Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
e8951e63 | 3 | * lttng-abi.c |
baf20995 | 4 | * |
e8951e63 | 5 | * LTTng ABI |
baf20995 | 6 | * |
886d51a3 MD |
7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8 | * | |
baf20995 MD |
9 | * Mimic system calls for: |
10 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
11 | * - channel creation, returns a file descriptor or failure. |
12 | * - Operates on a session file descriptor | |
13 | * - Takes all channel options as parameters. | |
14 | * - stream get, returns a file descriptor or failure. | |
15 | * - Operates on a channel file descriptor. | |
16 | * - stream notifier get, returns a file descriptor or failure. | |
17 | * - Operates on a channel file descriptor. | |
18 | * - event creation, returns a file descriptor or failure. | |
19 | * - Operates on a channel file descriptor | |
20 | * - Takes an event name as parameter | |
21 | * - Takes an instrumentation source as parameter | |
22 | * - e.g. tracepoints, dynamic_probes... | |
23 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
24 | */ |
25 | ||
11b5a3c2 | 26 | #include <linux/module.h> |
e6a17f26 | 27 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/slab.h> | |
abc0446a | 32 | #include <linux/err.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
24591303 MD |
34 | #include <ringbuffer/vfs.h> |
35 | #include <ringbuffer/backend.h> | |
36 | #include <ringbuffer/frontend.h> | |
241ae9a8 MD |
37 | #include <wrapper/poll.h> |
38 | #include <wrapper/file.h> | |
39 | #include <wrapper/kref.h> | |
2df37e95 MD |
40 | #include <lttng/string-utils.h> |
41 | #include <lttng/abi.h> | |
42 | #include <lttng/abi-old.h> | |
43 | #include <lttng/events.h> | |
44 | #include <lttng/tracer.h> | |
45 | #include <lttng/tp-mempool.h> | |
24591303 | 46 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 47 | #include <ringbuffer/iterator.h> |
baf20995 MD |
48 | |
49 | /* | |
50 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 51 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
52 | */ |
53 | ||
e6a17f26 | 54 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
55 | |
56 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
57 | static const struct proc_ops lttng_proc_ops; | |
58 | #else | |
59 | static const struct file_operations lttng_proc_ops; | |
60 | #endif | |
61 | ||
ad1c05e1 | 62 | static const struct file_operations lttng_session_fops; |
750b05f2 | 63 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 64 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 65 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 66 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 67 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 68 | |
9616f0bf | 69 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 70 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 71 | |
a33c9927 MD |
72 | /* |
73 | * Teardown management: opened file descriptors keep a refcount on the module, | |
74 | * so it can only exit when all file descriptors are closed. | |
75 | */ | |
76 | ||
ad1c05e1 | 77 | static |
baf20995 MD |
78 | int lttng_abi_create_session(void) |
79 | { | |
a90917c3 | 80 | struct lttng_session *session; |
c0e31d2e | 81 | struct file *session_file; |
11b5a3c2 | 82 | int session_fd, ret; |
baf20995 | 83 | |
a90917c3 | 84 | session = lttng_session_create(); |
baf20995 MD |
85 | if (!session) |
86 | return -ENOMEM; | |
4ac10b76 | 87 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
88 | if (session_fd < 0) { |
89 | ret = session_fd; | |
90 | goto fd_error; | |
91 | } | |
c0e31d2e | 92 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 93 | <tng_session_fops, |
baf20995 | 94 | session, O_RDWR); |
c0e31d2e MD |
95 | if (IS_ERR(session_file)) { |
96 | ret = PTR_ERR(session_file); | |
baf20995 MD |
97 | goto file_error; |
98 | } | |
c0e31d2e MD |
99 | session->file = session_file; |
100 | fd_install(session_fd, session_file); | |
baf20995 MD |
101 | return session_fd; |
102 | ||
103 | file_error: | |
104 | put_unused_fd(session_fd); | |
105 | fd_error: | |
a90917c3 | 106 | lttng_session_destroy(session); |
baf20995 MD |
107 | return ret; |
108 | } | |
109 | ||
21f58fb7 FD |
110 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
111 | { | |
112 | struct lttng_event_notifier_group *event_notifier_group = | |
113 | container_of(entry, struct lttng_event_notifier_group, | |
114 | wakeup_pending); | |
115 | wake_up_interruptible(&event_notifier_group->read_wait); | |
116 | } | |
117 | ||
750b05f2 FD |
118 | static |
119 | int lttng_abi_create_event_notifier_group(void) | |
120 | { | |
121 | struct lttng_event_notifier_group *event_notifier_group; | |
122 | struct file *event_notifier_group_file; | |
123 | int event_notifier_group_fd, ret; | |
124 | ||
125 | event_notifier_group = lttng_event_notifier_group_create(); | |
126 | if (!event_notifier_group) | |
127 | return -ENOMEM; | |
128 | ||
129 | event_notifier_group_fd = lttng_get_unused_fd(); | |
130 | if (event_notifier_group_fd < 0) { | |
131 | ret = event_notifier_group_fd; | |
132 | goto fd_error; | |
133 | } | |
134 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
135 | <tng_event_notifier_group_fops, | |
136 | event_notifier_group, O_RDWR); | |
137 | if (IS_ERR(event_notifier_group_file)) { | |
138 | ret = PTR_ERR(event_notifier_group_file); | |
139 | goto file_error; | |
140 | } | |
141 | ||
142 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
143 | init_waitqueue_head(&event_notifier_group->read_wait); |
144 | init_irq_work(&event_notifier_group->wakeup_pending, | |
145 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
146 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
147 | return event_notifier_group_fd; | |
148 | ||
149 | file_error: | |
150 | put_unused_fd(event_notifier_group_fd); | |
151 | fd_error: | |
152 | lttng_event_notifier_group_destroy(event_notifier_group); | |
153 | return ret; | |
154 | } | |
155 | ||
271b6681 MD |
156 | static |
157 | int lttng_abi_tracepoint_list(void) | |
158 | { | |
159 | struct file *tracepoint_list_file; | |
160 | int file_fd, ret; | |
161 | ||
4ac10b76 | 162 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
163 | if (file_fd < 0) { |
164 | ret = file_fd; | |
165 | goto fd_error; | |
166 | } | |
30f18bf0 | 167 | |
8ee099b6 | 168 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
169 | <tng_tracepoint_list_fops, |
170 | NULL, O_RDWR); | |
171 | if (IS_ERR(tracepoint_list_file)) { | |
172 | ret = PTR_ERR(tracepoint_list_file); | |
173 | goto file_error; | |
174 | } | |
30f18bf0 MD |
175 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
176 | if (ret < 0) | |
177 | goto open_error; | |
271b6681 MD |
178 | fd_install(file_fd, tracepoint_list_file); |
179 | return file_fd; | |
180 | ||
30f18bf0 MD |
181 | open_error: |
182 | fput(tracepoint_list_file); | |
271b6681 MD |
183 | file_error: |
184 | put_unused_fd(file_fd); | |
185 | fd_error: | |
186 | return ret; | |
187 | } | |
188 | ||
f127e61e MD |
189 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
190 | static inline | |
191 | int lttng_abi_syscall_list(void) | |
192 | { | |
193 | return -ENOSYS; | |
194 | } | |
195 | #else | |
196 | static | |
197 | int lttng_abi_syscall_list(void) | |
198 | { | |
199 | struct file *syscall_list_file; | |
200 | int file_fd, ret; | |
201 | ||
202 | file_fd = lttng_get_unused_fd(); | |
203 | if (file_fd < 0) { | |
204 | ret = file_fd; | |
205 | goto fd_error; | |
206 | } | |
207 | ||
208 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
209 | <tng_syscall_list_fops, | |
210 | NULL, O_RDWR); | |
211 | if (IS_ERR(syscall_list_file)) { | |
212 | ret = PTR_ERR(syscall_list_file); | |
213 | goto file_error; | |
214 | } | |
215 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
216 | if (ret < 0) | |
217 | goto open_error; | |
218 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
219 | return file_fd; |
220 | ||
221 | open_error: | |
222 | fput(syscall_list_file); | |
223 | file_error: | |
224 | put_unused_fd(file_fd); | |
225 | fd_error: | |
226 | return ret; | |
227 | } | |
228 | #endif | |
229 | ||
80c16bcf | 230 | static |
6dccd6c1 | 231 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 232 | { |
6dccd6c1 JD |
233 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
234 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
235 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
236 | } |
237 | ||
42cabb80 MD |
238 | static |
239 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
240 | { | |
241 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
242 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
243 | } | |
244 | ||
8070f5c0 MD |
245 | static |
246 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 247 | struct lttng_kernel_context *context_param, |
a90917c3 | 248 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 249 | { |
8070f5c0 MD |
250 | |
251 | if (session->been_active) | |
252 | return -EPERM; | |
253 | ||
6dccd6c1 | 254 | switch (context_param->ctx) { |
12a313a5 | 255 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 256 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
257 | case LTTNG_KERNEL_CONTEXT_PRIO: |
258 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
259 | case LTTNG_KERNEL_CONTEXT_NICE: |
260 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
261 | case LTTNG_KERNEL_CONTEXT_VPID: |
262 | return lttng_add_vpid_to_ctx(ctx); | |
263 | case LTTNG_KERNEL_CONTEXT_TID: | |
264 | return lttng_add_tid_to_ctx(ctx); | |
265 | case LTTNG_KERNEL_CONTEXT_VTID: | |
266 | return lttng_add_vtid_to_ctx(ctx); | |
267 | case LTTNG_KERNEL_CONTEXT_PPID: | |
268 | return lttng_add_ppid_to_ctx(ctx); | |
269 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
270 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 271 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
272 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
273 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
274 | context_param->u.perf_counter.config, | |
275 | context_param->u.perf_counter.name, | |
c24a0d71 | 276 | ctx); |
a2563e83 MD |
277 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
278 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
279 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
280 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
281 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
282 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
283 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
284 | return lttng_add_interruptible_to_ctx(ctx); | |
285 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
286 | return lttng_add_need_reschedule_to_ctx(ctx); | |
287 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
288 | return lttng_add_preemptible_to_ctx(ctx); | |
289 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
290 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
291 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
292 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
293 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
294 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
295 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
296 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
297 | return lttng_add_ipc_ns_to_ctx(ctx); | |
298 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
299 | return lttng_add_mnt_ns_to_ctx(ctx); | |
300 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
301 | return lttng_add_net_ns_to_ctx(ctx); | |
302 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
303 | return lttng_add_pid_ns_to_ctx(ctx); | |
304 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
305 | return lttng_add_user_ns_to_ctx(ctx); | |
306 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
307 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
308 | case LTTNG_KERNEL_CONTEXT_UID: |
309 | return lttng_add_uid_to_ctx(ctx); | |
310 | case LTTNG_KERNEL_CONTEXT_EUID: | |
311 | return lttng_add_euid_to_ctx(ctx); | |
312 | case LTTNG_KERNEL_CONTEXT_SUID: | |
313 | return lttng_add_suid_to_ctx(ctx); | |
314 | case LTTNG_KERNEL_CONTEXT_GID: | |
315 | return lttng_add_gid_to_ctx(ctx); | |
316 | case LTTNG_KERNEL_CONTEXT_EGID: | |
317 | return lttng_add_egid_to_ctx(ctx); | |
318 | case LTTNG_KERNEL_CONTEXT_SGID: | |
319 | return lttng_add_sgid_to_ctx(ctx); | |
320 | case LTTNG_KERNEL_CONTEXT_VUID: | |
321 | return lttng_add_vuid_to_ctx(ctx); | |
322 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
323 | return lttng_add_veuid_to_ctx(ctx); | |
324 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
325 | return lttng_add_vsuid_to_ctx(ctx); | |
326 | case LTTNG_KERNEL_CONTEXT_VGID: | |
327 | return lttng_add_vgid_to_ctx(ctx); | |
328 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
329 | return lttng_add_vegid_to_ctx(ctx); | |
330 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
331 | return lttng_add_vsgid_to_ctx(ctx); | |
876e2e92 MJ |
332 | case LTTNG_KERNEL_CONTEXT_TIME_NS: |
333 | return lttng_add_time_ns_to_ctx(ctx); | |
8070f5c0 MD |
334 | default: |
335 | return -EINVAL; | |
336 | } | |
337 | } | |
338 | ||
ad1c05e1 MD |
339 | /** |
340 | * lttng_ioctl - lttng syscall through ioctl | |
341 | * | |
c0e31d2e | 342 | * @file: the file |
ad1c05e1 MD |
343 | * @cmd: the command |
344 | * @arg: command arg | |
345 | * | |
346 | * This ioctl implements lttng commands: | |
38d024ae | 347 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 348 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
349 | * LTTNG_KERNEL_TRACER_VERSION |
350 | * Returns the LTTng kernel tracer version | |
351 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
352 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
353 | * LTTNG_KERNEL_WAIT_QUIESCENT |
354 | * Returns after all previously running probes have completed | |
42cabb80 MD |
355 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
356 | * Returns the LTTng kernel tracer ABI version | |
750b05f2 FD |
357 | * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE |
358 | * Returns a LTTng event notifier group file descriptor | |
ad1c05e1 MD |
359 | * |
360 | * The returned session will be deleted when its file descriptor is closed. | |
361 | */ | |
362 | static | |
c0e31d2e | 363 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
364 | { |
365 | switch (cmd) { | |
6dccd6c1 | 366 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 367 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 368 | return lttng_abi_create_session(); |
750b05f2 FD |
369 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE: |
370 | return lttng_abi_create_event_notifier_group(); | |
6dccd6c1 JD |
371 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
372 | { | |
373 | struct lttng_kernel_tracer_version v; | |
374 | struct lttng_kernel_old_tracer_version oldv; | |
375 | struct lttng_kernel_old_tracer_version *uversion = | |
376 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
377 | ||
378 | lttng_abi_tracer_version(&v); | |
379 | oldv.major = v.major; | |
380 | oldv.minor = v.minor; | |
381 | oldv.patchlevel = v.patchlevel; | |
382 | ||
383 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
384 | return -EFAULT; | |
385 | return 0; | |
386 | } | |
80c16bcf | 387 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
388 | { |
389 | struct lttng_kernel_tracer_version version; | |
390 | struct lttng_kernel_tracer_version *uversion = | |
391 | (struct lttng_kernel_tracer_version __user *) arg; | |
392 | ||
393 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
394 | |
395 | if (copy_to_user(uversion, &version, sizeof(version))) | |
396 | return -EFAULT; | |
397 | return 0; | |
398 | } | |
399 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
400 | { | |
401 | struct lttng_kernel_tracer_abi_version version; | |
402 | struct lttng_kernel_tracer_abi_version *uversion = | |
403 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
404 | ||
405 | lttng_abi_tracer_abi_version(&version); | |
406 | ||
6dccd6c1 JD |
407 | if (copy_to_user(uversion, &version, sizeof(version))) |
408 | return -EFAULT; | |
409 | return 0; | |
410 | } | |
411 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
412 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
413 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
414 | case LTTNG_KERNEL_SYSCALL_LIST: |
415 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 416 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
417 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
418 | synchronize_trace(); | |
419 | return 0; | |
6dccd6c1 JD |
420 | case LTTNG_KERNEL_OLD_CALIBRATE: |
421 | { | |
422 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
423 | (struct lttng_kernel_old_calibrate __user *) arg; | |
424 | struct lttng_kernel_old_calibrate old_calibrate; | |
425 | struct lttng_kernel_calibrate calibrate; | |
426 | int ret; | |
427 | ||
428 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
429 | return -EFAULT; | |
430 | calibrate.type = old_calibrate.type; | |
431 | ret = lttng_calibrate(&calibrate); | |
432 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
433 | return -EFAULT; | |
434 | return ret; | |
435 | } | |
57105fc2 MD |
436 | case LTTNG_KERNEL_CALIBRATE: |
437 | { | |
3db41b2c MD |
438 | struct lttng_kernel_calibrate __user *ucalibrate = |
439 | (struct lttng_kernel_calibrate __user *) arg; | |
440 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
441 | int ret; |
442 | ||
443 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
444 | return -EFAULT; | |
445 | ret = lttng_calibrate(&calibrate); | |
446 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
447 | return -EFAULT; | |
448 | return ret; | |
449 | } | |
ad1c05e1 MD |
450 | default: |
451 | return -ENOIOCTLCMD; | |
452 | } | |
453 | } | |
454 | ||
059de147 MJ |
455 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
456 | static const struct proc_ops lttng_proc_ops = { | |
457 | .proc_ioctl = lttng_ioctl, | |
458 | #ifdef CONFIG_COMPAT | |
459 | .proc_compat_ioctl = lttng_ioctl, | |
460 | #endif /* CONFIG_COMPAT */ | |
461 | }; | |
462 | #else | |
463 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 464 | .owner = THIS_MODULE, |
ad1c05e1 MD |
465 | .unlocked_ioctl = lttng_ioctl, |
466 | #ifdef CONFIG_COMPAT | |
03037b98 | 467 | .compat_ioctl = lttng_ioctl, |
059de147 | 468 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 469 | }; |
059de147 | 470 | #endif |
ad1c05e1 | 471 | |
5dbbdb43 | 472 | static |
c0e31d2e | 473 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 474 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 475 | enum channel_type channel_type) |
baf20995 | 476 | { |
a90917c3 | 477 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 478 | const struct file_operations *fops = NULL; |
5dbbdb43 | 479 | const char *transport_name; |
a90917c3 | 480 | struct lttng_channel *chan; |
c0e31d2e | 481 | struct file *chan_file; |
baf20995 | 482 | int chan_fd; |
ad1c05e1 | 483 | int ret = 0; |
baf20995 | 484 | |
4ac10b76 | 485 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
486 | if (chan_fd < 0) { |
487 | ret = chan_fd; | |
488 | goto fd_error; | |
489 | } | |
88dfd899 MD |
490 | switch (channel_type) { |
491 | case PER_CPU_CHANNEL: | |
492 | fops = <tng_channel_fops; | |
493 | break; | |
494 | case METADATA_CHANNEL: | |
495 | fops = <tng_metadata_fops; | |
496 | break; | |
497 | } | |
2470a237 | 498 | |
c0e31d2e | 499 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 500 | fops, |
03037b98 | 501 | NULL, O_RDWR); |
c0e31d2e MD |
502 | if (IS_ERR(chan_file)) { |
503 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
504 | goto file_error; |
505 | } | |
5dbbdb43 MD |
506 | switch (channel_type) { |
507 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
508 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
509 | transport_name = chan_param->overwrite ? | |
96ba7208 | 510 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
511 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
512 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
513 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
514 | } else { | |
515 | return -EINVAL; | |
516 | } | |
5dbbdb43 | 517 | break; |
5dbbdb43 | 518 | case METADATA_CHANNEL: |
6dccd6c1 | 519 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 520 | transport_name = "relay-metadata"; |
6dccd6c1 | 521 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
522 | transport_name = "relay-metadata-mmap"; |
523 | else | |
524 | return -EINVAL; | |
5dbbdb43 MD |
525 | break; |
526 | default: | |
527 | transport_name = "<unknown>"; | |
528 | break; | |
529 | } | |
98d7281c MJ |
530 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
531 | ret = -EOVERFLOW; | |
9c1f4643 MD |
532 | goto refcount_error; |
533 | } | |
03037b98 MD |
534 | /* |
535 | * We tolerate no failure path after channel creation. It will stay | |
536 | * invariant for the rest of the session. | |
537 | */ | |
a90917c3 | 538 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
539 | chan_param->subbuf_size, |
540 | chan_param->num_subbuf, | |
541 | chan_param->switch_timer_interval, | |
d83004aa JD |
542 | chan_param->read_timer_interval, |
543 | channel_type); | |
03037b98 | 544 | if (!chan) { |
f3d01b96 | 545 | ret = -EINVAL; |
03037b98 MD |
546 | goto chan_error; |
547 | } | |
11b5a3c2 | 548 | chan->file = chan_file; |
c0e31d2e MD |
549 | chan_file->private_data = chan; |
550 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 551 | |
baf20995 MD |
552 | return chan_fd; |
553 | ||
03037b98 | 554 | chan_error: |
9c1f4643 MD |
555 | atomic_long_dec(&session_file->f_count); |
556 | refcount_error: | |
c0e31d2e | 557 | fput(chan_file); |
baf20995 MD |
558 | file_error: |
559 | put_unused_fd(chan_fd); | |
560 | fd_error: | |
baf20995 MD |
561 | return ret; |
562 | } | |
563 | ||
7f859fbf JR |
564 | static |
565 | int lttng_abi_session_set_name(struct lttng_session *session, | |
566 | struct lttng_kernel_session_name *name) | |
567 | { | |
568 | size_t len; | |
569 | ||
570 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
571 | ||
572 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
573 | /* Name is too long/malformed */ | |
574 | return -EINVAL; | |
575 | } | |
576 | ||
577 | strcpy(session->name, name->name); | |
578 | return 0; | |
579 | } | |
580 | ||
1c88f269 JR |
581 | static |
582 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
583 | struct lttng_kernel_session_creation_time *time) | |
584 | { | |
585 | size_t len; | |
586 | ||
587 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
588 | ||
589 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
590 | /* Time is too long/malformed */ | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | strcpy(session->creation_time, time->iso8601); | |
595 | return 0; | |
596 | } | |
597 | ||
d1f652f8 MD |
598 | static |
599 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
600 | { | |
601 | switch (tracker->type) { | |
602 | case LTTNG_KERNEL_TRACKER_PID: | |
603 | return TRACKER_PID; | |
604 | case LTTNG_KERNEL_TRACKER_VPID: | |
605 | return TRACKER_VPID; | |
606 | case LTTNG_KERNEL_TRACKER_UID: | |
607 | return TRACKER_UID; | |
608 | case LTTNG_KERNEL_TRACKER_VUID: | |
609 | return TRACKER_VUID; | |
610 | case LTTNG_KERNEL_TRACKER_GID: | |
611 | return TRACKER_GID; | |
612 | case LTTNG_KERNEL_TRACKER_VGID: | |
613 | return TRACKER_VGID; | |
614 | default: | |
615 | return TRACKER_UNKNOWN; | |
616 | } | |
617 | } | |
618 | ||
baf20995 | 619 | /** |
ad1c05e1 | 620 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 621 | * |
c0e31d2e | 622 | * @file: the file |
baf20995 MD |
623 | * @cmd: the command |
624 | * @arg: command arg | |
625 | * | |
626 | * This ioctl implements lttng commands: | |
38d024ae | 627 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 628 | * Returns a LTTng channel file descriptor |
e64957da MD |
629 | * LTTNG_KERNEL_ENABLE |
630 | * Enables tracing for a session (weak enable) | |
631 | * LTTNG_KERNEL_DISABLE | |
632 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
633 | * LTTNG_KERNEL_METADATA |
634 | * Returns a LTTng metadata file descriptor | |
e0130fab | 635 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 636 | * Add PID to session PID tracker |
e0130fab | 637 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
638 | * Remove PID from session PID tracker |
639 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
640 | * Add ID to tracker | |
641 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
642 | * Remove ID from tracker | |
ad1c05e1 MD |
643 | * |
644 | * The returned channel will be deleted when its file descriptor is closed. | |
645 | */ | |
646 | static | |
c0e31d2e | 647 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 648 | { |
a90917c3 | 649 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
650 | struct lttng_kernel_channel chan_param; |
651 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 652 | |
ad1c05e1 | 653 | switch (cmd) { |
6dccd6c1 JD |
654 | case LTTNG_KERNEL_OLD_CHANNEL: |
655 | { | |
6dccd6c1 JD |
656 | if (copy_from_user(&old_chan_param, |
657 | (struct lttng_kernel_old_channel __user *) arg, | |
658 | sizeof(struct lttng_kernel_old_channel))) | |
659 | return -EFAULT; | |
660 | chan_param.overwrite = old_chan_param.overwrite; | |
661 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
662 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
663 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
664 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
665 | chan_param.output = old_chan_param.output; | |
666 | ||
667 | return lttng_abi_create_channel(file, &chan_param, | |
668 | PER_CPU_CHANNEL); | |
669 | } | |
38d024ae | 670 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 671 | { |
6dccd6c1 | 672 | if (copy_from_user(&chan_param, |
38d024ae | 673 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
674 | sizeof(struct lttng_kernel_channel))) |
675 | return -EFAULT; | |
676 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 677 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
678 | } |
679 | case LTTNG_KERNEL_OLD_SESSION_START: | |
680 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 681 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 682 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 683 | return lttng_session_enable(session); |
6dccd6c1 JD |
684 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
685 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 686 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 687 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 688 | return lttng_session_disable(session); |
6dccd6c1 JD |
689 | case LTTNG_KERNEL_OLD_METADATA: |
690 | { | |
6dccd6c1 JD |
691 | if (copy_from_user(&old_chan_param, |
692 | (struct lttng_kernel_old_channel __user *) arg, | |
693 | sizeof(struct lttng_kernel_old_channel))) | |
694 | return -EFAULT; | |
695 | chan_param.overwrite = old_chan_param.overwrite; | |
696 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
697 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
698 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
699 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
700 | chan_param.output = old_chan_param.output; | |
701 | ||
702 | return lttng_abi_create_channel(file, &chan_param, | |
703 | METADATA_CHANNEL); | |
704 | } | |
38d024ae | 705 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 706 | { |
6dccd6c1 JD |
707 | if (copy_from_user(&chan_param, |
708 | (struct lttng_kernel_channel __user *) arg, | |
709 | sizeof(struct lttng_kernel_channel))) | |
710 | return -EFAULT; | |
711 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 712 | METADATA_CHANNEL); |
6dccd6c1 | 713 | } |
e0130fab | 714 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 715 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 716 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
717 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
718 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
719 | { | |
720 | struct lttng_kernel_tracker_args tracker; | |
721 | enum tracker_type tracker_type; | |
722 | ||
723 | if (copy_from_user(&tracker, | |
724 | (struct lttng_kernel_tracker_args __user *) arg, | |
725 | sizeof(struct lttng_kernel_tracker_args))) | |
726 | return -EFAULT; | |
727 | tracker_type = get_tracker_type(&tracker); | |
728 | if (tracker_type == TRACKER_UNKNOWN) | |
729 | return -EINVAL; | |
730 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
731 | } | |
732 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
733 | { | |
734 | struct lttng_kernel_tracker_args tracker; | |
735 | enum tracker_type tracker_type; | |
736 | ||
737 | if (copy_from_user(&tracker, | |
738 | (struct lttng_kernel_tracker_args __user *) arg, | |
739 | sizeof(struct lttng_kernel_tracker_args))) | |
740 | return -EFAULT; | |
741 | tracker_type = get_tracker_type(&tracker); | |
742 | if (tracker_type == TRACKER_UNKNOWN) | |
743 | return -EINVAL; | |
744 | return lttng_session_untrack_id(session, tracker_type, | |
745 | tracker.id); | |
746 | } | |
7e6f9ef6 | 747 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
748 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
749 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
750 | { | |
751 | struct lttng_kernel_tracker_args tracker; | |
752 | enum tracker_type tracker_type; | |
753 | ||
754 | if (copy_from_user(&tracker, | |
755 | (struct lttng_kernel_tracker_args __user *) arg, | |
756 | sizeof(struct lttng_kernel_tracker_args))) | |
757 | return -EFAULT; | |
758 | tracker_type = get_tracker_type(&tracker); | |
759 | if (tracker_type == TRACKER_UNKNOWN) | |
760 | return -EINVAL; | |
761 | return lttng_session_list_tracker_ids(session, tracker_type); | |
762 | } | |
9616f0bf JD |
763 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
764 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
765 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
766 | return lttng_session_statedump(session); | |
7f859fbf JR |
767 | case LTTNG_KERNEL_SESSION_SET_NAME: |
768 | { | |
769 | struct lttng_kernel_session_name name; | |
770 | ||
771 | if (copy_from_user(&name, | |
772 | (struct lttng_kernel_session_name __user *) arg, | |
773 | sizeof(struct lttng_kernel_session_name))) | |
774 | return -EFAULT; | |
775 | return lttng_abi_session_set_name(session, &name); | |
776 | } | |
1c88f269 JR |
777 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
778 | { | |
779 | struct lttng_kernel_session_creation_time time; | |
780 | ||
781 | if (copy_from_user(&time, | |
782 | (struct lttng_kernel_session_creation_time __user *) arg, | |
783 | sizeof(struct lttng_kernel_session_creation_time))) | |
784 | return -EFAULT; | |
785 | return lttng_abi_session_set_creation_time(session, &time); | |
786 | } | |
ad1c05e1 MD |
787 | default: |
788 | return -ENOIOCTLCMD; | |
789 | } | |
790 | } | |
791 | ||
03037b98 MD |
792 | /* |
793 | * Called when the last file reference is dropped. | |
794 | * | |
795 | * Big fat note: channels and events are invariant for the whole session after | |
796 | * their creation. So this session destruction also destroys all channel and | |
797 | * event structures specific to this session (they are not destroyed when their | |
798 | * individual file is released). | |
799 | */ | |
ad1c05e1 | 800 | static |
03037b98 | 801 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 802 | { |
a90917c3 | 803 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
804 | |
805 | if (session) | |
a90917c3 | 806 | lttng_session_destroy(session); |
11b5a3c2 | 807 | return 0; |
ad1c05e1 | 808 | } |
ad1c05e1 MD |
809 | |
810 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 811 | .owner = THIS_MODULE, |
03037b98 | 812 | .release = lttng_session_release, |
ad1c05e1 MD |
813 | .unlocked_ioctl = lttng_session_ioctl, |
814 | #ifdef CONFIG_COMPAT | |
03037b98 | 815 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 816 | #endif |
11b5a3c2 | 817 | }; |
ad1c05e1 | 818 | |
db2511b4 MD |
819 | /* |
820 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
821 | * and retry (if new data available to read after flush). | |
822 | */ | |
823 | static | |
824 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
825 | size_t count, loff_t *ppos) | |
826 | { | |
827 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
828 | struct channel *chan = event_notifier_group->chan; | |
829 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
830 | ssize_t read_count = 0, len; | |
831 | size_t read_offset; | |
832 | ||
833 | might_sleep(); | |
834 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
835 | return -EFAULT; | |
836 | ||
837 | /* Finish copy of previous record */ | |
838 | if (*ppos != 0) { | |
839 | if (read_count < count) { | |
840 | len = chan->iter.len_left; | |
841 | read_offset = *ppos; | |
842 | goto skip_get_next; | |
843 | } | |
844 | } | |
845 | ||
846 | while (read_count < count) { | |
847 | size_t copy_len, space_left; | |
848 | ||
849 | len = lib_ring_buffer_get_next_record(chan, buf); | |
850 | len_test: | |
851 | if (len < 0) { | |
852 | /* | |
853 | * Check if buffer is finalized (end of file). | |
854 | */ | |
855 | if (len == -ENODATA) { | |
856 | /* A 0 read_count will tell about end of file */ | |
857 | goto nodata; | |
858 | } | |
859 | if (filp->f_flags & O_NONBLOCK) { | |
860 | if (!read_count) | |
861 | read_count = -EAGAIN; | |
862 | goto nodata; | |
863 | } else { | |
864 | int error; | |
865 | ||
866 | /* | |
867 | * No data available at the moment, return what | |
868 | * we got. | |
869 | */ | |
870 | if (read_count) | |
871 | goto nodata; | |
872 | ||
873 | /* | |
874 | * Wait for returned len to be >= 0 or -ENODATA. | |
875 | */ | |
876 | error = wait_event_interruptible( | |
877 | event_notifier_group->read_wait, | |
878 | ((len = lib_ring_buffer_get_next_record( | |
879 | chan, buf)), len != -EAGAIN)); | |
880 | CHAN_WARN_ON(chan, len == -EBUSY); | |
881 | if (error) { | |
882 | read_count = error; | |
883 | goto nodata; | |
884 | } | |
885 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
886 | goto len_test; | |
887 | } | |
888 | } | |
889 | read_offset = buf->iter.read_offset; | |
890 | skip_get_next: | |
891 | space_left = count - read_count; | |
892 | if (len <= space_left) { | |
893 | copy_len = len; | |
894 | chan->iter.len_left = 0; | |
895 | *ppos = 0; | |
896 | } else { | |
897 | copy_len = space_left; | |
898 | chan->iter.len_left = len - copy_len; | |
899 | *ppos = read_offset + copy_len; | |
900 | } | |
901 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
902 | &user_buf[read_count], | |
903 | copy_len)) { | |
904 | /* | |
905 | * Leave the len_left and ppos values at their current | |
906 | * state, as we currently have a valid event to read. | |
907 | */ | |
908 | return -EFAULT; | |
909 | } | |
910 | read_count += copy_len; | |
911 | } | |
912 | return read_count; | |
913 | ||
914 | nodata: | |
915 | *ppos = 0; | |
916 | chan->iter.len_left = 0; | |
917 | return read_count; | |
918 | } | |
919 | ||
920 | /* | |
921 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
922 | * there is data available. Perform a ring buffer flush if we encounter a | |
923 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
924 | */ | |
925 | static | |
926 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
927 | poll_table *wait) | |
928 | { | |
929 | unsigned int mask = 0; | |
930 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
931 | struct channel *chan = event_notifier_group->chan; | |
932 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
933 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
934 | int finalized, disabled; | |
935 | unsigned long consumed, offset; | |
18f12d55 | 936 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
937 | |
938 | if (filp->f_mode & FMODE_READ) { | |
939 | poll_wait_set_exclusive(wait); | |
940 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
941 | ||
942 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
943 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
944 | ||
945 | /* | |
946 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
947 | * finalized load before offsets loads. | |
948 | */ | |
949 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
950 | retry: | |
951 | if (disabled) | |
952 | return POLLERR; | |
953 | ||
954 | offset = lib_ring_buffer_get_offset(config, buf); | |
955 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
956 | ||
957 | /* | |
958 | * If there is no buffer available to consume. | |
959 | */ | |
960 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
961 | /* | |
962 | * If there is a non-empty subbuffer, flush and try again. | |
963 | */ | |
18f12d55 | 964 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
965 | lib_ring_buffer_switch_remote(buf); |
966 | goto retry; | |
967 | } | |
968 | ||
969 | if (finalized) | |
970 | return POLLHUP; | |
971 | else { | |
972 | /* | |
973 | * The memory barriers | |
974 | * __wait_event()/wake_up_interruptible() take | |
975 | * care of "raw_spin_is_locked" memory ordering. | |
976 | */ | |
977 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
978 | goto retry; | |
979 | else | |
980 | return 0; | |
981 | } | |
982 | } else { | |
983 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
984 | >= chan->backend.buf_size) | |
985 | return POLLPRI | POLLRDBAND; | |
986 | else | |
987 | return POLLIN | POLLRDNORM; | |
988 | } | |
989 | } | |
990 | ||
991 | return mask; | |
992 | } | |
993 | ||
994 | /** | |
995 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
996 | * @inode: opened inode | |
997 | * @file: opened file | |
998 | * | |
999 | * Open implementation. Makes sure only one open instance of a buffer is | |
1000 | * done at a given moment. | |
1001 | */ | |
1002 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1003 | { | |
1004 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
1005 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1006 | ||
1007 | file->private_data = event_notifier_group; | |
1008 | return lib_ring_buffer_open(inode, file, buf); | |
1009 | } | |
1010 | ||
1011 | /** | |
1012 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1013 | * @inode: opened inode | |
1014 | * @file: opened file | |
1015 | * | |
1016 | * Release implementation. | |
1017 | */ | |
1018 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1019 | { | |
1020 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
1021 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1022 | int ret; | |
1023 | ||
1024 | ret = lib_ring_buffer_release(inode, file, buf); | |
1025 | if (ret) | |
1026 | return ret; | |
1027 | fput(event_notifier_group->file); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
21f58fb7 FD |
1031 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1032 | .owner = THIS_MODULE, | |
db2511b4 MD |
1033 | .open = lttng_event_notifier_group_notif_open, |
1034 | .release = lttng_event_notifier_group_notif_release, | |
1035 | .read = lttng_event_notifier_group_notif_read, | |
1036 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1037 | }; |
1038 | ||
d83004aa JD |
1039 | /** |
1040 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1041 | * @filp: the file | |
1042 | * @wait: poll table | |
1043 | * | |
1044 | * Handles the poll operations for the metadata channels. | |
1045 | */ | |
ad1c05e1 | 1046 | static |
d83004aa JD |
1047 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1048 | poll_table *wait) | |
1049 | { | |
1050 | struct lttng_metadata_stream *stream = filp->private_data; | |
1051 | struct lib_ring_buffer *buf = stream->priv; | |
1052 | int finalized; | |
1053 | unsigned int mask = 0; | |
1054 | ||
1055 | if (filp->f_mode & FMODE_READ) { | |
1056 | poll_wait_set_exclusive(wait); | |
1057 | poll_wait(filp, &stream->read_wait, wait); | |
1058 | ||
1059 | finalized = stream->finalized; | |
1060 | ||
1061 | /* | |
1062 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1063 | * ordering finalized load before offsets loads. | |
1064 | */ | |
1065 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1066 | ||
1067 | if (finalized) | |
1068 | mask |= POLLHUP; | |
1069 | ||
92d9f5e6 | 1070 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1071 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1072 | stream->metadata_out) |
d83004aa | 1073 | mask |= POLLIN; |
92d9f5e6 | 1074 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1075 | } |
1076 | ||
1077 | return mask; | |
1078 | } | |
1079 | ||
f613e3e6 MD |
1080 | static |
1081 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1082 | unsigned int cmd, unsigned long arg) | |
1083 | { | |
1084 | struct lttng_metadata_stream *stream = filp->private_data; | |
1085 | ||
1086 | stream->metadata_out = stream->metadata_in; | |
1087 | } | |
1088 | ||
d1344afa JD |
1089 | /* |
1090 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1091 | * the consumer receives the content of the metadata cache unchanged. This is | |
1092 | * different from the metadata_regenerate where the offset from epoch is | |
1093 | * resampled, here we want the exact same content as the last time the metadata | |
1094 | * was generated. This command is only possible if all the metadata written | |
1095 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1096 | * metadata file. | |
1097 | * | |
1098 | * Return 0 on success, a negative value on error. | |
1099 | */ | |
1100 | static | |
1101 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1102 | { | |
1103 | int ret; | |
1104 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1105 | ||
1106 | mutex_lock(&cache->lock); | |
1107 | if (stream->metadata_out != cache->metadata_written) { | |
1108 | ret = -EBUSY; | |
1109 | goto end; | |
1110 | } | |
1111 | stream->metadata_out = 0; | |
1112 | stream->metadata_in = 0; | |
1113 | wake_up_interruptible(&stream->read_wait); | |
1114 | ret = 0; | |
1115 | ||
1116 | end: | |
1117 | mutex_unlock(&cache->lock); | |
1118 | return ret; | |
1119 | } | |
1120 | ||
d83004aa JD |
1121 | static |
1122 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1123 | unsigned int cmd, unsigned long arg) | |
1124 | { | |
1125 | int ret; | |
1126 | struct lttng_metadata_stream *stream = filp->private_data; | |
1127 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1128 | unsigned int rb_cmd; |
1129 | bool coherent; | |
1130 | ||
1131 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1132 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1133 | else | |
1134 | rb_cmd = cmd; | |
d83004aa JD |
1135 | |
1136 | switch (cmd) { | |
d83004aa JD |
1137 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1138 | { | |
35097f36 JD |
1139 | struct lttng_metadata_stream *stream = filp->private_data; |
1140 | struct lib_ring_buffer *buf = stream->priv; | |
1141 | struct channel *chan = buf->backend.chan; | |
1142 | ||
8b97fd42 | 1143 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1144 | if (ret > 0) { |
1145 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1146 | ret = 0; | |
1147 | } else if (ret < 0) | |
d83004aa JD |
1148 | goto err; |
1149 | break; | |
1150 | } | |
f613e3e6 MD |
1151 | case RING_BUFFER_GET_SUBBUF: |
1152 | { | |
1153 | /* | |
1154 | * Random access is not allowed for metadata channel. | |
1155 | */ | |
1156 | return -ENOSYS; | |
1157 | } | |
c6f05468 | 1158 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
1159 | case RING_BUFFER_FLUSH: |
1160 | { | |
1161 | struct lttng_metadata_stream *stream = filp->private_data; | |
1162 | struct lib_ring_buffer *buf = stream->priv; | |
1163 | struct channel *chan = buf->backend.chan; | |
1164 | ||
1165 | /* | |
1166 | * Before doing the actual ring buffer flush, write up to one | |
1167 | * packet of metadata in the ring buffer. | |
1168 | */ | |
8b97fd42 | 1169 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1170 | if (ret < 0) |
1171 | goto err; | |
1172 | break; | |
1173 | } | |
9616f0bf JD |
1174 | case RING_BUFFER_GET_METADATA_VERSION: |
1175 | { | |
1176 | struct lttng_metadata_stream *stream = filp->private_data; | |
1177 | ||
1178 | return put_u64(stream->version, arg); | |
1179 | } | |
d1344afa JD |
1180 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1181 | { | |
1182 | struct lttng_metadata_stream *stream = filp->private_data; | |
1183 | ||
1184 | return lttng_metadata_cache_dump(stream); | |
1185 | } | |
8b97fd42 MD |
1186 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1187 | { | |
1188 | struct lttng_metadata_stream *stream = filp->private_data; | |
1189 | struct lib_ring_buffer *buf = stream->priv; | |
1190 | struct channel *chan = buf->backend.chan; | |
1191 | ||
1192 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1193 | if (ret > 0) { | |
1194 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1195 | ret = 0; | |
1196 | } else if (ret < 0) { | |
1197 | goto err; | |
1198 | } | |
1199 | break; | |
1200 | } | |
d83004aa JD |
1201 | default: |
1202 | break; | |
1203 | } | |
f613e3e6 MD |
1204 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1205 | ||
d83004aa | 1206 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1207 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1208 | if (ret < 0) |
1209 | goto err; | |
d83004aa | 1210 | |
f613e3e6 MD |
1211 | switch (cmd) { |
1212 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1213 | { | |
1214 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1215 | cmd, arg); | |
1216 | break; | |
1217 | } | |
8b97fd42 MD |
1218 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1219 | { | |
1220 | return put_u32(coherent, arg); | |
1221 | } | |
f613e3e6 MD |
1222 | default: |
1223 | break; | |
1224 | } | |
d83004aa JD |
1225 | err: |
1226 | return ret; | |
1227 | } | |
1228 | ||
aeb9064d | 1229 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1230 | static |
1231 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1232 | unsigned int cmd, unsigned long arg) | |
1233 | { | |
1234 | int ret; | |
1235 | struct lttng_metadata_stream *stream = filp->private_data; | |
1236 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1237 | unsigned int rb_cmd; |
1238 | bool coherent; | |
1239 | ||
1240 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1241 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1242 | else | |
1243 | rb_cmd = cmd; | |
d83004aa JD |
1244 | |
1245 | switch (cmd) { | |
d83004aa JD |
1246 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1247 | { | |
35097f36 JD |
1248 | struct lttng_metadata_stream *stream = filp->private_data; |
1249 | struct lib_ring_buffer *buf = stream->priv; | |
1250 | struct channel *chan = buf->backend.chan; | |
1251 | ||
8b97fd42 | 1252 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1253 | if (ret > 0) { |
1254 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1255 | ret = 0; | |
1256 | } else if (ret < 0) | |
d83004aa JD |
1257 | goto err; |
1258 | break; | |
1259 | } | |
f613e3e6 MD |
1260 | case RING_BUFFER_GET_SUBBUF: |
1261 | { | |
1262 | /* | |
1263 | * Random access is not allowed for metadata channel. | |
1264 | */ | |
1265 | return -ENOSYS; | |
1266 | } | |
c6f05468 | 1267 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1268 | case RING_BUFFER_FLUSH: |
1269 | { | |
1270 | struct lttng_metadata_stream *stream = filp->private_data; | |
1271 | struct lib_ring_buffer *buf = stream->priv; | |
1272 | struct channel *chan = buf->backend.chan; | |
1273 | ||
1274 | /* | |
1275 | * Before doing the actual ring buffer flush, write up to one | |
1276 | * packet of metadata in the ring buffer. | |
1277 | */ | |
8b97fd42 | 1278 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1279 | if (ret < 0) |
1280 | goto err; | |
1281 | break; | |
1282 | } | |
1283 | case RING_BUFFER_GET_METADATA_VERSION: | |
1284 | { | |
1285 | struct lttng_metadata_stream *stream = filp->private_data; | |
1286 | ||
1287 | return put_u64(stream->version, arg); | |
1288 | } | |
d1344afa JD |
1289 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1290 | { | |
1291 | struct lttng_metadata_stream *stream = filp->private_data; | |
1292 | ||
1293 | return lttng_metadata_cache_dump(stream); | |
1294 | } | |
8b97fd42 MD |
1295 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1296 | { | |
1297 | struct lttng_metadata_stream *stream = filp->private_data; | |
1298 | struct lib_ring_buffer *buf = stream->priv; | |
1299 | struct channel *chan = buf->backend.chan; | |
1300 | ||
1301 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1302 | if (ret > 0) { | |
1303 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1304 | ret = 0; | |
1305 | } else if (ret < 0) { | |
1306 | goto err; | |
1307 | } | |
1308 | break; | |
1309 | } | |
d83004aa JD |
1310 | default: |
1311 | break; | |
1312 | } | |
f613e3e6 MD |
1313 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1314 | ||
d83004aa | 1315 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1316 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1317 | if (ret < 0) |
1318 | goto err; | |
d83004aa | 1319 | |
f613e3e6 MD |
1320 | switch (cmd) { |
1321 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1322 | { | |
1323 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1324 | cmd, arg); | |
1325 | break; | |
1326 | } | |
8b97fd42 MD |
1327 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1328 | { | |
1329 | return put_u32(coherent, arg); | |
1330 | } | |
f613e3e6 MD |
1331 | default: |
1332 | break; | |
1333 | } | |
d83004aa JD |
1334 | err: |
1335 | return ret; | |
1336 | } | |
aeb9064d | 1337 | #endif |
d83004aa | 1338 | |
b3b8072b MD |
1339 | /* |
1340 | * This is not used by anonymous file descriptors. This code is left | |
1341 | * there if we ever want to implement an inode with open() operation. | |
1342 | */ | |
d83004aa JD |
1343 | static |
1344 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1345 | { | |
1346 | struct lttng_metadata_stream *stream = inode->i_private; | |
1347 | struct lib_ring_buffer *buf = stream->priv; | |
1348 | ||
1349 | file->private_data = buf; | |
b3b8072b MD |
1350 | /* |
1351 | * Since life-time of metadata cache differs from that of | |
1352 | * session, we need to keep our own reference on the transport. | |
1353 | */ | |
1354 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1355 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1356 | return -EBUSY; |
1357 | } | |
d83004aa JD |
1358 | return lib_ring_buffer_open(inode, file, buf); |
1359 | } | |
1360 | ||
1361 | static | |
1362 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1363 | { | |
1364 | struct lttng_metadata_stream *stream = file->private_data; | |
1365 | struct lib_ring_buffer *buf = stream->priv; | |
1366 | ||
92143b2c MD |
1367 | mutex_lock(&stream->metadata_cache->lock); |
1368 | list_del(&stream->list); | |
1369 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1370 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1371 | module_put(stream->transport->owner); |
92143b2c | 1372 | kfree(stream); |
d83004aa JD |
1373 | return lib_ring_buffer_release(inode, file, buf); |
1374 | } | |
1375 | ||
1376 | static | |
1377 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1378 | struct pipe_inode_info *pipe, size_t len, | |
1379 | unsigned int flags) | |
1380 | { | |
1381 | struct lttng_metadata_stream *stream = in->private_data; | |
1382 | struct lib_ring_buffer *buf = stream->priv; | |
1383 | ||
1384 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1385 | flags, buf); | |
1386 | } | |
1387 | ||
1388 | static | |
1389 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1390 | struct vm_area_struct *vma) | |
1391 | { | |
1392 | struct lttng_metadata_stream *stream = filp->private_data; | |
1393 | struct lib_ring_buffer *buf = stream->priv; | |
1394 | ||
1395 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1396 | } | |
1397 | ||
1398 | static | |
1399 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1400 | .owner = THIS_MODULE, | |
1401 | .open = lttng_metadata_ring_buffer_open, | |
1402 | .release = lttng_metadata_ring_buffer_release, | |
1403 | .poll = lttng_metadata_ring_buffer_poll, | |
1404 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1405 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1406 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1407 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1408 | #ifdef CONFIG_COMPAT | |
1409 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1410 | #endif | |
1411 | }; | |
1412 | ||
1413 | static | |
1414 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1415 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1416 | { |
ad1c05e1 | 1417 | int stream_fd, ret; |
11b5a3c2 | 1418 | struct file *stream_file; |
ad1c05e1 | 1419 | |
4ac10b76 | 1420 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1421 | if (stream_fd < 0) { |
1422 | ret = stream_fd; | |
1423 | goto fd_error; | |
1424 | } | |
a3fcd499 | 1425 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1426 | if (IS_ERR(stream_file)) { |
1427 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1428 | goto file_error; |
1429 | } | |
409453cb MD |
1430 | /* |
1431 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1432 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1433 | * file descriptor, so we set FMODE_PREAD here. | |
1434 | */ | |
d7b6f197 | 1435 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1436 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1437 | /* |
1438 | * The stream holds a reference to the channel within the generic ring | |
1439 | * buffer library, so no need to hold a refcount on the channel and | |
1440 | * session files here. | |
1441 | */ | |
ad1c05e1 MD |
1442 | return stream_fd; |
1443 | ||
1444 | file_error: | |
1445 | put_unused_fd(stream_fd); | |
d83004aa JD |
1446 | fd_error: |
1447 | return ret; | |
1448 | } | |
1449 | ||
1450 | static | |
1451 | int lttng_abi_open_stream(struct file *channel_file) | |
1452 | { | |
1453 | struct lttng_channel *channel = channel_file->private_data; | |
1454 | struct lib_ring_buffer *buf; | |
1455 | int ret; | |
1456 | void *stream_priv; | |
1457 | ||
1458 | buf = channel->ops->buffer_read_open(channel->chan); | |
1459 | if (!buf) | |
1460 | return -ENOENT; | |
1461 | ||
1462 | stream_priv = buf; | |
1463 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1464 | <tng_stream_ring_buffer_file_operations, |
1465 | "[lttng_stream]"); | |
d83004aa JD |
1466 | if (ret < 0) |
1467 | goto fd_error; | |
1468 | ||
1469 | return ret; | |
1470 | ||
1471 | fd_error: | |
1472 | channel->ops->buffer_read_close(buf); | |
1473 | return ret; | |
1474 | } | |
1475 | ||
1476 | static | |
1477 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1478 | { | |
1479 | struct lttng_channel *channel = channel_file->private_data; | |
1480 | struct lttng_session *session = channel->session; | |
1481 | struct lib_ring_buffer *buf; | |
1482 | int ret; | |
1483 | struct lttng_metadata_stream *metadata_stream; | |
1484 | void *stream_priv; | |
1485 | ||
1486 | buf = channel->ops->buffer_read_open(channel->chan); | |
1487 | if (!buf) | |
1488 | return -ENOENT; | |
1489 | ||
1490 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1491 | GFP_KERNEL); | |
b3b8072b MD |
1492 | if (!metadata_stream) { |
1493 | ret = -ENOMEM; | |
1494 | goto nomem; | |
1495 | } | |
d83004aa JD |
1496 | metadata_stream->metadata_cache = session->metadata_cache; |
1497 | init_waitqueue_head(&metadata_stream->read_wait); | |
1498 | metadata_stream->priv = buf; | |
1499 | stream_priv = metadata_stream; | |
b3b8072b | 1500 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
1501 | /* Initial state is an empty metadata, considered as incoherent. */ |
1502 | metadata_stream->coherent = false; | |
b3b8072b MD |
1503 | |
1504 | /* | |
1505 | * Since life-time of metadata cache differs from that of | |
1506 | * session, we need to keep our own reference on the transport. | |
1507 | */ | |
1508 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1509 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1510 | ret = -EINVAL; |
1511 | goto notransport; | |
1512 | } | |
1513 | ||
901aaa5f FD |
1514 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1515 | ret = -EOVERFLOW; | |
9c1f4643 | 1516 | goto kref_error; |
901aaa5f FD |
1517 | } |
1518 | ||
d83004aa | 1519 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1520 | <tng_metadata_ring_buffer_file_operations, |
1521 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1522 | if (ret < 0) |
1523 | goto fd_error; | |
1524 | ||
92143b2c | 1525 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1526 | list_add(&metadata_stream->list, |
1527 | &session->metadata_cache->metadata_stream); | |
92143b2c | 1528 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1529 | return ret; |
1530 | ||
ad1c05e1 | 1531 | fd_error: |
9c1f4643 MD |
1532 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1533 | kref_error: | |
b3b8072b MD |
1534 | module_put(metadata_stream->transport->owner); |
1535 | notransport: | |
1536 | kfree(metadata_stream); | |
1537 | nomem: | |
11b5a3c2 | 1538 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1539 | return ret; |
1540 | } | |
1541 | ||
21f58fb7 FD |
1542 | static |
1543 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1544 | { | |
1545 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
1546 | struct channel *chan = event_notifier_group->chan; | |
1547 | struct lib_ring_buffer *buf; | |
1548 | int ret; | |
1549 | void *stream_priv; | |
1550 | ||
1551 | buf = event_notifier_group->ops->buffer_read_open(chan); | |
1552 | if (!buf) | |
1553 | return -ENOENT; | |
1554 | ||
1555 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1556 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1557 | ret = -EOVERFLOW; | |
1558 | goto refcount_error; | |
1559 | } | |
1560 | event_notifier_group->buf = buf; | |
1561 | stream_priv = event_notifier_group; | |
1562 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1563 | <tng_event_notifier_group_notif_fops, | |
1564 | "[lttng_event_notifier_stream]"); | |
1565 | if (ret < 0) | |
1566 | goto fd_error; | |
1567 | ||
1568 | return ret; | |
1569 | ||
1570 | fd_error: | |
1571 | atomic_long_dec(¬if_file->f_count); | |
1572 | refcount_error: | |
1573 | event_notifier_group->ops->buffer_read_close(buf); | |
1574 | return ret; | |
1575 | } | |
1576 | ||
badfe9f5 MD |
1577 | static |
1578 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
1579 | { | |
1580 | /* Limit ABI to implemented features. */ | |
1581 | switch (event_param->instrumentation) { | |
1582 | case LTTNG_KERNEL_SYSCALL: | |
1583 | switch (event_param->u.syscall.entryexit) { | |
1584 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1585 | break; | |
1586 | default: | |
1587 | return -EINVAL; | |
1588 | } | |
1589 | switch (event_param->u.syscall.abi) { | |
1590 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1591 | break; | |
1592 | default: | |
1593 | return -EINVAL; | |
1594 | } | |
1595 | switch (event_param->u.syscall.match) { | |
1596 | case LTTNG_SYSCALL_MATCH_NAME: | |
1597 | break; | |
1598 | default: | |
1599 | return -EINVAL; | |
1600 | } | |
1601 | break; | |
1602 | ||
1603 | case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */ | |
1604 | case LTTNG_KERNEL_KPROBE: /* Fallthrough */ | |
1605 | case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */ | |
1606 | case LTTNG_KERNEL_NOOP: /* Fallthrough */ | |
1607 | case LTTNG_KERNEL_UPROBE: | |
1608 | break; | |
1609 | ||
1610 | case LTTNG_KERNEL_FUNCTION: /* Fallthrough */ | |
1611 | default: | |
1612 | return -EINVAL; | |
1613 | } | |
1614 | return 0; | |
1615 | } | |
1616 | ||
653fe716 | 1617 | static |
c0e31d2e | 1618 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1619 | struct lttng_kernel_event *event_param) |
653fe716 | 1620 | { |
a90917c3 | 1621 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1622 | int event_fd, ret; |
11b5a3c2 | 1623 | struct file *event_file; |
3c997079 | 1624 | void *priv; |
653fe716 | 1625 | |
6dccd6c1 JD |
1626 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1627 | switch (event_param->instrumentation) { | |
7371f44c | 1628 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1629 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1630 | break; |
ab2277d6 | 1631 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1632 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1633 | break; |
ab2277d6 | 1634 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1635 | WARN_ON_ONCE(1); |
1636 | /* Not implemented. */ | |
e0a7a7c4 MD |
1637 | break; |
1638 | default: | |
1639 | break; | |
1640 | } | |
33a39a3c MD |
1641 | event_fd = lttng_get_unused_fd(); |
1642 | if (event_fd < 0) { | |
1643 | ret = event_fd; | |
1644 | goto fd_error; | |
1645 | } | |
1646 | event_file = anon_inode_getfile("[lttng_event]", | |
1647 | <tng_event_fops, | |
1648 | NULL, O_RDWR); | |
1649 | if (IS_ERR(event_file)) { | |
1650 | ret = PTR_ERR(event_file); | |
1651 | goto file_error; | |
1652 | } | |
9c1f4643 | 1653 | /* The event holds a reference on the channel */ |
98d7281c | 1654 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1655 | ret = -EOVERFLOW; |
9c1f4643 MD |
1656 | goto refcount_error; |
1657 | } | |
badfe9f5 MD |
1658 | ret = lttng_abi_validate_event_param(event_param); |
1659 | if (ret) | |
1660 | goto event_error; | |
33a39a3c MD |
1661 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1662 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
b2bc0bc8 | 1663 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1664 | |
4993071a PP |
1665 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1666 | /* | |
1667 | * If the event name is a star globbing pattern, | |
1668 | * we create the special star globbing enabler. | |
1669 | */ | |
b2bc0bc8 | 1670 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1671 | event_param, channel); |
3c997079 | 1672 | } else { |
b2bc0bc8 | 1673 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1674 | event_param, channel); |
1ec65de1 | 1675 | } |
b2bc0bc8 | 1676 | priv = event_enabler; |
33a39a3c MD |
1677 | } else { |
1678 | struct lttng_event *event; | |
4ee2453d | 1679 | |
33a39a3c MD |
1680 | /* |
1681 | * We tolerate no failure path after event creation. It | |
1682 | * will stay invariant for the rest of the session. | |
1683 | */ | |
1684 | event = lttng_event_create(channel, event_param, | |
1685 | NULL, NULL, | |
1686 | event_param->instrumentation); | |
1687 | WARN_ON_ONCE(!event); | |
1688 | if (IS_ERR(event)) { | |
1689 | ret = PTR_ERR(event); | |
1690 | goto event_error; | |
80f87dd2 | 1691 | } |
33a39a3c | 1692 | priv = event; |
03037b98 | 1693 | } |
33a39a3c MD |
1694 | event_file->private_data = priv; |
1695 | fd_install(event_fd, event_file); | |
653fe716 MD |
1696 | return event_fd; |
1697 | ||
03037b98 | 1698 | event_error: |
9c1f4643 MD |
1699 | atomic_long_dec(&channel_file->f_count); |
1700 | refcount_error: | |
c0e31d2e | 1701 | fput(event_file); |
653fe716 MD |
1702 | file_error: |
1703 | put_unused_fd(event_fd); | |
1704 | fd_error: | |
653fe716 MD |
1705 | return ret; |
1706 | } | |
ad1c05e1 | 1707 | |
dffef45d FD |
1708 | static |
1709 | long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1710 | { | |
1711 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1712 | enum lttng_event_type *evtype = file->private_data; | |
1713 | ||
1714 | switch (cmd) { | |
1715 | case LTTNG_KERNEL_ENABLE: | |
1716 | switch (*evtype) { | |
1717 | case LTTNG_TYPE_EVENT: | |
1718 | return -EINVAL; | |
1719 | case LTTNG_TYPE_ENABLER: | |
1720 | event_notifier_enabler = file->private_data; | |
1721 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
1722 | default: | |
1723 | WARN_ON_ONCE(1); | |
1724 | return -ENOSYS; | |
1725 | } | |
1726 | case LTTNG_KERNEL_DISABLE: | |
1727 | switch (*evtype) { | |
1728 | case LTTNG_TYPE_EVENT: | |
1729 | return -EINVAL; | |
1730 | case LTTNG_TYPE_ENABLER: | |
1731 | event_notifier_enabler = file->private_data; | |
1732 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
1733 | default: | |
1734 | WARN_ON_ONCE(1); | |
1735 | return -ENOSYS; | |
1736 | } | |
1737 | case LTTNG_KERNEL_FILTER: | |
1738 | switch (*evtype) { | |
1739 | case LTTNG_TYPE_EVENT: | |
1740 | return -EINVAL; | |
1741 | case LTTNG_TYPE_ENABLER: | |
1742 | event_notifier_enabler = file->private_data; | |
1743 | return lttng_event_notifier_enabler_attach_bytecode(event_notifier_enabler, | |
1744 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1745 | default: | |
1746 | WARN_ON_ONCE(1); | |
1747 | return -ENOSYS; | |
1748 | } | |
1749 | default: | |
1750 | return -ENOIOCTLCMD; | |
1751 | } | |
1752 | } | |
1753 | ||
1754 | static | |
1755 | int lttng_event_notifier_release(struct inode *inode, struct file *file) | |
1756 | { | |
1757 | struct lttng_event_notifier *event_notifier; | |
1758 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1759 | enum lttng_event_type *evtype = file->private_data; | |
1760 | ||
1761 | if (!evtype) | |
1762 | return 0; | |
1763 | ||
1764 | switch (*evtype) { | |
1765 | case LTTNG_TYPE_EVENT: | |
1766 | event_notifier = file->private_data; | |
1767 | if (event_notifier) | |
1768 | fput(event_notifier->group->file); | |
1769 | break; | |
1770 | case LTTNG_TYPE_ENABLER: | |
1771 | event_notifier_enabler = file->private_data; | |
1772 | if (event_notifier_enabler) | |
1773 | fput(event_notifier_enabler->group->file); | |
1774 | break; | |
1775 | default: | |
1776 | WARN_ON_ONCE(1); | |
1777 | break; | |
1778 | } | |
1779 | ||
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | static const struct file_operations lttng_event_notifier_fops = { | |
1784 | .owner = THIS_MODULE, | |
1785 | .release = lttng_event_notifier_release, | |
1786 | .unlocked_ioctl = lttng_event_notifier_ioctl, | |
1787 | #ifdef CONFIG_COMPAT | |
1788 | .compat_ioctl = lttng_event_notifier_ioctl, | |
1789 | #endif | |
1790 | }; | |
1791 | ||
1792 | static | |
1793 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
1794 | struct lttng_kernel_event_notifier *event_notifier_param) | |
1795 | { | |
1796 | struct lttng_event_notifier_group *event_notifier_group = | |
1797 | event_notifier_group_file->private_data; | |
1798 | int event_notifier_fd, ret; | |
1799 | struct file *event_notifier_file; | |
1800 | void *priv; | |
1801 | ||
1802 | switch (event_notifier_param->event.instrumentation) { | |
1803 | case LTTNG_KERNEL_TRACEPOINT: | |
1804 | case LTTNG_KERNEL_KPROBE: | |
1805 | case LTTNG_KERNEL_UPROBE: | |
1806 | case LTTNG_KERNEL_KRETPROBE: | |
1807 | case LTTNG_KERNEL_FUNCTION: | |
1808 | case LTTNG_KERNEL_NOOP: | |
1809 | case LTTNG_KERNEL_SYSCALL: | |
1810 | default: | |
1811 | ret = -EINVAL; | |
1812 | goto inval_instr; | |
1813 | } | |
1814 | ||
1815 | event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1816 | ||
1817 | event_notifier_fd = lttng_get_unused_fd(); | |
1818 | if (event_notifier_fd < 0) { | |
1819 | ret = event_notifier_fd; | |
1820 | goto fd_error; | |
1821 | } | |
1822 | ||
1823 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
1824 | <tng_event_notifier_fops, | |
1825 | NULL, O_RDWR); | |
1826 | if (IS_ERR(event_notifier_file)) { | |
1827 | ret = PTR_ERR(event_notifier_file); | |
1828 | goto file_error; | |
1829 | } | |
1830 | ||
1831 | /* The event notifier holds a reference on the event notifier group. */ | |
1832 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
1833 | ret = -EOVERFLOW; | |
1834 | goto refcount_error; | |
1835 | } | |
1836 | ||
1837 | if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT | |
1838 | || event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1839 | struct lttng_event_notifier_enabler *enabler; | |
1840 | ||
1841 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
1842 | /* | |
1843 | * If the event name is a star globbing pattern, | |
1844 | * we create the special star globbing enabler. | |
1845 | */ | |
1846 | enabler = lttng_event_notifier_enabler_create( | |
1847 | event_notifier_group, | |
1848 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
1849 | event_notifier_param); | |
1850 | } else { | |
1851 | enabler = lttng_event_notifier_enabler_create( | |
1852 | event_notifier_group, | |
1853 | LTTNG_ENABLER_FORMAT_NAME, | |
1854 | event_notifier_param); | |
1855 | } | |
1856 | priv = enabler; | |
1857 | } else { | |
1858 | struct lttng_event_notifier *event_notifier; | |
1859 | ||
1860 | /* | |
1861 | * We tolerate no failure path after event notifier creation. | |
1862 | * It will stay invariant for the rest of the session. | |
1863 | */ | |
1864 | event_notifier = lttng_event_notifier_create(NULL, | |
1865 | event_notifier_param->event.token, event_notifier_group, | |
1866 | event_notifier_param, NULL, | |
1867 | event_notifier_param->event.instrumentation); | |
1868 | WARN_ON_ONCE(!event_notifier); | |
1869 | if (IS_ERR(event_notifier)) { | |
1870 | ret = PTR_ERR(event_notifier); | |
1871 | goto event_notifier_error; | |
1872 | } | |
1873 | priv = event_notifier; | |
1874 | } | |
1875 | event_notifier_file->private_data = priv; | |
1876 | fd_install(event_notifier_fd, event_notifier_file); | |
1877 | return event_notifier_fd; | |
1878 | ||
1879 | event_notifier_error: | |
1880 | atomic_long_dec(&event_notifier_group_file->f_count); | |
1881 | refcount_error: | |
1882 | fput(event_notifier_file); | |
1883 | file_error: | |
1884 | put_unused_fd(event_notifier_fd); | |
1885 | fd_error: | |
1886 | inval_instr: | |
1887 | return ret; | |
1888 | } | |
1889 | ||
750b05f2 FD |
1890 | static |
1891 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
1892 | unsigned long arg) | |
1893 | { | |
1894 | switch (cmd) { | |
21f58fb7 FD |
1895 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
1896 | { | |
1897 | return lttng_abi_open_event_notifier_group_stream(file); | |
1898 | } | |
dffef45d FD |
1899 | case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE: |
1900 | { | |
1901 | struct lttng_kernel_event_notifier uevent_notifier_param; | |
1902 | ||
1903 | if (copy_from_user(&uevent_notifier_param, | |
1904 | (struct lttng_kernel_event_notifier __user *) arg, | |
1905 | sizeof(uevent_notifier_param))) | |
1906 | return -EFAULT; | |
1907 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
1908 | } | |
750b05f2 FD |
1909 | default: |
1910 | return -ENOIOCTLCMD; | |
1911 | } | |
1912 | return 0; | |
1913 | } | |
1914 | ||
1915 | static | |
1916 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
1917 | { | |
1918 | struct lttng_event_notifier_group *event_notifier_group = | |
1919 | file->private_data; | |
1920 | ||
1921 | if (event_notifier_group) | |
1922 | lttng_event_notifier_group_destroy(event_notifier_group); | |
1923 | return 0; | |
1924 | } | |
1925 | ||
1926 | static const struct file_operations lttng_event_notifier_group_fops = { | |
1927 | .owner = THIS_MODULE, | |
1928 | .release = lttng_event_notifier_group_release, | |
1929 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
1930 | #ifdef CONFIG_COMPAT | |
1931 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
1932 | #endif | |
1933 | }; | |
1934 | ||
ad1c05e1 MD |
1935 | /** |
1936 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1937 | * | |
c0e31d2e | 1938 | * @file: the file |
ad1c05e1 MD |
1939 | * @cmd: the command |
1940 | * @arg: command arg | |
1941 | * | |
1942 | * This ioctl implements lttng commands: | |
38d024ae | 1943 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1944 | * Returns an event stream file descriptor or failure. |
1945 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1946 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1947 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1948 | * LTTNG_KERNEL_CONTEXT |
1949 | * Prepend a context field to each event in the channel | |
e64957da MD |
1950 | * LTTNG_KERNEL_ENABLE |
1951 | * Enable recording for events in this channel (weak enable) | |
1952 | * LTTNG_KERNEL_DISABLE | |
1953 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1954 | * |
baf20995 MD |
1955 | * Channel and event file descriptors also hold a reference on the session. |
1956 | */ | |
ad1c05e1 | 1957 | static |
c0e31d2e | 1958 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1959 | { |
a90917c3 | 1960 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1961 | |
baf20995 | 1962 | switch (cmd) { |
6dccd6c1 | 1963 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1964 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1965 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1966 | case LTTNG_KERNEL_OLD_EVENT: |
1967 | { | |
1968 | struct lttng_kernel_event *uevent_param; | |
1969 | struct lttng_kernel_old_event *old_uevent_param; | |
1970 | int ret; | |
1971 | ||
1972 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1973 | GFP_KERNEL); | |
1974 | if (!uevent_param) { | |
1975 | ret = -ENOMEM; | |
1976 | goto old_event_end; | |
1977 | } | |
1978 | old_uevent_param = kmalloc( | |
1979 | sizeof(struct lttng_kernel_old_event), | |
1980 | GFP_KERNEL); | |
1981 | if (!old_uevent_param) { | |
1982 | ret = -ENOMEM; | |
1983 | goto old_event_error_free_param; | |
1984 | } | |
1985 | if (copy_from_user(old_uevent_param, | |
1986 | (struct lttng_kernel_old_event __user *) arg, | |
1987 | sizeof(struct lttng_kernel_old_event))) { | |
1988 | ret = -EFAULT; | |
1989 | goto old_event_error_free_old_param; | |
1990 | } | |
1991 | ||
1992 | memcpy(uevent_param->name, old_uevent_param->name, | |
1993 | sizeof(uevent_param->name)); | |
1994 | uevent_param->instrumentation = | |
1995 | old_uevent_param->instrumentation; | |
1996 | ||
1997 | switch (old_uevent_param->instrumentation) { | |
1998 | case LTTNG_KERNEL_KPROBE: | |
1999 | uevent_param->u.kprobe.addr = | |
2000 | old_uevent_param->u.kprobe.addr; | |
2001 | uevent_param->u.kprobe.offset = | |
2002 | old_uevent_param->u.kprobe.offset; | |
2003 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2004 | old_uevent_param->u.kprobe.symbol_name, | |
2005 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2006 | break; | |
2007 | case LTTNG_KERNEL_KRETPROBE: | |
2008 | uevent_param->u.kretprobe.addr = | |
2009 | old_uevent_param->u.kretprobe.addr; | |
2010 | uevent_param->u.kretprobe.offset = | |
2011 | old_uevent_param->u.kretprobe.offset; | |
2012 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2013 | old_uevent_param->u.kretprobe.symbol_name, | |
2014 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2015 | break; | |
2016 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
2017 | WARN_ON_ONCE(1); |
2018 | /* Not implemented. */ | |
6dccd6c1 JD |
2019 | break; |
2020 | default: | |
2021 | break; | |
2022 | } | |
2023 | ret = lttng_abi_create_event(file, uevent_param); | |
2024 | ||
2025 | old_event_error_free_old_param: | |
2026 | kfree(old_uevent_param); | |
2027 | old_event_error_free_param: | |
2028 | kfree(uevent_param); | |
2029 | old_event_end: | |
2030 | return ret; | |
2031 | } | |
38d024ae | 2032 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
2033 | { |
2034 | struct lttng_kernel_event uevent_param; | |
2035 | ||
2036 | if (copy_from_user(&uevent_param, | |
2037 | (struct lttng_kernel_event __user *) arg, | |
2038 | sizeof(uevent_param))) | |
2039 | return -EFAULT; | |
2040 | return lttng_abi_create_event(file, &uevent_param); | |
2041 | } | |
2042 | case LTTNG_KERNEL_OLD_CONTEXT: | |
2043 | { | |
2044 | struct lttng_kernel_context *ucontext_param; | |
2045 | struct lttng_kernel_old_context *old_ucontext_param; | |
2046 | int ret; | |
2047 | ||
2048 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
2049 | GFP_KERNEL); | |
2050 | if (!ucontext_param) { | |
2051 | ret = -ENOMEM; | |
2052 | goto old_ctx_end; | |
2053 | } | |
2054 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
2055 | GFP_KERNEL); | |
2056 | if (!old_ucontext_param) { | |
2057 | ret = -ENOMEM; | |
2058 | goto old_ctx_error_free_param; | |
2059 | } | |
2060 | ||
2061 | if (copy_from_user(old_ucontext_param, | |
2062 | (struct lttng_kernel_old_context __user *) arg, | |
2063 | sizeof(struct lttng_kernel_old_context))) { | |
2064 | ret = -EFAULT; | |
2065 | goto old_ctx_error_free_old_param; | |
2066 | } | |
2067 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2068 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2069 | sizeof(ucontext_param->padding)); | |
2070 | /* only type that uses the union */ | |
2071 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
2072 | ucontext_param->u.perf_counter.type = | |
2073 | old_ucontext_param->u.perf_counter.type; | |
2074 | ucontext_param->u.perf_counter.config = | |
2075 | old_ucontext_param->u.perf_counter.config; | |
2076 | memcpy(ucontext_param->u.perf_counter.name, | |
2077 | old_ucontext_param->u.perf_counter.name, | |
2078 | sizeof(ucontext_param->u.perf_counter.name)); | |
2079 | } | |
2080 | ||
2081 | ret = lttng_abi_add_context(file, | |
2082 | ucontext_param, | |
2083 | &channel->ctx, channel->session); | |
2084 | ||
2085 | old_ctx_error_free_old_param: | |
2086 | kfree(old_ucontext_param); | |
2087 | old_ctx_error_free_param: | |
2088 | kfree(ucontext_param); | |
2089 | old_ctx_end: | |
2090 | return ret; | |
2091 | } | |
8070f5c0 | 2092 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
2093 | { |
2094 | struct lttng_kernel_context ucontext_param; | |
2095 | ||
2096 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 2097 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
2098 | sizeof(ucontext_param))) |
2099 | return -EFAULT; | |
2100 | return lttng_abi_add_context(file, | |
2101 | &ucontext_param, | |
8070f5c0 | 2102 | &channel->ctx, channel->session); |
6dccd6c1 JD |
2103 | } |
2104 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2105 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 2106 | return lttng_channel_enable(channel); |
6dccd6c1 | 2107 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2108 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 2109 | return lttng_channel_disable(channel); |
12e579db MD |
2110 | case LTTNG_KERNEL_SYSCALL_MASK: |
2111 | return lttng_channel_syscall_mask(channel, | |
2112 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
2113 | default: |
2114 | return -ENOIOCTLCMD; | |
2115 | } | |
2116 | } | |
2117 | ||
5dbbdb43 MD |
2118 | /** |
2119 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2120 | * | |
2121 | * @file: the file | |
2122 | * @cmd: the command | |
2123 | * @arg: command arg | |
2124 | * | |
2125 | * This ioctl implements lttng commands: | |
38d024ae | 2126 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
2127 | * Returns an event stream file descriptor or failure. |
2128 | * | |
2129 | * Channel and event file descriptors also hold a reference on the session. | |
2130 | */ | |
2131 | static | |
2132 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2133 | { | |
2134 | switch (cmd) { | |
6dccd6c1 | 2135 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2136 | case LTTNG_KERNEL_STREAM: |
d83004aa | 2137 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2138 | default: |
2139 | return -ENOIOCTLCMD; | |
2140 | } | |
2141 | } | |
2142 | ||
653fe716 MD |
2143 | /** |
2144 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2145 | * | |
c0e31d2e | 2146 | * @file: the file |
653fe716 MD |
2147 | * @wait: poll table |
2148 | */ | |
c0e31d2e | 2149 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2150 | { |
a90917c3 | 2151 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2152 | unsigned int mask = 0; |
2153 | ||
c0e31d2e | 2154 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2155 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2156 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2157 | wait); | |
653fe716 | 2158 | |
254ec7bc MD |
2159 | if (channel->ops->is_disabled(channel->chan)) |
2160 | return POLLERR; | |
24cedcfe | 2161 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2162 | return POLLHUP; |
f71ecafa | 2163 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2164 | return POLLIN | POLLRDNORM; |
f71ecafa | 2165 | return 0; |
653fe716 MD |
2166 | } |
2167 | return mask; | |
2168 | ||
2169 | } | |
2170 | ||
0a84a57f MD |
2171 | static |
2172 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2173 | { | |
a90917c3 | 2174 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
2175 | |
2176 | if (channel) | |
2177 | fput(channel->session->file); | |
0a84a57f MD |
2178 | return 0; |
2179 | } | |
2180 | ||
d83004aa JD |
2181 | static |
2182 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2183 | { | |
2184 | struct lttng_channel *channel = file->private_data; | |
2185 | ||
2186 | if (channel) { | |
d83004aa | 2187 | fput(channel->session->file); |
a3381417 | 2188 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2189 | } |
2190 | ||
2191 | return 0; | |
2192 | } | |
2193 | ||
ad1c05e1 | 2194 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2195 | .owner = THIS_MODULE, |
03037b98 | 2196 | .release = lttng_channel_release, |
653fe716 | 2197 | .poll = lttng_channel_poll, |
ad1c05e1 | 2198 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2199 | #ifdef CONFIG_COMPAT |
03037b98 | 2200 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2201 | #endif |
11b5a3c2 | 2202 | }; |
baf20995 | 2203 | |
5dbbdb43 | 2204 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2205 | .owner = THIS_MODULE, |
d83004aa | 2206 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2207 | .unlocked_ioctl = lttng_metadata_ioctl, |
2208 | #ifdef CONFIG_COMPAT | |
2209 | .compat_ioctl = lttng_metadata_ioctl, | |
2210 | #endif | |
2211 | }; | |
2212 | ||
8070f5c0 MD |
2213 | /** |
2214 | * lttng_event_ioctl - lttng syscall through ioctl | |
2215 | * | |
2216 | * @file: the file | |
2217 | * @cmd: the command | |
2218 | * @arg: command arg | |
2219 | * | |
2220 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
2221 | * LTTNG_KERNEL_CONTEXT |
2222 | * Prepend a context field to each record of this event | |
e64957da MD |
2223 | * LTTNG_KERNEL_ENABLE |
2224 | * Enable recording for this event (weak enable) | |
2225 | * LTTNG_KERNEL_DISABLE | |
2226 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
2227 | */ |
2228 | static | |
2229 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2230 | { | |
3c997079 | 2231 | struct lttng_event *event; |
b2bc0bc8 | 2232 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2233 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
2234 | |
2235 | switch (cmd) { | |
6dccd6c1 JD |
2236 | case LTTNG_KERNEL_OLD_CONTEXT: |
2237 | { | |
3c997079 MD |
2238 | /* Not implemented */ |
2239 | return -ENOSYS; | |
6dccd6c1 | 2240 | } |
8070f5c0 | 2241 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 2242 | { |
3c997079 MD |
2243 | /* Not implemented */ |
2244 | return -ENOSYS; | |
6dccd6c1 JD |
2245 | } |
2246 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2247 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
2248 | switch (*evtype) { |
2249 | case LTTNG_TYPE_EVENT: | |
2250 | event = file->private_data; | |
2251 | return lttng_event_enable(event); | |
2252 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2253 | event_enabler = file->private_data; |
2254 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
2255 | default: |
2256 | WARN_ON_ONCE(1); | |
2257 | return -ENOSYS; | |
2258 | } | |
6dccd6c1 | 2259 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2260 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
2261 | switch (*evtype) { |
2262 | case LTTNG_TYPE_EVENT: | |
2263 | event = file->private_data; | |
2264 | return lttng_event_disable(event); | |
2265 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2266 | event_enabler = file->private_data; |
2267 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
2268 | default: |
2269 | WARN_ON_ONCE(1); | |
2270 | return -ENOSYS; | |
2271 | } | |
07dfc1d0 MD |
2272 | case LTTNG_KERNEL_FILTER: |
2273 | switch (*evtype) { | |
2274 | case LTTNG_TYPE_EVENT: | |
2275 | return -EINVAL; | |
2276 | case LTTNG_TYPE_ENABLER: | |
2277 | { | |
b2bc0bc8 FD |
2278 | event_enabler = file->private_data; |
2279 | return lttng_event_enabler_attach_bytecode(event_enabler, | |
07dfc1d0 MD |
2280 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2281 | } | |
0586316f MD |
2282 | default: |
2283 | WARN_ON_ONCE(1); | |
2284 | return -ENOSYS; | |
07dfc1d0 | 2285 | } |
3aed4dca FD |
2286 | case LTTNG_KERNEL_ADD_CALLSITE: |
2287 | switch (*evtype) { | |
2288 | case LTTNG_TYPE_EVENT: | |
2289 | event = file->private_data; | |
2290 | return lttng_event_add_callsite(event, | |
2291 | (struct lttng_kernel_event_callsite __user *) arg); | |
2292 | case LTTNG_TYPE_ENABLER: | |
2293 | return -EINVAL; | |
64c147c0 MD |
2294 | default: |
2295 | WARN_ON_ONCE(1); | |
2296 | return -ENOSYS; | |
3aed4dca | 2297 | } |
8070f5c0 MD |
2298 | default: |
2299 | return -ENOIOCTLCMD; | |
2300 | } | |
2301 | } | |
2302 | ||
0a84a57f MD |
2303 | static |
2304 | int lttng_event_release(struct inode *inode, struct file *file) | |
2305 | { | |
3c997079 | 2306 | struct lttng_event *event; |
b2bc0bc8 | 2307 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2308 | enum lttng_event_type *evtype = file->private_data; |
2309 | ||
2310 | if (!evtype) | |
2311 | return 0; | |
2312 | ||
2313 | switch (*evtype) { | |
2314 | case LTTNG_TYPE_EVENT: | |
2315 | event = file->private_data; | |
2316 | if (event) | |
2317 | fput(event->chan->file); | |
2318 | break; | |
2319 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2320 | event_enabler = file->private_data; |
2321 | if (event_enabler) | |
2322 | fput(event_enabler->chan->file); | |
3c997079 MD |
2323 | break; |
2324 | default: | |
2325 | WARN_ON_ONCE(1); | |
2326 | break; | |
2327 | } | |
c269fff4 | 2328 | |
0a84a57f MD |
2329 | return 0; |
2330 | } | |
2331 | ||
3b923e5b | 2332 | /* TODO: filter control ioctl */ |
0a84a57f | 2333 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 2334 | .owner = THIS_MODULE, |
0a84a57f | 2335 | .release = lttng_event_release, |
8070f5c0 MD |
2336 | .unlocked_ioctl = lttng_event_ioctl, |
2337 | #ifdef CONFIG_COMPAT | |
2338 | .compat_ioctl = lttng_event_ioctl, | |
2339 | #endif | |
11b5a3c2 | 2340 | }; |
0a84a57f | 2341 | |
3b731ab1 JD |
2342 | static int put_u64(uint64_t val, unsigned long arg) |
2343 | { | |
2344 | return put_user(val, (uint64_t __user *) arg); | |
2345 | } | |
2346 | ||
8b97fd42 MD |
2347 | static int put_u32(uint32_t val, unsigned long arg) |
2348 | { | |
2349 | return put_user(val, (uint32_t __user *) arg); | |
2350 | } | |
2351 | ||
ed8d02d6 JD |
2352 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2353 | unsigned int cmd, unsigned long arg) | |
2354 | { | |
3b731ab1 JD |
2355 | struct lib_ring_buffer *buf = filp->private_data; |
2356 | struct channel *chan = buf->backend.chan; | |
2357 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2358 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2359 | int ret; |
2360 | ||
2361 | if (atomic_read(&chan->record_disabled)) | |
2362 | return -EIO; | |
2363 | ||
ed8d02d6 | 2364 | switch (cmd) { |
3b731ab1 JD |
2365 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
2366 | { | |
2367 | uint64_t ts; | |
2368 | ||
dd5a0db3 | 2369 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2370 | if (ret < 0) |
2371 | goto error; | |
2372 | return put_u64(ts, arg); | |
2373 | } | |
2374 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
2375 | { | |
2376 | uint64_t ts; | |
2377 | ||
dd5a0db3 | 2378 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2379 | if (ret < 0) |
2380 | goto error; | |
2381 | return put_u64(ts, arg); | |
2382 | } | |
2383 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
2384 | { | |
2385 | uint64_t ed; | |
2386 | ||
dd5a0db3 | 2387 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2388 | if (ret < 0) |
2389 | goto error; | |
2390 | return put_u64(ed, arg); | |
2391 | } | |
2392 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
2393 | { | |
2394 | uint64_t cs; | |
2395 | ||
dd5a0db3 | 2396 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2397 | if (ret < 0) |
2398 | goto error; | |
2399 | return put_u64(cs, arg); | |
2400 | } | |
2401 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
2402 | { | |
2403 | uint64_t ps; | |
2404 | ||
dd5a0db3 | 2405 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2406 | if (ret < 0) |
2407 | goto error; | |
2408 | return put_u64(ps, arg); | |
2409 | } | |
2410 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
2411 | { | |
2412 | uint64_t si; | |
2413 | ||
dd5a0db3 | 2414 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2415 | if (ret < 0) |
2416 | goto error; | |
2417 | return put_u64(si, arg); | |
2418 | } | |
2348ca17 JD |
2419 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2420 | { | |
2421 | uint64_t ts; | |
2422 | ||
dd5a0db3 | 2423 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2424 | if (ret < 0) |
2425 | goto error; | |
2426 | return put_u64(ts, arg); | |
2427 | } | |
5b3cf4f9 JD |
2428 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
2429 | { | |
2430 | uint64_t seq; | |
2431 | ||
2432 | ret = ops->sequence_number(config, buf, &seq); | |
2433 | if (ret < 0) | |
2434 | goto error; | |
2435 | return put_u64(seq, arg); | |
2436 | } | |
5594698f JD |
2437 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
2438 | { | |
2439 | uint64_t id; | |
2440 | ||
2441 | ret = ops->instance_id(config, buf, &id); | |
2442 | if (ret < 0) | |
2443 | goto error; | |
2444 | return put_u64(id, arg); | |
2445 | } | |
3b731ab1 JD |
2446 | default: |
2447 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2448 | cmd, arg); | |
ed8d02d6 | 2449 | } |
3b731ab1 JD |
2450 | |
2451 | error: | |
2452 | return -ENOSYS; | |
ed8d02d6 JD |
2453 | } |
2454 | ||
2455 | #ifdef CONFIG_COMPAT | |
2456 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2457 | unsigned int cmd, unsigned long arg) | |
2458 | { | |
3b731ab1 JD |
2459 | struct lib_ring_buffer *buf = filp->private_data; |
2460 | struct channel *chan = buf->backend.chan; | |
2461 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2462 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2463 | int ret; |
2464 | ||
2465 | if (atomic_read(&chan->record_disabled)) | |
2466 | return -EIO; | |
2467 | ||
ed8d02d6 | 2468 | switch (cmd) { |
3b731ab1 JD |
2469 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2470 | { | |
2471 | uint64_t ts; | |
2472 | ||
dd5a0db3 | 2473 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2474 | if (ret < 0) |
2475 | goto error; | |
2476 | return put_u64(ts, arg); | |
2477 | } | |
2478 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
2479 | { | |
2480 | uint64_t ts; | |
2481 | ||
dd5a0db3 | 2482 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2483 | if (ret < 0) |
2484 | goto error; | |
2485 | return put_u64(ts, arg); | |
2486 | } | |
2487 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
2488 | { | |
2489 | uint64_t ed; | |
2490 | ||
dd5a0db3 | 2491 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2492 | if (ret < 0) |
2493 | goto error; | |
2494 | return put_u64(ed, arg); | |
ed8d02d6 | 2495 | } |
3b731ab1 JD |
2496 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
2497 | { | |
2498 | uint64_t cs; | |
2499 | ||
dd5a0db3 | 2500 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2501 | if (ret < 0) |
2502 | goto error; | |
2503 | return put_u64(cs, arg); | |
2504 | } | |
2505 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
2506 | { | |
2507 | uint64_t ps; | |
2508 | ||
dd5a0db3 | 2509 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2510 | if (ret < 0) |
2511 | goto error; | |
2512 | return put_u64(ps, arg); | |
2513 | } | |
2514 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
2515 | { | |
2516 | uint64_t si; | |
2517 | ||
dd5a0db3 | 2518 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2519 | if (ret < 0) |
2520 | goto error; | |
2521 | return put_u64(si, arg); | |
2522 | } | |
2348ca17 JD |
2523 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2524 | { | |
2525 | uint64_t ts; | |
2526 | ||
dd5a0db3 | 2527 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2528 | if (ret < 0) |
2529 | goto error; | |
2530 | return put_u64(ts, arg); | |
2531 | } | |
5b3cf4f9 JD |
2532 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2533 | { | |
2534 | uint64_t seq; | |
2535 | ||
2536 | ret = ops->sequence_number(config, buf, &seq); | |
2537 | if (ret < 0) | |
2538 | goto error; | |
2539 | return put_u64(seq, arg); | |
2540 | } | |
5594698f JD |
2541 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2542 | { | |
2543 | uint64_t id; | |
2544 | ||
2545 | ret = ops->instance_id(config, buf, &id); | |
2546 | if (ret < 0) | |
2547 | goto error; | |
2548 | return put_u64(id, arg); | |
2549 | } | |
3b731ab1 JD |
2550 | default: |
2551 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2552 | cmd, arg); | |
2553 | } | |
2554 | ||
2555 | error: | |
2556 | return -ENOSYS; | |
ed8d02d6 JD |
2557 | } |
2558 | #endif /* CONFIG_COMPAT */ | |
2559 | ||
2560 | static void lttng_stream_override_ring_buffer_fops(void) | |
2561 | { | |
2562 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2563 | lttng_stream_ring_buffer_file_operations.open = | |
2564 | lib_ring_buffer_file_operations.open; | |
2565 | lttng_stream_ring_buffer_file_operations.release = | |
2566 | lib_ring_buffer_file_operations.release; | |
2567 | lttng_stream_ring_buffer_file_operations.poll = | |
2568 | lib_ring_buffer_file_operations.poll; | |
2569 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2570 | lib_ring_buffer_file_operations.splice_read; | |
2571 | lttng_stream_ring_buffer_file_operations.mmap = | |
2572 | lib_ring_buffer_file_operations.mmap; | |
2573 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2574 | lttng_stream_ring_buffer_ioctl; | |
2575 | lttng_stream_ring_buffer_file_operations.llseek = | |
2576 | lib_ring_buffer_file_operations.llseek; | |
2577 | #ifdef CONFIG_COMPAT | |
2578 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2579 | lttng_stream_ring_buffer_compat_ioctl; | |
2580 | #endif | |
2581 | } | |
2582 | ||
80996790 | 2583 | int __init lttng_abi_init(void) |
baf20995 MD |
2584 | { |
2585 | int ret = 0; | |
2586 | ||
263b6c88 | 2587 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2588 | lttng_clock_ref(); |
f771eda6 JD |
2589 | |
2590 | ret = lttng_tp_mempool_init(); | |
2591 | if (ret) { | |
2592 | goto error; | |
2593 | } | |
2594 | ||
d29348f7 | 2595 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2596 | <tng_proc_ops, NULL); |
2470a237 | 2597 | |
255e52a4 | 2598 | if (!lttng_proc_dentry) { |
5a15f70c | 2599 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
2600 | ret = -ENOMEM; |
2601 | goto error; | |
2602 | } | |
ed8d02d6 | 2603 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2604 | return 0; |
ed8d02d6 | 2605 | |
baf20995 | 2606 | error: |
f771eda6 | 2607 | lttng_tp_mempool_destroy(); |
2754583e | 2608 | lttng_clock_unref(); |
baf20995 MD |
2609 | return ret; |
2610 | } | |
2611 | ||
e6e65fcd MD |
2612 | /* No __exit annotation because used by init error path too. */ |
2613 | void lttng_abi_exit(void) | |
baf20995 | 2614 | { |
f771eda6 | 2615 | lttng_tp_mempool_destroy(); |
2754583e | 2616 | lttng_clock_unref(); |
e6a17f26 MD |
2617 | if (lttng_proc_dentry) |
2618 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2619 | } |