Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
e8951e63 | 3 | * lttng-abi.c |
baf20995 | 4 | * |
e8951e63 | 5 | * LTTng ABI |
baf20995 | 6 | * |
886d51a3 MD |
7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8 | * | |
baf20995 MD |
9 | * Mimic system calls for: |
10 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
11 | * - channel creation, returns a file descriptor or failure. |
12 | * - Operates on a session file descriptor | |
13 | * - Takes all channel options as parameters. | |
14 | * - stream get, returns a file descriptor or failure. | |
15 | * - Operates on a channel file descriptor. | |
16 | * - stream notifier get, returns a file descriptor or failure. | |
17 | * - Operates on a channel file descriptor. | |
18 | * - event creation, returns a file descriptor or failure. | |
19 | * - Operates on a channel file descriptor | |
20 | * - Takes an event name as parameter | |
21 | * - Takes an instrumentation source as parameter | |
22 | * - e.g. tracepoints, dynamic_probes... | |
23 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
24 | */ |
25 | ||
11b5a3c2 | 26 | #include <linux/module.h> |
e6a17f26 | 27 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/slab.h> | |
abc0446a | 32 | #include <linux/err.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
24591303 MD |
34 | #include <ringbuffer/vfs.h> |
35 | #include <ringbuffer/backend.h> | |
36 | #include <ringbuffer/frontend.h> | |
241ae9a8 MD |
37 | #include <wrapper/poll.h> |
38 | #include <wrapper/file.h> | |
39 | #include <wrapper/kref.h> | |
6657edec | 40 | #include <wrapper/barrier.h> |
2df37e95 MD |
41 | #include <lttng/string-utils.h> |
42 | #include <lttng/abi.h> | |
43 | #include <lttng/abi-old.h> | |
44 | #include <lttng/events.h> | |
92bc1e23 | 45 | #include <lttng/events-internal.h> |
2df37e95 MD |
46 | #include <lttng/tracer.h> |
47 | #include <lttng/tp-mempool.h> | |
24591303 | 48 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 49 | #include <ringbuffer/iterator.h> |
baf20995 MD |
50 | |
51 | /* | |
52 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 53 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
54 | */ |
55 | ||
e6a17f26 | 56 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 | 57 | |
5f4c791e | 58 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
59 | static const struct proc_ops lttng_proc_ops; |
60 | #else | |
61 | static const struct file_operations lttng_proc_ops; | |
62 | #endif | |
63 | ||
ad1c05e1 | 64 | static const struct file_operations lttng_session_fops; |
750b05f2 | 65 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 66 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 67 | static const struct file_operations lttng_metadata_fops; |
ef784b4d MD |
68 | static const struct file_operations lttng_event_recorder_event_fops; |
69 | static const struct file_operations lttng_event_recorder_enabler_fops; | |
ed8d02d6 | 70 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 71 | |
9616f0bf | 72 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 73 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 74 | |
99f52fcc FD |
75 | static int validate_zeroed_padding(char *p, size_t len) |
76 | { | |
77 | size_t i; | |
78 | ||
79 | for (i = 0; i < len; i++) { | |
80 | if (p[i]) | |
81 | return -1; | |
82 | } | |
83 | return 0; | |
84 | } | |
85 | ||
a33c9927 MD |
86 | /* |
87 | * Teardown management: opened file descriptors keep a refcount on the module, | |
88 | * so it can only exit when all file descriptors are closed. | |
89 | */ | |
90 | ||
ad1c05e1 | 91 | static |
baf20995 MD |
92 | int lttng_abi_create_session(void) |
93 | { | |
a90917c3 | 94 | struct lttng_session *session; |
c0e31d2e | 95 | struct file *session_file; |
11b5a3c2 | 96 | int session_fd, ret; |
baf20995 | 97 | |
a90917c3 | 98 | session = lttng_session_create(); |
baf20995 MD |
99 | if (!session) |
100 | return -ENOMEM; | |
4ac10b76 | 101 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
102 | if (session_fd < 0) { |
103 | ret = session_fd; | |
104 | goto fd_error; | |
105 | } | |
c0e31d2e | 106 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 107 | <tng_session_fops, |
baf20995 | 108 | session, O_RDWR); |
c0e31d2e MD |
109 | if (IS_ERR(session_file)) { |
110 | ret = PTR_ERR(session_file); | |
baf20995 MD |
111 | goto file_error; |
112 | } | |
c0e31d2e MD |
113 | session->file = session_file; |
114 | fd_install(session_fd, session_file); | |
baf20995 MD |
115 | return session_fd; |
116 | ||
117 | file_error: | |
118 | put_unused_fd(session_fd); | |
119 | fd_error: | |
a90917c3 | 120 | lttng_session_destroy(session); |
baf20995 MD |
121 | return ret; |
122 | } | |
123 | ||
21f58fb7 FD |
124 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
125 | { | |
126 | struct lttng_event_notifier_group *event_notifier_group = | |
127 | container_of(entry, struct lttng_event_notifier_group, | |
128 | wakeup_pending); | |
129 | wake_up_interruptible(&event_notifier_group->read_wait); | |
130 | } | |
131 | ||
750b05f2 FD |
132 | static |
133 | int lttng_abi_create_event_notifier_group(void) | |
134 | { | |
135 | struct lttng_event_notifier_group *event_notifier_group; | |
136 | struct file *event_notifier_group_file; | |
137 | int event_notifier_group_fd, ret; | |
138 | ||
139 | event_notifier_group = lttng_event_notifier_group_create(); | |
140 | if (!event_notifier_group) | |
141 | return -ENOMEM; | |
142 | ||
143 | event_notifier_group_fd = lttng_get_unused_fd(); | |
144 | if (event_notifier_group_fd < 0) { | |
145 | ret = event_notifier_group_fd; | |
146 | goto fd_error; | |
147 | } | |
148 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
149 | <tng_event_notifier_group_fops, | |
150 | event_notifier_group, O_RDWR); | |
151 | if (IS_ERR(event_notifier_group_file)) { | |
152 | ret = PTR_ERR(event_notifier_group_file); | |
153 | goto file_error; | |
154 | } | |
155 | ||
156 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
157 | init_waitqueue_head(&event_notifier_group->read_wait); |
158 | init_irq_work(&event_notifier_group->wakeup_pending, | |
159 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
160 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
161 | return event_notifier_group_fd; | |
162 | ||
163 | file_error: | |
164 | put_unused_fd(event_notifier_group_fd); | |
165 | fd_error: | |
166 | lttng_event_notifier_group_destroy(event_notifier_group); | |
167 | return ret; | |
168 | } | |
169 | ||
271b6681 MD |
170 | static |
171 | int lttng_abi_tracepoint_list(void) | |
172 | { | |
173 | struct file *tracepoint_list_file; | |
174 | int file_fd, ret; | |
175 | ||
4ac10b76 | 176 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
177 | if (file_fd < 0) { |
178 | ret = file_fd; | |
179 | goto fd_error; | |
180 | } | |
30f18bf0 | 181 | |
8ee099b6 | 182 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
183 | <tng_tracepoint_list_fops, |
184 | NULL, O_RDWR); | |
185 | if (IS_ERR(tracepoint_list_file)) { | |
186 | ret = PTR_ERR(tracepoint_list_file); | |
187 | goto file_error; | |
188 | } | |
30f18bf0 MD |
189 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
190 | if (ret < 0) | |
191 | goto open_error; | |
271b6681 MD |
192 | fd_install(file_fd, tracepoint_list_file); |
193 | return file_fd; | |
194 | ||
30f18bf0 MD |
195 | open_error: |
196 | fput(tracepoint_list_file); | |
271b6681 MD |
197 | file_error: |
198 | put_unused_fd(file_fd); | |
199 | fd_error: | |
200 | return ret; | |
201 | } | |
202 | ||
f127e61e MD |
203 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
204 | static inline | |
205 | int lttng_abi_syscall_list(void) | |
206 | { | |
207 | return -ENOSYS; | |
208 | } | |
209 | #else | |
210 | static | |
211 | int lttng_abi_syscall_list(void) | |
212 | { | |
213 | struct file *syscall_list_file; | |
214 | int file_fd, ret; | |
215 | ||
216 | file_fd = lttng_get_unused_fd(); | |
217 | if (file_fd < 0) { | |
218 | ret = file_fd; | |
219 | goto fd_error; | |
220 | } | |
221 | ||
222 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
223 | <tng_syscall_list_fops, | |
224 | NULL, O_RDWR); | |
225 | if (IS_ERR(syscall_list_file)) { | |
226 | ret = PTR_ERR(syscall_list_file); | |
227 | goto file_error; | |
228 | } | |
229 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
230 | if (ret < 0) | |
231 | goto open_error; | |
232 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
233 | return file_fd; |
234 | ||
235 | open_error: | |
236 | fput(syscall_list_file); | |
237 | file_error: | |
238 | put_unused_fd(file_fd); | |
239 | fd_error: | |
240 | return ret; | |
241 | } | |
242 | #endif | |
243 | ||
80c16bcf | 244 | static |
606828e4 | 245 | void lttng_abi_tracer_version(struct lttng_kernel_abi_tracer_version *v) |
80c16bcf | 246 | { |
6dccd6c1 JD |
247 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
248 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
249 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
250 | } |
251 | ||
42cabb80 | 252 | static |
606828e4 | 253 | void lttng_abi_tracer_abi_version(struct lttng_kernel_abi_tracer_abi_version *v) |
42cabb80 | 254 | { |
606828e4 MD |
255 | v->major = LTTNG_KERNEL_ABI_MAJOR_VERSION; |
256 | v->minor = LTTNG_KERNEL_ABI_MINOR_VERSION; | |
42cabb80 MD |
257 | } |
258 | ||
8070f5c0 MD |
259 | static |
260 | long lttng_abi_add_context(struct file *file, | |
606828e4 | 261 | struct lttng_kernel_abi_context *context_param, |
437d5aa5 | 262 | struct lttng_kernel_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 263 | { |
8070f5c0 MD |
264 | |
265 | if (session->been_active) | |
266 | return -EPERM; | |
267 | ||
6dccd6c1 | 268 | switch (context_param->ctx) { |
606828e4 | 269 | case LTTNG_KERNEL_ABI_CONTEXT_PID: |
8070f5c0 | 270 | return lttng_add_pid_to_ctx(ctx); |
606828e4 | 271 | case LTTNG_KERNEL_ABI_CONTEXT_PRIO: |
a8ad3613 | 272 | return lttng_add_prio_to_ctx(ctx); |
606828e4 | 273 | case LTTNG_KERNEL_ABI_CONTEXT_NICE: |
53f1f0ca | 274 | return lttng_add_nice_to_ctx(ctx); |
606828e4 | 275 | case LTTNG_KERNEL_ABI_CONTEXT_VPID: |
b64bc438 | 276 | return lttng_add_vpid_to_ctx(ctx); |
606828e4 | 277 | case LTTNG_KERNEL_ABI_CONTEXT_TID: |
b64bc438 | 278 | return lttng_add_tid_to_ctx(ctx); |
606828e4 | 279 | case LTTNG_KERNEL_ABI_CONTEXT_VTID: |
b64bc438 | 280 | return lttng_add_vtid_to_ctx(ctx); |
606828e4 | 281 | case LTTNG_KERNEL_ABI_CONTEXT_PPID: |
b64bc438 | 282 | return lttng_add_ppid_to_ctx(ctx); |
606828e4 | 283 | case LTTNG_KERNEL_ABI_CONTEXT_VPPID: |
b64bc438 | 284 | return lttng_add_vppid_to_ctx(ctx); |
606828e4 MD |
285 | case LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER: |
286 | context_param->u.perf_counter.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
6dccd6c1 JD |
287 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, |
288 | context_param->u.perf_counter.config, | |
289 | context_param->u.perf_counter.name, | |
c24a0d71 | 290 | ctx); |
606828e4 | 291 | case LTTNG_KERNEL_ABI_CONTEXT_PROCNAME: |
a2563e83 | 292 | return lttng_add_procname_to_ctx(ctx); |
606828e4 | 293 | case LTTNG_KERNEL_ABI_CONTEXT_HOSTNAME: |
975da2c0 | 294 | return lttng_add_hostname_to_ctx(ctx); |
606828e4 | 295 | case LTTNG_KERNEL_ABI_CONTEXT_CPU_ID: |
b3699d90 | 296 | return lttng_add_cpu_id_to_ctx(ctx); |
606828e4 | 297 | case LTTNG_KERNEL_ABI_CONTEXT_INTERRUPTIBLE: |
79150a49 | 298 | return lttng_add_interruptible_to_ctx(ctx); |
606828e4 | 299 | case LTTNG_KERNEL_ABI_CONTEXT_NEED_RESCHEDULE: |
79150a49 | 300 | return lttng_add_need_reschedule_to_ctx(ctx); |
606828e4 | 301 | case LTTNG_KERNEL_ABI_CONTEXT_PREEMPTIBLE: |
79150a49 | 302 | return lttng_add_preemptible_to_ctx(ctx); |
606828e4 | 303 | case LTTNG_KERNEL_ABI_CONTEXT_MIGRATABLE: |
79150a49 | 304 | return lttng_add_migratable_to_ctx(ctx); |
606828e4 MD |
305 | case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_KERNEL: |
306 | case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_USER: | |
2fa2d39a | 307 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); |
606828e4 | 308 | case LTTNG_KERNEL_ABI_CONTEXT_CGROUP_NS: |
a6cf40a4 | 309 | return lttng_add_cgroup_ns_to_ctx(ctx); |
606828e4 | 310 | case LTTNG_KERNEL_ABI_CONTEXT_IPC_NS: |
a6cf40a4 | 311 | return lttng_add_ipc_ns_to_ctx(ctx); |
606828e4 | 312 | case LTTNG_KERNEL_ABI_CONTEXT_MNT_NS: |
a6cf40a4 | 313 | return lttng_add_mnt_ns_to_ctx(ctx); |
606828e4 | 314 | case LTTNG_KERNEL_ABI_CONTEXT_NET_NS: |
a6cf40a4 | 315 | return lttng_add_net_ns_to_ctx(ctx); |
606828e4 | 316 | case LTTNG_KERNEL_ABI_CONTEXT_PID_NS: |
a6cf40a4 | 317 | return lttng_add_pid_ns_to_ctx(ctx); |
606828e4 | 318 | case LTTNG_KERNEL_ABI_CONTEXT_USER_NS: |
a6cf40a4 | 319 | return lttng_add_user_ns_to_ctx(ctx); |
606828e4 | 320 | case LTTNG_KERNEL_ABI_CONTEXT_UTS_NS: |
a6cf40a4 | 321 | return lttng_add_uts_ns_to_ctx(ctx); |
606828e4 | 322 | case LTTNG_KERNEL_ABI_CONTEXT_UID: |
dc923e75 | 323 | return lttng_add_uid_to_ctx(ctx); |
606828e4 | 324 | case LTTNG_KERNEL_ABI_CONTEXT_EUID: |
dc923e75 | 325 | return lttng_add_euid_to_ctx(ctx); |
606828e4 | 326 | case LTTNG_KERNEL_ABI_CONTEXT_SUID: |
dc923e75 | 327 | return lttng_add_suid_to_ctx(ctx); |
606828e4 | 328 | case LTTNG_KERNEL_ABI_CONTEXT_GID: |
dc923e75 | 329 | return lttng_add_gid_to_ctx(ctx); |
606828e4 | 330 | case LTTNG_KERNEL_ABI_CONTEXT_EGID: |
dc923e75 | 331 | return lttng_add_egid_to_ctx(ctx); |
606828e4 | 332 | case LTTNG_KERNEL_ABI_CONTEXT_SGID: |
dc923e75 | 333 | return lttng_add_sgid_to_ctx(ctx); |
606828e4 | 334 | case LTTNG_KERNEL_ABI_CONTEXT_VUID: |
dc923e75 | 335 | return lttng_add_vuid_to_ctx(ctx); |
606828e4 | 336 | case LTTNG_KERNEL_ABI_CONTEXT_VEUID: |
dc923e75 | 337 | return lttng_add_veuid_to_ctx(ctx); |
606828e4 | 338 | case LTTNG_KERNEL_ABI_CONTEXT_VSUID: |
dc923e75 | 339 | return lttng_add_vsuid_to_ctx(ctx); |
606828e4 | 340 | case LTTNG_KERNEL_ABI_CONTEXT_VGID: |
dc923e75 | 341 | return lttng_add_vgid_to_ctx(ctx); |
606828e4 | 342 | case LTTNG_KERNEL_ABI_CONTEXT_VEGID: |
dc923e75 | 343 | return lttng_add_vegid_to_ctx(ctx); |
606828e4 | 344 | case LTTNG_KERNEL_ABI_CONTEXT_VSGID: |
dc923e75 | 345 | return lttng_add_vsgid_to_ctx(ctx); |
606828e4 | 346 | case LTTNG_KERNEL_ABI_CONTEXT_TIME_NS: |
876e2e92 | 347 | return lttng_add_time_ns_to_ctx(ctx); |
8070f5c0 MD |
348 | default: |
349 | return -EINVAL; | |
350 | } | |
351 | } | |
352 | ||
ad1c05e1 MD |
353 | /** |
354 | * lttng_ioctl - lttng syscall through ioctl | |
355 | * | |
c0e31d2e | 356 | * @file: the file |
ad1c05e1 MD |
357 | * @cmd: the command |
358 | * @arg: command arg | |
359 | * | |
360 | * This ioctl implements lttng commands: | |
606828e4 | 361 | * LTTNG_KERNEL_ABI_SESSION |
ad1c05e1 | 362 | * Returns a LTTng trace session file descriptor |
606828e4 | 363 | * LTTNG_KERNEL_ABI_TRACER_VERSION |
271b6681 | 364 | * Returns the LTTng kernel tracer version |
606828e4 | 365 | * LTTNG_KERNEL_ABI_TRACEPOINT_LIST |
271b6681 | 366 | * Returns a file descriptor listing available tracepoints |
606828e4 | 367 | * LTTNG_KERNEL_ABI_WAIT_QUIESCENT |
360f38ea | 368 | * Returns after all previously running probes have completed |
606828e4 | 369 | * LTTNG_KERNEL_ABI_TRACER_ABI_VERSION |
42cabb80 | 370 | * Returns the LTTng kernel tracer ABI version |
606828e4 | 371 | * LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE |
750b05f2 | 372 | * Returns a LTTng event notifier group file descriptor |
ad1c05e1 MD |
373 | * |
374 | * The returned session will be deleted when its file descriptor is closed. | |
375 | */ | |
376 | static | |
c0e31d2e | 377 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
378 | { |
379 | switch (cmd) { | |
606828e4 MD |
380 | case LTTNG_KERNEL_ABI_OLD_SESSION: |
381 | case LTTNG_KERNEL_ABI_SESSION: | |
ad1c05e1 | 382 | return lttng_abi_create_session(); |
606828e4 | 383 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE: |
750b05f2 | 384 | return lttng_abi_create_event_notifier_group(); |
606828e4 | 385 | case LTTNG_KERNEL_ABI_OLD_TRACER_VERSION: |
6dccd6c1 | 386 | { |
606828e4 MD |
387 | struct lttng_kernel_abi_tracer_version v; |
388 | struct lttng_kernel_abi_old_tracer_version oldv; | |
389 | struct lttng_kernel_abi_old_tracer_version *uversion = | |
390 | (struct lttng_kernel_abi_old_tracer_version __user *) arg; | |
6dccd6c1 JD |
391 | |
392 | lttng_abi_tracer_version(&v); | |
393 | oldv.major = v.major; | |
394 | oldv.minor = v.minor; | |
395 | oldv.patchlevel = v.patchlevel; | |
396 | ||
397 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
398 | return -EFAULT; | |
399 | return 0; | |
400 | } | |
606828e4 | 401 | case LTTNG_KERNEL_ABI_TRACER_VERSION: |
6dccd6c1 | 402 | { |
606828e4 MD |
403 | struct lttng_kernel_abi_tracer_version version; |
404 | struct lttng_kernel_abi_tracer_version *uversion = | |
405 | (struct lttng_kernel_abi_tracer_version __user *) arg; | |
6dccd6c1 JD |
406 | |
407 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
408 | |
409 | if (copy_to_user(uversion, &version, sizeof(version))) | |
410 | return -EFAULT; | |
411 | return 0; | |
412 | } | |
606828e4 | 413 | case LTTNG_KERNEL_ABI_TRACER_ABI_VERSION: |
42cabb80 | 414 | { |
606828e4 MD |
415 | struct lttng_kernel_abi_tracer_abi_version version; |
416 | struct lttng_kernel_abi_tracer_abi_version *uversion = | |
417 | (struct lttng_kernel_abi_tracer_abi_version __user *) arg; | |
42cabb80 MD |
418 | |
419 | lttng_abi_tracer_abi_version(&version); | |
420 | ||
6dccd6c1 JD |
421 | if (copy_to_user(uversion, &version, sizeof(version))) |
422 | return -EFAULT; | |
423 | return 0; | |
424 | } | |
606828e4 MD |
425 | case LTTNG_KERNEL_ABI_OLD_TRACEPOINT_LIST: |
426 | case LTTNG_KERNEL_ABI_TRACEPOINT_LIST: | |
271b6681 | 427 | return lttng_abi_tracepoint_list(); |
606828e4 | 428 | case LTTNG_KERNEL_ABI_SYSCALL_LIST: |
2d2464bd | 429 | return lttng_abi_syscall_list(); |
606828e4 MD |
430 | case LTTNG_KERNEL_ABI_OLD_WAIT_QUIESCENT: |
431 | case LTTNG_KERNEL_ABI_WAIT_QUIESCENT: | |
5f7f9078 MD |
432 | synchronize_trace(); |
433 | return 0; | |
606828e4 | 434 | case LTTNG_KERNEL_ABI_OLD_CALIBRATE: |
6dccd6c1 | 435 | { |
606828e4 MD |
436 | struct lttng_kernel_abi_old_calibrate __user *ucalibrate = |
437 | (struct lttng_kernel_abi_old_calibrate __user *) arg; | |
438 | struct lttng_kernel_abi_old_calibrate old_calibrate; | |
439 | struct lttng_kernel_abi_calibrate calibrate; | |
6dccd6c1 JD |
440 | int ret; |
441 | ||
442 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
443 | return -EFAULT; | |
444 | calibrate.type = old_calibrate.type; | |
445 | ret = lttng_calibrate(&calibrate); | |
446 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
447 | return -EFAULT; | |
448 | return ret; | |
449 | } | |
606828e4 | 450 | case LTTNG_KERNEL_ABI_CALIBRATE: |
57105fc2 | 451 | { |
606828e4 MD |
452 | struct lttng_kernel_abi_calibrate __user *ucalibrate = |
453 | (struct lttng_kernel_abi_calibrate __user *) arg; | |
454 | struct lttng_kernel_abi_calibrate calibrate; | |
57105fc2 MD |
455 | int ret; |
456 | ||
457 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
458 | return -EFAULT; | |
459 | ret = lttng_calibrate(&calibrate); | |
460 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
461 | return -EFAULT; | |
462 | return ret; | |
463 | } | |
ad1c05e1 MD |
464 | default: |
465 | return -ENOIOCTLCMD; | |
466 | } | |
467 | } | |
468 | ||
5f4c791e | 469 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
470 | static const struct proc_ops lttng_proc_ops = { |
471 | .proc_ioctl = lttng_ioctl, | |
472 | #ifdef CONFIG_COMPAT | |
473 | .proc_compat_ioctl = lttng_ioctl, | |
474 | #endif /* CONFIG_COMPAT */ | |
475 | }; | |
476 | #else | |
477 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 478 | .owner = THIS_MODULE, |
ad1c05e1 MD |
479 | .unlocked_ioctl = lttng_ioctl, |
480 | #ifdef CONFIG_COMPAT | |
03037b98 | 481 | .compat_ioctl = lttng_ioctl, |
059de147 | 482 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 483 | }; |
059de147 | 484 | #endif |
ad1c05e1 | 485 | |
5dbbdb43 | 486 | static |
c0e31d2e | 487 | int lttng_abi_create_channel(struct file *session_file, |
606828e4 | 488 | struct lttng_kernel_abi_channel *chan_param, |
5dbbdb43 | 489 | enum channel_type channel_type) |
baf20995 | 490 | { |
a90917c3 | 491 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 492 | const struct file_operations *fops = NULL; |
5dbbdb43 | 493 | const char *transport_name; |
a90917c3 | 494 | struct lttng_channel *chan; |
c0e31d2e | 495 | struct file *chan_file; |
baf20995 | 496 | int chan_fd; |
ad1c05e1 | 497 | int ret = 0; |
baf20995 | 498 | |
4ac10b76 | 499 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
500 | if (chan_fd < 0) { |
501 | ret = chan_fd; | |
502 | goto fd_error; | |
503 | } | |
88dfd899 MD |
504 | switch (channel_type) { |
505 | case PER_CPU_CHANNEL: | |
506 | fops = <tng_channel_fops; | |
507 | break; | |
508 | case METADATA_CHANNEL: | |
509 | fops = <tng_metadata_fops; | |
510 | break; | |
511 | } | |
2470a237 | 512 | |
c0e31d2e | 513 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 514 | fops, |
03037b98 | 515 | NULL, O_RDWR); |
c0e31d2e MD |
516 | if (IS_ERR(chan_file)) { |
517 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
518 | goto file_error; |
519 | } | |
5dbbdb43 MD |
520 | switch (channel_type) { |
521 | case PER_CPU_CHANNEL: | |
606828e4 | 522 | if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) { |
6dccd6c1 | 523 | transport_name = chan_param->overwrite ? |
96ba7208 | 524 | "relay-overwrite" : "relay-discard"; |
606828e4 | 525 | } else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) { |
6dccd6c1 | 526 | transport_name = chan_param->overwrite ? |
96ba7208 JD |
527 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
528 | } else { | |
529 | return -EINVAL; | |
530 | } | |
5dbbdb43 | 531 | break; |
5dbbdb43 | 532 | case METADATA_CHANNEL: |
606828e4 | 533 | if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) |
96ba7208 | 534 | transport_name = "relay-metadata"; |
606828e4 | 535 | else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) |
96ba7208 JD |
536 | transport_name = "relay-metadata-mmap"; |
537 | else | |
538 | return -EINVAL; | |
5dbbdb43 MD |
539 | break; |
540 | default: | |
541 | transport_name = "<unknown>"; | |
542 | break; | |
543 | } | |
98d7281c MJ |
544 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
545 | ret = -EOVERFLOW; | |
9c1f4643 MD |
546 | goto refcount_error; |
547 | } | |
03037b98 MD |
548 | /* |
549 | * We tolerate no failure path after channel creation. It will stay | |
550 | * invariant for the rest of the session. | |
551 | */ | |
a90917c3 | 552 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
553 | chan_param->subbuf_size, |
554 | chan_param->num_subbuf, | |
555 | chan_param->switch_timer_interval, | |
d83004aa JD |
556 | chan_param->read_timer_interval, |
557 | channel_type); | |
03037b98 | 558 | if (!chan) { |
f3d01b96 | 559 | ret = -EINVAL; |
03037b98 MD |
560 | goto chan_error; |
561 | } | |
11b5a3c2 | 562 | chan->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, | |
606828e4 | 580 | struct lttng_kernel_abi_session_name *name) |
7f859fbf JR |
581 | { |
582 | size_t len; | |
583 | ||
606828e4 | 584 | len = strnlen(name->name, LTTNG_KERNEL_ABI_SESSION_NAME_LEN); |
7f859fbf | 585 | |
606828e4 | 586 | if (len == LTTNG_KERNEL_ABI_SESSION_NAME_LEN) { |
7f859fbf JR |
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, | |
606828e4 | 597 | struct lttng_kernel_abi_session_creation_time *time) |
1c88f269 JR |
598 | { |
599 | size_t len; | |
600 | ||
606828e4 | 601 | len = strnlen(time->iso8601, LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN); |
1c88f269 | 602 | |
606828e4 | 603 | if (len == LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN) { |
1c88f269 JR |
604 | /* Time is too long/malformed */ |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | strcpy(session->creation_time, time->iso8601); | |
609 | return 0; | |
610 | } | |
611 | ||
99f52fcc FD |
612 | static |
613 | int lttng_counter_release(struct inode *inode, struct file *file) | |
614 | { | |
615 | struct lttng_counter *counter = file->private_data; | |
616 | ||
617 | if (counter) { | |
618 | /* | |
619 | * Do not destroy the counter itself. Wait of the owner | |
620 | * (event_notifier group) to be destroyed. | |
621 | */ | |
622 | fput(counter->owner); | |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | static | |
629 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
630 | { | |
631 | struct lttng_counter *counter = file->private_data; | |
606828e4 | 632 | size_t indexes[LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX] = { 0 }; |
99f52fcc FD |
633 | int i; |
634 | ||
635 | switch (cmd) { | |
606828e4 | 636 | case LTTNG_KERNEL_ABI_COUNTER_READ: |
99f52fcc | 637 | { |
606828e4 MD |
638 | struct lttng_kernel_abi_counter_read local_counter_read; |
639 | struct lttng_kernel_abi_counter_read __user *ucounter_read = | |
640 | (struct lttng_kernel_abi_counter_read __user *) arg; | |
99f52fcc FD |
641 | bool overflow, underflow; |
642 | int64_t value; | |
643 | int32_t cpu; | |
644 | int ret; | |
645 | ||
646 | if (copy_from_user(&local_counter_read, ucounter_read, | |
647 | sizeof(local_counter_read))) | |
648 | return -EFAULT; | |
649 | if (validate_zeroed_padding(local_counter_read.padding, | |
650 | sizeof(local_counter_read.padding))) | |
651 | return -EINVAL; | |
652 | ||
653 | /* Cast all indexes into size_t. */ | |
654 | for (i = 0; i < local_counter_read.index.number_dimensions; i++) | |
655 | indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i]; | |
656 | cpu = local_counter_read.cpu; | |
657 | ||
658 | ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, | |
659 | &overflow, &underflow); | |
660 | if (ret) | |
661 | return ret; | |
662 | local_counter_read.value.value = value; | |
663 | local_counter_read.value.overflow = overflow; | |
664 | local_counter_read.value.underflow = underflow; | |
665 | ||
666 | if (copy_to_user(&ucounter_read->value, &local_counter_read.value, | |
667 | sizeof(local_counter_read.value))) | |
668 | return -EFAULT; | |
669 | ||
670 | return 0; | |
671 | } | |
606828e4 | 672 | case LTTNG_KERNEL_ABI_COUNTER_AGGREGATE: |
99f52fcc | 673 | { |
606828e4 MD |
674 | struct lttng_kernel_abi_counter_aggregate local_counter_aggregate; |
675 | struct lttng_kernel_abi_counter_aggregate __user *ucounter_aggregate = | |
676 | (struct lttng_kernel_abi_counter_aggregate __user *) arg; | |
99f52fcc FD |
677 | bool overflow, underflow; |
678 | int64_t value; | |
679 | int ret; | |
680 | ||
681 | if (copy_from_user(&local_counter_aggregate, ucounter_aggregate, | |
682 | sizeof(local_counter_aggregate))) | |
683 | return -EFAULT; | |
684 | if (validate_zeroed_padding(local_counter_aggregate.padding, | |
685 | sizeof(local_counter_aggregate.padding))) | |
686 | return -EINVAL; | |
687 | ||
688 | /* Cast all indexes into size_t. */ | |
689 | for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++) | |
690 | indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i]; | |
691 | ||
692 | ret = lttng_kernel_counter_aggregate(counter, indexes, &value, | |
693 | &overflow, &underflow); | |
694 | if (ret) | |
695 | return ret; | |
696 | local_counter_aggregate.value.value = value; | |
697 | local_counter_aggregate.value.overflow = overflow; | |
698 | local_counter_aggregate.value.underflow = underflow; | |
699 | ||
700 | if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value, | |
701 | sizeof(local_counter_aggregate.value))) | |
702 | return -EFAULT; | |
703 | ||
704 | return 0; | |
705 | } | |
606828e4 | 706 | case LTTNG_KERNEL_ABI_COUNTER_CLEAR: |
99f52fcc | 707 | { |
606828e4 MD |
708 | struct lttng_kernel_abi_counter_clear local_counter_clear; |
709 | struct lttng_kernel_abi_counter_clear __user *ucounter_clear = | |
710 | (struct lttng_kernel_abi_counter_clear __user *) arg; | |
99f52fcc FD |
711 | |
712 | if (copy_from_user(&local_counter_clear, ucounter_clear, | |
713 | sizeof(local_counter_clear))) | |
714 | return -EFAULT; | |
715 | if (validate_zeroed_padding(local_counter_clear.padding, | |
716 | sizeof(local_counter_clear.padding))) | |
717 | return -EINVAL; | |
718 | ||
719 | /* Cast all indexes into size_t. */ | |
720 | for (i = 0; i < local_counter_clear.index.number_dimensions; i++) | |
721 | indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i]; | |
722 | ||
723 | return lttng_kernel_counter_clear(counter, indexes); | |
724 | } | |
725 | default: | |
726 | WARN_ON_ONCE(1); | |
727 | return -ENOSYS; | |
728 | } | |
729 | } | |
730 | ||
731 | static const struct file_operations lttng_counter_fops = { | |
732 | .owner = THIS_MODULE, | |
733 | .release = lttng_counter_release, | |
734 | .unlocked_ioctl = lttng_counter_ioctl, | |
735 | #ifdef CONFIG_COMPAT | |
736 | .compat_ioctl = lttng_counter_ioctl, | |
737 | #endif | |
738 | }; | |
739 | ||
740 | ||
d1f652f8 | 741 | static |
606828e4 | 742 | enum tracker_type get_tracker_type(struct lttng_kernel_abi_tracker_args *tracker) |
d1f652f8 MD |
743 | { |
744 | switch (tracker->type) { | |
606828e4 | 745 | case LTTNG_KERNEL_ABI_TRACKER_PID: |
d1f652f8 | 746 | return TRACKER_PID; |
606828e4 | 747 | case LTTNG_KERNEL_ABI_TRACKER_VPID: |
d1f652f8 | 748 | return TRACKER_VPID; |
606828e4 | 749 | case LTTNG_KERNEL_ABI_TRACKER_UID: |
d1f652f8 | 750 | return TRACKER_UID; |
606828e4 | 751 | case LTTNG_KERNEL_ABI_TRACKER_VUID: |
d1f652f8 | 752 | return TRACKER_VUID; |
606828e4 | 753 | case LTTNG_KERNEL_ABI_TRACKER_GID: |
d1f652f8 | 754 | return TRACKER_GID; |
606828e4 | 755 | case LTTNG_KERNEL_ABI_TRACKER_VGID: |
d1f652f8 MD |
756 | return TRACKER_VGID; |
757 | default: | |
758 | return TRACKER_UNKNOWN; | |
759 | } | |
760 | } | |
761 | ||
baf20995 | 762 | /** |
ad1c05e1 | 763 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 764 | * |
c0e31d2e | 765 | * @file: the file |
baf20995 MD |
766 | * @cmd: the command |
767 | * @arg: command arg | |
768 | * | |
769 | * This ioctl implements lttng commands: | |
606828e4 | 770 | * LTTNG_KERNEL_ABI_CHANNEL |
baf20995 | 771 | * Returns a LTTng channel file descriptor |
606828e4 | 772 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 773 | * Enables tracing for a session (weak enable) |
606828e4 | 774 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 775 | * Disables tracing for a session (strong disable) |
606828e4 | 776 | * LTTNG_KERNEL_ABI_METADATA |
8070f5c0 | 777 | * Returns a LTTng metadata file descriptor |
606828e4 | 778 | * LTTNG_KERNEL_ABI_SESSION_TRACK_PID |
d1f652f8 | 779 | * Add PID to session PID tracker |
606828e4 | 780 | * LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID |
d1f652f8 | 781 | * Remove PID from session PID tracker |
606828e4 | 782 | * LTTNG_KERNEL_ABI_SESSION_TRACK_ID |
d1f652f8 | 783 | * Add ID to tracker |
606828e4 | 784 | * LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID |
d1f652f8 | 785 | * Remove ID from tracker |
ad1c05e1 MD |
786 | * |
787 | * The returned channel will be deleted when its file descriptor is closed. | |
788 | */ | |
789 | static | |
c0e31d2e | 790 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 791 | { |
a90917c3 | 792 | struct lttng_session *session = file->private_data; |
606828e4 MD |
793 | struct lttng_kernel_abi_channel chan_param; |
794 | struct lttng_kernel_abi_old_channel old_chan_param; | |
c0e31d2e | 795 | |
ad1c05e1 | 796 | switch (cmd) { |
606828e4 | 797 | case LTTNG_KERNEL_ABI_OLD_CHANNEL: |
6dccd6c1 | 798 | { |
6dccd6c1 | 799 | if (copy_from_user(&old_chan_param, |
606828e4 MD |
800 | (struct lttng_kernel_abi_old_channel __user *) arg, |
801 | sizeof(struct lttng_kernel_abi_old_channel))) | |
6dccd6c1 JD |
802 | return -EFAULT; |
803 | chan_param.overwrite = old_chan_param.overwrite; | |
804 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
805 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
806 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
807 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
808 | chan_param.output = old_chan_param.output; | |
809 | ||
810 | return lttng_abi_create_channel(file, &chan_param, | |
811 | PER_CPU_CHANNEL); | |
812 | } | |
606828e4 | 813 | case LTTNG_KERNEL_ABI_CHANNEL: |
6dccd6c1 | 814 | { |
6dccd6c1 | 815 | if (copy_from_user(&chan_param, |
606828e4 MD |
816 | (struct lttng_kernel_abi_channel __user *) arg, |
817 | sizeof(struct lttng_kernel_abi_channel))) | |
6dccd6c1 JD |
818 | return -EFAULT; |
819 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 820 | PER_CPU_CHANNEL); |
6dccd6c1 | 821 | } |
606828e4 MD |
822 | case LTTNG_KERNEL_ABI_OLD_SESSION_START: |
823 | case LTTNG_KERNEL_ABI_OLD_ENABLE: | |
824 | case LTTNG_KERNEL_ABI_SESSION_START: | |
825 | case LTTNG_KERNEL_ABI_ENABLE: | |
a90917c3 | 826 | return lttng_session_enable(session); |
606828e4 MD |
827 | case LTTNG_KERNEL_ABI_OLD_SESSION_STOP: |
828 | case LTTNG_KERNEL_ABI_OLD_DISABLE: | |
829 | case LTTNG_KERNEL_ABI_SESSION_STOP: | |
830 | case LTTNG_KERNEL_ABI_DISABLE: | |
a90917c3 | 831 | return lttng_session_disable(session); |
606828e4 | 832 | case LTTNG_KERNEL_ABI_OLD_METADATA: |
6dccd6c1 | 833 | { |
6dccd6c1 | 834 | if (copy_from_user(&old_chan_param, |
606828e4 MD |
835 | (struct lttng_kernel_abi_old_channel __user *) arg, |
836 | sizeof(struct lttng_kernel_abi_old_channel))) | |
6dccd6c1 JD |
837 | return -EFAULT; |
838 | chan_param.overwrite = old_chan_param.overwrite; | |
839 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
840 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
841 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
842 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
843 | chan_param.output = old_chan_param.output; | |
844 | ||
845 | return lttng_abi_create_channel(file, &chan_param, | |
846 | METADATA_CHANNEL); | |
847 | } | |
606828e4 | 848 | case LTTNG_KERNEL_ABI_METADATA: |
6dccd6c1 | 849 | { |
6dccd6c1 | 850 | if (copy_from_user(&chan_param, |
606828e4 MD |
851 | (struct lttng_kernel_abi_channel __user *) arg, |
852 | sizeof(struct lttng_kernel_abi_channel))) | |
6dccd6c1 JD |
853 | return -EFAULT; |
854 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 855 | METADATA_CHANNEL); |
6dccd6c1 | 856 | } |
606828e4 | 857 | case LTTNG_KERNEL_ABI_SESSION_TRACK_PID: |
d1f652f8 | 858 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
606828e4 | 859 | case LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID: |
d1f652f8 | 860 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
606828e4 | 861 | case LTTNG_KERNEL_ABI_SESSION_TRACK_ID: |
d1f652f8 | 862 | { |
606828e4 | 863 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
864 | enum tracker_type tracker_type; |
865 | ||
866 | if (copy_from_user(&tracker, | |
606828e4 MD |
867 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
868 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
869 | return -EFAULT; |
870 | tracker_type = get_tracker_type(&tracker); | |
871 | if (tracker_type == TRACKER_UNKNOWN) | |
872 | return -EINVAL; | |
873 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
874 | } | |
606828e4 | 875 | case LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID: |
d1f652f8 | 876 | { |
606828e4 | 877 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
878 | enum tracker_type tracker_type; |
879 | ||
880 | if (copy_from_user(&tracker, | |
606828e4 MD |
881 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
882 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
883 | return -EFAULT; |
884 | tracker_type = get_tracker_type(&tracker); | |
885 | if (tracker_type == TRACKER_UNKNOWN) | |
886 | return -EINVAL; | |
887 | return lttng_session_untrack_id(session, tracker_type, | |
888 | tracker.id); | |
889 | } | |
606828e4 | 890 | case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 | 891 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
606828e4 | 892 | case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS: |
d1f652f8 | 893 | { |
606828e4 | 894 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
895 | enum tracker_type tracker_type; |
896 | ||
897 | if (copy_from_user(&tracker, | |
606828e4 MD |
898 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
899 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
900 | return -EFAULT; |
901 | tracker_type = get_tracker_type(&tracker); | |
902 | if (tracker_type == TRACKER_UNKNOWN) | |
903 | return -EINVAL; | |
904 | return lttng_session_list_tracker_ids(session, tracker_type); | |
905 | } | |
606828e4 | 906 | case LTTNG_KERNEL_ABI_SESSION_METADATA_REGEN: |
9616f0bf | 907 | return lttng_session_metadata_regenerate(session); |
606828e4 | 908 | case LTTNG_KERNEL_ABI_SESSION_STATEDUMP: |
601252cf | 909 | return lttng_session_statedump(session); |
606828e4 | 910 | case LTTNG_KERNEL_ABI_SESSION_SET_NAME: |
7f859fbf | 911 | { |
606828e4 | 912 | struct lttng_kernel_abi_session_name name; |
7f859fbf JR |
913 | |
914 | if (copy_from_user(&name, | |
606828e4 MD |
915 | (struct lttng_kernel_abi_session_name __user *) arg, |
916 | sizeof(struct lttng_kernel_abi_session_name))) | |
7f859fbf JR |
917 | return -EFAULT; |
918 | return lttng_abi_session_set_name(session, &name); | |
919 | } | |
606828e4 | 920 | case LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME: |
1c88f269 | 921 | { |
606828e4 | 922 | struct lttng_kernel_abi_session_creation_time time; |
1c88f269 JR |
923 | |
924 | if (copy_from_user(&time, | |
606828e4 MD |
925 | (struct lttng_kernel_abi_session_creation_time __user *) arg, |
926 | sizeof(struct lttng_kernel_abi_session_creation_time))) | |
1c88f269 JR |
927 | return -EFAULT; |
928 | return lttng_abi_session_set_creation_time(session, &time); | |
929 | } | |
ad1c05e1 MD |
930 | default: |
931 | return -ENOIOCTLCMD; | |
932 | } | |
933 | } | |
934 | ||
03037b98 MD |
935 | /* |
936 | * Called when the last file reference is dropped. | |
937 | * | |
938 | * Big fat note: channels and events are invariant for the whole session after | |
939 | * their creation. So this session destruction also destroys all channel and | |
940 | * event structures specific to this session (they are not destroyed when their | |
941 | * individual file is released). | |
942 | */ | |
ad1c05e1 | 943 | static |
03037b98 | 944 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 945 | { |
a90917c3 | 946 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
947 | |
948 | if (session) | |
a90917c3 | 949 | lttng_session_destroy(session); |
11b5a3c2 | 950 | return 0; |
ad1c05e1 | 951 | } |
ad1c05e1 MD |
952 | |
953 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 954 | .owner = THIS_MODULE, |
03037b98 | 955 | .release = lttng_session_release, |
ad1c05e1 MD |
956 | .unlocked_ioctl = lttng_session_ioctl, |
957 | #ifdef CONFIG_COMPAT | |
03037b98 | 958 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 959 | #endif |
11b5a3c2 | 960 | }; |
ad1c05e1 | 961 | |
db2511b4 MD |
962 | /* |
963 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
964 | * and retry (if new data available to read after flush). | |
965 | */ | |
966 | static | |
967 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
968 | size_t count, loff_t *ppos) | |
969 | { | |
970 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
971 | struct channel *chan = event_notifier_group->chan; | |
972 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
973 | ssize_t read_count = 0, len; | |
974 | size_t read_offset; | |
975 | ||
976 | might_sleep(); | |
977 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
978 | return -EFAULT; | |
979 | ||
980 | /* Finish copy of previous record */ | |
981 | if (*ppos != 0) { | |
982 | if (read_count < count) { | |
983 | len = chan->iter.len_left; | |
984 | read_offset = *ppos; | |
985 | goto skip_get_next; | |
986 | } | |
987 | } | |
988 | ||
989 | while (read_count < count) { | |
990 | size_t copy_len, space_left; | |
991 | ||
992 | len = lib_ring_buffer_get_next_record(chan, buf); | |
993 | len_test: | |
994 | if (len < 0) { | |
995 | /* | |
996 | * Check if buffer is finalized (end of file). | |
997 | */ | |
998 | if (len == -ENODATA) { | |
999 | /* A 0 read_count will tell about end of file */ | |
1000 | goto nodata; | |
1001 | } | |
1002 | if (filp->f_flags & O_NONBLOCK) { | |
1003 | if (!read_count) | |
1004 | read_count = -EAGAIN; | |
1005 | goto nodata; | |
1006 | } else { | |
1007 | int error; | |
1008 | ||
1009 | /* | |
1010 | * No data available at the moment, return what | |
1011 | * we got. | |
1012 | */ | |
1013 | if (read_count) | |
1014 | goto nodata; | |
1015 | ||
1016 | /* | |
1017 | * Wait for returned len to be >= 0 or -ENODATA. | |
1018 | */ | |
1019 | error = wait_event_interruptible( | |
1020 | event_notifier_group->read_wait, | |
1021 | ((len = lib_ring_buffer_get_next_record( | |
1022 | chan, buf)), len != -EAGAIN)); | |
1023 | CHAN_WARN_ON(chan, len == -EBUSY); | |
1024 | if (error) { | |
1025 | read_count = error; | |
1026 | goto nodata; | |
1027 | } | |
1028 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
1029 | goto len_test; | |
1030 | } | |
1031 | } | |
1032 | read_offset = buf->iter.read_offset; | |
1033 | skip_get_next: | |
1034 | space_left = count - read_count; | |
1035 | if (len <= space_left) { | |
1036 | copy_len = len; | |
1037 | chan->iter.len_left = 0; | |
1038 | *ppos = 0; | |
1039 | } else { | |
1040 | copy_len = space_left; | |
1041 | chan->iter.len_left = len - copy_len; | |
1042 | *ppos = read_offset + copy_len; | |
1043 | } | |
1044 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
1045 | &user_buf[read_count], | |
1046 | copy_len)) { | |
1047 | /* | |
1048 | * Leave the len_left and ppos values at their current | |
1049 | * state, as we currently have a valid event to read. | |
1050 | */ | |
1051 | return -EFAULT; | |
1052 | } | |
1053 | read_count += copy_len; | |
1054 | } | |
31c02fb7 | 1055 | goto put_record; |
db2511b4 MD |
1056 | |
1057 | nodata: | |
1058 | *ppos = 0; | |
1059 | chan->iter.len_left = 0; | |
31c02fb7 MD |
1060 | |
1061 | put_record: | |
1062 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1063 | return read_count; |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1068 | * there is data available. Perform a ring buffer flush if we encounter a | |
1069 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1070 | */ | |
1071 | static | |
1072 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1073 | poll_table *wait) | |
1074 | { | |
1075 | unsigned int mask = 0; | |
1076 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
1077 | struct channel *chan = event_notifier_group->chan; | |
1078 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1079 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1080 | int finalized, disabled; | |
1081 | unsigned long consumed, offset; | |
18f12d55 | 1082 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1083 | |
1084 | if (filp->f_mode & FMODE_READ) { | |
1085 | poll_wait_set_exclusive(wait); | |
1086 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1087 | ||
1088 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1089 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1090 | ||
1091 | /* | |
1092 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1093 | * finalized load before offsets loads. | |
1094 | */ | |
1095 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1096 | retry: | |
1097 | if (disabled) | |
1098 | return POLLERR; | |
1099 | ||
1100 | offset = lib_ring_buffer_get_offset(config, buf); | |
1101 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1102 | ||
1103 | /* | |
1104 | * If there is no buffer available to consume. | |
1105 | */ | |
1106 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1107 | /* | |
1108 | * If there is a non-empty subbuffer, flush and try again. | |
1109 | */ | |
18f12d55 | 1110 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1111 | lib_ring_buffer_switch_remote(buf); |
1112 | goto retry; | |
1113 | } | |
1114 | ||
1115 | if (finalized) | |
1116 | return POLLHUP; | |
1117 | else { | |
1118 | /* | |
1119 | * The memory barriers | |
1120 | * __wait_event()/wake_up_interruptible() take | |
1121 | * care of "raw_spin_is_locked" memory ordering. | |
1122 | */ | |
1123 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1124 | goto retry; | |
1125 | else | |
1126 | return 0; | |
1127 | } | |
1128 | } else { | |
1129 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1130 | >= chan->backend.buf_size) | |
1131 | return POLLPRI | POLLRDBAND; | |
1132 | else | |
1133 | return POLLIN | POLLRDNORM; | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | return mask; | |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1142 | * @inode: opened inode | |
1143 | * @file: opened file | |
1144 | * | |
1145 | * Open implementation. Makes sure only one open instance of a buffer is | |
1146 | * done at a given moment. | |
1147 | */ | |
1148 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1149 | { | |
1150 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
1151 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1152 | ||
1153 | file->private_data = event_notifier_group; | |
1154 | return lib_ring_buffer_open(inode, file, buf); | |
1155 | } | |
1156 | ||
1157 | /** | |
1158 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1159 | * @inode: opened inode | |
1160 | * @file: opened file | |
1161 | * | |
1162 | * Release implementation. | |
1163 | */ | |
1164 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1165 | { | |
1166 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
1167 | struct lib_ring_buffer *buf = event_notifier_group->buf; | |
1168 | int ret; | |
1169 | ||
1170 | ret = lib_ring_buffer_release(inode, file, buf); | |
1171 | if (ret) | |
1172 | return ret; | |
1173 | fput(event_notifier_group->file); | |
1174 | return 0; | |
1175 | } | |
1176 | ||
21f58fb7 FD |
1177 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1178 | .owner = THIS_MODULE, | |
db2511b4 MD |
1179 | .open = lttng_event_notifier_group_notif_open, |
1180 | .release = lttng_event_notifier_group_notif_release, | |
1181 | .read = lttng_event_notifier_group_notif_read, | |
1182 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1183 | }; |
1184 | ||
d83004aa JD |
1185 | /** |
1186 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1187 | * @filp: the file | |
1188 | * @wait: poll table | |
1189 | * | |
1190 | * Handles the poll operations for the metadata channels. | |
1191 | */ | |
ad1c05e1 | 1192 | static |
d83004aa JD |
1193 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1194 | poll_table *wait) | |
1195 | { | |
1196 | struct lttng_metadata_stream *stream = filp->private_data; | |
1197 | struct lib_ring_buffer *buf = stream->priv; | |
1198 | int finalized; | |
1199 | unsigned int mask = 0; | |
1200 | ||
1201 | if (filp->f_mode & FMODE_READ) { | |
1202 | poll_wait_set_exclusive(wait); | |
1203 | poll_wait(filp, &stream->read_wait, wait); | |
1204 | ||
1205 | finalized = stream->finalized; | |
1206 | ||
1207 | /* | |
1208 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1209 | * ordering finalized load before offsets loads. | |
1210 | */ | |
1211 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1212 | ||
1213 | if (finalized) | |
1214 | mask |= POLLHUP; | |
1215 | ||
92d9f5e6 | 1216 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1217 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1218 | stream->metadata_out) |
d83004aa | 1219 | mask |= POLLIN; |
92d9f5e6 | 1220 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1221 | } |
1222 | ||
1223 | return mask; | |
1224 | } | |
1225 | ||
f613e3e6 MD |
1226 | static |
1227 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1228 | unsigned int cmd, unsigned long arg) | |
1229 | { | |
1230 | struct lttng_metadata_stream *stream = filp->private_data; | |
1231 | ||
1232 | stream->metadata_out = stream->metadata_in; | |
1233 | } | |
1234 | ||
d1344afa JD |
1235 | /* |
1236 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1237 | * the consumer receives the content of the metadata cache unchanged. This is | |
1238 | * different from the metadata_regenerate where the offset from epoch is | |
1239 | * resampled, here we want the exact same content as the last time the metadata | |
1240 | * was generated. This command is only possible if all the metadata written | |
1241 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1242 | * metadata file. | |
1243 | * | |
1244 | * Return 0 on success, a negative value on error. | |
1245 | */ | |
1246 | static | |
1247 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1248 | { | |
1249 | int ret; | |
1250 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1251 | ||
1252 | mutex_lock(&cache->lock); | |
1253 | if (stream->metadata_out != cache->metadata_written) { | |
1254 | ret = -EBUSY; | |
1255 | goto end; | |
1256 | } | |
1257 | stream->metadata_out = 0; | |
1258 | stream->metadata_in = 0; | |
1259 | wake_up_interruptible(&stream->read_wait); | |
1260 | ret = 0; | |
1261 | ||
1262 | end: | |
1263 | mutex_unlock(&cache->lock); | |
1264 | return ret; | |
1265 | } | |
1266 | ||
d83004aa JD |
1267 | static |
1268 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1269 | unsigned int cmd, unsigned long arg) | |
1270 | { | |
1271 | int ret; | |
1272 | struct lttng_metadata_stream *stream = filp->private_data; | |
1273 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1274 | unsigned int rb_cmd; |
1275 | bool coherent; | |
1276 | ||
606828e4 MD |
1277 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1278 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1279 | else |
1280 | rb_cmd = cmd; | |
d83004aa JD |
1281 | |
1282 | switch (cmd) { | |
606828e4 | 1283 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1284 | { |
35097f36 JD |
1285 | struct lttng_metadata_stream *stream = filp->private_data; |
1286 | struct lib_ring_buffer *buf = stream->priv; | |
1287 | struct channel *chan = buf->backend.chan; | |
1288 | ||
8b97fd42 | 1289 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1290 | if (ret > 0) { |
1291 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1292 | ret = 0; | |
1293 | } else if (ret < 0) | |
d83004aa JD |
1294 | goto err; |
1295 | break; | |
1296 | } | |
606828e4 | 1297 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1298 | { |
1299 | /* | |
1300 | * Random access is not allowed for metadata channel. | |
1301 | */ | |
1302 | return -ENOSYS; | |
1303 | } | |
606828e4 MD |
1304 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
1305 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: | |
35097f36 JD |
1306 | { |
1307 | struct lttng_metadata_stream *stream = filp->private_data; | |
1308 | struct lib_ring_buffer *buf = stream->priv; | |
1309 | struct channel *chan = buf->backend.chan; | |
1310 | ||
1311 | /* | |
1312 | * Before doing the actual ring buffer flush, write up to one | |
1313 | * packet of metadata in the ring buffer. | |
1314 | */ | |
8b97fd42 | 1315 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1316 | if (ret < 0) |
1317 | goto err; | |
1318 | break; | |
1319 | } | |
606828e4 | 1320 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
9616f0bf JD |
1321 | { |
1322 | struct lttng_metadata_stream *stream = filp->private_data; | |
1323 | ||
1324 | return put_u64(stream->version, arg); | |
1325 | } | |
606828e4 | 1326 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1327 | { |
1328 | struct lttng_metadata_stream *stream = filp->private_data; | |
1329 | ||
1330 | return lttng_metadata_cache_dump(stream); | |
1331 | } | |
606828e4 | 1332 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1333 | { |
1334 | struct lttng_metadata_stream *stream = filp->private_data; | |
1335 | struct lib_ring_buffer *buf = stream->priv; | |
1336 | struct channel *chan = buf->backend.chan; | |
1337 | ||
1338 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1339 | if (ret > 0) { | |
1340 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1341 | ret = 0; | |
1342 | } else if (ret < 0) { | |
1343 | goto err; | |
1344 | } | |
1345 | break; | |
1346 | } | |
d83004aa JD |
1347 | default: |
1348 | break; | |
1349 | } | |
f613e3e6 MD |
1350 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1351 | ||
d83004aa | 1352 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1353 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1354 | if (ret < 0) |
1355 | goto err; | |
d83004aa | 1356 | |
f613e3e6 | 1357 | switch (cmd) { |
606828e4 | 1358 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1359 | { |
1360 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1361 | cmd, arg); | |
1362 | break; | |
1363 | } | |
606828e4 | 1364 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1365 | { |
1366 | return put_u32(coherent, arg); | |
1367 | } | |
f613e3e6 MD |
1368 | default: |
1369 | break; | |
1370 | } | |
d83004aa JD |
1371 | err: |
1372 | return ret; | |
1373 | } | |
1374 | ||
aeb9064d | 1375 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1376 | static |
1377 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1378 | unsigned int cmd, unsigned long arg) | |
1379 | { | |
1380 | int ret; | |
1381 | struct lttng_metadata_stream *stream = filp->private_data; | |
1382 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1383 | unsigned int rb_cmd; |
1384 | bool coherent; | |
1385 | ||
606828e4 MD |
1386 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1387 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1388 | else |
1389 | rb_cmd = cmd; | |
d83004aa JD |
1390 | |
1391 | switch (cmd) { | |
606828e4 | 1392 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1393 | { |
35097f36 JD |
1394 | struct lttng_metadata_stream *stream = filp->private_data; |
1395 | struct lib_ring_buffer *buf = stream->priv; | |
1396 | struct channel *chan = buf->backend.chan; | |
1397 | ||
8b97fd42 | 1398 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1399 | if (ret > 0) { |
1400 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1401 | ret = 0; | |
1402 | } else if (ret < 0) | |
d83004aa JD |
1403 | goto err; |
1404 | break; | |
1405 | } | |
606828e4 | 1406 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1407 | { |
1408 | /* | |
1409 | * Random access is not allowed for metadata channel. | |
1410 | */ | |
1411 | return -ENOSYS; | |
1412 | } | |
606828e4 MD |
1413 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
1414 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: | |
96c55c2f MD |
1415 | { |
1416 | struct lttng_metadata_stream *stream = filp->private_data; | |
1417 | struct lib_ring_buffer *buf = stream->priv; | |
1418 | struct channel *chan = buf->backend.chan; | |
1419 | ||
1420 | /* | |
1421 | * Before doing the actual ring buffer flush, write up to one | |
1422 | * packet of metadata in the ring buffer. | |
1423 | */ | |
8b97fd42 | 1424 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1425 | if (ret < 0) |
1426 | goto err; | |
1427 | break; | |
1428 | } | |
606828e4 | 1429 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
96c55c2f MD |
1430 | { |
1431 | struct lttng_metadata_stream *stream = filp->private_data; | |
1432 | ||
1433 | return put_u64(stream->version, arg); | |
1434 | } | |
606828e4 | 1435 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1436 | { |
1437 | struct lttng_metadata_stream *stream = filp->private_data; | |
1438 | ||
1439 | return lttng_metadata_cache_dump(stream); | |
1440 | } | |
606828e4 | 1441 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1442 | { |
1443 | struct lttng_metadata_stream *stream = filp->private_data; | |
1444 | struct lib_ring_buffer *buf = stream->priv; | |
1445 | struct channel *chan = buf->backend.chan; | |
1446 | ||
1447 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1448 | if (ret > 0) { | |
1449 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1450 | ret = 0; | |
1451 | } else if (ret < 0) { | |
1452 | goto err; | |
1453 | } | |
1454 | break; | |
1455 | } | |
d83004aa JD |
1456 | default: |
1457 | break; | |
1458 | } | |
f613e3e6 MD |
1459 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1460 | ||
d83004aa | 1461 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1462 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1463 | if (ret < 0) |
1464 | goto err; | |
d83004aa | 1465 | |
f613e3e6 | 1466 | switch (cmd) { |
606828e4 | 1467 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1468 | { |
1469 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1470 | cmd, arg); | |
1471 | break; | |
1472 | } | |
606828e4 | 1473 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1474 | { |
1475 | return put_u32(coherent, arg); | |
1476 | } | |
f613e3e6 MD |
1477 | default: |
1478 | break; | |
1479 | } | |
d83004aa JD |
1480 | err: |
1481 | return ret; | |
1482 | } | |
aeb9064d | 1483 | #endif |
d83004aa | 1484 | |
b3b8072b MD |
1485 | /* |
1486 | * This is not used by anonymous file descriptors. This code is left | |
1487 | * there if we ever want to implement an inode with open() operation. | |
1488 | */ | |
d83004aa JD |
1489 | static |
1490 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1491 | { | |
1492 | struct lttng_metadata_stream *stream = inode->i_private; | |
1493 | struct lib_ring_buffer *buf = stream->priv; | |
1494 | ||
1495 | file->private_data = buf; | |
b3b8072b MD |
1496 | /* |
1497 | * Since life-time of metadata cache differs from that of | |
1498 | * session, we need to keep our own reference on the transport. | |
1499 | */ | |
1500 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1501 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1502 | return -EBUSY; |
1503 | } | |
d83004aa JD |
1504 | return lib_ring_buffer_open(inode, file, buf); |
1505 | } | |
1506 | ||
1507 | static | |
1508 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1509 | { | |
1510 | struct lttng_metadata_stream *stream = file->private_data; | |
1511 | struct lib_ring_buffer *buf = stream->priv; | |
1512 | ||
92143b2c MD |
1513 | mutex_lock(&stream->metadata_cache->lock); |
1514 | list_del(&stream->list); | |
1515 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1516 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1517 | module_put(stream->transport->owner); |
92143b2c | 1518 | kfree(stream); |
d83004aa JD |
1519 | return lib_ring_buffer_release(inode, file, buf); |
1520 | } | |
1521 | ||
1522 | static | |
1523 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1524 | struct pipe_inode_info *pipe, size_t len, | |
1525 | unsigned int flags) | |
1526 | { | |
1527 | struct lttng_metadata_stream *stream = in->private_data; | |
1528 | struct lib_ring_buffer *buf = stream->priv; | |
1529 | ||
1530 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1531 | flags, buf); | |
1532 | } | |
1533 | ||
1534 | static | |
1535 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1536 | struct vm_area_struct *vma) | |
1537 | { | |
1538 | struct lttng_metadata_stream *stream = filp->private_data; | |
1539 | struct lib_ring_buffer *buf = stream->priv; | |
1540 | ||
1541 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1542 | } | |
1543 | ||
1544 | static | |
1545 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1546 | .owner = THIS_MODULE, | |
1547 | .open = lttng_metadata_ring_buffer_open, | |
1548 | .release = lttng_metadata_ring_buffer_release, | |
1549 | .poll = lttng_metadata_ring_buffer_poll, | |
1550 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1551 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1552 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1553 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1554 | #ifdef CONFIG_COMPAT | |
1555 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1556 | #endif | |
1557 | }; | |
1558 | ||
1559 | static | |
1560 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1561 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1562 | { |
ad1c05e1 | 1563 | int stream_fd, ret; |
11b5a3c2 | 1564 | struct file *stream_file; |
ad1c05e1 | 1565 | |
4ac10b76 | 1566 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1567 | if (stream_fd < 0) { |
1568 | ret = stream_fd; | |
1569 | goto fd_error; | |
1570 | } | |
a3fcd499 | 1571 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1572 | if (IS_ERR(stream_file)) { |
1573 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1574 | goto file_error; |
1575 | } | |
409453cb MD |
1576 | /* |
1577 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1578 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1579 | * file descriptor, so we set FMODE_PREAD here. | |
1580 | */ | |
d7b6f197 | 1581 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1582 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1583 | /* |
1584 | * The stream holds a reference to the channel within the generic ring | |
1585 | * buffer library, so no need to hold a refcount on the channel and | |
1586 | * session files here. | |
1587 | */ | |
ad1c05e1 MD |
1588 | return stream_fd; |
1589 | ||
1590 | file_error: | |
1591 | put_unused_fd(stream_fd); | |
d83004aa JD |
1592 | fd_error: |
1593 | return ret; | |
1594 | } | |
1595 | ||
1596 | static | |
1597 | int lttng_abi_open_stream(struct file *channel_file) | |
1598 | { | |
1599 | struct lttng_channel *channel = channel_file->private_data; | |
1600 | struct lib_ring_buffer *buf; | |
1601 | int ret; | |
1602 | void *stream_priv; | |
1603 | ||
1604 | buf = channel->ops->buffer_read_open(channel->chan); | |
1605 | if (!buf) | |
1606 | return -ENOENT; | |
1607 | ||
1608 | stream_priv = buf; | |
1609 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1610 | <tng_stream_ring_buffer_file_operations, |
1611 | "[lttng_stream]"); | |
d83004aa JD |
1612 | if (ret < 0) |
1613 | goto fd_error; | |
1614 | ||
1615 | return ret; | |
1616 | ||
1617 | fd_error: | |
1618 | channel->ops->buffer_read_close(buf); | |
1619 | return ret; | |
1620 | } | |
1621 | ||
1622 | static | |
1623 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1624 | { | |
1625 | struct lttng_channel *channel = channel_file->private_data; | |
1626 | struct lttng_session *session = channel->session; | |
1627 | struct lib_ring_buffer *buf; | |
1628 | int ret; | |
1629 | struct lttng_metadata_stream *metadata_stream; | |
1630 | void *stream_priv; | |
1631 | ||
1632 | buf = channel->ops->buffer_read_open(channel->chan); | |
1633 | if (!buf) | |
1634 | return -ENOENT; | |
1635 | ||
1636 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1637 | GFP_KERNEL); | |
b3b8072b MD |
1638 | if (!metadata_stream) { |
1639 | ret = -ENOMEM; | |
1640 | goto nomem; | |
1641 | } | |
d83004aa JD |
1642 | metadata_stream->metadata_cache = session->metadata_cache; |
1643 | init_waitqueue_head(&metadata_stream->read_wait); | |
1644 | metadata_stream->priv = buf; | |
1645 | stream_priv = metadata_stream; | |
b3b8072b | 1646 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
1647 | /* Initial state is an empty metadata, considered as incoherent. */ |
1648 | metadata_stream->coherent = false; | |
b3b8072b MD |
1649 | |
1650 | /* | |
1651 | * Since life-time of metadata cache differs from that of | |
1652 | * session, we need to keep our own reference on the transport. | |
1653 | */ | |
1654 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1655 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1656 | ret = -EINVAL; |
1657 | goto notransport; | |
1658 | } | |
1659 | ||
901aaa5f FD |
1660 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1661 | ret = -EOVERFLOW; | |
9c1f4643 | 1662 | goto kref_error; |
901aaa5f FD |
1663 | } |
1664 | ||
d83004aa | 1665 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1666 | <tng_metadata_ring_buffer_file_operations, |
1667 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1668 | if (ret < 0) |
1669 | goto fd_error; | |
1670 | ||
92143b2c | 1671 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1672 | list_add(&metadata_stream->list, |
1673 | &session->metadata_cache->metadata_stream); | |
92143b2c | 1674 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1675 | return ret; |
1676 | ||
ad1c05e1 | 1677 | fd_error: |
9c1f4643 MD |
1678 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1679 | kref_error: | |
b3b8072b MD |
1680 | module_put(metadata_stream->transport->owner); |
1681 | notransport: | |
1682 | kfree(metadata_stream); | |
1683 | nomem: | |
11b5a3c2 | 1684 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1685 | return ret; |
1686 | } | |
1687 | ||
21f58fb7 FD |
1688 | static |
1689 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1690 | { | |
1691 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
1692 | struct channel *chan = event_notifier_group->chan; | |
1693 | struct lib_ring_buffer *buf; | |
1694 | int ret; | |
1695 | void *stream_priv; | |
1696 | ||
1697 | buf = event_notifier_group->ops->buffer_read_open(chan); | |
1698 | if (!buf) | |
1699 | return -ENOENT; | |
1700 | ||
1701 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1702 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1703 | ret = -EOVERFLOW; | |
1704 | goto refcount_error; | |
1705 | } | |
1706 | event_notifier_group->buf = buf; | |
1707 | stream_priv = event_notifier_group; | |
1708 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1709 | <tng_event_notifier_group_notif_fops, | |
1710 | "[lttng_event_notifier_stream]"); | |
1711 | if (ret < 0) | |
1712 | goto fd_error; | |
1713 | ||
1714 | return ret; | |
1715 | ||
1716 | fd_error: | |
1717 | atomic_long_dec(¬if_file->f_count); | |
1718 | refcount_error: | |
1719 | event_notifier_group->ops->buffer_read_close(buf); | |
1720 | return ret; | |
1721 | } | |
1722 | ||
badfe9f5 | 1723 | static |
606828e4 | 1724 | int lttng_abi_validate_event_param(struct lttng_kernel_abi_event *event_param) |
badfe9f5 MD |
1725 | { |
1726 | /* Limit ABI to implemented features. */ | |
1727 | switch (event_param->instrumentation) { | |
606828e4 | 1728 | case LTTNG_KERNEL_ABI_SYSCALL: |
badfe9f5 | 1729 | switch (event_param->u.syscall.entryexit) { |
606828e4 MD |
1730 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: /* Fall-through */ |
1731 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: /* Fall-through */ | |
1732 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: | |
badfe9f5 MD |
1733 | break; |
1734 | default: | |
1735 | return -EINVAL; | |
1736 | } | |
1737 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1738 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1739 | break; |
1740 | default: | |
1741 | return -EINVAL; | |
1742 | } | |
1743 | switch (event_param->u.syscall.match) { | |
606828e4 | 1744 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
badfe9f5 MD |
1745 | break; |
1746 | default: | |
1747 | return -EINVAL; | |
1748 | } | |
1749 | break; | |
1750 | ||
606828e4 | 1751 | case LTTNG_KERNEL_ABI_KRETPROBE: |
88a82b17 | 1752 | switch (event_param->u.kretprobe.entryexit) { |
606828e4 | 1753 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
88a82b17 | 1754 | break; |
606828e4 MD |
1755 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: /* Fall-through */ |
1756 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: /* Fall-through */ | |
88a82b17 MD |
1757 | default: |
1758 | return -EINVAL; | |
1759 | } | |
1760 | break; | |
1761 | ||
606828e4 MD |
1762 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
1763 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ | |
1764 | case LTTNG_KERNEL_ABI_UPROBE: | |
badfe9f5 MD |
1765 | break; |
1766 | ||
606828e4 MD |
1767 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
1768 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
badfe9f5 MD |
1769 | default: |
1770 | return -EINVAL; | |
1771 | } | |
1772 | return 0; | |
1773 | } | |
1774 | ||
653fe716 | 1775 | static |
c0e31d2e | 1776 | int lttng_abi_create_event(struct file *channel_file, |
606828e4 | 1777 | struct lttng_kernel_abi_event *event_param) |
653fe716 | 1778 | { |
ef784b4d | 1779 | const struct file_operations *fops; |
a90917c3 | 1780 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1781 | int event_fd, ret; |
11b5a3c2 | 1782 | struct file *event_file; |
3c997079 | 1783 | void *priv; |
653fe716 | 1784 | |
606828e4 | 1785 | event_param->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
6dccd6c1 | 1786 | switch (event_param->instrumentation) { |
606828e4 MD |
1787 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1788 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
7371f44c | 1789 | break; |
606828e4 MD |
1790 | case LTTNG_KERNEL_ABI_KPROBE: |
1791 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
e0a7a7c4 | 1792 | break; |
606828e4 | 1793 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
1794 | WARN_ON_ONCE(1); |
1795 | /* Not implemented. */ | |
e0a7a7c4 MD |
1796 | break; |
1797 | default: | |
1798 | break; | |
1799 | } | |
ef784b4d MD |
1800 | |
1801 | switch (event_param->instrumentation) { | |
1802 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ | |
1803 | case LTTNG_KERNEL_ABI_SYSCALL: | |
1804 | fops = <tng_event_recorder_enabler_fops; | |
1805 | break; | |
1806 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ | |
1807 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
1808 | case LTTNG_KERNEL_ABI_UPROBE: | |
1809 | fops = <tng_event_recorder_event_fops; | |
1810 | break; | |
1811 | ||
1812 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
1813 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
1814 | default: | |
1815 | return -EINVAL; | |
1816 | } | |
1817 | ||
33a39a3c MD |
1818 | event_fd = lttng_get_unused_fd(); |
1819 | if (event_fd < 0) { | |
1820 | ret = event_fd; | |
1821 | goto fd_error; | |
1822 | } | |
1823 | event_file = anon_inode_getfile("[lttng_event]", | |
ef784b4d | 1824 | fops, NULL, O_RDWR); |
33a39a3c MD |
1825 | if (IS_ERR(event_file)) { |
1826 | ret = PTR_ERR(event_file); | |
1827 | goto file_error; | |
1828 | } | |
9c1f4643 | 1829 | /* The event holds a reference on the channel */ |
98d7281c | 1830 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1831 | ret = -EOVERFLOW; |
9c1f4643 MD |
1832 | goto refcount_error; |
1833 | } | |
badfe9f5 MD |
1834 | ret = lttng_abi_validate_event_param(event_param); |
1835 | if (ret) | |
1836 | goto event_error; | |
684a1e4d MD |
1837 | |
1838 | switch (event_param->instrumentation) { | |
606828e4 MD |
1839 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
1840 | case LTTNG_KERNEL_ABI_SYSCALL: | |
684a1e4d | 1841 | { |
b2bc0bc8 | 1842 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1843 | |
4993071a PP |
1844 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1845 | /* | |
1846 | * If the event name is a star globbing pattern, | |
1847 | * we create the special star globbing enabler. | |
1848 | */ | |
b2bc0bc8 | 1849 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1850 | event_param, channel); |
3c997079 | 1851 | } else { |
b2bc0bc8 | 1852 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1853 | event_param, channel); |
1ec65de1 | 1854 | } |
b2bc0bc8 | 1855 | priv = event_enabler; |
684a1e4d MD |
1856 | break; |
1857 | } | |
1858 | ||
ef784b4d | 1859 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
606828e4 MD |
1860 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
1861 | case LTTNG_KERNEL_ABI_UPROBE: | |
684a1e4d | 1862 | { |
33a39a3c | 1863 | struct lttng_event *event; |
4ee2453d | 1864 | |
33a39a3c MD |
1865 | /* |
1866 | * We tolerate no failure path after event creation. It | |
1867 | * will stay invariant for the rest of the session. | |
1868 | */ | |
1869 | event = lttng_event_create(channel, event_param, | |
1870 | NULL, NULL, | |
1871 | event_param->instrumentation); | |
1872 | WARN_ON_ONCE(!event); | |
1873 | if (IS_ERR(event)) { | |
1874 | ret = PTR_ERR(event); | |
1875 | goto event_error; | |
80f87dd2 | 1876 | } |
33a39a3c | 1877 | priv = event; |
684a1e4d MD |
1878 | break; |
1879 | } | |
1880 | ||
ef784b4d | 1881 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
606828e4 | 1882 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ |
684a1e4d MD |
1883 | default: |
1884 | ret = -EINVAL; | |
1885 | goto event_error; | |
03037b98 | 1886 | } |
33a39a3c MD |
1887 | event_file->private_data = priv; |
1888 | fd_install(event_fd, event_file); | |
653fe716 MD |
1889 | return event_fd; |
1890 | ||
03037b98 | 1891 | event_error: |
9c1f4643 MD |
1892 | atomic_long_dec(&channel_file->f_count); |
1893 | refcount_error: | |
c0e31d2e | 1894 | fput(event_file); |
653fe716 MD |
1895 | file_error: |
1896 | put_unused_fd(event_fd); | |
1897 | fd_error: | |
653fe716 MD |
1898 | return ret; |
1899 | } | |
ad1c05e1 | 1900 | |
dffef45d | 1901 | static |
ef784b4d | 1902 | long lttng_event_notifier_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1903 | { |
ef784b4d | 1904 | struct lttng_event_notifier *event_notifier = file->private_data; |
dffef45d FD |
1905 | |
1906 | switch (cmd) { | |
606828e4 | 1907 | case LTTNG_KERNEL_ABI_ENABLE: |
ef784b4d | 1908 | return lttng_event_notifier_enable(event_notifier); |
606828e4 | 1909 | case LTTNG_KERNEL_ABI_DISABLE: |
ef784b4d | 1910 | return lttng_event_notifier_disable(event_notifier); |
606828e4 | 1911 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 1912 | return -EINVAL; |
606828e4 | 1913 | case LTTNG_KERNEL_ABI_CAPTURE: |
ef784b4d | 1914 | return -EINVAL; |
606828e4 | 1915 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
ef784b4d MD |
1916 | return lttng_event_notifier_add_callsite(event_notifier, |
1917 | (struct lttng_kernel_abi_event_callsite __user *) arg); | |
dffef45d FD |
1918 | default: |
1919 | return -ENOIOCTLCMD; | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | static | |
ef784b4d | 1924 | long lttng_event_notifier_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1925 | { |
ef784b4d | 1926 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; |
dffef45d | 1927 | |
ef784b4d MD |
1928 | switch (cmd) { |
1929 | case LTTNG_KERNEL_ABI_ENABLE: | |
1930 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
1931 | case LTTNG_KERNEL_ABI_DISABLE: | |
1932 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
1933 | case LTTNG_KERNEL_ABI_FILTER: | |
1934 | return lttng_event_notifier_enabler_attach_filter_bytecode( | |
1935 | event_notifier_enabler, | |
1936 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); | |
1937 | case LTTNG_KERNEL_ABI_CAPTURE: | |
1938 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
1939 | event_notifier_enabler, | |
1940 | (struct lttng_kernel_abi_capture_bytecode __user *) arg); | |
1941 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
1942 | return -EINVAL; | |
dffef45d | 1943 | default: |
ef784b4d | 1944 | return -ENOIOCTLCMD; |
dffef45d | 1945 | } |
ef784b4d | 1946 | } |
dffef45d | 1947 | |
ef784b4d MD |
1948 | static |
1949 | int lttng_event_notifier_event_release(struct inode *inode, struct file *file) | |
1950 | { | |
1951 | struct lttng_event_notifier *event_notifier = file->private_data; | |
1952 | ||
1953 | if (event_notifier) | |
1954 | fput(event_notifier->group->file); | |
dffef45d FD |
1955 | return 0; |
1956 | } | |
1957 | ||
ef784b4d MD |
1958 | static |
1959 | int lttng_event_notifier_enabler_release(struct inode *inode, struct file *file) | |
1960 | { | |
1961 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; | |
1962 | ||
1963 | if (event_notifier_enabler) | |
1964 | fput(event_notifier_enabler->group->file); | |
1965 | return 0; | |
1966 | } | |
1967 | ||
1968 | static const struct file_operations lttng_event_notifier_event_fops = { | |
1969 | .owner = THIS_MODULE, | |
1970 | .release = lttng_event_notifier_event_release, | |
1971 | .unlocked_ioctl = lttng_event_notifier_event_ioctl, | |
1972 | #ifdef CONFIG_COMPAT | |
1973 | .compat_ioctl = lttng_event_notifier_event_ioctl, | |
1974 | #endif | |
1975 | }; | |
1976 | ||
1977 | static const struct file_operations lttng_event_notifier_enabler_fops = { | |
dffef45d | 1978 | .owner = THIS_MODULE, |
ef784b4d MD |
1979 | .release = lttng_event_notifier_enabler_release, |
1980 | .unlocked_ioctl = lttng_event_notifier_enabler_ioctl, | |
dffef45d | 1981 | #ifdef CONFIG_COMPAT |
ef784b4d | 1982 | .compat_ioctl = lttng_event_notifier_enabler_ioctl, |
dffef45d FD |
1983 | #endif |
1984 | }; | |
1985 | ||
1986 | static | |
1987 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
606828e4 | 1988 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
1989 | { |
1990 | struct lttng_event_notifier_group *event_notifier_group = | |
1991 | event_notifier_group_file->private_data; | |
ef784b4d | 1992 | const struct file_operations *fops; |
dffef45d FD |
1993 | int event_notifier_fd, ret; |
1994 | struct file *event_notifier_file; | |
1995 | void *priv; | |
1996 | ||
1997 | switch (event_notifier_param->event.instrumentation) { | |
606828e4 MD |
1998 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1999 | case LTTNG_KERNEL_ABI_UPROBE: | |
b01155ba | 2000 | break; |
606828e4 MD |
2001 | case LTTNG_KERNEL_ABI_KPROBE: |
2002 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
2b16f0c9 | 2003 | break; |
606828e4 | 2004 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 | 2005 | break; |
606828e4 | 2006 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9de67196 | 2007 | /* Placing an event notifier on kretprobe is not supported. */ |
606828e4 MD |
2008 | case LTTNG_KERNEL_ABI_FUNCTION: |
2009 | case LTTNG_KERNEL_ABI_NOOP: | |
dffef45d FD |
2010 | default: |
2011 | ret = -EINVAL; | |
2012 | goto inval_instr; | |
2013 | } | |
2014 | ||
ef784b4d MD |
2015 | switch (event_notifier_param->event.instrumentation) { |
2016 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ | |
2017 | case LTTNG_KERNEL_ABI_SYSCALL: | |
2018 | fops = <tng_event_notifier_enabler_fops; | |
2019 | break; | |
2020 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ | |
2021 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ | |
2022 | case LTTNG_KERNEL_ABI_UPROBE: | |
2023 | fops = <tng_event_notifier_event_fops; | |
2024 | break; | |
2025 | ||
2026 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ | |
2027 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ | |
2028 | default: | |
2029 | ret = -EINVAL; | |
2030 | goto inval_instr; | |
2031 | } | |
2032 | ||
606828e4 | 2033 | event_notifier_param->event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
dffef45d FD |
2034 | |
2035 | event_notifier_fd = lttng_get_unused_fd(); | |
2036 | if (event_notifier_fd < 0) { | |
2037 | ret = event_notifier_fd; | |
2038 | goto fd_error; | |
2039 | } | |
2040 | ||
2041 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
ef784b4d | 2042 | fops, NULL, O_RDWR); |
dffef45d FD |
2043 | if (IS_ERR(event_notifier_file)) { |
2044 | ret = PTR_ERR(event_notifier_file); | |
2045 | goto file_error; | |
2046 | } | |
2047 | ||
2048 | /* The event notifier holds a reference on the event notifier group. */ | |
2049 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2050 | ret = -EOVERFLOW; | |
2051 | goto refcount_error; | |
2052 | } | |
2053 | ||
56237619 MD |
2054 | ret = lttng_abi_validate_event_param(&event_notifier_param->event); |
2055 | if (ret) | |
2056 | goto event_notifier_error; | |
2057 | ||
684a1e4d | 2058 | switch (event_notifier_param->event.instrumentation) { |
606828e4 MD |
2059 | case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */ |
2060 | case LTTNG_KERNEL_ABI_SYSCALL: | |
684a1e4d | 2061 | { |
dffef45d FD |
2062 | struct lttng_event_notifier_enabler *enabler; |
2063 | ||
2064 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2065 | /* | |
2066 | * If the event name is a star globbing pattern, | |
2067 | * we create the special star globbing enabler. | |
2068 | */ | |
2069 | enabler = lttng_event_notifier_enabler_create( | |
2070 | event_notifier_group, | |
2071 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
2072 | event_notifier_param); | |
2073 | } else { | |
2074 | enabler = lttng_event_notifier_enabler_create( | |
2075 | event_notifier_group, | |
2076 | LTTNG_ENABLER_FORMAT_NAME, | |
2077 | event_notifier_param); | |
2078 | } | |
2079 | priv = enabler; | |
684a1e4d MD |
2080 | break; |
2081 | } | |
2082 | ||
ef784b4d | 2083 | case LTTNG_KERNEL_ABI_KPROBE: /* Fall-through */ |
606828e4 MD |
2084 | case LTTNG_KERNEL_ABI_KRETPROBE: /* Fall-through */ |
2085 | case LTTNG_KERNEL_ABI_UPROBE: | |
684a1e4d | 2086 | { |
dffef45d FD |
2087 | struct lttng_event_notifier *event_notifier; |
2088 | ||
2089 | /* | |
2090 | * We tolerate no failure path after event notifier creation. | |
2091 | * It will stay invariant for the rest of the session. | |
2092 | */ | |
2093 | event_notifier = lttng_event_notifier_create(NULL, | |
99f52fcc FD |
2094 | event_notifier_param->event.token, |
2095 | event_notifier_param->error_counter_index, | |
2096 | event_notifier_group, | |
dffef45d FD |
2097 | event_notifier_param, NULL, |
2098 | event_notifier_param->event.instrumentation); | |
2099 | WARN_ON_ONCE(!event_notifier); | |
2100 | if (IS_ERR(event_notifier)) { | |
2101 | ret = PTR_ERR(event_notifier); | |
2102 | goto event_notifier_error; | |
2103 | } | |
2104 | priv = event_notifier; | |
684a1e4d MD |
2105 | break; |
2106 | } | |
2107 | ||
ef784b4d | 2108 | case LTTNG_KERNEL_ABI_FUNCTION: /* Fall-through */ |
606828e4 | 2109 | case LTTNG_KERNEL_ABI_NOOP: /* Fall-through */ |
684a1e4d MD |
2110 | default: |
2111 | ret = -EINVAL; | |
2112 | goto event_notifier_error; | |
dffef45d FD |
2113 | } |
2114 | event_notifier_file->private_data = priv; | |
2115 | fd_install(event_notifier_fd, event_notifier_file); | |
2116 | return event_notifier_fd; | |
2117 | ||
2118 | event_notifier_error: | |
2119 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2120 | refcount_error: | |
2121 | fput(event_notifier_file); | |
2122 | file_error: | |
2123 | put_unused_fd(event_notifier_fd); | |
2124 | fd_error: | |
2125 | inval_instr: | |
2126 | return ret; | |
2127 | } | |
2128 | ||
99f52fcc FD |
2129 | static |
2130 | long lttng_abi_event_notifier_group_create_error_counter( | |
2131 | struct file *event_notifier_group_file, | |
606828e4 | 2132 | const struct lttng_kernel_abi_counter_conf *error_counter_conf) |
99f52fcc FD |
2133 | { |
2134 | int counter_fd, ret; | |
2135 | char *counter_transport_name; | |
2136 | size_t counter_len; | |
2137 | struct lttng_counter *counter = NULL; | |
2138 | struct file *counter_file; | |
2139 | struct lttng_event_notifier_group *event_notifier_group = | |
2140 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2141 | ||
606828e4 | 2142 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR) { |
99f52fcc FD |
2143 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); |
2144 | return -EINVAL; | |
2145 | } | |
2146 | ||
2147 | if (error_counter_conf->number_dimensions != 1) { | |
2148 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2149 | return -EINVAL; | |
2150 | } | |
2151 | ||
2152 | switch (error_counter_conf->bitness) { | |
606828e4 | 2153 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64: |
99f52fcc FD |
2154 | counter_transport_name = "counter-per-cpu-64-modular"; |
2155 | break; | |
606828e4 | 2156 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32: |
99f52fcc FD |
2157 | counter_transport_name = "counter-per-cpu-32-modular"; |
2158 | break; | |
2159 | default: | |
2160 | return -EINVAL; | |
2161 | } | |
2162 | ||
2163 | /* | |
2164 | * Lock sessions to provide mutual exclusion against concurrent | |
2165 | * modification of event_notifier group, which would result in | |
2166 | * overwriting the error counter if set concurrently. | |
2167 | */ | |
2168 | lttng_lock_sessions(); | |
2169 | ||
2170 | if (event_notifier_group->error_counter) { | |
2171 | printk(KERN_ERR "Error counter already created in event_notifier group\n"); | |
2172 | ret = -EBUSY; | |
2173 | goto fd_error; | |
2174 | } | |
2175 | ||
2176 | counter_fd = lttng_get_unused_fd(); | |
2177 | if (counter_fd < 0) { | |
2178 | ret = counter_fd; | |
2179 | goto fd_error; | |
2180 | } | |
2181 | ||
2182 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2183 | <tng_counter_fops, | |
2184 | NULL, O_RDONLY); | |
2185 | if (IS_ERR(counter_file)) { | |
2186 | ret = PTR_ERR(counter_file); | |
2187 | goto file_error; | |
2188 | } | |
2189 | ||
2190 | counter_len = error_counter_conf->dimensions[0].size; | |
2191 | ||
2192 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2193 | ret = -EOVERFLOW; | |
2194 | goto refcount_error; | |
2195 | } | |
2196 | ||
2197 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2198 | 1, &counter_len); | |
2199 | if (!counter) { | |
2200 | ret = -EINVAL; | |
2201 | goto counter_error; | |
2202 | } | |
2203 | ||
99f52fcc | 2204 | event_notifier_group->error_counter_len = counter_len; |
ab04d7b1 MD |
2205 | /* |
2206 | * store-release to publish error counter matches load-acquire | |
2207 | * in record_error. Ensures the counter is created and the | |
2208 | * error_counter_len is set before they are used. | |
2209 | */ | |
6657edec | 2210 | lttng_smp_store_release(&event_notifier_group->error_counter, counter); |
99f52fcc FD |
2211 | |
2212 | counter->file = counter_file; | |
2213 | counter->owner = event_notifier_group->file; | |
2214 | counter_file->private_data = counter; | |
2215 | /* Ownership transferred. */ | |
2216 | counter = NULL; | |
2217 | ||
2218 | fd_install(counter_fd, counter_file); | |
2219 | lttng_unlock_sessions(); | |
2220 | ||
2221 | return counter_fd; | |
2222 | ||
2223 | counter_error: | |
2224 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2225 | refcount_error: | |
2226 | fput(counter_file); | |
2227 | file_error: | |
2228 | put_unused_fd(counter_fd); | |
2229 | fd_error: | |
2230 | lttng_unlock_sessions(); | |
2231 | return ret; | |
2232 | } | |
2233 | ||
750b05f2 FD |
2234 | static |
2235 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2236 | unsigned long arg) | |
2237 | { | |
2238 | switch (cmd) { | |
606828e4 | 2239 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
21f58fb7 FD |
2240 | { |
2241 | return lttng_abi_open_event_notifier_group_stream(file); | |
2242 | } | |
606828e4 | 2243 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE: |
dffef45d | 2244 | { |
606828e4 | 2245 | struct lttng_kernel_abi_event_notifier uevent_notifier_param; |
dffef45d FD |
2246 | |
2247 | if (copy_from_user(&uevent_notifier_param, | |
606828e4 | 2248 | (struct lttng_kernel_abi_event_notifier __user *) arg, |
dffef45d FD |
2249 | sizeof(uevent_notifier_param))) |
2250 | return -EFAULT; | |
2251 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2252 | } | |
606828e4 | 2253 | case LTTNG_KERNEL_ABI_COUNTER: |
99f52fcc | 2254 | { |
606828e4 | 2255 | struct lttng_kernel_abi_counter_conf uerror_counter_conf; |
99f52fcc FD |
2256 | |
2257 | if (copy_from_user(&uerror_counter_conf, | |
606828e4 | 2258 | (struct lttng_kernel_abi_counter_conf __user *) arg, |
99f52fcc FD |
2259 | sizeof(uerror_counter_conf))) |
2260 | return -EFAULT; | |
2261 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2262 | &uerror_counter_conf); | |
2263 | } | |
750b05f2 FD |
2264 | default: |
2265 | return -ENOIOCTLCMD; | |
2266 | } | |
2267 | return 0; | |
2268 | } | |
2269 | ||
2270 | static | |
2271 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2272 | { | |
2273 | struct lttng_event_notifier_group *event_notifier_group = | |
2274 | file->private_data; | |
2275 | ||
2276 | if (event_notifier_group) | |
2277 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2278 | return 0; | |
2279 | } | |
2280 | ||
2281 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2282 | .owner = THIS_MODULE, | |
2283 | .release = lttng_event_notifier_group_release, | |
2284 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2285 | #ifdef CONFIG_COMPAT | |
2286 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2287 | #endif | |
2288 | }; | |
2289 | ||
ad1c05e1 MD |
2290 | /** |
2291 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2292 | * | |
c0e31d2e | 2293 | * @file: the file |
ad1c05e1 MD |
2294 | * @cmd: the command |
2295 | * @arg: command arg | |
2296 | * | |
2297 | * This ioctl implements lttng commands: | |
606828e4 | 2298 | * LTTNG_KERNEL_ABI_STREAM |
ad1c05e1 MD |
2299 | * Returns an event stream file descriptor or failure. |
2300 | * (typically, one event stream records events from one CPU) | |
606828e4 | 2301 | * LTTNG_KERNEL_ABI_EVENT |
ad1c05e1 | 2302 | * Returns an event file descriptor or failure. |
606828e4 | 2303 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2304 | * Prepend a context field to each event in the channel |
606828e4 | 2305 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2306 | * Enable recording for events in this channel (weak enable) |
606828e4 | 2307 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2308 | * Disable recording for events in this channel (strong disable) |
baf20995 | 2309 | * |
baf20995 MD |
2310 | * Channel and event file descriptors also hold a reference on the session. |
2311 | */ | |
ad1c05e1 | 2312 | static |
c0e31d2e | 2313 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2314 | { |
a90917c3 | 2315 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 2316 | |
baf20995 | 2317 | switch (cmd) { |
606828e4 MD |
2318 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2319 | case LTTNG_KERNEL_ABI_STREAM: | |
c0e31d2e | 2320 | return lttng_abi_open_stream(file); |
606828e4 | 2321 | case LTTNG_KERNEL_ABI_OLD_EVENT: |
6dccd6c1 | 2322 | { |
606828e4 MD |
2323 | struct lttng_kernel_abi_event *uevent_param; |
2324 | struct lttng_kernel_abi_old_event *old_uevent_param; | |
6dccd6c1 JD |
2325 | int ret; |
2326 | ||
606828e4 | 2327 | uevent_param = kmalloc(sizeof(struct lttng_kernel_abi_event), |
6dccd6c1 JD |
2328 | GFP_KERNEL); |
2329 | if (!uevent_param) { | |
2330 | ret = -ENOMEM; | |
2331 | goto old_event_end; | |
2332 | } | |
2333 | old_uevent_param = kmalloc( | |
606828e4 | 2334 | sizeof(struct lttng_kernel_abi_old_event), |
6dccd6c1 JD |
2335 | GFP_KERNEL); |
2336 | if (!old_uevent_param) { | |
2337 | ret = -ENOMEM; | |
2338 | goto old_event_error_free_param; | |
2339 | } | |
2340 | if (copy_from_user(old_uevent_param, | |
606828e4 MD |
2341 | (struct lttng_kernel_abi_old_event __user *) arg, |
2342 | sizeof(struct lttng_kernel_abi_old_event))) { | |
6dccd6c1 JD |
2343 | ret = -EFAULT; |
2344 | goto old_event_error_free_old_param; | |
2345 | } | |
2346 | ||
2347 | memcpy(uevent_param->name, old_uevent_param->name, | |
2348 | sizeof(uevent_param->name)); | |
2349 | uevent_param->instrumentation = | |
2350 | old_uevent_param->instrumentation; | |
2351 | ||
2352 | switch (old_uevent_param->instrumentation) { | |
606828e4 | 2353 | case LTTNG_KERNEL_ABI_KPROBE: |
6dccd6c1 JD |
2354 | uevent_param->u.kprobe.addr = |
2355 | old_uevent_param->u.kprobe.addr; | |
2356 | uevent_param->u.kprobe.offset = | |
2357 | old_uevent_param->u.kprobe.offset; | |
2358 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2359 | old_uevent_param->u.kprobe.symbol_name, | |
2360 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2361 | break; | |
606828e4 | 2362 | case LTTNG_KERNEL_ABI_KRETPROBE: |
6dccd6c1 JD |
2363 | uevent_param->u.kretprobe.addr = |
2364 | old_uevent_param->u.kretprobe.addr; | |
2365 | uevent_param->u.kretprobe.offset = | |
2366 | old_uevent_param->u.kretprobe.offset; | |
2367 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2368 | old_uevent_param->u.kretprobe.symbol_name, | |
2369 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2370 | break; | |
606828e4 | 2371 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
2372 | WARN_ON_ONCE(1); |
2373 | /* Not implemented. */ | |
6dccd6c1 JD |
2374 | break; |
2375 | default: | |
2376 | break; | |
2377 | } | |
2378 | ret = lttng_abi_create_event(file, uevent_param); | |
2379 | ||
2380 | old_event_error_free_old_param: | |
2381 | kfree(old_uevent_param); | |
2382 | old_event_error_free_param: | |
2383 | kfree(uevent_param); | |
2384 | old_event_end: | |
2385 | return ret; | |
2386 | } | |
606828e4 | 2387 | case LTTNG_KERNEL_ABI_EVENT: |
6dccd6c1 | 2388 | { |
606828e4 | 2389 | struct lttng_kernel_abi_event uevent_param; |
6dccd6c1 JD |
2390 | |
2391 | if (copy_from_user(&uevent_param, | |
606828e4 | 2392 | (struct lttng_kernel_abi_event __user *) arg, |
6dccd6c1 JD |
2393 | sizeof(uevent_param))) |
2394 | return -EFAULT; | |
2395 | return lttng_abi_create_event(file, &uevent_param); | |
2396 | } | |
606828e4 | 2397 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2398 | { |
606828e4 MD |
2399 | struct lttng_kernel_abi_context *ucontext_param; |
2400 | struct lttng_kernel_abi_old_context *old_ucontext_param; | |
6dccd6c1 JD |
2401 | int ret; |
2402 | ||
606828e4 | 2403 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_context), |
6dccd6c1 JD |
2404 | GFP_KERNEL); |
2405 | if (!ucontext_param) { | |
2406 | ret = -ENOMEM; | |
2407 | goto old_ctx_end; | |
2408 | } | |
606828e4 | 2409 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_old_context), |
6dccd6c1 JD |
2410 | GFP_KERNEL); |
2411 | if (!old_ucontext_param) { | |
2412 | ret = -ENOMEM; | |
2413 | goto old_ctx_error_free_param; | |
2414 | } | |
2415 | ||
2416 | if (copy_from_user(old_ucontext_param, | |
606828e4 MD |
2417 | (struct lttng_kernel_abi_old_context __user *) arg, |
2418 | sizeof(struct lttng_kernel_abi_old_context))) { | |
6dccd6c1 JD |
2419 | ret = -EFAULT; |
2420 | goto old_ctx_error_free_old_param; | |
2421 | } | |
2422 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2423 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2424 | sizeof(ucontext_param->padding)); | |
2425 | /* only type that uses the union */ | |
606828e4 | 2426 | if (old_ucontext_param->ctx == LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER) { |
6dccd6c1 JD |
2427 | ucontext_param->u.perf_counter.type = |
2428 | old_ucontext_param->u.perf_counter.type; | |
2429 | ucontext_param->u.perf_counter.config = | |
2430 | old_ucontext_param->u.perf_counter.config; | |
2431 | memcpy(ucontext_param->u.perf_counter.name, | |
2432 | old_ucontext_param->u.perf_counter.name, | |
2433 | sizeof(ucontext_param->u.perf_counter.name)); | |
2434 | } | |
2435 | ||
2436 | ret = lttng_abi_add_context(file, | |
2437 | ucontext_param, | |
2438 | &channel->ctx, channel->session); | |
2439 | ||
2440 | old_ctx_error_free_old_param: | |
2441 | kfree(old_ucontext_param); | |
2442 | old_ctx_error_free_param: | |
2443 | kfree(ucontext_param); | |
2444 | old_ctx_end: | |
2445 | return ret; | |
2446 | } | |
606828e4 | 2447 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2448 | { |
606828e4 | 2449 | struct lttng_kernel_abi_context ucontext_param; |
6dccd6c1 JD |
2450 | |
2451 | if (copy_from_user(&ucontext_param, | |
606828e4 | 2452 | (struct lttng_kernel_abi_context __user *) arg, |
6dccd6c1 JD |
2453 | sizeof(ucontext_param))) |
2454 | return -EFAULT; | |
2455 | return lttng_abi_add_context(file, | |
2456 | &ucontext_param, | |
8070f5c0 | 2457 | &channel->ctx, channel->session); |
6dccd6c1 | 2458 | } |
606828e4 MD |
2459 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2460 | case LTTNG_KERNEL_ABI_ENABLE: | |
a90917c3 | 2461 | return lttng_channel_enable(channel); |
606828e4 MD |
2462 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2463 | case LTTNG_KERNEL_ABI_DISABLE: | |
a90917c3 | 2464 | return lttng_channel_disable(channel); |
606828e4 | 2465 | case LTTNG_KERNEL_ABI_SYSCALL_MASK: |
12e579db | 2466 | return lttng_channel_syscall_mask(channel, |
606828e4 | 2467 | (struct lttng_kernel_abi_syscall_mask __user *) arg); |
baf20995 MD |
2468 | default: |
2469 | return -ENOIOCTLCMD; | |
2470 | } | |
2471 | } | |
2472 | ||
5dbbdb43 MD |
2473 | /** |
2474 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2475 | * | |
2476 | * @file: the file | |
2477 | * @cmd: the command | |
2478 | * @arg: command arg | |
2479 | * | |
2480 | * This ioctl implements lttng commands: | |
606828e4 | 2481 | * LTTNG_KERNEL_ABI_STREAM |
5dbbdb43 MD |
2482 | * Returns an event stream file descriptor or failure. |
2483 | * | |
2484 | * Channel and event file descriptors also hold a reference on the session. | |
2485 | */ | |
2486 | static | |
2487 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2488 | { | |
2489 | switch (cmd) { | |
606828e4 MD |
2490 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2491 | case LTTNG_KERNEL_ABI_STREAM: | |
d83004aa | 2492 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2493 | default: |
2494 | return -ENOIOCTLCMD; | |
2495 | } | |
2496 | } | |
2497 | ||
653fe716 MD |
2498 | /** |
2499 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2500 | * | |
c0e31d2e | 2501 | * @file: the file |
653fe716 MD |
2502 | * @wait: poll table |
2503 | */ | |
c0e31d2e | 2504 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2505 | { |
a90917c3 | 2506 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2507 | unsigned int mask = 0; |
2508 | ||
c0e31d2e | 2509 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2510 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2511 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2512 | wait); | |
653fe716 | 2513 | |
254ec7bc MD |
2514 | if (channel->ops->is_disabled(channel->chan)) |
2515 | return POLLERR; | |
24cedcfe | 2516 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2517 | return POLLHUP; |
f71ecafa | 2518 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2519 | return POLLIN | POLLRDNORM; |
f71ecafa | 2520 | return 0; |
653fe716 MD |
2521 | } |
2522 | return mask; | |
2523 | ||
2524 | } | |
2525 | ||
0a84a57f MD |
2526 | static |
2527 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2528 | { | |
a90917c3 | 2529 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
2530 | |
2531 | if (channel) | |
2532 | fput(channel->session->file); | |
0a84a57f MD |
2533 | return 0; |
2534 | } | |
2535 | ||
d83004aa JD |
2536 | static |
2537 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2538 | { | |
2539 | struct lttng_channel *channel = file->private_data; | |
2540 | ||
2541 | if (channel) { | |
d83004aa | 2542 | fput(channel->session->file); |
a3381417 | 2543 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2544 | } |
2545 | ||
2546 | return 0; | |
2547 | } | |
2548 | ||
ad1c05e1 | 2549 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2550 | .owner = THIS_MODULE, |
03037b98 | 2551 | .release = lttng_channel_release, |
653fe716 | 2552 | .poll = lttng_channel_poll, |
ad1c05e1 | 2553 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2554 | #ifdef CONFIG_COMPAT |
03037b98 | 2555 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2556 | #endif |
11b5a3c2 | 2557 | }; |
baf20995 | 2558 | |
5dbbdb43 | 2559 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2560 | .owner = THIS_MODULE, |
d83004aa | 2561 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2562 | .unlocked_ioctl = lttng_metadata_ioctl, |
2563 | #ifdef CONFIG_COMPAT | |
2564 | .compat_ioctl = lttng_metadata_ioctl, | |
2565 | #endif | |
2566 | }; | |
2567 | ||
8070f5c0 | 2568 | /** |
ef784b4d | 2569 | * lttng_event_recorder_event_ioctl - lttng syscall through ioctl |
8070f5c0 MD |
2570 | * |
2571 | * @file: the file | |
2572 | * @cmd: the command | |
2573 | * @arg: command arg | |
2574 | * | |
2575 | * This ioctl implements lttng commands: | |
606828e4 | 2576 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2577 | * Prepend a context field to each record of this event |
606828e4 | 2578 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2579 | * Enable recording for this event (weak enable) |
606828e4 | 2580 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2581 | * Disable recording for this event (strong disable) |
8070f5c0 MD |
2582 | */ |
2583 | static | |
ef784b4d | 2584 | long lttng_event_recorder_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
8070f5c0 | 2585 | { |
ef784b4d | 2586 | struct lttng_event *event = file->private_data; |
8070f5c0 MD |
2587 | |
2588 | switch (cmd) { | |
606828e4 | 2589 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2590 | { |
3c997079 MD |
2591 | /* Not implemented */ |
2592 | return -ENOSYS; | |
6dccd6c1 | 2593 | } |
606828e4 | 2594 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2595 | { |
3c997079 MD |
2596 | /* Not implemented */ |
2597 | return -ENOSYS; | |
6dccd6c1 | 2598 | } |
606828e4 MD |
2599 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2600 | case LTTNG_KERNEL_ABI_ENABLE: | |
ef784b4d | 2601 | return lttng_event_enable(event); |
606828e4 MD |
2602 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2603 | case LTTNG_KERNEL_ABI_DISABLE: | |
ef784b4d | 2604 | return lttng_event_disable(event); |
606828e4 | 2605 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 2606 | return -EINVAL; |
606828e4 | 2607 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
ef784b4d MD |
2608 | return lttng_event_add_callsite(event, |
2609 | (struct lttng_kernel_abi_event_callsite __user *) arg); | |
8070f5c0 MD |
2610 | default: |
2611 | return -ENOIOCTLCMD; | |
2612 | } | |
2613 | } | |
2614 | ||
ef784b4d MD |
2615 | /** |
2616 | * lttng_event_recorder_enabler_ioctl - lttng syscall through ioctl | |
2617 | * | |
2618 | * @file: the file | |
2619 | * @cmd: the command | |
2620 | * @arg: command arg | |
2621 | * | |
2622 | * This ioctl implements lttng commands: | |
2623 | * LTTNG_KERNEL_ABI_CONTEXT | |
2624 | * Prepend a context field to each record of this event | |
2625 | * LTTNG_KERNEL_ABI_ENABLE | |
2626 | * Enable recording for this event (weak enable) | |
2627 | * LTTNG_KERNEL_ABI_DISABLE | |
2628 | * Disable recording for this event (strong disable) | |
2629 | */ | |
0a84a57f | 2630 | static |
ef784b4d | 2631 | long lttng_event_recorder_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
0a84a57f | 2632 | { |
ef784b4d | 2633 | struct lttng_event_enabler *event_enabler = file->private_data; |
3c997079 | 2634 | |
ef784b4d MD |
2635 | switch (cmd) { |
2636 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: | |
2637 | { | |
2638 | /* Not implemented */ | |
2639 | return -ENOSYS; | |
2640 | } | |
2641 | case LTTNG_KERNEL_ABI_CONTEXT: | |
2642 | { | |
2643 | /* Not implemented */ | |
2644 | return -ENOSYS; | |
2645 | } | |
2646 | case LTTNG_KERNEL_ABI_OLD_ENABLE: | |
2647 | case LTTNG_KERNEL_ABI_ENABLE: | |
2648 | return lttng_event_enabler_enable(event_enabler); | |
2649 | case LTTNG_KERNEL_ABI_OLD_DISABLE: | |
2650 | case LTTNG_KERNEL_ABI_DISABLE: | |
2651 | return lttng_event_enabler_disable(event_enabler); | |
2652 | case LTTNG_KERNEL_ABI_FILTER: | |
2653 | return lttng_event_enabler_attach_filter_bytecode( | |
2654 | event_enabler, | |
2655 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); | |
2656 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
2657 | return -EINVAL; | |
3c997079 | 2658 | default: |
ef784b4d | 2659 | return -ENOIOCTLCMD; |
3c997079 | 2660 | } |
ef784b4d MD |
2661 | } |
2662 | ||
2663 | static | |
2664 | int lttng_event_recorder_event_release(struct inode *inode, struct file *file) | |
2665 | { | |
2666 | struct lttng_event *event = file->private_data; | |
2667 | ||
2668 | if (event) | |
2669 | fput(event->chan->file); | |
2670 | return 0; | |
2671 | } | |
c269fff4 | 2672 | |
ef784b4d MD |
2673 | static |
2674 | int lttng_event_recorder_enabler_release(struct inode *inode, struct file *file) | |
2675 | { | |
2676 | struct lttng_event_enabler *event_enabler = file->private_data; | |
2677 | ||
2678 | if (event_enabler) | |
2679 | fput(event_enabler->chan->file); | |
0a84a57f MD |
2680 | return 0; |
2681 | } | |
2682 | ||
ef784b4d MD |
2683 | static const struct file_operations lttng_event_recorder_event_fops = { |
2684 | .owner = THIS_MODULE, | |
2685 | .release = lttng_event_recorder_event_release, | |
2686 | .unlocked_ioctl = lttng_event_recorder_event_ioctl, | |
2687 | #ifdef CONFIG_COMPAT | |
2688 | .compat_ioctl = lttng_event_recorder_event_ioctl, | |
2689 | #endif | |
2690 | }; | |
2691 | ||
2692 | static const struct file_operations lttng_event_recorder_enabler_fops = { | |
a33c9927 | 2693 | .owner = THIS_MODULE, |
ef784b4d MD |
2694 | .release = lttng_event_recorder_enabler_release, |
2695 | .unlocked_ioctl = lttng_event_recorder_enabler_ioctl, | |
8070f5c0 | 2696 | #ifdef CONFIG_COMPAT |
ef784b4d | 2697 | .compat_ioctl = lttng_event_recorder_enabler_ioctl, |
8070f5c0 | 2698 | #endif |
11b5a3c2 | 2699 | }; |
0a84a57f | 2700 | |
3b731ab1 JD |
2701 | static int put_u64(uint64_t val, unsigned long arg) |
2702 | { | |
2703 | return put_user(val, (uint64_t __user *) arg); | |
2704 | } | |
2705 | ||
8b97fd42 MD |
2706 | static int put_u32(uint32_t val, unsigned long arg) |
2707 | { | |
2708 | return put_user(val, (uint32_t __user *) arg); | |
2709 | } | |
2710 | ||
ed8d02d6 JD |
2711 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2712 | unsigned int cmd, unsigned long arg) | |
2713 | { | |
3b731ab1 JD |
2714 | struct lib_ring_buffer *buf = filp->private_data; |
2715 | struct channel *chan = buf->backend.chan; | |
2716 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2717 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2718 | int ret; |
2719 | ||
2720 | if (atomic_read(&chan->record_disabled)) | |
2721 | return -EIO; | |
2722 | ||
ed8d02d6 | 2723 | switch (cmd) { |
606828e4 | 2724 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2725 | { |
2726 | uint64_t ts; | |
2727 | ||
dd5a0db3 | 2728 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2729 | if (ret < 0) |
2730 | goto error; | |
2731 | return put_u64(ts, arg); | |
2732 | } | |
606828e4 | 2733 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END: |
3b731ab1 JD |
2734 | { |
2735 | uint64_t ts; | |
2736 | ||
dd5a0db3 | 2737 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2738 | if (ret < 0) |
2739 | goto error; | |
2740 | return put_u64(ts, arg); | |
2741 | } | |
606828e4 | 2742 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2743 | { |
2744 | uint64_t ed; | |
2745 | ||
dd5a0db3 | 2746 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2747 | if (ret < 0) |
2748 | goto error; | |
2749 | return put_u64(ed, arg); | |
2750 | } | |
606828e4 | 2751 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE: |
3b731ab1 JD |
2752 | { |
2753 | uint64_t cs; | |
2754 | ||
dd5a0db3 | 2755 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2756 | if (ret < 0) |
2757 | goto error; | |
2758 | return put_u64(cs, arg); | |
2759 | } | |
606828e4 | 2760 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE: |
3b731ab1 JD |
2761 | { |
2762 | uint64_t ps; | |
2763 | ||
dd5a0db3 | 2764 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2765 | if (ret < 0) |
2766 | goto error; | |
2767 | return put_u64(ps, arg); | |
2768 | } | |
606828e4 | 2769 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID: |
3b731ab1 JD |
2770 | { |
2771 | uint64_t si; | |
2772 | ||
dd5a0db3 | 2773 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2774 | if (ret < 0) |
2775 | goto error; | |
2776 | return put_u64(si, arg); | |
2777 | } | |
606828e4 | 2778 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2779 | { |
2780 | uint64_t ts; | |
2781 | ||
dd5a0db3 | 2782 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2783 | if (ret < 0) |
2784 | goto error; | |
2785 | return put_u64(ts, arg); | |
2786 | } | |
606828e4 | 2787 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM: |
5b3cf4f9 JD |
2788 | { |
2789 | uint64_t seq; | |
2790 | ||
2791 | ret = ops->sequence_number(config, buf, &seq); | |
2792 | if (ret < 0) | |
2793 | goto error; | |
2794 | return put_u64(seq, arg); | |
2795 | } | |
606828e4 | 2796 | case LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID: |
5594698f JD |
2797 | { |
2798 | uint64_t id; | |
2799 | ||
2800 | ret = ops->instance_id(config, buf, &id); | |
2801 | if (ret < 0) | |
2802 | goto error; | |
2803 | return put_u64(id, arg); | |
2804 | } | |
3b731ab1 JD |
2805 | default: |
2806 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2807 | cmd, arg); | |
ed8d02d6 | 2808 | } |
3b731ab1 JD |
2809 | |
2810 | error: | |
2811 | return -ENOSYS; | |
ed8d02d6 JD |
2812 | } |
2813 | ||
2814 | #ifdef CONFIG_COMPAT | |
2815 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2816 | unsigned int cmd, unsigned long arg) | |
2817 | { | |
3b731ab1 JD |
2818 | struct lib_ring_buffer *buf = filp->private_data; |
2819 | struct channel *chan = buf->backend.chan; | |
2820 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2821 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2822 | int ret; |
2823 | ||
2824 | if (atomic_read(&chan->record_disabled)) | |
2825 | return -EIO; | |
2826 | ||
ed8d02d6 | 2827 | switch (cmd) { |
606828e4 | 2828 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2829 | { |
2830 | uint64_t ts; | |
2831 | ||
dd5a0db3 | 2832 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2833 | if (ret < 0) |
2834 | goto error; | |
2835 | return put_u64(ts, arg); | |
2836 | } | |
606828e4 | 2837 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: |
3b731ab1 JD |
2838 | { |
2839 | uint64_t ts; | |
2840 | ||
dd5a0db3 | 2841 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2842 | if (ret < 0) |
2843 | goto error; | |
2844 | return put_u64(ts, arg); | |
2845 | } | |
606828e4 | 2846 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2847 | { |
2848 | uint64_t ed; | |
2849 | ||
dd5a0db3 | 2850 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2851 | if (ret < 0) |
2852 | goto error; | |
2853 | return put_u64(ed, arg); | |
ed8d02d6 | 2854 | } |
606828e4 | 2855 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
3b731ab1 JD |
2856 | { |
2857 | uint64_t cs; | |
2858 | ||
dd5a0db3 | 2859 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2860 | if (ret < 0) |
2861 | goto error; | |
2862 | return put_u64(cs, arg); | |
2863 | } | |
606828e4 | 2864 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_PACKET_SIZE: |
3b731ab1 JD |
2865 | { |
2866 | uint64_t ps; | |
2867 | ||
dd5a0db3 | 2868 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2869 | if (ret < 0) |
2870 | goto error; | |
2871 | return put_u64(ps, arg); | |
2872 | } | |
606828e4 | 2873 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_STREAM_ID: |
3b731ab1 JD |
2874 | { |
2875 | uint64_t si; | |
2876 | ||
dd5a0db3 | 2877 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2878 | if (ret < 0) |
2879 | goto error; | |
2880 | return put_u64(si, arg); | |
2881 | } | |
606828e4 | 2882 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2883 | { |
2884 | uint64_t ts; | |
2885 | ||
dd5a0db3 | 2886 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2887 | if (ret < 0) |
2888 | goto error; | |
2889 | return put_u64(ts, arg); | |
2890 | } | |
606828e4 | 2891 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
5b3cf4f9 JD |
2892 | { |
2893 | uint64_t seq; | |
2894 | ||
2895 | ret = ops->sequence_number(config, buf, &seq); | |
2896 | if (ret < 0) | |
2897 | goto error; | |
2898 | return put_u64(seq, arg); | |
2899 | } | |
606828e4 | 2900 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_INSTANCE_ID: |
5594698f JD |
2901 | { |
2902 | uint64_t id; | |
2903 | ||
2904 | ret = ops->instance_id(config, buf, &id); | |
2905 | if (ret < 0) | |
2906 | goto error; | |
2907 | return put_u64(id, arg); | |
2908 | } | |
3b731ab1 JD |
2909 | default: |
2910 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2911 | cmd, arg); | |
2912 | } | |
2913 | ||
2914 | error: | |
2915 | return -ENOSYS; | |
ed8d02d6 JD |
2916 | } |
2917 | #endif /* CONFIG_COMPAT */ | |
2918 | ||
2919 | static void lttng_stream_override_ring_buffer_fops(void) | |
2920 | { | |
2921 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2922 | lttng_stream_ring_buffer_file_operations.open = | |
2923 | lib_ring_buffer_file_operations.open; | |
2924 | lttng_stream_ring_buffer_file_operations.release = | |
2925 | lib_ring_buffer_file_operations.release; | |
2926 | lttng_stream_ring_buffer_file_operations.poll = | |
2927 | lib_ring_buffer_file_operations.poll; | |
2928 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2929 | lib_ring_buffer_file_operations.splice_read; | |
2930 | lttng_stream_ring_buffer_file_operations.mmap = | |
2931 | lib_ring_buffer_file_operations.mmap; | |
2932 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2933 | lttng_stream_ring_buffer_ioctl; | |
2934 | lttng_stream_ring_buffer_file_operations.llseek = | |
2935 | lib_ring_buffer_file_operations.llseek; | |
2936 | #ifdef CONFIG_COMPAT | |
2937 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2938 | lttng_stream_ring_buffer_compat_ioctl; | |
2939 | #endif | |
2940 | } | |
2941 | ||
80996790 | 2942 | int __init lttng_abi_init(void) |
baf20995 MD |
2943 | { |
2944 | int ret = 0; | |
2945 | ||
263b6c88 | 2946 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2947 | lttng_clock_ref(); |
f771eda6 JD |
2948 | |
2949 | ret = lttng_tp_mempool_init(); | |
2950 | if (ret) { | |
2951 | goto error; | |
2952 | } | |
2953 | ||
d29348f7 | 2954 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2955 | <tng_proc_ops, NULL); |
2470a237 | 2956 | |
255e52a4 | 2957 | if (!lttng_proc_dentry) { |
5a15f70c | 2958 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
2959 | ret = -ENOMEM; |
2960 | goto error; | |
2961 | } | |
ed8d02d6 | 2962 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2963 | return 0; |
ed8d02d6 | 2964 | |
baf20995 | 2965 | error: |
f771eda6 | 2966 | lttng_tp_mempool_destroy(); |
2754583e | 2967 | lttng_clock_unref(); |
baf20995 MD |
2968 | return ret; |
2969 | } | |
2970 | ||
e6e65fcd MD |
2971 | /* No __exit annotation because used by init error path too. */ |
2972 | void lttng_abi_exit(void) | |
baf20995 | 2973 | { |
f771eda6 | 2974 | lttng_tp_mempool_destroy(); |
2754583e | 2975 | lttng_clock_unref(); |
e6a17f26 MD |
2976 | if (lttng_proc_dentry) |
2977 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2978 | } |