Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
e8951e63 | 3 | * lttng-abi.c |
baf20995 | 4 | * |
e8951e63 | 5 | * LTTng ABI |
baf20995 | 6 | * |
886d51a3 MD |
7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8 | * | |
baf20995 MD |
9 | * Mimic system calls for: |
10 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
11 | * - channel creation, returns a file descriptor or failure. |
12 | * - Operates on a session file descriptor | |
13 | * - Takes all channel options as parameters. | |
14 | * - stream get, returns a file descriptor or failure. | |
15 | * - Operates on a channel file descriptor. | |
16 | * - stream notifier get, returns a file descriptor or failure. | |
17 | * - Operates on a channel file descriptor. | |
18 | * - event creation, returns a file descriptor or failure. | |
19 | * - Operates on a channel file descriptor | |
20 | * - Takes an event name as parameter | |
21 | * - Takes an instrumentation source as parameter | |
22 | * - e.g. tracepoints, dynamic_probes... | |
23 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
24 | */ |
25 | ||
11b5a3c2 | 26 | #include <linux/module.h> |
e6a17f26 | 27 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/slab.h> | |
abc0446a | 32 | #include <linux/err.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
24591303 MD |
34 | #include <ringbuffer/vfs.h> |
35 | #include <ringbuffer/backend.h> | |
36 | #include <ringbuffer/frontend.h> | |
241ae9a8 MD |
37 | #include <wrapper/poll.h> |
38 | #include <wrapper/file.h> | |
39 | #include <wrapper/kref.h> | |
6657edec | 40 | #include <wrapper/barrier.h> |
2df37e95 MD |
41 | #include <lttng/string-utils.h> |
42 | #include <lttng/abi.h> | |
43 | #include <lttng/abi-old.h> | |
44 | #include <lttng/events.h> | |
45 | #include <lttng/tracer.h> | |
46 | #include <lttng/tp-mempool.h> | |
24591303 | 47 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 48 | #include <ringbuffer/iterator.h> |
baf20995 MD |
49 | |
50 | /* | |
51 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 52 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
53 | */ |
54 | ||
e6a17f26 | 55 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 | 56 | |
5f4c791e | 57 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
58 | static const struct proc_ops lttng_proc_ops; |
59 | #else | |
60 | static const struct file_operations lttng_proc_ops; | |
61 | #endif | |
62 | ||
ad1c05e1 | 63 | static const struct file_operations lttng_session_fops; |
750b05f2 | 64 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 65 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 66 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 67 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 68 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 69 | |
9616f0bf | 70 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 71 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 72 | |
99f52fcc FD |
73 | static int validate_zeroed_padding(char *p, size_t len) |
74 | { | |
75 | size_t i; | |
76 | ||
77 | for (i = 0; i < len; i++) { | |
78 | if (p[i]) | |
79 | return -1; | |
80 | } | |
81 | return 0; | |
82 | } | |
83 | ||
a33c9927 MD |
84 | /* |
85 | * Teardown management: opened file descriptors keep a refcount on the module, | |
86 | * so it can only exit when all file descriptors are closed. | |
87 | */ | |
88 | ||
ad1c05e1 | 89 | static |
baf20995 MD |
90 | int lttng_abi_create_session(void) |
91 | { | |
a90917c3 | 92 | struct lttng_session *session; |
c0e31d2e | 93 | struct file *session_file; |
11b5a3c2 | 94 | int session_fd, ret; |
baf20995 | 95 | |
a90917c3 | 96 | session = lttng_session_create(); |
baf20995 MD |
97 | if (!session) |
98 | return -ENOMEM; | |
4ac10b76 | 99 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
100 | if (session_fd < 0) { |
101 | ret = session_fd; | |
102 | goto fd_error; | |
103 | } | |
c0e31d2e | 104 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 105 | <tng_session_fops, |
baf20995 | 106 | session, O_RDWR); |
c0e31d2e MD |
107 | if (IS_ERR(session_file)) { |
108 | ret = PTR_ERR(session_file); | |
baf20995 MD |
109 | goto file_error; |
110 | } | |
c0e31d2e MD |
111 | session->file = session_file; |
112 | fd_install(session_fd, session_file); | |
baf20995 MD |
113 | return session_fd; |
114 | ||
115 | file_error: | |
116 | put_unused_fd(session_fd); | |
117 | fd_error: | |
a90917c3 | 118 | lttng_session_destroy(session); |
baf20995 MD |
119 | return ret; |
120 | } | |
121 | ||
21f58fb7 FD |
122 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
123 | { | |
124 | struct lttng_event_notifier_group *event_notifier_group = | |
125 | container_of(entry, struct lttng_event_notifier_group, | |
126 | wakeup_pending); | |
127 | wake_up_interruptible(&event_notifier_group->read_wait); | |
128 | } | |
129 | ||
750b05f2 FD |
130 | static |
131 | int lttng_abi_create_event_notifier_group(void) | |
132 | { | |
133 | struct lttng_event_notifier_group *event_notifier_group; | |
134 | struct file *event_notifier_group_file; | |
135 | int event_notifier_group_fd, ret; | |
136 | ||
137 | event_notifier_group = lttng_event_notifier_group_create(); | |
138 | if (!event_notifier_group) | |
139 | return -ENOMEM; | |
140 | ||
141 | event_notifier_group_fd = lttng_get_unused_fd(); | |
142 | if (event_notifier_group_fd < 0) { | |
143 | ret = event_notifier_group_fd; | |
144 | goto fd_error; | |
145 | } | |
146 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
147 | <tng_event_notifier_group_fops, | |
148 | event_notifier_group, O_RDWR); | |
149 | if (IS_ERR(event_notifier_group_file)) { | |
150 | ret = PTR_ERR(event_notifier_group_file); | |
151 | goto file_error; | |
152 | } | |
153 | ||
154 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
155 | init_waitqueue_head(&event_notifier_group->read_wait); |
156 | init_irq_work(&event_notifier_group->wakeup_pending, | |
157 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
158 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
159 | return event_notifier_group_fd; | |
160 | ||
161 | file_error: | |
162 | put_unused_fd(event_notifier_group_fd); | |
163 | fd_error: | |
164 | lttng_event_notifier_group_destroy(event_notifier_group); | |
165 | return ret; | |
166 | } | |
167 | ||
271b6681 MD |
168 | static |
169 | int lttng_abi_tracepoint_list(void) | |
170 | { | |
171 | struct file *tracepoint_list_file; | |
172 | int file_fd, ret; | |
173 | ||
4ac10b76 | 174 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
175 | if (file_fd < 0) { |
176 | ret = file_fd; | |
177 | goto fd_error; | |
178 | } | |
30f18bf0 | 179 | |
8ee099b6 | 180 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
181 | <tng_tracepoint_list_fops, |
182 | NULL, O_RDWR); | |
183 | if (IS_ERR(tracepoint_list_file)) { | |
184 | ret = PTR_ERR(tracepoint_list_file); | |
185 | goto file_error; | |
186 | } | |
30f18bf0 MD |
187 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
188 | if (ret < 0) | |
189 | goto open_error; | |
271b6681 MD |
190 | fd_install(file_fd, tracepoint_list_file); |
191 | return file_fd; | |
192 | ||
30f18bf0 MD |
193 | open_error: |
194 | fput(tracepoint_list_file); | |
271b6681 MD |
195 | file_error: |
196 | put_unused_fd(file_fd); | |
197 | fd_error: | |
198 | return ret; | |
199 | } | |
200 | ||
f127e61e MD |
201 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
202 | static inline | |
203 | int lttng_abi_syscall_list(void) | |
204 | { | |
205 | return -ENOSYS; | |
206 | } | |
207 | #else | |
208 | static | |
209 | int lttng_abi_syscall_list(void) | |
210 | { | |
211 | struct file *syscall_list_file; | |
212 | int file_fd, ret; | |
213 | ||
214 | file_fd = lttng_get_unused_fd(); | |
215 | if (file_fd < 0) { | |
216 | ret = file_fd; | |
217 | goto fd_error; | |
218 | } | |
219 | ||
220 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
221 | <tng_syscall_list_fops, | |
222 | NULL, O_RDWR); | |
223 | if (IS_ERR(syscall_list_file)) { | |
224 | ret = PTR_ERR(syscall_list_file); | |
225 | goto file_error; | |
226 | } | |
227 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
228 | if (ret < 0) | |
229 | goto open_error; | |
230 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
231 | return file_fd; |
232 | ||
233 | open_error: | |
234 | fput(syscall_list_file); | |
235 | file_error: | |
236 | put_unused_fd(file_fd); | |
237 | fd_error: | |
238 | return ret; | |
239 | } | |
240 | #endif | |
241 | ||
80c16bcf | 242 | static |
6dccd6c1 | 243 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 244 | { |
6dccd6c1 JD |
245 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
246 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
247 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
248 | } |
249 | ||
42cabb80 MD |
250 | static |
251 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
252 | { | |
253 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
254 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
255 | } | |
256 | ||
8070f5c0 MD |
257 | static |
258 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 259 | struct lttng_kernel_context *context_param, |
a90917c3 | 260 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 261 | { |
8070f5c0 MD |
262 | |
263 | if (session->been_active) | |
264 | return -EPERM; | |
265 | ||
6dccd6c1 | 266 | switch (context_param->ctx) { |
12a313a5 | 267 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 268 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
269 | case LTTNG_KERNEL_CONTEXT_PRIO: |
270 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
271 | case LTTNG_KERNEL_CONTEXT_NICE: |
272 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
273 | case LTTNG_KERNEL_CONTEXT_VPID: |
274 | return lttng_add_vpid_to_ctx(ctx); | |
275 | case LTTNG_KERNEL_CONTEXT_TID: | |
276 | return lttng_add_tid_to_ctx(ctx); | |
277 | case LTTNG_KERNEL_CONTEXT_VTID: | |
278 | return lttng_add_vtid_to_ctx(ctx); | |
279 | case LTTNG_KERNEL_CONTEXT_PPID: | |
280 | return lttng_add_ppid_to_ctx(ctx); | |
281 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
282 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 283 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
284 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
285 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
286 | context_param->u.perf_counter.config, | |
287 | context_param->u.perf_counter.name, | |
c24a0d71 | 288 | ctx); |
a2563e83 MD |
289 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
290 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
291 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
292 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
293 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
294 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
295 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
296 | return lttng_add_interruptible_to_ctx(ctx); | |
297 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
298 | return lttng_add_need_reschedule_to_ctx(ctx); | |
299 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
300 | return lttng_add_preemptible_to_ctx(ctx); | |
301 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
302 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
303 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
304 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
305 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
306 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
307 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
308 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
309 | return lttng_add_ipc_ns_to_ctx(ctx); | |
310 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
311 | return lttng_add_mnt_ns_to_ctx(ctx); | |
312 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
313 | return lttng_add_net_ns_to_ctx(ctx); | |
314 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
315 | return lttng_add_pid_ns_to_ctx(ctx); | |
316 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
317 | return lttng_add_user_ns_to_ctx(ctx); | |
318 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
319 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
320 | case LTTNG_KERNEL_CONTEXT_UID: |
321 | return lttng_add_uid_to_ctx(ctx); | |
322 | case LTTNG_KERNEL_CONTEXT_EUID: | |
323 | return lttng_add_euid_to_ctx(ctx); | |
324 | case LTTNG_KERNEL_CONTEXT_SUID: | |
325 | return lttng_add_suid_to_ctx(ctx); | |
326 | case LTTNG_KERNEL_CONTEXT_GID: | |
327 | return lttng_add_gid_to_ctx(ctx); | |
328 | case LTTNG_KERNEL_CONTEXT_EGID: | |
329 | return lttng_add_egid_to_ctx(ctx); | |
330 | case LTTNG_KERNEL_CONTEXT_SGID: | |
331 | return lttng_add_sgid_to_ctx(ctx); | |
332 | case LTTNG_KERNEL_CONTEXT_VUID: | |
333 | return lttng_add_vuid_to_ctx(ctx); | |
334 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
335 | return lttng_add_veuid_to_ctx(ctx); | |
336 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
337 | return lttng_add_vsuid_to_ctx(ctx); | |
338 | case LTTNG_KERNEL_CONTEXT_VGID: | |
339 | return lttng_add_vgid_to_ctx(ctx); | |
340 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
341 | return lttng_add_vegid_to_ctx(ctx); | |
342 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
343 | return lttng_add_vsgid_to_ctx(ctx); | |
876e2e92 MJ |
344 | case LTTNG_KERNEL_CONTEXT_TIME_NS: |
345 | return lttng_add_time_ns_to_ctx(ctx); | |
8070f5c0 MD |
346 | default: |
347 | return -EINVAL; | |
348 | } | |
349 | } | |
350 | ||
ad1c05e1 MD |
351 | /** |
352 | * lttng_ioctl - lttng syscall through ioctl | |
353 | * | |
c0e31d2e | 354 | * @file: the file |
ad1c05e1 MD |
355 | * @cmd: the command |
356 | * @arg: command arg | |
357 | * | |
358 | * This ioctl implements lttng commands: | |
38d024ae | 359 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 360 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
361 | * LTTNG_KERNEL_TRACER_VERSION |
362 | * Returns the LTTng kernel tracer version | |
363 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
364 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
365 | * LTTNG_KERNEL_WAIT_QUIESCENT |
366 | * Returns after all previously running probes have completed | |
42cabb80 MD |
367 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
368 | * Returns the LTTng kernel tracer ABI version | |
750b05f2 FD |
369 | * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE |
370 | * Returns a LTTng event notifier group file descriptor | |
ad1c05e1 MD |
371 | * |
372 | * The returned session will be deleted when its file descriptor is closed. | |
373 | */ | |
374 | static | |
c0e31d2e | 375 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
376 | { |
377 | switch (cmd) { | |
6dccd6c1 | 378 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 379 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 380 | return lttng_abi_create_session(); |
750b05f2 FD |
381 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE: |
382 | return lttng_abi_create_event_notifier_group(); | |
6dccd6c1 JD |
383 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
384 | { | |
385 | struct lttng_kernel_tracer_version v; | |
386 | struct lttng_kernel_old_tracer_version oldv; | |
387 | struct lttng_kernel_old_tracer_version *uversion = | |
388 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
389 | ||
390 | lttng_abi_tracer_version(&v); | |
391 | oldv.major = v.major; | |
392 | oldv.minor = v.minor; | |
393 | oldv.patchlevel = v.patchlevel; | |
394 | ||
395 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
396 | return -EFAULT; | |
397 | return 0; | |
398 | } | |
80c16bcf | 399 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
400 | { |
401 | struct lttng_kernel_tracer_version version; | |
402 | struct lttng_kernel_tracer_version *uversion = | |
403 | (struct lttng_kernel_tracer_version __user *) arg; | |
404 | ||
405 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
406 | |
407 | if (copy_to_user(uversion, &version, sizeof(version))) | |
408 | return -EFAULT; | |
409 | return 0; | |
410 | } | |
411 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
412 | { | |
413 | struct lttng_kernel_tracer_abi_version version; | |
414 | struct lttng_kernel_tracer_abi_version *uversion = | |
415 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
416 | ||
417 | lttng_abi_tracer_abi_version(&version); | |
418 | ||
6dccd6c1 JD |
419 | if (copy_to_user(uversion, &version, sizeof(version))) |
420 | return -EFAULT; | |
421 | return 0; | |
422 | } | |
423 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
424 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
425 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
426 | case LTTNG_KERNEL_SYSCALL_LIST: |
427 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 428 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
429 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
430 | synchronize_trace(); | |
431 | return 0; | |
6dccd6c1 JD |
432 | case LTTNG_KERNEL_OLD_CALIBRATE: |
433 | { | |
434 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
435 | (struct lttng_kernel_old_calibrate __user *) arg; | |
436 | struct lttng_kernel_old_calibrate old_calibrate; | |
437 | struct lttng_kernel_calibrate calibrate; | |
438 | int ret; | |
439 | ||
440 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
441 | return -EFAULT; | |
442 | calibrate.type = old_calibrate.type; | |
443 | ret = lttng_calibrate(&calibrate); | |
444 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
445 | return -EFAULT; | |
446 | return ret; | |
447 | } | |
57105fc2 MD |
448 | case LTTNG_KERNEL_CALIBRATE: |
449 | { | |
3db41b2c MD |
450 | struct lttng_kernel_calibrate __user *ucalibrate = |
451 | (struct lttng_kernel_calibrate __user *) arg; | |
452 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
453 | int ret; |
454 | ||
455 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
456 | return -EFAULT; | |
457 | ret = lttng_calibrate(&calibrate); | |
458 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
459 | return -EFAULT; | |
460 | return ret; | |
461 | } | |
ad1c05e1 MD |
462 | default: |
463 | return -ENOIOCTLCMD; | |
464 | } | |
465 | } | |
466 | ||
5f4c791e | 467 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
468 | static const struct proc_ops lttng_proc_ops = { |
469 | .proc_ioctl = lttng_ioctl, | |
470 | #ifdef CONFIG_COMPAT | |
471 | .proc_compat_ioctl = lttng_ioctl, | |
472 | #endif /* CONFIG_COMPAT */ | |
473 | }; | |
474 | #else | |
475 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 476 | .owner = THIS_MODULE, |
ad1c05e1 MD |
477 | .unlocked_ioctl = lttng_ioctl, |
478 | #ifdef CONFIG_COMPAT | |
03037b98 | 479 | .compat_ioctl = lttng_ioctl, |
059de147 | 480 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 481 | }; |
059de147 | 482 | #endif |
ad1c05e1 | 483 | |
5dbbdb43 | 484 | static |
c0e31d2e | 485 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 486 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 487 | enum channel_type channel_type) |
baf20995 | 488 | { |
a90917c3 | 489 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 490 | const struct file_operations *fops = NULL; |
5dbbdb43 | 491 | const char *transport_name; |
a90917c3 | 492 | struct lttng_channel *chan; |
0c023c01 | 493 | struct lttng_event_container *container; |
c0e31d2e | 494 | struct file *chan_file; |
baf20995 | 495 | int chan_fd; |
ad1c05e1 | 496 | int ret = 0; |
baf20995 | 497 | |
4ac10b76 | 498 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
499 | if (chan_fd < 0) { |
500 | ret = chan_fd; | |
501 | goto fd_error; | |
502 | } | |
88dfd899 MD |
503 | switch (channel_type) { |
504 | case PER_CPU_CHANNEL: | |
505 | fops = <tng_channel_fops; | |
506 | break; | |
507 | case METADATA_CHANNEL: | |
508 | fops = <tng_metadata_fops; | |
509 | break; | |
510 | } | |
2470a237 | 511 | |
c0e31d2e | 512 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 513 | fops, |
03037b98 | 514 | NULL, O_RDWR); |
c0e31d2e MD |
515 | if (IS_ERR(chan_file)) { |
516 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
517 | goto file_error; |
518 | } | |
5dbbdb43 MD |
519 | switch (channel_type) { |
520 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
521 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
522 | transport_name = chan_param->overwrite ? | |
96ba7208 | 523 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
524 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
525 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
526 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
527 | } else { | |
528 | return -EINVAL; | |
529 | } | |
5dbbdb43 | 530 | break; |
5dbbdb43 | 531 | case METADATA_CHANNEL: |
6dccd6c1 | 532 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 533 | transport_name = "relay-metadata"; |
6dccd6c1 | 534 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
535 | transport_name = "relay-metadata-mmap"; |
536 | else | |
537 | return -EINVAL; | |
5dbbdb43 MD |
538 | break; |
539 | default: | |
540 | transport_name = "<unknown>"; | |
541 | break; | |
542 | } | |
98d7281c MJ |
543 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
544 | ret = -EOVERFLOW; | |
9c1f4643 MD |
545 | goto refcount_error; |
546 | } | |
03037b98 MD |
547 | /* |
548 | * We tolerate no failure path after channel creation. It will stay | |
549 | * invariant for the rest of the session. | |
550 | */ | |
a90917c3 | 551 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
552 | chan_param->subbuf_size, |
553 | chan_param->num_subbuf, | |
554 | chan_param->switch_timer_interval, | |
d83004aa JD |
555 | chan_param->read_timer_interval, |
556 | channel_type); | |
03037b98 | 557 | if (!chan) { |
f3d01b96 | 558 | ret = -EINVAL; |
03037b98 MD |
559 | goto chan_error; |
560 | } | |
0c023c01 MD |
561 | container = lttng_channel_get_event_container(chan); |
562 | container->file = chan_file; | |
c0e31d2e MD |
563 | chan_file->private_data = chan; |
564 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 565 | |
baf20995 MD |
566 | return chan_fd; |
567 | ||
03037b98 | 568 | chan_error: |
9c1f4643 MD |
569 | atomic_long_dec(&session_file->f_count); |
570 | refcount_error: | |
c0e31d2e | 571 | fput(chan_file); |
baf20995 MD |
572 | file_error: |
573 | put_unused_fd(chan_fd); | |
574 | fd_error: | |
baf20995 MD |
575 | return ret; |
576 | } | |
577 | ||
7f859fbf JR |
578 | static |
579 | int lttng_abi_session_set_name(struct lttng_session *session, | |
580 | struct lttng_kernel_session_name *name) | |
581 | { | |
582 | size_t len; | |
583 | ||
584 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
585 | ||
586 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
587 | /* Name is too long/malformed */ | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | strcpy(session->name, name->name); | |
592 | return 0; | |
593 | } | |
594 | ||
1c88f269 JR |
595 | static |
596 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
597 | struct lttng_kernel_session_creation_time *time) | |
598 | { | |
599 | size_t len; | |
600 | ||
601 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
602 | ||
603 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
604 | /* Time is too long/malformed */ | |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | strcpy(session->creation_time, time->iso8601); | |
609 | return 0; | |
610 | } | |
611 | ||
0c023c01 MD |
612 | static |
613 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
614 | { | |
615 | /* Limit ABI to implemented features. */ | |
616 | switch (event_param->instrumentation) { | |
617 | case LTTNG_KERNEL_SYSCALL: | |
618 | switch (event_param->u.syscall.entryexit) { | |
619 | case LTTNG_KERNEL_SYSCALL_ENTRY: | |
620 | case LTTNG_KERNEL_SYSCALL_EXIT: | |
621 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
622 | break; | |
623 | default: | |
624 | return -EINVAL; | |
625 | } | |
626 | switch (event_param->u.syscall.abi) { | |
627 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
628 | break; | |
629 | default: | |
630 | return -EINVAL; | |
631 | } | |
632 | switch (event_param->u.syscall.match) { | |
633 | case LTTNG_KERNEL_SYSCALL_MATCH_NAME: | |
634 | break; | |
635 | default: | |
636 | return -EINVAL; | |
637 | } | |
638 | break; | |
639 | ||
640 | case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */ | |
641 | case LTTNG_KERNEL_KPROBE: /* Fallthrough */ | |
642 | case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */ | |
643 | case LTTNG_KERNEL_NOOP: /* Fallthrough */ | |
644 | case LTTNG_KERNEL_UPROBE: | |
645 | break; | |
646 | ||
647 | case LTTNG_KERNEL_FUNCTION: /* Fallthrough */ | |
648 | default: | |
649 | return -EINVAL; | |
650 | } | |
651 | return 0; | |
652 | } | |
653 | ||
654 | static | |
655 | int lttng_abi_create_event(struct file *event_container_file, | |
656 | struct lttng_event_container *container, | |
657 | struct lttng_kernel_event *event_param, | |
658 | const struct lttng_counter_key *key) | |
659 | { | |
660 | int event_fd, ret; | |
661 | struct file *event_file; | |
662 | void *priv; | |
663 | ||
664 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
665 | switch (event_param->instrumentation) { | |
666 | case LTTNG_KERNEL_KRETPROBE: | |
667 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
668 | break; | |
669 | case LTTNG_KERNEL_KPROBE: | |
670 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
671 | break; | |
672 | case LTTNG_KERNEL_FUNCTION: | |
673 | WARN_ON_ONCE(1); | |
674 | /* Not implemented. */ | |
675 | break; | |
676 | default: | |
677 | break; | |
678 | } | |
679 | event_fd = lttng_get_unused_fd(); | |
680 | if (event_fd < 0) { | |
681 | ret = event_fd; | |
682 | goto fd_error; | |
683 | } | |
684 | event_file = anon_inode_getfile("[lttng_event]", | |
685 | <tng_event_fops, | |
686 | NULL, O_RDWR); | |
687 | if (IS_ERR(event_file)) { | |
688 | ret = PTR_ERR(event_file); | |
689 | goto file_error; | |
690 | } | |
691 | /* The event holds a reference on the container */ | |
692 | if (!atomic_long_add_unless(&event_container_file->f_count, 1, LONG_MAX)) { | |
693 | ret = -EOVERFLOW; | |
694 | goto refcount_error; | |
695 | } | |
696 | ret = lttng_abi_validate_event_param(event_param); | |
697 | if (ret) | |
698 | goto event_error; | |
699 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT | |
700 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
701 | struct lttng_event_enabler *event_enabler; | |
702 | ||
703 | if (strutils_is_star_glob_pattern(event_param->name)) { | |
704 | /* | |
705 | * If the event name is a star globbing pattern, | |
706 | * we create the special star globbing enabler. | |
707 | */ | |
708 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
709 | event_param, key, container); | |
710 | } else { | |
711 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
712 | event_param, key, container); | |
713 | } | |
714 | priv = event_enabler; | |
715 | } else { | |
716 | struct lttng_event *event; | |
717 | ||
718 | /* | |
719 | * We tolerate no failure path after event creation. It | |
720 | * will stay invariant for the rest of the session. | |
721 | */ | |
722 | event = lttng_event_create(container, event_param, key, | |
723 | NULL, NULL, | |
724 | event_param->instrumentation, event_param->token); | |
725 | if (IS_ERR(event)) { | |
726 | ret = PTR_ERR(event); | |
727 | goto event_error; | |
728 | } | |
729 | priv = event; | |
730 | } | |
731 | event_file->private_data = priv; | |
732 | fd_install(event_fd, event_file); | |
733 | return event_fd; | |
734 | ||
735 | event_error: | |
736 | atomic_long_dec(&event_container_file->f_count); | |
737 | refcount_error: | |
738 | fput(event_file); | |
739 | file_error: | |
740 | put_unused_fd(event_fd); | |
741 | fd_error: | |
742 | return ret; | |
743 | } | |
744 | ||
99f52fcc FD |
745 | static |
746 | int lttng_counter_release(struct inode *inode, struct file *file) | |
747 | { | |
748 | struct lttng_counter *counter = file->private_data; | |
749 | ||
750 | if (counter) { | |
751 | /* | |
752 | * Do not destroy the counter itself. Wait of the owner | |
753 | * (event_notifier group) to be destroyed. | |
754 | */ | |
755 | fput(counter->owner); | |
756 | } | |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
0c023c01 MD |
761 | static |
762 | int copy_counter_key(struct lttng_counter_key *key, | |
763 | const struct lttng_kernel_counter_key *ukey) | |
764 | { | |
765 | size_t i, j, nr_dimensions; | |
766 | ||
767 | nr_dimensions = ukey->nr_dimensions; | |
768 | if (nr_dimensions > LTTNG_COUNTER_DIMENSION_MAX) | |
769 | return -EINVAL; | |
770 | key->nr_dimensions = nr_dimensions; | |
771 | for (i = 0; i < nr_dimensions; i++) { | |
772 | const struct lttng_kernel_counter_key_dimension *udim = | |
773 | &ukey->key_dimensions[i]; | |
774 | struct lttng_counter_key_dimension *dim = | |
775 | &key->key_dimensions[i]; | |
776 | size_t nr_key_tokens; | |
777 | ||
778 | nr_key_tokens = udim->nr_key_tokens; | |
779 | if (!nr_key_tokens || nr_key_tokens > LTTNG_NR_KEY_TOKEN) | |
780 | return -EINVAL; | |
781 | dim->nr_key_tokens = nr_key_tokens; | |
782 | for (j = 0; j < nr_key_tokens; j++) { | |
783 | const struct lttng_kernel_key_token *utoken = | |
784 | &udim->key_tokens[j]; | |
785 | struct lttng_key_token *token = | |
786 | &dim->key_tokens[j]; | |
787 | ||
788 | switch (utoken->type) { | |
789 | case LTTNG_KERNEL_KEY_TOKEN_STRING: | |
790 | { | |
791 | long ret; | |
792 | ||
793 | token->type = LTTNG_KEY_TOKEN_STRING; | |
794 | ret = strncpy_from_user(token->arg.string, | |
795 | (char __user *)(unsigned long)utoken->arg.string_ptr, | |
796 | LTTNG_KEY_TOKEN_STRING_LEN_MAX); | |
797 | if (ret < 0) | |
798 | return -EFAULT; | |
799 | if (!ret || ret == LTTNG_KEY_TOKEN_STRING_LEN_MAX) | |
800 | return -EINVAL; | |
801 | break; | |
802 | } | |
803 | case LTTNG_KERNEL_KEY_TOKEN_EVENT_NAME: | |
804 | token->type = LTTNG_KEY_TOKEN_EVENT_NAME; | |
805 | break; | |
806 | case LTTNG_KERNEL_KEY_TOKEN_PROVIDER_NAME: | |
807 | printk(KERN_ERR "LTTng: Provider name token not supported.\n"); | |
808 | /* Fallthrough */ | |
809 | default: | |
810 | return -EINVAL; | |
811 | } | |
812 | } | |
813 | } | |
814 | return 0; | |
815 | } | |
816 | ||
99f52fcc FD |
817 | static |
818 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
819 | { | |
820 | struct lttng_counter *counter = file->private_data; | |
0c023c01 | 821 | struct lttng_event_container *container = lttng_counter_get_event_container(counter); |
99f52fcc FD |
822 | size_t indexes[LTTNG_KERNEL_COUNTER_DIMENSION_MAX] = { 0 }; |
823 | int i; | |
824 | ||
825 | switch (cmd) { | |
826 | case LTTNG_KERNEL_COUNTER_READ: | |
827 | { | |
828 | struct lttng_kernel_counter_read local_counter_read; | |
829 | struct lttng_kernel_counter_read __user *ucounter_read = | |
830 | (struct lttng_kernel_counter_read __user *) arg; | |
831 | bool overflow, underflow; | |
832 | int64_t value; | |
833 | int32_t cpu; | |
834 | int ret; | |
835 | ||
836 | if (copy_from_user(&local_counter_read, ucounter_read, | |
837 | sizeof(local_counter_read))) | |
838 | return -EFAULT; | |
839 | if (validate_zeroed_padding(local_counter_read.padding, | |
840 | sizeof(local_counter_read.padding))) | |
841 | return -EINVAL; | |
842 | ||
843 | /* Cast all indexes into size_t. */ | |
844 | for (i = 0; i < local_counter_read.index.number_dimensions; i++) | |
845 | indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i]; | |
846 | cpu = local_counter_read.cpu; | |
847 | ||
848 | ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, | |
849 | &overflow, &underflow); | |
850 | if (ret) | |
851 | return ret; | |
852 | local_counter_read.value.value = value; | |
853 | local_counter_read.value.overflow = overflow; | |
854 | local_counter_read.value.underflow = underflow; | |
855 | ||
856 | if (copy_to_user(&ucounter_read->value, &local_counter_read.value, | |
857 | sizeof(local_counter_read.value))) | |
858 | return -EFAULT; | |
859 | ||
860 | return 0; | |
861 | } | |
862 | case LTTNG_KERNEL_COUNTER_AGGREGATE: | |
863 | { | |
864 | struct lttng_kernel_counter_aggregate local_counter_aggregate; | |
865 | struct lttng_kernel_counter_aggregate __user *ucounter_aggregate = | |
866 | (struct lttng_kernel_counter_aggregate __user *) arg; | |
867 | bool overflow, underflow; | |
868 | int64_t value; | |
869 | int ret; | |
870 | ||
871 | if (copy_from_user(&local_counter_aggregate, ucounter_aggregate, | |
872 | sizeof(local_counter_aggregate))) | |
873 | return -EFAULT; | |
874 | if (validate_zeroed_padding(local_counter_aggregate.padding, | |
875 | sizeof(local_counter_aggregate.padding))) | |
876 | return -EINVAL; | |
877 | ||
878 | /* Cast all indexes into size_t. */ | |
879 | for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++) | |
880 | indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i]; | |
881 | ||
882 | ret = lttng_kernel_counter_aggregate(counter, indexes, &value, | |
883 | &overflow, &underflow); | |
884 | if (ret) | |
885 | return ret; | |
886 | local_counter_aggregate.value.value = value; | |
887 | local_counter_aggregate.value.overflow = overflow; | |
888 | local_counter_aggregate.value.underflow = underflow; | |
889 | ||
890 | if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value, | |
891 | sizeof(local_counter_aggregate.value))) | |
892 | return -EFAULT; | |
893 | ||
894 | return 0; | |
895 | } | |
896 | case LTTNG_KERNEL_COUNTER_CLEAR: | |
897 | { | |
898 | struct lttng_kernel_counter_clear local_counter_clear; | |
899 | struct lttng_kernel_counter_clear __user *ucounter_clear = | |
900 | (struct lttng_kernel_counter_clear __user *) arg; | |
901 | ||
902 | if (copy_from_user(&local_counter_clear, ucounter_clear, | |
903 | sizeof(local_counter_clear))) | |
904 | return -EFAULT; | |
905 | if (validate_zeroed_padding(local_counter_clear.padding, | |
906 | sizeof(local_counter_clear.padding))) | |
907 | return -EINVAL; | |
908 | ||
909 | /* Cast all indexes into size_t. */ | |
910 | for (i = 0; i < local_counter_clear.index.number_dimensions; i++) | |
911 | indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i]; | |
912 | ||
913 | return lttng_kernel_counter_clear(counter, indexes); | |
914 | } | |
0c023c01 MD |
915 | case LTTNG_KERNEL_COUNTER_EVENT: |
916 | { | |
917 | struct lttng_kernel_counter_event *ucounter_event_param; | |
918 | struct lttng_counter_key *key; | |
919 | int ret; | |
920 | ||
921 | key = kzalloc(sizeof(*key), GFP_KERNEL); | |
922 | if (!key) | |
923 | return -ENOMEM; | |
924 | ucounter_event_param = kzalloc(sizeof(*ucounter_event_param), GFP_KERNEL); | |
925 | if (!ucounter_event_param) { | |
926 | ret = -ENOMEM; | |
927 | goto free_key; | |
928 | } | |
929 | if (copy_from_user(ucounter_event_param, | |
930 | (struct lttng_kernel_counter_event __user *) arg, | |
931 | sizeof(*ucounter_event_param))) { | |
932 | ret = -EFAULT; | |
933 | goto free_param; | |
934 | } | |
935 | ret = copy_counter_key(key, &ucounter_event_param->key); | |
936 | if (ret) | |
937 | goto free_param; | |
938 | ret = lttng_abi_create_event(file, container, &ucounter_event_param->event, key); | |
939 | free_param: | |
940 | kfree(ucounter_event_param); | |
941 | free_key: | |
942 | kfree(key); | |
943 | return ret; | |
944 | } | |
945 | case LTTNG_KERNEL_ENABLE: | |
946 | return lttng_event_container_enable(container); | |
947 | case LTTNG_KERNEL_DISABLE: | |
948 | return lttng_event_container_disable(container); | |
949 | case LTTNG_KERNEL_SYSCALL_MASK: | |
950 | return lttng_event_container_syscall_mask(container, | |
951 | (struct lttng_kernel_syscall_mask __user *) arg); | |
952 | case LTTNG_KERNEL_COUNTER_MAP_NR_DESCRIPTORS: | |
953 | { | |
954 | uint64_t __user *user_nr_descriptors = (uint64_t __user *) arg; | |
955 | uint64_t nr_descriptors; | |
956 | ||
957 | mutex_lock(&counter->map.lock); | |
958 | nr_descriptors = counter->map.nr_descriptors; | |
959 | mutex_unlock(&counter->map.lock); | |
960 | return put_user(nr_descriptors, user_nr_descriptors); | |
961 | } | |
962 | case LTTNG_KERNEL_COUNTER_MAP_DESCRIPTOR: | |
963 | { | |
964 | struct lttng_kernel_counter_map_descriptor __user *user_descriptor = | |
965 | (struct lttng_kernel_counter_map_descriptor __user *) arg; | |
966 | struct lttng_kernel_counter_map_descriptor local_descriptor; | |
967 | struct lttng_counter_map_descriptor *kernel_descriptor; | |
968 | int ret; | |
969 | ||
970 | if (copy_from_user(&local_descriptor, user_descriptor, | |
971 | sizeof(local_descriptor))) | |
972 | return -EFAULT; | |
973 | if (validate_zeroed_padding(local_descriptor.padding, | |
974 | sizeof(local_descriptor.padding))) | |
975 | return -EINVAL; | |
976 | ||
977 | mutex_lock(&counter->map.lock); | |
978 | if (local_descriptor.descriptor_index >= counter->map.nr_descriptors) { | |
979 | ret = -EOVERFLOW; | |
980 | goto map_descriptor_error_unlock; | |
981 | } | |
982 | kernel_descriptor = &counter->map.descriptors[local_descriptor.descriptor_index]; | |
983 | local_descriptor.user_token = kernel_descriptor->user_token; | |
984 | local_descriptor.array_index = kernel_descriptor->array_index; | |
985 | memcpy(local_descriptor.key, kernel_descriptor->key, LTTNG_KERNEL_COUNTER_KEY_LEN); | |
986 | mutex_unlock(&counter->map.lock); | |
987 | ||
988 | if (copy_to_user(user_descriptor, &local_descriptor, | |
989 | sizeof(local_descriptor))) | |
990 | return -EFAULT; | |
991 | ||
992 | return 0; | |
993 | ||
994 | map_descriptor_error_unlock: | |
995 | mutex_unlock(&counter->map.lock); | |
996 | return ret; | |
997 | } | |
99f52fcc FD |
998 | default: |
999 | WARN_ON_ONCE(1); | |
1000 | return -ENOSYS; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | static const struct file_operations lttng_counter_fops = { | |
1005 | .owner = THIS_MODULE, | |
1006 | .release = lttng_counter_release, | |
1007 | .unlocked_ioctl = lttng_counter_ioctl, | |
1008 | #ifdef CONFIG_COMPAT | |
1009 | .compat_ioctl = lttng_counter_ioctl, | |
1010 | #endif | |
1011 | }; | |
1012 | ||
0c023c01 MD |
1013 | static |
1014 | long lttng_abi_session_create_counter( | |
1015 | struct lttng_session *session, | |
1016 | const struct lttng_kernel_counter_conf *counter_conf) | |
1017 | { | |
1018 | int counter_fd, ret, i; | |
1019 | char *counter_transport_name; | |
1020 | struct lttng_event_container *container; | |
1021 | struct lttng_counter *counter; | |
1022 | struct file *counter_file; | |
1023 | size_t dimension_sizes[LTTNG_KERNEL_COUNTER_DIMENSION_MAX] = { 0 }; | |
1024 | size_t number_dimensions; | |
1025 | ||
1026 | counter_fd = lttng_get_unused_fd(); | |
1027 | if (counter_fd < 0) { | |
1028 | ret = counter_fd; | |
1029 | goto fd_error; | |
1030 | } | |
1031 | ||
1032 | counter_file = anon_inode_getfile("[lttng_counter]", | |
1033 | <tng_counter_fops, | |
1034 | NULL, O_RDONLY); | |
1035 | if (IS_ERR(counter_file)) { | |
1036 | ret = PTR_ERR(counter_file); | |
1037 | goto file_error; | |
1038 | } | |
1039 | ||
1040 | if (counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) { | |
1041 | printk(KERN_ERR "LTTng: Map: Error counter of the wrong type.\n"); | |
1042 | return -EINVAL; | |
1043 | } | |
1044 | ||
1045 | switch (counter_conf->bitness) { | |
1046 | case LTTNG_KERNEL_COUNTER_BITNESS_64: | |
1047 | counter_transport_name = "counter-per-cpu-64-modular"; | |
1048 | break; | |
1049 | case LTTNG_KERNEL_COUNTER_BITNESS_32: | |
1050 | counter_transport_name = "counter-per-cpu-32-modular"; | |
1051 | break; | |
1052 | default: | |
1053 | return -EINVAL; | |
1054 | } | |
1055 | ||
1056 | number_dimensions = (size_t) counter_conf->number_dimensions; | |
1057 | ||
1058 | for (i = 0; i < counter_conf->number_dimensions; i++) { | |
1059 | if (counter_conf->dimensions[i].has_underflow) | |
1060 | return -EINVAL; | |
1061 | if (counter_conf->dimensions[i].has_overflow) | |
1062 | return -EINVAL; | |
1063 | dimension_sizes[i] = counter_conf->dimensions[i].size; | |
1064 | } | |
1065 | ||
1066 | if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) { | |
1067 | ret = -EOVERFLOW; | |
1068 | goto refcount_error; | |
1069 | } | |
1070 | ||
1071 | counter = lttng_session_create_counter(session, | |
1072 | counter_transport_name, | |
1073 | number_dimensions, dimension_sizes, | |
1074 | counter_conf->coalesce_hits); | |
1075 | if (!counter) { | |
1076 | ret = -EINVAL; | |
1077 | goto counter_error; | |
1078 | } | |
1079 | ||
1080 | counter->owner = session->file; | |
1081 | container = lttng_counter_get_event_container(counter); | |
1082 | container->file = counter_file; | |
1083 | counter_file->private_data = counter; | |
1084 | ||
1085 | fd_install(counter_fd, counter_file); | |
1086 | ||
1087 | return counter_fd; | |
1088 | ||
1089 | counter_error: | |
1090 | atomic_long_dec(&session->file->f_count); | |
1091 | refcount_error: | |
1092 | fput(counter_file); | |
1093 | file_error: | |
1094 | put_unused_fd(counter_fd); | |
1095 | fd_error: | |
1096 | return ret; | |
1097 | } | |
99f52fcc | 1098 | |
d1f652f8 MD |
1099 | static |
1100 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
1101 | { | |
1102 | switch (tracker->type) { | |
1103 | case LTTNG_KERNEL_TRACKER_PID: | |
1104 | return TRACKER_PID; | |
1105 | case LTTNG_KERNEL_TRACKER_VPID: | |
1106 | return TRACKER_VPID; | |
1107 | case LTTNG_KERNEL_TRACKER_UID: | |
1108 | return TRACKER_UID; | |
1109 | case LTTNG_KERNEL_TRACKER_VUID: | |
1110 | return TRACKER_VUID; | |
1111 | case LTTNG_KERNEL_TRACKER_GID: | |
1112 | return TRACKER_GID; | |
1113 | case LTTNG_KERNEL_TRACKER_VGID: | |
1114 | return TRACKER_VGID; | |
1115 | default: | |
1116 | return TRACKER_UNKNOWN; | |
1117 | } | |
1118 | } | |
1119 | ||
baf20995 | 1120 | /** |
ad1c05e1 | 1121 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 1122 | * |
c0e31d2e | 1123 | * @file: the file |
baf20995 MD |
1124 | * @cmd: the command |
1125 | * @arg: command arg | |
1126 | * | |
1127 | * This ioctl implements lttng commands: | |
38d024ae | 1128 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 1129 | * Returns a LTTng channel file descriptor |
e64957da MD |
1130 | * LTTNG_KERNEL_ENABLE |
1131 | * Enables tracing for a session (weak enable) | |
1132 | * LTTNG_KERNEL_DISABLE | |
1133 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
1134 | * LTTNG_KERNEL_METADATA |
1135 | * Returns a LTTng metadata file descriptor | |
e0130fab | 1136 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 1137 | * Add PID to session PID tracker |
e0130fab | 1138 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
1139 | * Remove PID from session PID tracker |
1140 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
1141 | * Add ID to tracker | |
1142 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
1143 | * Remove ID from tracker | |
ad1c05e1 MD |
1144 | * |
1145 | * The returned channel will be deleted when its file descriptor is closed. | |
1146 | */ | |
1147 | static | |
c0e31d2e | 1148 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 1149 | { |
a90917c3 | 1150 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
1151 | struct lttng_kernel_channel chan_param; |
1152 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 1153 | |
ad1c05e1 | 1154 | switch (cmd) { |
6dccd6c1 JD |
1155 | case LTTNG_KERNEL_OLD_CHANNEL: |
1156 | { | |
6dccd6c1 JD |
1157 | if (copy_from_user(&old_chan_param, |
1158 | (struct lttng_kernel_old_channel __user *) arg, | |
1159 | sizeof(struct lttng_kernel_old_channel))) | |
1160 | return -EFAULT; | |
1161 | chan_param.overwrite = old_chan_param.overwrite; | |
1162 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
1163 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
1164 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
1165 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
1166 | chan_param.output = old_chan_param.output; | |
1167 | ||
1168 | return lttng_abi_create_channel(file, &chan_param, | |
1169 | PER_CPU_CHANNEL); | |
1170 | } | |
38d024ae | 1171 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 1172 | { |
6dccd6c1 | 1173 | if (copy_from_user(&chan_param, |
38d024ae | 1174 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
1175 | sizeof(struct lttng_kernel_channel))) |
1176 | return -EFAULT; | |
1177 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 1178 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
1179 | } |
1180 | case LTTNG_KERNEL_OLD_SESSION_START: | |
1181 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 1182 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 1183 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1184 | return lttng_session_enable(session); |
6dccd6c1 JD |
1185 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
1186 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 1187 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 1188 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1189 | return lttng_session_disable(session); |
6dccd6c1 JD |
1190 | case LTTNG_KERNEL_OLD_METADATA: |
1191 | { | |
6dccd6c1 JD |
1192 | if (copy_from_user(&old_chan_param, |
1193 | (struct lttng_kernel_old_channel __user *) arg, | |
1194 | sizeof(struct lttng_kernel_old_channel))) | |
1195 | return -EFAULT; | |
1196 | chan_param.overwrite = old_chan_param.overwrite; | |
1197 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
1198 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
1199 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
1200 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
1201 | chan_param.output = old_chan_param.output; | |
1202 | ||
1203 | return lttng_abi_create_channel(file, &chan_param, | |
1204 | METADATA_CHANNEL); | |
1205 | } | |
38d024ae | 1206 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 1207 | { |
6dccd6c1 JD |
1208 | if (copy_from_user(&chan_param, |
1209 | (struct lttng_kernel_channel __user *) arg, | |
1210 | sizeof(struct lttng_kernel_channel))) | |
1211 | return -EFAULT; | |
1212 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 1213 | METADATA_CHANNEL); |
6dccd6c1 | 1214 | } |
e0130fab | 1215 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 1216 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 1217 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
1218 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
1219 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
1220 | { | |
1221 | struct lttng_kernel_tracker_args tracker; | |
1222 | enum tracker_type tracker_type; | |
1223 | ||
1224 | if (copy_from_user(&tracker, | |
1225 | (struct lttng_kernel_tracker_args __user *) arg, | |
1226 | sizeof(struct lttng_kernel_tracker_args))) | |
1227 | return -EFAULT; | |
1228 | tracker_type = get_tracker_type(&tracker); | |
1229 | if (tracker_type == TRACKER_UNKNOWN) | |
1230 | return -EINVAL; | |
1231 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
1232 | } | |
1233 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
1234 | { | |
1235 | struct lttng_kernel_tracker_args tracker; | |
1236 | enum tracker_type tracker_type; | |
1237 | ||
1238 | if (copy_from_user(&tracker, | |
1239 | (struct lttng_kernel_tracker_args __user *) arg, | |
1240 | sizeof(struct lttng_kernel_tracker_args))) | |
1241 | return -EFAULT; | |
1242 | tracker_type = get_tracker_type(&tracker); | |
1243 | if (tracker_type == TRACKER_UNKNOWN) | |
1244 | return -EINVAL; | |
1245 | return lttng_session_untrack_id(session, tracker_type, | |
1246 | tracker.id); | |
1247 | } | |
7e6f9ef6 | 1248 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
1249 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
1250 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
1251 | { | |
1252 | struct lttng_kernel_tracker_args tracker; | |
1253 | enum tracker_type tracker_type; | |
1254 | ||
1255 | if (copy_from_user(&tracker, | |
1256 | (struct lttng_kernel_tracker_args __user *) arg, | |
1257 | sizeof(struct lttng_kernel_tracker_args))) | |
1258 | return -EFAULT; | |
1259 | tracker_type = get_tracker_type(&tracker); | |
1260 | if (tracker_type == TRACKER_UNKNOWN) | |
1261 | return -EINVAL; | |
1262 | return lttng_session_list_tracker_ids(session, tracker_type); | |
1263 | } | |
9616f0bf JD |
1264 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
1265 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
1266 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
1267 | return lttng_session_statedump(session); | |
7f859fbf JR |
1268 | case LTTNG_KERNEL_SESSION_SET_NAME: |
1269 | { | |
1270 | struct lttng_kernel_session_name name; | |
1271 | ||
1272 | if (copy_from_user(&name, | |
1273 | (struct lttng_kernel_session_name __user *) arg, | |
1274 | sizeof(struct lttng_kernel_session_name))) | |
1275 | return -EFAULT; | |
1276 | return lttng_abi_session_set_name(session, &name); | |
1277 | } | |
1c88f269 JR |
1278 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
1279 | { | |
1280 | struct lttng_kernel_session_creation_time time; | |
1281 | ||
1282 | if (copy_from_user(&time, | |
1283 | (struct lttng_kernel_session_creation_time __user *) arg, | |
1284 | sizeof(struct lttng_kernel_session_creation_time))) | |
1285 | return -EFAULT; | |
1286 | return lttng_abi_session_set_creation_time(session, &time); | |
1287 | } | |
0c023c01 MD |
1288 | case LTTNG_KERNEL_COUNTER: |
1289 | { | |
1290 | struct lttng_kernel_counter_conf ucounter_conf; | |
1291 | ||
1292 | if (copy_from_user(&ucounter_conf, | |
1293 | (struct lttng_kernel_counter_conf __user *) arg, | |
1294 | sizeof(ucounter_conf))) | |
1295 | return -EFAULT; | |
1296 | return lttng_abi_session_create_counter(session, | |
1297 | &ucounter_conf); | |
1298 | } | |
ad1c05e1 MD |
1299 | default: |
1300 | return -ENOIOCTLCMD; | |
1301 | } | |
1302 | } | |
1303 | ||
03037b98 MD |
1304 | /* |
1305 | * Called when the last file reference is dropped. | |
1306 | * | |
1307 | * Big fat note: channels and events are invariant for the whole session after | |
1308 | * their creation. So this session destruction also destroys all channel and | |
1309 | * event structures specific to this session (they are not destroyed when their | |
1310 | * individual file is released). | |
1311 | */ | |
ad1c05e1 | 1312 | static |
03037b98 | 1313 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 1314 | { |
a90917c3 | 1315 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
1316 | |
1317 | if (session) | |
a90917c3 | 1318 | lttng_session_destroy(session); |
11b5a3c2 | 1319 | return 0; |
ad1c05e1 | 1320 | } |
ad1c05e1 MD |
1321 | |
1322 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 1323 | .owner = THIS_MODULE, |
03037b98 | 1324 | .release = lttng_session_release, |
ad1c05e1 MD |
1325 | .unlocked_ioctl = lttng_session_ioctl, |
1326 | #ifdef CONFIG_COMPAT | |
03037b98 | 1327 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 1328 | #endif |
11b5a3c2 | 1329 | }; |
ad1c05e1 | 1330 | |
db2511b4 MD |
1331 | /* |
1332 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
1333 | * and retry (if new data available to read after flush). | |
1334 | */ | |
1335 | static | |
1336 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
1337 | size_t count, loff_t *ppos) | |
1338 | { | |
1339 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
1340 | struct channel *chan = event_notifier_group->chan; | |
1341 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1342 | ssize_t read_count = 0, len; | |
1343 | size_t read_offset; | |
1344 | ||
1345 | might_sleep(); | |
1346 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
1347 | return -EFAULT; | |
1348 | ||
1349 | /* Finish copy of previous record */ | |
1350 | if (*ppos != 0) { | |
1351 | if (read_count < count) { | |
1352 | len = chan->iter.len_left; | |
1353 | read_offset = *ppos; | |
1354 | goto skip_get_next; | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | while (read_count < count) { | |
1359 | size_t copy_len, space_left; | |
1360 | ||
1361 | len = lib_ring_buffer_get_next_record(chan, buf); | |
1362 | len_test: | |
1363 | if (len < 0) { | |
1364 | /* | |
1365 | * Check if buffer is finalized (end of file). | |
1366 | */ | |
1367 | if (len == -ENODATA) { | |
1368 | /* A 0 read_count will tell about end of file */ | |
1369 | goto nodata; | |
1370 | } | |
1371 | if (filp->f_flags & O_NONBLOCK) { | |
1372 | if (!read_count) | |
1373 | read_count = -EAGAIN; | |
1374 | goto nodata; | |
1375 | } else { | |
1376 | int error; | |
1377 | ||
1378 | /* | |
1379 | * No data available at the moment, return what | |
1380 | * we got. | |
1381 | */ | |
1382 | if (read_count) | |
1383 | goto nodata; | |
1384 | ||
1385 | /* | |
1386 | * Wait for returned len to be >= 0 or -ENODATA. | |
1387 | */ | |
1388 | error = wait_event_interruptible( | |
1389 | event_notifier_group->read_wait, | |
1390 | ((len = lib_ring_buffer_get_next_record( | |
1391 | chan, buf)), len != -EAGAIN)); | |
1392 | CHAN_WARN_ON(chan, len == -EBUSY); | |
1393 | if (error) { | |
1394 | read_count = error; | |
1395 | goto nodata; | |
1396 | } | |
1397 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
1398 | goto len_test; | |
1399 | } | |
1400 | } | |
1401 | read_offset = buf->iter.read_offset; | |
1402 | skip_get_next: | |
1403 | space_left = count - read_count; | |
1404 | if (len <= space_left) { | |
1405 | copy_len = len; | |
1406 | chan->iter.len_left = 0; | |
1407 | *ppos = 0; | |
1408 | } else { | |
1409 | copy_len = space_left; | |
1410 | chan->iter.len_left = len - copy_len; | |
1411 | *ppos = read_offset + copy_len; | |
1412 | } | |
1413 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
1414 | &user_buf[read_count], | |
1415 | copy_len)) { | |
1416 | /* | |
1417 | * Leave the len_left and ppos values at their current | |
1418 | * state, as we currently have a valid event to read. | |
1419 | */ | |
1420 | return -EFAULT; | |
1421 | } | |
1422 | read_count += copy_len; | |
1423 | } | |
31c02fb7 | 1424 | goto put_record; |
db2511b4 MD |
1425 | |
1426 | nodata: | |
1427 | *ppos = 0; | |
1428 | chan->iter.len_left = 0; | |
31c02fb7 MD |
1429 | |
1430 | put_record: | |
1431 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1432 | return read_count; |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1437 | * there is data available. Perform a ring buffer flush if we encounter a | |
1438 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1439 | */ | |
1440 | static | |
1441 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1442 | poll_table *wait) | |
1443 | { | |
1444 | unsigned int mask = 0; | |
1445 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
1446 | struct channel *chan = event_notifier_group->chan; | |
1447 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1448 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1449 | int finalized, disabled; | |
1450 | unsigned long consumed, offset; | |
18f12d55 | 1451 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1452 | |
1453 | if (filp->f_mode & FMODE_READ) { | |
1454 | poll_wait_set_exclusive(wait); | |
1455 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1456 | ||
1457 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1458 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1459 | ||
1460 | /* | |
1461 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1462 | * finalized load before offsets loads. | |
1463 | */ | |
1464 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1465 | retry: | |
1466 | if (disabled) | |
1467 | return POLLERR; | |
1468 | ||
1469 | offset = lib_ring_buffer_get_offset(config, buf); | |
1470 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1471 | ||
1472 | /* | |
1473 | * If there is no buffer available to consume. | |
1474 | */ | |
1475 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1476 | /* | |
1477 | * If there is a non-empty subbuffer, flush and try again. | |
1478 | */ | |
18f12d55 | 1479 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1480 | lib_ring_buffer_switch_remote(buf); |
1481 | goto retry; | |
1482 | } | |
1483 | ||
1484 | if (finalized) | |
1485 | return POLLHUP; | |
1486 | else { | |
1487 | /* | |
1488 | * The memory barriers | |
1489 | * __wait_event()/wake_up_interruptible() take | |
1490 | * care of "raw_spin_is_locked" memory ordering. | |
1491 | */ | |
1492 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1493 | goto retry; | |
1494 | else | |
1495 | return 0; | |
1496 | } | |
1497 | } else { | |
1498 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1499 | >= chan->backend.buf_size) | |
1500 | return POLLPRI | POLLRDBAND; | |
1501 | else | |
1502 | return POLLIN | POLLRDNORM; | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | return mask; | |
1507 | } | |
1508 | ||
1509 | /** | |
1510 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1511 | * @inode: opened inode | |
1512 | * @file: opened file | |
1513 | * | |
1514 | * Open implementation. Makes sure only one open instance of a buffer is | |
1515 | * done at a given moment. | |
1516 | */ | |
1517 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1518 | { | |
1519 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
1520 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1521 | ||
1522 | file->private_data = event_notifier_group; | |
1523 | return lib_ring_buffer_open(inode, file, buf); | |
1524 | } | |
1525 | ||
1526 | /** | |
1527 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1528 | * @inode: opened inode | |
1529 | * @file: opened file | |
1530 | * | |
1531 | * Release implementation. | |
1532 | */ | |
1533 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1534 | { | |
1535 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
1536 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1537 | int ret; | |
1538 | ||
1539 | ret = lib_ring_buffer_release(inode, file, buf); | |
1540 | if (ret) | |
1541 | return ret; | |
1542 | fput(event_notifier_group->file); | |
1543 | return 0; | |
1544 | } | |
1545 | ||
21f58fb7 FD |
1546 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1547 | .owner = THIS_MODULE, | |
db2511b4 MD |
1548 | .open = lttng_event_notifier_group_notif_open, |
1549 | .release = lttng_event_notifier_group_notif_release, | |
1550 | .read = lttng_event_notifier_group_notif_read, | |
1551 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1552 | }; |
1553 | ||
d83004aa JD |
1554 | /** |
1555 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1556 | * @filp: the file | |
1557 | * @wait: poll table | |
1558 | * | |
1559 | * Handles the poll operations for the metadata channels. | |
1560 | */ | |
ad1c05e1 | 1561 | static |
d83004aa JD |
1562 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1563 | poll_table *wait) | |
1564 | { | |
1565 | struct lttng_metadata_stream *stream = filp->private_data; | |
1566 | struct lib_ring_buffer *buf = stream->priv; | |
1567 | int finalized; | |
1568 | unsigned int mask = 0; | |
1569 | ||
1570 | if (filp->f_mode & FMODE_READ) { | |
1571 | poll_wait_set_exclusive(wait); | |
1572 | poll_wait(filp, &stream->read_wait, wait); | |
1573 | ||
1574 | finalized = stream->finalized; | |
1575 | ||
1576 | /* | |
1577 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1578 | * ordering finalized load before offsets loads. | |
1579 | */ | |
1580 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1581 | ||
1582 | if (finalized) | |
1583 | mask |= POLLHUP; | |
1584 | ||
92d9f5e6 | 1585 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1586 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1587 | stream->metadata_out) |
d83004aa | 1588 | mask |= POLLIN; |
92d9f5e6 | 1589 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1590 | } |
1591 | ||
1592 | return mask; | |
1593 | } | |
1594 | ||
f613e3e6 MD |
1595 | static |
1596 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1597 | unsigned int cmd, unsigned long arg) | |
1598 | { | |
1599 | struct lttng_metadata_stream *stream = filp->private_data; | |
1600 | ||
1601 | stream->metadata_out = stream->metadata_in; | |
1602 | } | |
1603 | ||
d1344afa JD |
1604 | /* |
1605 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1606 | * the consumer receives the content of the metadata cache unchanged. This is | |
1607 | * different from the metadata_regenerate where the offset from epoch is | |
1608 | * resampled, here we want the exact same content as the last time the metadata | |
1609 | * was generated. This command is only possible if all the metadata written | |
1610 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1611 | * metadata file. | |
1612 | * | |
1613 | * Return 0 on success, a negative value on error. | |
1614 | */ | |
1615 | static | |
1616 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1617 | { | |
1618 | int ret; | |
1619 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1620 | ||
1621 | mutex_lock(&cache->lock); | |
1622 | if (stream->metadata_out != cache->metadata_written) { | |
1623 | ret = -EBUSY; | |
1624 | goto end; | |
1625 | } | |
1626 | stream->metadata_out = 0; | |
1627 | stream->metadata_in = 0; | |
1628 | wake_up_interruptible(&stream->read_wait); | |
1629 | ret = 0; | |
1630 | ||
1631 | end: | |
1632 | mutex_unlock(&cache->lock); | |
1633 | return ret; | |
1634 | } | |
1635 | ||
d83004aa JD |
1636 | static |
1637 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1638 | unsigned int cmd, unsigned long arg) | |
1639 | { | |
1640 | int ret; | |
1641 | struct lttng_metadata_stream *stream = filp->private_data; | |
1642 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1643 | unsigned int rb_cmd; |
1644 | bool coherent; | |
1645 | ||
1646 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1647 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1648 | else | |
1649 | rb_cmd = cmd; | |
d83004aa JD |
1650 | |
1651 | switch (cmd) { | |
d83004aa JD |
1652 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1653 | { | |
35097f36 JD |
1654 | struct lttng_metadata_stream *stream = filp->private_data; |
1655 | struct lib_ring_buffer *buf = stream->priv; | |
1656 | struct channel *chan = buf->backend.chan; | |
1657 | ||
8b97fd42 | 1658 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1659 | if (ret > 0) { |
1660 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1661 | ret = 0; | |
1662 | } else if (ret < 0) | |
d83004aa JD |
1663 | goto err; |
1664 | break; | |
1665 | } | |
f613e3e6 MD |
1666 | case RING_BUFFER_GET_SUBBUF: |
1667 | { | |
1668 | /* | |
1669 | * Random access is not allowed for metadata channel. | |
1670 | */ | |
1671 | return -ENOSYS; | |
1672 | } | |
c6f05468 | 1673 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
1674 | case RING_BUFFER_FLUSH: |
1675 | { | |
1676 | struct lttng_metadata_stream *stream = filp->private_data; | |
1677 | struct lib_ring_buffer *buf = stream->priv; | |
1678 | struct channel *chan = buf->backend.chan; | |
1679 | ||
1680 | /* | |
1681 | * Before doing the actual ring buffer flush, write up to one | |
1682 | * packet of metadata in the ring buffer. | |
1683 | */ | |
8b97fd42 | 1684 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1685 | if (ret < 0) |
1686 | goto err; | |
1687 | break; | |
1688 | } | |
9616f0bf JD |
1689 | case RING_BUFFER_GET_METADATA_VERSION: |
1690 | { | |
1691 | struct lttng_metadata_stream *stream = filp->private_data; | |
1692 | ||
1693 | return put_u64(stream->version, arg); | |
1694 | } | |
d1344afa JD |
1695 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1696 | { | |
1697 | struct lttng_metadata_stream *stream = filp->private_data; | |
1698 | ||
1699 | return lttng_metadata_cache_dump(stream); | |
1700 | } | |
8b97fd42 MD |
1701 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1702 | { | |
1703 | struct lttng_metadata_stream *stream = filp->private_data; | |
1704 | struct lib_ring_buffer *buf = stream->priv; | |
1705 | struct channel *chan = buf->backend.chan; | |
1706 | ||
1707 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1708 | if (ret > 0) { | |
1709 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1710 | ret = 0; | |
1711 | } else if (ret < 0) { | |
1712 | goto err; | |
1713 | } | |
1714 | break; | |
1715 | } | |
d83004aa JD |
1716 | default: |
1717 | break; | |
1718 | } | |
f613e3e6 MD |
1719 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1720 | ||
d83004aa | 1721 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1722 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1723 | if (ret < 0) |
1724 | goto err; | |
d83004aa | 1725 | |
f613e3e6 MD |
1726 | switch (cmd) { |
1727 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1728 | { | |
1729 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1730 | cmd, arg); | |
1731 | break; | |
1732 | } | |
8b97fd42 MD |
1733 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1734 | { | |
1735 | return put_u32(coherent, arg); | |
1736 | } | |
f613e3e6 MD |
1737 | default: |
1738 | break; | |
1739 | } | |
d83004aa JD |
1740 | err: |
1741 | return ret; | |
1742 | } | |
1743 | ||
aeb9064d | 1744 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1745 | static |
1746 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1747 | unsigned int cmd, unsigned long arg) | |
1748 | { | |
1749 | int ret; | |
1750 | struct lttng_metadata_stream *stream = filp->private_data; | |
1751 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1752 | unsigned int rb_cmd; |
1753 | bool coherent; | |
1754 | ||
1755 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1756 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1757 | else | |
1758 | rb_cmd = cmd; | |
d83004aa JD |
1759 | |
1760 | switch (cmd) { | |
d83004aa JD |
1761 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1762 | { | |
35097f36 JD |
1763 | struct lttng_metadata_stream *stream = filp->private_data; |
1764 | struct lib_ring_buffer *buf = stream->priv; | |
1765 | struct channel *chan = buf->backend.chan; | |
1766 | ||
8b97fd42 | 1767 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1768 | if (ret > 0) { |
1769 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1770 | ret = 0; | |
1771 | } else if (ret < 0) | |
d83004aa JD |
1772 | goto err; |
1773 | break; | |
1774 | } | |
f613e3e6 MD |
1775 | case RING_BUFFER_GET_SUBBUF: |
1776 | { | |
1777 | /* | |
1778 | * Random access is not allowed for metadata channel. | |
1779 | */ | |
1780 | return -ENOSYS; | |
1781 | } | |
c6f05468 | 1782 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1783 | case RING_BUFFER_FLUSH: |
1784 | { | |
1785 | struct lttng_metadata_stream *stream = filp->private_data; | |
1786 | struct lib_ring_buffer *buf = stream->priv; | |
1787 | struct channel *chan = buf->backend.chan; | |
1788 | ||
1789 | /* | |
1790 | * Before doing the actual ring buffer flush, write up to one | |
1791 | * packet of metadata in the ring buffer. | |
1792 | */ | |
8b97fd42 | 1793 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1794 | if (ret < 0) |
1795 | goto err; | |
1796 | break; | |
1797 | } | |
1798 | case RING_BUFFER_GET_METADATA_VERSION: | |
1799 | { | |
1800 | struct lttng_metadata_stream *stream = filp->private_data; | |
1801 | ||
1802 | return put_u64(stream->version, arg); | |
1803 | } | |
d1344afa JD |
1804 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1805 | { | |
1806 | struct lttng_metadata_stream *stream = filp->private_data; | |
1807 | ||
1808 | return lttng_metadata_cache_dump(stream); | |
1809 | } | |
8b97fd42 MD |
1810 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1811 | { | |
1812 | struct lttng_metadata_stream *stream = filp->private_data; | |
1813 | struct lib_ring_buffer *buf = stream->priv; | |
1814 | struct channel *chan = buf->backend.chan; | |
1815 | ||
1816 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1817 | if (ret > 0) { | |
1818 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1819 | ret = 0; | |
1820 | } else if (ret < 0) { | |
1821 | goto err; | |
1822 | } | |
1823 | break; | |
1824 | } | |
d83004aa JD |
1825 | default: |
1826 | break; | |
1827 | } | |
f613e3e6 MD |
1828 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1829 | ||
d83004aa | 1830 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1831 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1832 | if (ret < 0) |
1833 | goto err; | |
d83004aa | 1834 | |
f613e3e6 MD |
1835 | switch (cmd) { |
1836 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1837 | { | |
1838 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1839 | cmd, arg); | |
1840 | break; | |
1841 | } | |
8b97fd42 MD |
1842 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1843 | { | |
1844 | return put_u32(coherent, arg); | |
1845 | } | |
f613e3e6 MD |
1846 | default: |
1847 | break; | |
1848 | } | |
d83004aa JD |
1849 | err: |
1850 | return ret; | |
1851 | } | |
aeb9064d | 1852 | #endif |
d83004aa | 1853 | |
b3b8072b MD |
1854 | /* |
1855 | * This is not used by anonymous file descriptors. This code is left | |
1856 | * there if we ever want to implement an inode with open() operation. | |
1857 | */ | |
d83004aa JD |
1858 | static |
1859 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1860 | { | |
1861 | struct lttng_metadata_stream *stream = inode->i_private; | |
1862 | struct lib_ring_buffer *buf = stream->priv; | |
1863 | ||
1864 | file->private_data = buf; | |
b3b8072b MD |
1865 | /* |
1866 | * Since life-time of metadata cache differs from that of | |
1867 | * session, we need to keep our own reference on the transport. | |
1868 | */ | |
1869 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1870 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1871 | return -EBUSY; |
1872 | } | |
d83004aa JD |
1873 | return lib_ring_buffer_open(inode, file, buf); |
1874 | } | |
1875 | ||
1876 | static | |
1877 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1878 | { | |
1879 | struct lttng_metadata_stream *stream = file->private_data; | |
1880 | struct lib_ring_buffer *buf = stream->priv; | |
1881 | ||
92143b2c MD |
1882 | mutex_lock(&stream->metadata_cache->lock); |
1883 | list_del(&stream->list); | |
1884 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1885 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1886 | module_put(stream->transport->owner); |
92143b2c | 1887 | kfree(stream); |
d83004aa JD |
1888 | return lib_ring_buffer_release(inode, file, buf); |
1889 | } | |
1890 | ||
1891 | static | |
1892 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1893 | struct pipe_inode_info *pipe, size_t len, | |
1894 | unsigned int flags) | |
1895 | { | |
1896 | struct lttng_metadata_stream *stream = in->private_data; | |
1897 | struct lib_ring_buffer *buf = stream->priv; | |
1898 | ||
1899 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1900 | flags, buf); | |
1901 | } | |
1902 | ||
1903 | static | |
1904 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1905 | struct vm_area_struct *vma) | |
1906 | { | |
1907 | struct lttng_metadata_stream *stream = filp->private_data; | |
1908 | struct lib_ring_buffer *buf = stream->priv; | |
1909 | ||
1910 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1911 | } | |
1912 | ||
1913 | static | |
1914 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1915 | .owner = THIS_MODULE, | |
1916 | .open = lttng_metadata_ring_buffer_open, | |
1917 | .release = lttng_metadata_ring_buffer_release, | |
1918 | .poll = lttng_metadata_ring_buffer_poll, | |
1919 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1920 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1921 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1922 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1923 | #ifdef CONFIG_COMPAT | |
1924 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1925 | #endif | |
1926 | }; | |
1927 | ||
1928 | static | |
0c023c01 | 1929 | int lttng_abi_create_stream_fd(struct file *file, void *stream_priv, |
a3fcd499 | 1930 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1931 | { |
ad1c05e1 | 1932 | int stream_fd, ret; |
11b5a3c2 | 1933 | struct file *stream_file; |
ad1c05e1 | 1934 | |
4ac10b76 | 1935 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1936 | if (stream_fd < 0) { |
1937 | ret = stream_fd; | |
1938 | goto fd_error; | |
1939 | } | |
a3fcd499 | 1940 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1941 | if (IS_ERR(stream_file)) { |
1942 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1943 | goto file_error; |
1944 | } | |
409453cb MD |
1945 | /* |
1946 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1947 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1948 | * file descriptor, so we set FMODE_PREAD here. | |
1949 | */ | |
d7b6f197 | 1950 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1951 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1952 | /* |
1953 | * The stream holds a reference to the channel within the generic ring | |
1954 | * buffer library, so no need to hold a refcount on the channel and | |
1955 | * session files here. | |
1956 | */ | |
ad1c05e1 MD |
1957 | return stream_fd; |
1958 | ||
1959 | file_error: | |
1960 | put_unused_fd(stream_fd); | |
d83004aa JD |
1961 | fd_error: |
1962 | return ret; | |
1963 | } | |
1964 | ||
1965 | static | |
0c023c01 | 1966 | int lttng_abi_open_stream(struct file *file) |
d83004aa | 1967 | { |
0c023c01 | 1968 | struct lttng_channel *channel = file->private_data; |
d83004aa JD |
1969 | struct lib_ring_buffer *buf; |
1970 | int ret; | |
1971 | void *stream_priv; | |
1972 | ||
1973 | buf = channel->ops->buffer_read_open(channel->chan); | |
1974 | if (!buf) | |
1975 | return -ENOENT; | |
1976 | ||
1977 | stream_priv = buf; | |
0c023c01 | 1978 | ret = lttng_abi_create_stream_fd(file, stream_priv, |
a3fcd499 MD |
1979 | <tng_stream_ring_buffer_file_operations, |
1980 | "[lttng_stream]"); | |
d83004aa JD |
1981 | if (ret < 0) |
1982 | goto fd_error; | |
1983 | ||
1984 | return ret; | |
1985 | ||
1986 | fd_error: | |
1987 | channel->ops->buffer_read_close(buf); | |
1988 | return ret; | |
1989 | } | |
1990 | ||
1991 | static | |
0c023c01 | 1992 | int lttng_abi_open_metadata_stream(struct file *file) |
d83004aa | 1993 | { |
0c023c01 MD |
1994 | struct lttng_channel *channel = file->private_data; |
1995 | struct lttng_event_container *container = lttng_channel_get_event_container(channel); | |
1996 | struct lttng_session *session = container->session; | |
d83004aa JD |
1997 | struct lib_ring_buffer *buf; |
1998 | int ret; | |
1999 | struct lttng_metadata_stream *metadata_stream; | |
2000 | void *stream_priv; | |
2001 | ||
2002 | buf = channel->ops->buffer_read_open(channel->chan); | |
2003 | if (!buf) | |
2004 | return -ENOENT; | |
2005 | ||
2006 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
2007 | GFP_KERNEL); | |
b3b8072b MD |
2008 | if (!metadata_stream) { |
2009 | ret = -ENOMEM; | |
2010 | goto nomem; | |
2011 | } | |
d83004aa JD |
2012 | metadata_stream->metadata_cache = session->metadata_cache; |
2013 | init_waitqueue_head(&metadata_stream->read_wait); | |
2014 | metadata_stream->priv = buf; | |
2015 | stream_priv = metadata_stream; | |
b3b8072b | 2016 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
2017 | /* Initial state is an empty metadata, considered as incoherent. */ |
2018 | metadata_stream->coherent = false; | |
b3b8072b MD |
2019 | |
2020 | /* | |
2021 | * Since life-time of metadata cache differs from that of | |
2022 | * session, we need to keep our own reference on the transport. | |
2023 | */ | |
2024 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 2025 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
2026 | ret = -EINVAL; |
2027 | goto notransport; | |
2028 | } | |
2029 | ||
901aaa5f FD |
2030 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
2031 | ret = -EOVERFLOW; | |
9c1f4643 | 2032 | goto kref_error; |
901aaa5f FD |
2033 | } |
2034 | ||
0c023c01 | 2035 | ret = lttng_abi_create_stream_fd(file, stream_priv, |
a3fcd499 MD |
2036 | <tng_metadata_ring_buffer_file_operations, |
2037 | "[lttng_metadata_stream]"); | |
d83004aa JD |
2038 | if (ret < 0) |
2039 | goto fd_error; | |
2040 | ||
92143b2c | 2041 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
2042 | list_add(&metadata_stream->list, |
2043 | &session->metadata_cache->metadata_stream); | |
92143b2c | 2044 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
2045 | return ret; |
2046 | ||
ad1c05e1 | 2047 | fd_error: |
9c1f4643 MD |
2048 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
2049 | kref_error: | |
b3b8072b MD |
2050 | module_put(metadata_stream->transport->owner); |
2051 | notransport: | |
2052 | kfree(metadata_stream); | |
2053 | nomem: | |
11b5a3c2 | 2054 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
2055 | return ret; |
2056 | } | |
2057 | ||
21f58fb7 FD |
2058 | static |
2059 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
2060 | { | |
2061 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
2062 | struct channel *chan = event_notifier_group->chan; | |
2063 | struct lib_ring_buffer *buf; | |
2064 | int ret; | |
2065 | void *stream_priv; | |
2066 | ||
2067 | buf = event_notifier_group->ops->buffer_read_open(chan); | |
2068 | if (!buf) | |
2069 | return -ENOENT; | |
2070 | ||
2071 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
2072 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
2073 | ret = -EOVERFLOW; | |
2074 | goto refcount_error; | |
2075 | } | |
2076 | event_notifier_group->buf = buf; | |
2077 | stream_priv = event_notifier_group; | |
2078 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
2079 | <tng_event_notifier_group_notif_fops, | |
2080 | "[lttng_event_notifier_stream]"); | |
2081 | if (ret < 0) | |
2082 | goto fd_error; | |
2083 | ||
2084 | return ret; | |
2085 | ||
2086 | fd_error: | |
2087 | atomic_long_dec(¬if_file->f_count); | |
2088 | refcount_error: | |
2089 | event_notifier_group->ops->buffer_read_close(buf); | |
2090 | return ret; | |
2091 | } | |
2092 | ||
dffef45d FD |
2093 | static |
2094 | long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2095 | { | |
2b16f0c9 | 2096 | struct lttng_event_notifier *event_notifier; |
dffef45d FD |
2097 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
2098 | enum lttng_event_type *evtype = file->private_data; | |
2099 | ||
2100 | switch (cmd) { | |
2101 | case LTTNG_KERNEL_ENABLE: | |
2102 | switch (*evtype) { | |
2103 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
2104 | event_notifier = file->private_data; |
2105 | return lttng_event_notifier_enable(event_notifier); | |
dffef45d FD |
2106 | case LTTNG_TYPE_ENABLER: |
2107 | event_notifier_enabler = file->private_data; | |
2108 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
2109 | default: | |
2110 | WARN_ON_ONCE(1); | |
2111 | return -ENOSYS; | |
2112 | } | |
2113 | case LTTNG_KERNEL_DISABLE: | |
2114 | switch (*evtype) { | |
2115 | case LTTNG_TYPE_EVENT: | |
2b16f0c9 FD |
2116 | event_notifier = file->private_data; |
2117 | return lttng_event_notifier_disable(event_notifier); | |
dffef45d FD |
2118 | case LTTNG_TYPE_ENABLER: |
2119 | event_notifier_enabler = file->private_data; | |
2120 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
2121 | default: | |
2122 | WARN_ON_ONCE(1); | |
2123 | return -ENOSYS; | |
2124 | } | |
2125 | case LTTNG_KERNEL_FILTER: | |
2126 | switch (*evtype) { | |
2127 | case LTTNG_TYPE_EVENT: | |
2128 | return -EINVAL; | |
2129 | case LTTNG_TYPE_ENABLER: | |
2130 | event_notifier_enabler = file->private_data; | |
183e8b3a FD |
2131 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
2132 | event_notifier_enabler, | |
dffef45d FD |
2133 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2134 | default: | |
2135 | WARN_ON_ONCE(1); | |
2136 | return -ENOSYS; | |
2137 | } | |
99d223ad FD |
2138 | |
2139 | case LTTNG_KERNEL_CAPTURE: | |
2140 | switch (*evtype) { | |
2141 | case LTTNG_TYPE_EVENT: | |
2142 | return -EINVAL; | |
2143 | case LTTNG_TYPE_ENABLER: | |
2144 | event_notifier_enabler = file->private_data; | |
2145 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
2146 | event_notifier_enabler, | |
2147 | (struct lttng_kernel_capture_bytecode __user *) arg); | |
2148 | default: | |
2149 | WARN_ON_ONCE(1); | |
2150 | return -ENOSYS; | |
2151 | } | |
9de67196 FD |
2152 | case LTTNG_KERNEL_ADD_CALLSITE: |
2153 | switch (*evtype) { | |
2154 | case LTTNG_TYPE_EVENT: | |
2155 | event_notifier = file->private_data; | |
2156 | return lttng_event_notifier_add_callsite(event_notifier, | |
2157 | (struct lttng_kernel_event_callsite __user *) arg); | |
2158 | case LTTNG_TYPE_ENABLER: | |
2159 | return -EINVAL; | |
2160 | default: | |
2161 | WARN_ON_ONCE(1); | |
2162 | return -ENOSYS; | |
2163 | } | |
dffef45d FD |
2164 | default: |
2165 | return -ENOIOCTLCMD; | |
2166 | } | |
2167 | } | |
2168 | ||
2169 | static | |
2170 | int lttng_event_notifier_release(struct inode *inode, struct file *file) | |
2171 | { | |
2172 | struct lttng_event_notifier *event_notifier; | |
2173 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2174 | enum lttng_event_type *evtype = file->private_data; | |
2175 | ||
2176 | if (!evtype) | |
2177 | return 0; | |
2178 | ||
2179 | switch (*evtype) { | |
2180 | case LTTNG_TYPE_EVENT: | |
2181 | event_notifier = file->private_data; | |
2182 | if (event_notifier) | |
2183 | fput(event_notifier->group->file); | |
2184 | break; | |
2185 | case LTTNG_TYPE_ENABLER: | |
2186 | event_notifier_enabler = file->private_data; | |
2187 | if (event_notifier_enabler) | |
2188 | fput(event_notifier_enabler->group->file); | |
2189 | break; | |
2190 | default: | |
2191 | WARN_ON_ONCE(1); | |
2192 | break; | |
2193 | } | |
2194 | ||
2195 | return 0; | |
2196 | } | |
2197 | ||
2198 | static const struct file_operations lttng_event_notifier_fops = { | |
2199 | .owner = THIS_MODULE, | |
2200 | .release = lttng_event_notifier_release, | |
2201 | .unlocked_ioctl = lttng_event_notifier_ioctl, | |
2202 | #ifdef CONFIG_COMPAT | |
2203 | .compat_ioctl = lttng_event_notifier_ioctl, | |
2204 | #endif | |
2205 | }; | |
2206 | ||
2207 | static | |
2208 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
2209 | struct lttng_kernel_event_notifier *event_notifier_param) | |
2210 | { | |
2211 | struct lttng_event_notifier_group *event_notifier_group = | |
2212 | event_notifier_group_file->private_data; | |
2213 | int event_notifier_fd, ret; | |
2214 | struct file *event_notifier_file; | |
2215 | void *priv; | |
2216 | ||
2217 | switch (event_notifier_param->event.instrumentation) { | |
2218 | case LTTNG_KERNEL_TRACEPOINT: | |
9de67196 | 2219 | case LTTNG_KERNEL_UPROBE: |
b01155ba | 2220 | break; |
dffef45d | 2221 | case LTTNG_KERNEL_KPROBE: |
2b16f0c9 FD |
2222 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
2223 | break; | |
8a8ac9a8 FD |
2224 | case LTTNG_KERNEL_SYSCALL: |
2225 | break; | |
dffef45d | 2226 | case LTTNG_KERNEL_KRETPROBE: |
9de67196 | 2227 | /* Placing an event notifier on kretprobe is not supported. */ |
dffef45d FD |
2228 | case LTTNG_KERNEL_FUNCTION: |
2229 | case LTTNG_KERNEL_NOOP: | |
dffef45d FD |
2230 | default: |
2231 | ret = -EINVAL; | |
2232 | goto inval_instr; | |
2233 | } | |
2234 | ||
2235 | event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2236 | ||
2237 | event_notifier_fd = lttng_get_unused_fd(); | |
2238 | if (event_notifier_fd < 0) { | |
2239 | ret = event_notifier_fd; | |
2240 | goto fd_error; | |
2241 | } | |
2242 | ||
2243 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
2244 | <tng_event_notifier_fops, | |
2245 | NULL, O_RDWR); | |
2246 | if (IS_ERR(event_notifier_file)) { | |
2247 | ret = PTR_ERR(event_notifier_file); | |
2248 | goto file_error; | |
2249 | } | |
2250 | ||
2251 | /* The event notifier holds a reference on the event notifier group. */ | |
2252 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2253 | ret = -EOVERFLOW; | |
2254 | goto refcount_error; | |
2255 | } | |
2256 | ||
2257 | if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT | |
2258 | || event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) { | |
2259 | struct lttng_event_notifier_enabler *enabler; | |
2260 | ||
2261 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2262 | /* | |
2263 | * If the event name is a star globbing pattern, | |
2264 | * we create the special star globbing enabler. | |
2265 | */ | |
2266 | enabler = lttng_event_notifier_enabler_create( | |
2267 | event_notifier_group, | |
2268 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
2269 | event_notifier_param); | |
2270 | } else { | |
2271 | enabler = lttng_event_notifier_enabler_create( | |
2272 | event_notifier_group, | |
2273 | LTTNG_ENABLER_FORMAT_NAME, | |
2274 | event_notifier_param); | |
2275 | } | |
2276 | priv = enabler; | |
2277 | } else { | |
2278 | struct lttng_event_notifier *event_notifier; | |
2279 | ||
2280 | /* | |
2281 | * We tolerate no failure path after event notifier creation. | |
2282 | * It will stay invariant for the rest of the session. | |
2283 | */ | |
2284 | event_notifier = lttng_event_notifier_create(NULL, | |
99f52fcc FD |
2285 | event_notifier_param->event.token, |
2286 | event_notifier_param->error_counter_index, | |
2287 | event_notifier_group, | |
dffef45d FD |
2288 | event_notifier_param, NULL, |
2289 | event_notifier_param->event.instrumentation); | |
2290 | WARN_ON_ONCE(!event_notifier); | |
2291 | if (IS_ERR(event_notifier)) { | |
2292 | ret = PTR_ERR(event_notifier); | |
2293 | goto event_notifier_error; | |
2294 | } | |
2295 | priv = event_notifier; | |
2296 | } | |
2297 | event_notifier_file->private_data = priv; | |
2298 | fd_install(event_notifier_fd, event_notifier_file); | |
2299 | return event_notifier_fd; | |
2300 | ||
2301 | event_notifier_error: | |
2302 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2303 | refcount_error: | |
2304 | fput(event_notifier_file); | |
2305 | file_error: | |
2306 | put_unused_fd(event_notifier_fd); | |
2307 | fd_error: | |
2308 | inval_instr: | |
2309 | return ret; | |
2310 | } | |
2311 | ||
99f52fcc FD |
2312 | static |
2313 | long lttng_abi_event_notifier_group_create_error_counter( | |
2314 | struct file *event_notifier_group_file, | |
2315 | const struct lttng_kernel_counter_conf *error_counter_conf) | |
2316 | { | |
2317 | int counter_fd, ret; | |
2318 | char *counter_transport_name; | |
2319 | size_t counter_len; | |
0c023c01 MD |
2320 | struct lttng_counter *counter; |
2321 | struct lttng_event_container *container; | |
99f52fcc FD |
2322 | struct file *counter_file; |
2323 | struct lttng_event_notifier_group *event_notifier_group = | |
2324 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2325 | ||
2326 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) { | |
2327 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); | |
2328 | return -EINVAL; | |
2329 | } | |
2330 | ||
2331 | if (error_counter_conf->number_dimensions != 1) { | |
2332 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2333 | return -EINVAL; | |
2334 | } | |
2335 | ||
2336 | switch (error_counter_conf->bitness) { | |
2337 | case LTTNG_KERNEL_COUNTER_BITNESS_64: | |
2338 | counter_transport_name = "counter-per-cpu-64-modular"; | |
2339 | break; | |
2340 | case LTTNG_KERNEL_COUNTER_BITNESS_32: | |
2341 | counter_transport_name = "counter-per-cpu-32-modular"; | |
2342 | break; | |
2343 | default: | |
2344 | return -EINVAL; | |
2345 | } | |
2346 | ||
99f52fcc FD |
2347 | counter_fd = lttng_get_unused_fd(); |
2348 | if (counter_fd < 0) { | |
2349 | ret = counter_fd; | |
2350 | goto fd_error; | |
2351 | } | |
2352 | ||
2353 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2354 | <tng_counter_fops, | |
2355 | NULL, O_RDONLY); | |
2356 | if (IS_ERR(counter_file)) { | |
2357 | ret = PTR_ERR(counter_file); | |
2358 | goto file_error; | |
2359 | } | |
2360 | ||
2361 | counter_len = error_counter_conf->dimensions[0].size; | |
2362 | ||
2363 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2364 | ret = -EOVERFLOW; | |
2365 | goto refcount_error; | |
2366 | } | |
2367 | ||
0c023c01 MD |
2368 | ret = lttng_event_notifier_group_set_error_counter(event_notifier_group, |
2369 | counter_transport_name, counter_len); | |
2370 | if (ret) | |
99f52fcc | 2371 | goto counter_error; |
99f52fcc | 2372 | |
0c023c01 MD |
2373 | counter = event_notifier_group->error_counter; |
2374 | container = lttng_counter_get_event_container(counter); | |
2375 | container->file = counter_file; | |
99f52fcc FD |
2376 | counter->owner = event_notifier_group->file; |
2377 | counter_file->private_data = counter; | |
99f52fcc FD |
2378 | |
2379 | fd_install(counter_fd, counter_file); | |
99f52fcc FD |
2380 | |
2381 | return counter_fd; | |
2382 | ||
2383 | counter_error: | |
2384 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2385 | refcount_error: | |
2386 | fput(counter_file); | |
2387 | file_error: | |
2388 | put_unused_fd(counter_fd); | |
2389 | fd_error: | |
99f52fcc FD |
2390 | return ret; |
2391 | } | |
2392 | ||
750b05f2 FD |
2393 | static |
2394 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2395 | unsigned long arg) | |
2396 | { | |
2397 | switch (cmd) { | |
21f58fb7 FD |
2398 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
2399 | { | |
2400 | return lttng_abi_open_event_notifier_group_stream(file); | |
2401 | } | |
dffef45d FD |
2402 | case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE: |
2403 | { | |
2404 | struct lttng_kernel_event_notifier uevent_notifier_param; | |
2405 | ||
2406 | if (copy_from_user(&uevent_notifier_param, | |
2407 | (struct lttng_kernel_event_notifier __user *) arg, | |
2408 | sizeof(uevent_notifier_param))) | |
2409 | return -EFAULT; | |
2410 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2411 | } | |
99f52fcc FD |
2412 | case LTTNG_KERNEL_COUNTER: |
2413 | { | |
2414 | struct lttng_kernel_counter_conf uerror_counter_conf; | |
2415 | ||
2416 | if (copy_from_user(&uerror_counter_conf, | |
2417 | (struct lttng_kernel_counter_conf __user *) arg, | |
2418 | sizeof(uerror_counter_conf))) | |
2419 | return -EFAULT; | |
2420 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2421 | &uerror_counter_conf); | |
2422 | } | |
750b05f2 FD |
2423 | default: |
2424 | return -ENOIOCTLCMD; | |
2425 | } | |
2426 | return 0; | |
2427 | } | |
2428 | ||
2429 | static | |
2430 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2431 | { | |
2432 | struct lttng_event_notifier_group *event_notifier_group = | |
2433 | file->private_data; | |
2434 | ||
2435 | if (event_notifier_group) | |
2436 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2437 | return 0; | |
2438 | } | |
2439 | ||
2440 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2441 | .owner = THIS_MODULE, | |
2442 | .release = lttng_event_notifier_group_release, | |
2443 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2444 | #ifdef CONFIG_COMPAT | |
2445 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2446 | #endif | |
2447 | }; | |
2448 | ||
ad1c05e1 MD |
2449 | /** |
2450 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2451 | * | |
c0e31d2e | 2452 | * @file: the file |
ad1c05e1 MD |
2453 | * @cmd: the command |
2454 | * @arg: command arg | |
2455 | * | |
2456 | * This ioctl implements lttng commands: | |
38d024ae | 2457 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
2458 | * Returns an event stream file descriptor or failure. |
2459 | * (typically, one event stream records events from one CPU) | |
38d024ae | 2460 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 2461 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
2462 | * LTTNG_KERNEL_CONTEXT |
2463 | * Prepend a context field to each event in the channel | |
e64957da MD |
2464 | * LTTNG_KERNEL_ENABLE |
2465 | * Enable recording for events in this channel (weak enable) | |
2466 | * LTTNG_KERNEL_DISABLE | |
2467 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 2468 | * |
baf20995 MD |
2469 | * Channel and event file descriptors also hold a reference on the session. |
2470 | */ | |
ad1c05e1 | 2471 | static |
c0e31d2e | 2472 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2473 | { |
a90917c3 | 2474 | struct lttng_channel *channel = file->private_data; |
0c023c01 | 2475 | struct lttng_event_container *container = lttng_channel_get_event_container(channel); |
8070f5c0 | 2476 | |
baf20995 | 2477 | switch (cmd) { |
6dccd6c1 | 2478 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2479 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 2480 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
2481 | case LTTNG_KERNEL_OLD_EVENT: |
2482 | { | |
2483 | struct lttng_kernel_event *uevent_param; | |
2484 | struct lttng_kernel_old_event *old_uevent_param; | |
2485 | int ret; | |
2486 | ||
2487 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
2488 | GFP_KERNEL); | |
2489 | if (!uevent_param) { | |
2490 | ret = -ENOMEM; | |
2491 | goto old_event_end; | |
2492 | } | |
2493 | old_uevent_param = kmalloc( | |
2494 | sizeof(struct lttng_kernel_old_event), | |
2495 | GFP_KERNEL); | |
2496 | if (!old_uevent_param) { | |
2497 | ret = -ENOMEM; | |
2498 | goto old_event_error_free_param; | |
2499 | } | |
2500 | if (copy_from_user(old_uevent_param, | |
2501 | (struct lttng_kernel_old_event __user *) arg, | |
2502 | sizeof(struct lttng_kernel_old_event))) { | |
2503 | ret = -EFAULT; | |
2504 | goto old_event_error_free_old_param; | |
2505 | } | |
2506 | ||
2507 | memcpy(uevent_param->name, old_uevent_param->name, | |
2508 | sizeof(uevent_param->name)); | |
2509 | uevent_param->instrumentation = | |
2510 | old_uevent_param->instrumentation; | |
2511 | ||
2512 | switch (old_uevent_param->instrumentation) { | |
2513 | case LTTNG_KERNEL_KPROBE: | |
2514 | uevent_param->u.kprobe.addr = | |
2515 | old_uevent_param->u.kprobe.addr; | |
2516 | uevent_param->u.kprobe.offset = | |
2517 | old_uevent_param->u.kprobe.offset; | |
2518 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2519 | old_uevent_param->u.kprobe.symbol_name, | |
2520 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2521 | break; | |
2522 | case LTTNG_KERNEL_KRETPROBE: | |
2523 | uevent_param->u.kretprobe.addr = | |
2524 | old_uevent_param->u.kretprobe.addr; | |
2525 | uevent_param->u.kretprobe.offset = | |
2526 | old_uevent_param->u.kretprobe.offset; | |
2527 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2528 | old_uevent_param->u.kretprobe.symbol_name, | |
2529 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2530 | break; | |
2531 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
2532 | WARN_ON_ONCE(1); |
2533 | /* Not implemented. */ | |
6dccd6c1 JD |
2534 | break; |
2535 | default: | |
2536 | break; | |
2537 | } | |
0c023c01 | 2538 | ret = lttng_abi_create_event(file, container, uevent_param, NULL); |
6dccd6c1 JD |
2539 | |
2540 | old_event_error_free_old_param: | |
2541 | kfree(old_uevent_param); | |
2542 | old_event_error_free_param: | |
2543 | kfree(uevent_param); | |
2544 | old_event_end: | |
2545 | return ret; | |
2546 | } | |
38d024ae | 2547 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
2548 | { |
2549 | struct lttng_kernel_event uevent_param; | |
2550 | ||
2551 | if (copy_from_user(&uevent_param, | |
2552 | (struct lttng_kernel_event __user *) arg, | |
2553 | sizeof(uevent_param))) | |
2554 | return -EFAULT; | |
0c023c01 | 2555 | return lttng_abi_create_event(file, container, &uevent_param, NULL); |
6dccd6c1 JD |
2556 | } |
2557 | case LTTNG_KERNEL_OLD_CONTEXT: | |
2558 | { | |
2559 | struct lttng_kernel_context *ucontext_param; | |
2560 | struct lttng_kernel_old_context *old_ucontext_param; | |
2561 | int ret; | |
2562 | ||
2563 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
2564 | GFP_KERNEL); | |
2565 | if (!ucontext_param) { | |
2566 | ret = -ENOMEM; | |
2567 | goto old_ctx_end; | |
2568 | } | |
2569 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
2570 | GFP_KERNEL); | |
2571 | if (!old_ucontext_param) { | |
2572 | ret = -ENOMEM; | |
2573 | goto old_ctx_error_free_param; | |
2574 | } | |
2575 | ||
2576 | if (copy_from_user(old_ucontext_param, | |
2577 | (struct lttng_kernel_old_context __user *) arg, | |
2578 | sizeof(struct lttng_kernel_old_context))) { | |
2579 | ret = -EFAULT; | |
2580 | goto old_ctx_error_free_old_param; | |
2581 | } | |
2582 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2583 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2584 | sizeof(ucontext_param->padding)); | |
2585 | /* only type that uses the union */ | |
2586 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
2587 | ucontext_param->u.perf_counter.type = | |
2588 | old_ucontext_param->u.perf_counter.type; | |
2589 | ucontext_param->u.perf_counter.config = | |
2590 | old_ucontext_param->u.perf_counter.config; | |
2591 | memcpy(ucontext_param->u.perf_counter.name, | |
2592 | old_ucontext_param->u.perf_counter.name, | |
2593 | sizeof(ucontext_param->u.perf_counter.name)); | |
2594 | } | |
2595 | ||
2596 | ret = lttng_abi_add_context(file, | |
2597 | ucontext_param, | |
0c023c01 | 2598 | &channel->ctx, container->session); |
6dccd6c1 JD |
2599 | |
2600 | old_ctx_error_free_old_param: | |
2601 | kfree(old_ucontext_param); | |
2602 | old_ctx_error_free_param: | |
2603 | kfree(ucontext_param); | |
2604 | old_ctx_end: | |
2605 | return ret; | |
2606 | } | |
8070f5c0 | 2607 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
2608 | { |
2609 | struct lttng_kernel_context ucontext_param; | |
2610 | ||
2611 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 2612 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
2613 | sizeof(ucontext_param))) |
2614 | return -EFAULT; | |
2615 | return lttng_abi_add_context(file, | |
2616 | &ucontext_param, | |
0c023c01 | 2617 | &channel->ctx, container->session); |
6dccd6c1 JD |
2618 | } |
2619 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2620 | case LTTNG_KERNEL_ENABLE: |
0c023c01 | 2621 | return lttng_event_container_enable(container); |
6dccd6c1 | 2622 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2623 | case LTTNG_KERNEL_DISABLE: |
0c023c01 | 2624 | return lttng_event_container_disable(container); |
12e579db | 2625 | case LTTNG_KERNEL_SYSCALL_MASK: |
0c023c01 | 2626 | return lttng_event_container_syscall_mask(container, |
12e579db | 2627 | (struct lttng_kernel_syscall_mask __user *) arg); |
baf20995 MD |
2628 | default: |
2629 | return -ENOIOCTLCMD; | |
2630 | } | |
2631 | } | |
2632 | ||
5dbbdb43 MD |
2633 | /** |
2634 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2635 | * | |
2636 | * @file: the file | |
2637 | * @cmd: the command | |
2638 | * @arg: command arg | |
2639 | * | |
2640 | * This ioctl implements lttng commands: | |
38d024ae | 2641 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
2642 | * Returns an event stream file descriptor or failure. |
2643 | * | |
2644 | * Channel and event file descriptors also hold a reference on the session. | |
2645 | */ | |
2646 | static | |
2647 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2648 | { | |
2649 | switch (cmd) { | |
6dccd6c1 | 2650 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2651 | case LTTNG_KERNEL_STREAM: |
d83004aa | 2652 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2653 | default: |
2654 | return -ENOIOCTLCMD; | |
2655 | } | |
2656 | } | |
2657 | ||
653fe716 MD |
2658 | /** |
2659 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2660 | * | |
c0e31d2e | 2661 | * @file: the file |
653fe716 MD |
2662 | * @wait: poll table |
2663 | */ | |
c0e31d2e | 2664 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2665 | { |
a90917c3 | 2666 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2667 | unsigned int mask = 0; |
2668 | ||
c0e31d2e | 2669 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2670 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2671 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2672 | wait); | |
653fe716 | 2673 | |
254ec7bc MD |
2674 | if (channel->ops->is_disabled(channel->chan)) |
2675 | return POLLERR; | |
24cedcfe | 2676 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2677 | return POLLHUP; |
f71ecafa | 2678 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2679 | return POLLIN | POLLRDNORM; |
f71ecafa | 2680 | return 0; |
653fe716 MD |
2681 | } |
2682 | return mask; | |
2683 | ||
2684 | } | |
2685 | ||
0a84a57f MD |
2686 | static |
2687 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2688 | { | |
0c023c01 MD |
2689 | struct lttng_channel *chan = file->private_data; |
2690 | ||
2691 | if (chan) { | |
2692 | struct lttng_event_container *container = lttng_channel_get_event_container(chan); | |
c269fff4 | 2693 | |
0c023c01 MD |
2694 | fput(container->session->file); |
2695 | } | |
0a84a57f MD |
2696 | return 0; |
2697 | } | |
2698 | ||
d83004aa JD |
2699 | static |
2700 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2701 | { | |
0c023c01 MD |
2702 | struct lttng_channel *chan = file->private_data; |
2703 | ||
2704 | if (chan) { | |
2705 | struct lttng_event_container *container = lttng_channel_get_event_container(chan); | |
d83004aa | 2706 | |
0c023c01 MD |
2707 | fput(container->session->file); |
2708 | lttng_metadata_channel_destroy(chan); | |
d83004aa JD |
2709 | } |
2710 | ||
2711 | return 0; | |
2712 | } | |
2713 | ||
ad1c05e1 | 2714 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2715 | .owner = THIS_MODULE, |
03037b98 | 2716 | .release = lttng_channel_release, |
653fe716 | 2717 | .poll = lttng_channel_poll, |
ad1c05e1 | 2718 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2719 | #ifdef CONFIG_COMPAT |
03037b98 | 2720 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2721 | #endif |
11b5a3c2 | 2722 | }; |
baf20995 | 2723 | |
5dbbdb43 | 2724 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2725 | .owner = THIS_MODULE, |
d83004aa | 2726 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2727 | .unlocked_ioctl = lttng_metadata_ioctl, |
2728 | #ifdef CONFIG_COMPAT | |
2729 | .compat_ioctl = lttng_metadata_ioctl, | |
2730 | #endif | |
2731 | }; | |
2732 | ||
8070f5c0 MD |
2733 | /** |
2734 | * lttng_event_ioctl - lttng syscall through ioctl | |
2735 | * | |
2736 | * @file: the file | |
2737 | * @cmd: the command | |
2738 | * @arg: command arg | |
2739 | * | |
2740 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
2741 | * LTTNG_KERNEL_CONTEXT |
2742 | * Prepend a context field to each record of this event | |
e64957da MD |
2743 | * LTTNG_KERNEL_ENABLE |
2744 | * Enable recording for this event (weak enable) | |
2745 | * LTTNG_KERNEL_DISABLE | |
2746 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
2747 | */ |
2748 | static | |
2749 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2750 | { | |
3c997079 | 2751 | struct lttng_event *event; |
b2bc0bc8 | 2752 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2753 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
2754 | |
2755 | switch (cmd) { | |
6dccd6c1 JD |
2756 | case LTTNG_KERNEL_OLD_CONTEXT: |
2757 | { | |
3c997079 MD |
2758 | /* Not implemented */ |
2759 | return -ENOSYS; | |
6dccd6c1 | 2760 | } |
8070f5c0 | 2761 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 2762 | { |
3c997079 MD |
2763 | /* Not implemented */ |
2764 | return -ENOSYS; | |
6dccd6c1 JD |
2765 | } |
2766 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2767 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
2768 | switch (*evtype) { |
2769 | case LTTNG_TYPE_EVENT: | |
2770 | event = file->private_data; | |
2771 | return lttng_event_enable(event); | |
2772 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2773 | event_enabler = file->private_data; |
2774 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
2775 | default: |
2776 | WARN_ON_ONCE(1); | |
2777 | return -ENOSYS; | |
2778 | } | |
6dccd6c1 | 2779 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2780 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
2781 | switch (*evtype) { |
2782 | case LTTNG_TYPE_EVENT: | |
2783 | event = file->private_data; | |
2784 | return lttng_event_disable(event); | |
2785 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2786 | event_enabler = file->private_data; |
2787 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
2788 | default: |
2789 | WARN_ON_ONCE(1); | |
2790 | return -ENOSYS; | |
2791 | } | |
07dfc1d0 MD |
2792 | case LTTNG_KERNEL_FILTER: |
2793 | switch (*evtype) { | |
2794 | case LTTNG_TYPE_EVENT: | |
2795 | return -EINVAL; | |
2796 | case LTTNG_TYPE_ENABLER: | |
2797 | { | |
b2bc0bc8 | 2798 | event_enabler = file->private_data; |
183e8b3a FD |
2799 | return lttng_event_enabler_attach_filter_bytecode( |
2800 | event_enabler, | |
07dfc1d0 MD |
2801 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2802 | } | |
0586316f MD |
2803 | default: |
2804 | WARN_ON_ONCE(1); | |
2805 | return -ENOSYS; | |
07dfc1d0 | 2806 | } |
3aed4dca FD |
2807 | case LTTNG_KERNEL_ADD_CALLSITE: |
2808 | switch (*evtype) { | |
2809 | case LTTNG_TYPE_EVENT: | |
2810 | event = file->private_data; | |
2811 | return lttng_event_add_callsite(event, | |
2812 | (struct lttng_kernel_event_callsite __user *) arg); | |
2813 | case LTTNG_TYPE_ENABLER: | |
2814 | return -EINVAL; | |
64c147c0 MD |
2815 | default: |
2816 | WARN_ON_ONCE(1); | |
2817 | return -ENOSYS; | |
3aed4dca | 2818 | } |
8070f5c0 MD |
2819 | default: |
2820 | return -ENOIOCTLCMD; | |
2821 | } | |
2822 | } | |
2823 | ||
0a84a57f MD |
2824 | static |
2825 | int lttng_event_release(struct inode *inode, struct file *file) | |
2826 | { | |
3c997079 | 2827 | struct lttng_event *event; |
b2bc0bc8 | 2828 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2829 | enum lttng_event_type *evtype = file->private_data; |
2830 | ||
2831 | if (!evtype) | |
2832 | return 0; | |
2833 | ||
2834 | switch (*evtype) { | |
2835 | case LTTNG_TYPE_EVENT: | |
2836 | event = file->private_data; | |
2837 | if (event) | |
0c023c01 | 2838 | fput(event->container->file); |
3c997079 MD |
2839 | break; |
2840 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
2841 | event_enabler = file->private_data; |
2842 | if (event_enabler) | |
0c023c01 | 2843 | fput(event_enabler->container->file); |
3c997079 MD |
2844 | break; |
2845 | default: | |
2846 | WARN_ON_ONCE(1); | |
2847 | break; | |
2848 | } | |
c269fff4 | 2849 | |
0a84a57f MD |
2850 | return 0; |
2851 | } | |
2852 | ||
3b923e5b | 2853 | /* TODO: filter control ioctl */ |
0a84a57f | 2854 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 2855 | .owner = THIS_MODULE, |
0a84a57f | 2856 | .release = lttng_event_release, |
8070f5c0 MD |
2857 | .unlocked_ioctl = lttng_event_ioctl, |
2858 | #ifdef CONFIG_COMPAT | |
2859 | .compat_ioctl = lttng_event_ioctl, | |
2860 | #endif | |
11b5a3c2 | 2861 | }; |
0a84a57f | 2862 | |
3b731ab1 JD |
2863 | static int put_u64(uint64_t val, unsigned long arg) |
2864 | { | |
2865 | return put_user(val, (uint64_t __user *) arg); | |
2866 | } | |
2867 | ||
8b97fd42 MD |
2868 | static int put_u32(uint32_t val, unsigned long arg) |
2869 | { | |
2870 | return put_user(val, (uint32_t __user *) arg); | |
2871 | } | |
2872 | ||
ed8d02d6 JD |
2873 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2874 | unsigned int cmd, unsigned long arg) | |
2875 | { | |
3b731ab1 JD |
2876 | struct lib_ring_buffer *buf = filp->private_data; |
2877 | struct channel *chan = buf->backend.chan; | |
2878 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2879 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2880 | int ret; |
2881 | ||
2882 | if (atomic_read(&chan->record_disabled)) | |
2883 | return -EIO; | |
2884 | ||
ed8d02d6 | 2885 | switch (cmd) { |
3b731ab1 JD |
2886 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
2887 | { | |
2888 | uint64_t ts; | |
2889 | ||
dd5a0db3 | 2890 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2891 | if (ret < 0) |
2892 | goto error; | |
2893 | return put_u64(ts, arg); | |
2894 | } | |
2895 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
2896 | { | |
2897 | uint64_t ts; | |
2898 | ||
dd5a0db3 | 2899 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2900 | if (ret < 0) |
2901 | goto error; | |
2902 | return put_u64(ts, arg); | |
2903 | } | |
2904 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
2905 | { | |
2906 | uint64_t ed; | |
2907 | ||
dd5a0db3 | 2908 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2909 | if (ret < 0) |
2910 | goto error; | |
2911 | return put_u64(ed, arg); | |
2912 | } | |
2913 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
2914 | { | |
2915 | uint64_t cs; | |
2916 | ||
dd5a0db3 | 2917 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2918 | if (ret < 0) |
2919 | goto error; | |
2920 | return put_u64(cs, arg); | |
2921 | } | |
2922 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
2923 | { | |
2924 | uint64_t ps; | |
2925 | ||
dd5a0db3 | 2926 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2927 | if (ret < 0) |
2928 | goto error; | |
2929 | return put_u64(ps, arg); | |
2930 | } | |
2931 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
2932 | { | |
2933 | uint64_t si; | |
2934 | ||
dd5a0db3 | 2935 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2936 | if (ret < 0) |
2937 | goto error; | |
2938 | return put_u64(si, arg); | |
2939 | } | |
2348ca17 JD |
2940 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2941 | { | |
2942 | uint64_t ts; | |
2943 | ||
dd5a0db3 | 2944 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2945 | if (ret < 0) |
2946 | goto error; | |
2947 | return put_u64(ts, arg); | |
2948 | } | |
5b3cf4f9 JD |
2949 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
2950 | { | |
2951 | uint64_t seq; | |
2952 | ||
2953 | ret = ops->sequence_number(config, buf, &seq); | |
2954 | if (ret < 0) | |
2955 | goto error; | |
2956 | return put_u64(seq, arg); | |
2957 | } | |
5594698f JD |
2958 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
2959 | { | |
2960 | uint64_t id; | |
2961 | ||
2962 | ret = ops->instance_id(config, buf, &id); | |
2963 | if (ret < 0) | |
2964 | goto error; | |
2965 | return put_u64(id, arg); | |
2966 | } | |
3b731ab1 JD |
2967 | default: |
2968 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2969 | cmd, arg); | |
ed8d02d6 | 2970 | } |
3b731ab1 JD |
2971 | |
2972 | error: | |
2973 | return -ENOSYS; | |
ed8d02d6 JD |
2974 | } |
2975 | ||
2976 | #ifdef CONFIG_COMPAT | |
2977 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2978 | unsigned int cmd, unsigned long arg) | |
2979 | { | |
3b731ab1 JD |
2980 | struct lib_ring_buffer *buf = filp->private_data; |
2981 | struct channel *chan = buf->backend.chan; | |
2982 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2983 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2984 | int ret; |
2985 | ||
2986 | if (atomic_read(&chan->record_disabled)) | |
2987 | return -EIO; | |
2988 | ||
ed8d02d6 | 2989 | switch (cmd) { |
3b731ab1 JD |
2990 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2991 | { | |
2992 | uint64_t ts; | |
2993 | ||
dd5a0db3 | 2994 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2995 | if (ret < 0) |
2996 | goto error; | |
2997 | return put_u64(ts, arg); | |
2998 | } | |
2999 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
3000 | { | |
3001 | uint64_t ts; | |
3002 | ||
dd5a0db3 | 3003 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
3004 | if (ret < 0) |
3005 | goto error; | |
3006 | return put_u64(ts, arg); | |
3007 | } | |
3008 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
3009 | { | |
3010 | uint64_t ed; | |
3011 | ||
dd5a0db3 | 3012 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
3013 | if (ret < 0) |
3014 | goto error; | |
3015 | return put_u64(ed, arg); | |
ed8d02d6 | 3016 | } |
3b731ab1 JD |
3017 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
3018 | { | |
3019 | uint64_t cs; | |
3020 | ||
dd5a0db3 | 3021 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
3022 | if (ret < 0) |
3023 | goto error; | |
3024 | return put_u64(cs, arg); | |
3025 | } | |
3026 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
3027 | { | |
3028 | uint64_t ps; | |
3029 | ||
dd5a0db3 | 3030 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
3031 | if (ret < 0) |
3032 | goto error; | |
3033 | return put_u64(ps, arg); | |
3034 | } | |
3035 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
3036 | { | |
3037 | uint64_t si; | |
3038 | ||
dd5a0db3 | 3039 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
3040 | if (ret < 0) |
3041 | goto error; | |
3042 | return put_u64(si, arg); | |
3043 | } | |
2348ca17 JD |
3044 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
3045 | { | |
3046 | uint64_t ts; | |
3047 | ||
dd5a0db3 | 3048 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
3049 | if (ret < 0) |
3050 | goto error; | |
3051 | return put_u64(ts, arg); | |
3052 | } | |
5b3cf4f9 JD |
3053 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
3054 | { | |
3055 | uint64_t seq; | |
3056 | ||
3057 | ret = ops->sequence_number(config, buf, &seq); | |
3058 | if (ret < 0) | |
3059 | goto error; | |
3060 | return put_u64(seq, arg); | |
3061 | } | |
5594698f JD |
3062 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
3063 | { | |
3064 | uint64_t id; | |
3065 | ||
3066 | ret = ops->instance_id(config, buf, &id); | |
3067 | if (ret < 0) | |
3068 | goto error; | |
3069 | return put_u64(id, arg); | |
3070 | } | |
3b731ab1 JD |
3071 | default: |
3072 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
3073 | cmd, arg); | |
3074 | } | |
3075 | ||
3076 | error: | |
3077 | return -ENOSYS; | |
ed8d02d6 JD |
3078 | } |
3079 | #endif /* CONFIG_COMPAT */ | |
3080 | ||
3081 | static void lttng_stream_override_ring_buffer_fops(void) | |
3082 | { | |
3083 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
3084 | lttng_stream_ring_buffer_file_operations.open = | |
3085 | lib_ring_buffer_file_operations.open; | |
3086 | lttng_stream_ring_buffer_file_operations.release = | |
3087 | lib_ring_buffer_file_operations.release; | |
3088 | lttng_stream_ring_buffer_file_operations.poll = | |
3089 | lib_ring_buffer_file_operations.poll; | |
3090 | lttng_stream_ring_buffer_file_operations.splice_read = | |
3091 | lib_ring_buffer_file_operations.splice_read; | |
3092 | lttng_stream_ring_buffer_file_operations.mmap = | |
3093 | lib_ring_buffer_file_operations.mmap; | |
3094 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
3095 | lttng_stream_ring_buffer_ioctl; | |
3096 | lttng_stream_ring_buffer_file_operations.llseek = | |
3097 | lib_ring_buffer_file_operations.llseek; | |
3098 | #ifdef CONFIG_COMPAT | |
3099 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
3100 | lttng_stream_ring_buffer_compat_ioctl; | |
3101 | #endif | |
3102 | } | |
3103 | ||
80996790 | 3104 | int __init lttng_abi_init(void) |
baf20995 MD |
3105 | { |
3106 | int ret = 0; | |
3107 | ||
263b6c88 | 3108 | wrapper_vmalloc_sync_mappings(); |
2754583e | 3109 | lttng_clock_ref(); |
f771eda6 JD |
3110 | |
3111 | ret = lttng_tp_mempool_init(); | |
3112 | if (ret) { | |
3113 | goto error; | |
3114 | } | |
3115 | ||
d29348f7 | 3116 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 3117 | <tng_proc_ops, NULL); |
2470a237 | 3118 | |
255e52a4 | 3119 | if (!lttng_proc_dentry) { |
5a15f70c | 3120 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
3121 | ret = -ENOMEM; |
3122 | goto error; | |
3123 | } | |
ed8d02d6 | 3124 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 3125 | return 0; |
ed8d02d6 | 3126 | |
baf20995 | 3127 | error: |
f771eda6 | 3128 | lttng_tp_mempool_destroy(); |
2754583e | 3129 | lttng_clock_unref(); |
baf20995 MD |
3130 | return ret; |
3131 | } | |
3132 | ||
e6e65fcd MD |
3133 | /* No __exit annotation because used by init error path too. */ |
3134 | void lttng_abi_exit(void) | |
baf20995 | 3135 | { |
f771eda6 | 3136 | lttng_tp_mempool_destroy(); |
2754583e | 3137 | lttng_clock_unref(); |
e6a17f26 MD |
3138 | if (lttng_proc_dentry) |
3139 | remove_proc_entry("lttng", NULL); | |
baf20995 | 3140 | } |