 | if (event) | |
2617 | fput(event->chan->file); | |
2618 | break; | |
2619 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2620 | event_enabler = file->private_data; |
2621 | if (event_enabler) | |
2622 | fput(event_enabler->chan->file); | |
3c997079 MD |
2623 | break; |
2624 | default: | |
2625 | WARN_ON_ONCE(1); | |
2626 | break; | |
2627 | } | |
c269fff4 | 2628 | |
0a84a57f MD |
2629 | return 0; |
2630 | } | |
2631 | ||
3b923e5b | 2632 | /* TODO: filter control ioctl */ |
0a84a57f | 2633 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 2634 | .owner = THIS_MODULE, |
0a84a57f | 2635 | .release = lttng_event_release, |
8070f5c0 MD |
2636 | .unlocked_ioctl = lttng_event_ioctl, |
2637 | #ifdef CONFIG_COMPAT | |
2638 | .compat_ioctl = lttng_event_ioctl, | |
2639 | #endif | |
11b5a3c2 | 2640 | }; |
0a84a57f | 2641 | |
3b731ab1 JD |
2642 | static int put_u64(uint64_t val, unsigned long arg) |
2643 | { | |
2644 | return put_user(val, (uint64_t __user *) arg); | |
2645 | } | |
2646 | ||
8b97fd42 MD |
2647 | static int put_u32(uint32_t val, unsigned long arg) |
2648 | { | |
2649 | return put_user(val, (uint32_t __user *) arg); | |
2650 | } | |
2651 | ||
ed8d02d6 JD |
2652 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2653 | unsigned int cmd, unsigned long arg) | |
2654 | { | |
3b731ab1 JD |
2655 | struct lib_ring_buffer *buf = filp->private_data; |
2656 | struct channel *chan = buf->backend.chan; | |
2657 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2658 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2659 | int ret; |
2660 | ||
2661 | if (atomic_read(&chan->record_disabled)) | |
2662 | return -EIO; | |
2663 | ||
ed8d02d6 | 2664 | switch (cmd) { |
3b731ab1 JD |
2665 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
2666 | { | |
2667 | uint64_t ts; | |
2668 | ||
dd5a0db3 | 2669 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2670 | if (ret < 0) |
2671 | goto error; | |
2672 | return put_u64(ts, arg); | |
2673 | } | |
2674 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
2675 | { | |
2676 | uint64_t ts; | |
2677 | ||
dd5a0db3 | 2678 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2679 | if (ret < 0) |
2680 | goto error; | |
2681 | return put_u64(ts, arg); | |
2682 | } | |
2683 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
2684 | { | |
2685 | uint64_t ed; | |
2686 | ||
dd5a0db3 | 2687 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2688 | if (ret < 0) |
2689 | goto error; | |
2690 | return put_u64(ed, arg); | |
2691 | } | |
2692 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
2693 | { | |
2694 | uint64_t cs; | |
2695 | ||
dd5a0db3 | 2696 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2697 | if (ret < 0) |
2698 | goto error; | |
2699 | return put_u64(cs, arg); | |
2700 | } | |
2701 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
2702 | { | |
2703 | uint64_t ps; | |
2704 | ||
dd5a0db3 | 2705 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2706 | if (ret < 0) |
2707 | goto error; | |
2708 | return put_u64(ps, arg); | |
2709 | } | |
2710 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
2711 | { | |
2712 | uint64_t si; | |
2713 | ||
dd5a0db3 | 2714 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2715 | if (ret < 0) |
2716 | goto error; | |
2717 | return put_u64(si, arg); | |
2718 | } | |
2348ca17 JD |
2719 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2720 | { | |
2721 | uint64_t ts; | |
2722 | ||
dd5a0db3 | 2723 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2724 | if (ret < 0) |
2725 | goto error; | |
2726 | return put_u64(ts, arg); | |
2727 | } | |
5b3cf4f9 JD |
2728 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
2729 | { | |
2730 | uint64_t seq; | |
2731 | ||
2732 | ret = ops->sequence_number(config, buf, &seq); | |
2733 | if (ret < 0) | |
2734 | goto error; | |
2735 | return put_u64(seq, arg); | |
2736 | } | |
5594698f JD |
2737 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
2738 | { | |
2739 | uint64_t id; | |
2740 | ||
2741 | ret = ops->instance_id(config, buf, &id); | |
2742 | if (ret < 0) | |
2743 | goto error; | |
2744 | return put_u64(id, arg); | |
2745 | } | |
3b731ab1 JD |
2746 | default: |
2747 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2748 | cmd, arg); | |
ed8d02d6 | 2749 | } |
3b731ab1 JD |
2750 | |
2751 | error: | |
2752 | return -ENOSYS; | |
ed8d02d6 JD |
2753 | } |
2754 | ||
2755 | #ifdef CONFIG_COMPAT | |
2756 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2757 | unsigned int cmd, unsigned long arg) | |
2758 | { | |
3b731ab1 JD |
2759 | struct lib_ring_buffer *buf = filp->private_data; |
2760 | struct channel *chan = buf->backend.chan; | |
2761 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2762 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2763 | int ret; |
2764 | ||
2765 | if (atomic_read(&chan->record_disabled)) | |
2766 | return -EIO; | |
2767 | ||
ed8d02d6 | 2768 | switch (cmd) { |
3b731ab1 JD |
2769 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2770 | { | |
2771 | uint64_t ts; | |
2772 | ||
dd5a0db3 | 2773 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2774 | if (ret < 0) |
2775 | goto error; | |
2776 | return put_u64(ts, arg); | |
2777 | } | |
2778 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
2779 | { | |
2780 | uint64_t ts; | |
2781 | ||
dd5a0db3 | 2782 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2783 | if (ret < 0) |
2784 | goto error; | |
2785 | return put_u64(ts, arg); | |
2786 | } | |
2787 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
2788 | { | |
2789 | uint64_t ed; | |
2790 | ||
dd5a0db3 | 2791 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2792 | if (ret < 0) |
2793 | goto error; | |
2794 | return put_u64(ed, arg); | |
ed8d02d6 | 2795 | } |
3b731ab1 JD |
2796 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
2797 | { | |
2798 | uint64_t cs; | |
2799 | ||
dd5a0db3 | 2800 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2801 | if (ret < 0) |
2802 | goto error; | |
2803 | return put_u64(cs, arg); | |
2804 | } | |
2805 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
2806 | { | |
2807 | uint64_t ps; | |
2808 | ||
dd5a0db3 | 2809 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2810 | if (ret < 0) |
2811 | goto error; | |
2812 | return put_u64(ps, arg); | |
2813 | } | |
2814 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
2815 | { | |
2816 | uint64_t si; | |
2817 | ||
dd5a0db3 | 2818 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2819 | if (ret < 0) |
2820 | goto error; | |
2821 | return put_u64(si, arg); | |
2822 | } | |
2348ca17 JD |
2823 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2824 | { | |
2825 | uint64_t ts; | |
2826 | ||
dd5a0db3 | 2827 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2828 | if (ret < 0) |
2829 | goto error; | |
2830 | return put_u64(ts, arg); | |
2831 | } | |
5b3cf4f9 JD |
2832 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2833 | { | |
2834 | uint64_t seq; | |
2835 | ||
2836 | ret = ops->sequence_number(config, buf, &seq); | |
2837 | if (ret < 0) | |
2838 | goto error; | |
2839 | return put_u64(seq, arg); | |
2840 | } | |
5594698f JD |
2841 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2842 | { | |
2843 | uint64_t id; | |
2844 | ||
2845 | ret = ops->instance_id(config, buf, &id); | |
2846 | if (ret < 0) | |
2847 | goto error; | |
2848 | return put_u64(id, arg); | |
2849 | } | |
3b731ab1 JD |
2850 | default: |
2851 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2852 | cmd, arg); | |
2853 | } | |
2854 | ||
2855 | error: | |
2856 | return -ENOSYS; | |
ed8d02d6 JD |
2857 | } |
2858 | #endif /* CONFIG_COMPAT */ | |
2859 | ||
2860 | static void lttng_stream_override_ring_buffer_fops(void) | |
2861 | { | |
2862 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2863 | lttng_stream_ring_buffer_file_operations.open = | |
2864 | lib_ring_buffer_file_operations.open; | |
2865 | lttng_stream_ring_buffer_file_operations.release = | |
2866 | lib_ring_buffer_file_operations.release; | |
2867 | lttng_stream_ring_buffer_file_operations.poll = | |
2868 | lib_ring_buffer_file_operations.poll; | |
2869 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2870 | lib_ring_buffer_file_operations.splice_read; | |
2871 | lttng_stream_ring_buffer_file_operations.mmap = | |
2872 | lib_ring_buffer_file_operations.mmap; | |
2873 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2874 | lttng_stream_ring_buffer_ioctl; | |
2875 | lttng_stream_ring_buffer_file_operations.llseek = | |
2876 | lib_ring_buffer_file_operations.llseek; | |
2877 | #ifdef CONFIG_COMPAT | |
2878 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2879 | lttng_stream_ring_buffer_compat_ioctl; | |
2880 | #endif | |
2881 | } | |
2882 | ||
80996790 | 2883 | int __init lttng_abi_init(void) |
baf20995 MD |
2884 | { |
2885 | int ret = 0; | |
2886 | ||
263b6c88 | 2887 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2888 | lttng_clock_ref(); |
f771eda6 JD |
2889 | |
2890 | ret = lttng_tp_mempool_init(); | |
2891 | if (ret) { | |
2892 | goto error; | |
2893 | } | |
2894 | ||
d29348f7 | 2895 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2896 | <tng_proc_ops, NULL); |
2470a237 | 2897 | |
255e52a4 | 2898 | if (!lttng_proc_dentry) { |
5a15f70c | 2899 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
2900 | ret = -ENOMEM; |
2901 | goto error; | |
2902 | } | |
ed8d02d6 | 2903 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2904 | return 0; |
ed8d02d6 | 2905 | |
baf20995 | 2906 | error: |
f771eda6 | 2907 | lttng_tp_mempool_destroy(); |
2754583e | 2908 | lttng_clock_unref(); |
baf20995 MD |
2909 | return ret; |
2910 | } | |
2911 | ||
e6e65fcd MD |
2912 | /* No __exit annotation because used by init error path too. */ |
2913 | void lttng_abi_exit(void) | |
baf20995 | 2914 | { |
f771eda6 | 2915 | lttng_tp_mempool_destroy(); |
2754583e | 2916 | lttng_clock_unref(); |
e6a17f26 MD |
2917 | if (lttng_proc_dentry) |
2918 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2919 | } |