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> | |
c570be0d | 37 | #include <wrapper/compiler_attributes.h> |
241ae9a8 MD |
38 | #include <wrapper/poll.h> |
39 | #include <wrapper/file.h> | |
40 | #include <wrapper/kref.h> | |
6657edec | 41 | #include <wrapper/barrier.h> |
2df37e95 MD |
42 | #include <lttng/string-utils.h> |
43 | #include <lttng/abi.h> | |
44 | #include <lttng/abi-old.h> | |
45 | #include <lttng/events.h> | |
92bc1e23 | 46 | #include <lttng/events-internal.h> |
2df37e95 MD |
47 | #include <lttng/tracer.h> |
48 | #include <lttng/tp-mempool.h> | |
24591303 | 49 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 50 | #include <ringbuffer/iterator.h> |
baf20995 MD |
51 | |
52 | /* | |
53 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 54 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
55 | */ |
56 | ||
e6a17f26 | 57 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 | 58 | |
5f4c791e | 59 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
60 | static const struct proc_ops lttng_proc_ops; |
61 | #else | |
62 | static const struct file_operations lttng_proc_ops; | |
63 | #endif | |
64 | ||
ad1c05e1 | 65 | static const struct file_operations lttng_session_fops; |
750b05f2 | 66 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 67 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 68 | static const struct file_operations lttng_metadata_fops; |
ef784b4d MD |
69 | static const struct file_operations lttng_event_recorder_event_fops; |
70 | static const struct file_operations lttng_event_recorder_enabler_fops; | |
ed8d02d6 | 71 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 72 | |
9616f0bf | 73 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 74 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 75 | |
99f52fcc FD |
76 | static int validate_zeroed_padding(char *p, size_t len) |
77 | { | |
78 | size_t i; | |
79 | ||
80 | for (i = 0; i < len; i++) { | |
81 | if (p[i]) | |
82 | return -1; | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | ||
a33c9927 MD |
87 | /* |
88 | * Teardown management: opened file descriptors keep a refcount on the module, | |
89 | * so it can only exit when all file descriptors are closed. | |
90 | */ | |
91 | ||
ad1c05e1 | 92 | static |
baf20995 MD |
93 | int lttng_abi_create_session(void) |
94 | { | |
a40e3229 | 95 | struct lttng_kernel_session *session; |
c0e31d2e | 96 | struct file *session_file; |
11b5a3c2 | 97 | int session_fd, ret; |
baf20995 | 98 | |
a90917c3 | 99 | session = lttng_session_create(); |
baf20995 MD |
100 | if (!session) |
101 | return -ENOMEM; | |
4ac10b76 | 102 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
103 | if (session_fd < 0) { |
104 | ret = session_fd; | |
105 | goto fd_error; | |
106 | } | |
c0e31d2e | 107 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 108 | <tng_session_fops, |
baf20995 | 109 | session, O_RDWR); |
c0e31d2e MD |
110 | if (IS_ERR(session_file)) { |
111 | ret = PTR_ERR(session_file); | |
baf20995 MD |
112 | goto file_error; |
113 | } | |
a40e3229 | 114 | session->priv->file = session_file; |
c0e31d2e | 115 | fd_install(session_fd, session_file); |
baf20995 MD |
116 | return session_fd; |
117 | ||
118 | file_error: | |
119 | put_unused_fd(session_fd); | |
120 | fd_error: | |
a90917c3 | 121 | lttng_session_destroy(session); |
baf20995 MD |
122 | return ret; |
123 | } | |
124 | ||
21f58fb7 FD |
125 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
126 | { | |
127 | struct lttng_event_notifier_group *event_notifier_group = | |
128 | container_of(entry, struct lttng_event_notifier_group, | |
129 | wakeup_pending); | |
130 | wake_up_interruptible(&event_notifier_group->read_wait); | |
131 | } | |
132 | ||
750b05f2 FD |
133 | static |
134 | int lttng_abi_create_event_notifier_group(void) | |
135 | { | |
136 | struct lttng_event_notifier_group *event_notifier_group; | |
137 | struct file *event_notifier_group_file; | |
138 | int event_notifier_group_fd, ret; | |
139 | ||
140 | event_notifier_group = lttng_event_notifier_group_create(); | |
141 | if (!event_notifier_group) | |
142 | return -ENOMEM; | |
143 | ||
144 | event_notifier_group_fd = lttng_get_unused_fd(); | |
145 | if (event_notifier_group_fd < 0) { | |
146 | ret = event_notifier_group_fd; | |
147 | goto fd_error; | |
148 | } | |
149 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
150 | <tng_event_notifier_group_fops, | |
151 | event_notifier_group, O_RDWR); | |
152 | if (IS_ERR(event_notifier_group_file)) { | |
153 | ret = PTR_ERR(event_notifier_group_file); | |
154 | goto file_error; | |
155 | } | |
156 | ||
157 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
158 | init_waitqueue_head(&event_notifier_group->read_wait); |
159 | init_irq_work(&event_notifier_group->wakeup_pending, | |
160 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
161 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
162 | return event_notifier_group_fd; | |
163 | ||
164 | file_error: | |
165 | put_unused_fd(event_notifier_group_fd); | |
166 | fd_error: | |
167 | lttng_event_notifier_group_destroy(event_notifier_group); | |
168 | return ret; | |
169 | } | |
170 | ||
271b6681 MD |
171 | static |
172 | int lttng_abi_tracepoint_list(void) | |
173 | { | |
174 | struct file *tracepoint_list_file; | |
175 | int file_fd, ret; | |
176 | ||
4ac10b76 | 177 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
178 | if (file_fd < 0) { |
179 | ret = file_fd; | |
180 | goto fd_error; | |
181 | } | |
30f18bf0 | 182 | |
8ee099b6 | 183 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
184 | <tng_tracepoint_list_fops, |
185 | NULL, O_RDWR); | |
186 | if (IS_ERR(tracepoint_list_file)) { | |
187 | ret = PTR_ERR(tracepoint_list_file); | |
188 | goto file_error; | |
189 | } | |
30f18bf0 MD |
190 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
191 | if (ret < 0) | |
192 | goto open_error; | |
271b6681 MD |
193 | fd_install(file_fd, tracepoint_list_file); |
194 | return file_fd; | |
195 | ||
30f18bf0 MD |
196 | open_error: |
197 | fput(tracepoint_list_file); | |
271b6681 MD |
198 | file_error: |
199 | put_unused_fd(file_fd); | |
200 | fd_error: | |
201 | return ret; | |
202 | } | |
203 | ||
f127e61e MD |
204 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
205 | static inline | |
206 | int lttng_abi_syscall_list(void) | |
207 | { | |
208 | return -ENOSYS; | |
209 | } | |
210 | #else | |
211 | static | |
212 | int lttng_abi_syscall_list(void) | |
213 | { | |
214 | struct file *syscall_list_file; | |
215 | int file_fd, ret; | |
216 | ||
217 | file_fd = lttng_get_unused_fd(); | |
218 | if (file_fd < 0) { | |
219 | ret = file_fd; | |
220 | goto fd_error; | |
221 | } | |
222 | ||
223 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
224 | <tng_syscall_list_fops, | |
225 | NULL, O_RDWR); | |
226 | if (IS_ERR(syscall_list_file)) { | |
227 | ret = PTR_ERR(syscall_list_file); | |
228 | goto file_error; | |
229 | } | |
230 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
231 | if (ret < 0) | |
232 | goto open_error; | |
233 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
234 | return file_fd; |
235 | ||
236 | open_error: | |
237 | fput(syscall_list_file); | |
238 | file_error: | |
239 | put_unused_fd(file_fd); | |
240 | fd_error: | |
241 | return ret; | |
242 | } | |
243 | #endif | |
244 | ||
80c16bcf | 245 | static |
606828e4 | 246 | void lttng_abi_tracer_version(struct lttng_kernel_abi_tracer_version *v) |
80c16bcf | 247 | { |
6dccd6c1 JD |
248 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
249 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
250 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
251 | } |
252 | ||
42cabb80 | 253 | static |
606828e4 | 254 | void lttng_abi_tracer_abi_version(struct lttng_kernel_abi_tracer_abi_version *v) |
42cabb80 | 255 | { |
606828e4 MD |
256 | v->major = LTTNG_KERNEL_ABI_MAJOR_VERSION; |
257 | v->minor = LTTNG_KERNEL_ABI_MINOR_VERSION; | |
42cabb80 MD |
258 | } |
259 | ||
8070f5c0 MD |
260 | static |
261 | long lttng_abi_add_context(struct file *file, | |
606828e4 | 262 | struct lttng_kernel_abi_context *context_param, |
a40e3229 | 263 | struct lttng_kernel_ctx **ctx, struct lttng_kernel_session *session) |
8070f5c0 | 264 | { |
8070f5c0 | 265 | |
a40e3229 | 266 | if (session->priv->been_active) |
8070f5c0 MD |
267 | return -EPERM; |
268 | ||
6dccd6c1 | 269 | switch (context_param->ctx) { |
606828e4 | 270 | case LTTNG_KERNEL_ABI_CONTEXT_PID: |
8070f5c0 | 271 | return lttng_add_pid_to_ctx(ctx); |
606828e4 | 272 | case LTTNG_KERNEL_ABI_CONTEXT_PRIO: |
a8ad3613 | 273 | return lttng_add_prio_to_ctx(ctx); |
606828e4 | 274 | case LTTNG_KERNEL_ABI_CONTEXT_NICE: |
53f1f0ca | 275 | return lttng_add_nice_to_ctx(ctx); |
606828e4 | 276 | case LTTNG_KERNEL_ABI_CONTEXT_VPID: |
b64bc438 | 277 | return lttng_add_vpid_to_ctx(ctx); |
606828e4 | 278 | case LTTNG_KERNEL_ABI_CONTEXT_TID: |
b64bc438 | 279 | return lttng_add_tid_to_ctx(ctx); |
606828e4 | 280 | case LTTNG_KERNEL_ABI_CONTEXT_VTID: |
b64bc438 | 281 | return lttng_add_vtid_to_ctx(ctx); |
606828e4 | 282 | case LTTNG_KERNEL_ABI_CONTEXT_PPID: |
b64bc438 | 283 | return lttng_add_ppid_to_ctx(ctx); |
606828e4 | 284 | case LTTNG_KERNEL_ABI_CONTEXT_VPPID: |
b64bc438 | 285 | return lttng_add_vppid_to_ctx(ctx); |
606828e4 MD |
286 | case LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER: |
287 | context_param->u.perf_counter.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
6dccd6c1 JD |
288 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, |
289 | context_param->u.perf_counter.config, | |
290 | context_param->u.perf_counter.name, | |
c24a0d71 | 291 | ctx); |
606828e4 | 292 | case LTTNG_KERNEL_ABI_CONTEXT_PROCNAME: |
a2563e83 | 293 | return lttng_add_procname_to_ctx(ctx); |
606828e4 | 294 | case LTTNG_KERNEL_ABI_CONTEXT_HOSTNAME: |
975da2c0 | 295 | return lttng_add_hostname_to_ctx(ctx); |
606828e4 | 296 | case LTTNG_KERNEL_ABI_CONTEXT_CPU_ID: |
b3699d90 | 297 | return lttng_add_cpu_id_to_ctx(ctx); |
606828e4 | 298 | case LTTNG_KERNEL_ABI_CONTEXT_INTERRUPTIBLE: |
79150a49 | 299 | return lttng_add_interruptible_to_ctx(ctx); |
606828e4 | 300 | case LTTNG_KERNEL_ABI_CONTEXT_NEED_RESCHEDULE: |
79150a49 | 301 | return lttng_add_need_reschedule_to_ctx(ctx); |
606828e4 | 302 | case LTTNG_KERNEL_ABI_CONTEXT_PREEMPTIBLE: |
79150a49 | 303 | return lttng_add_preemptible_to_ctx(ctx); |
606828e4 | 304 | case LTTNG_KERNEL_ABI_CONTEXT_MIGRATABLE: |
79150a49 | 305 | return lttng_add_migratable_to_ctx(ctx); |
606828e4 MD |
306 | case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_KERNEL: |
307 | case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_USER: | |
2fa2d39a | 308 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); |
606828e4 | 309 | case LTTNG_KERNEL_ABI_CONTEXT_CGROUP_NS: |
a6cf40a4 | 310 | return lttng_add_cgroup_ns_to_ctx(ctx); |
606828e4 | 311 | case LTTNG_KERNEL_ABI_CONTEXT_IPC_NS: |
a6cf40a4 | 312 | return lttng_add_ipc_ns_to_ctx(ctx); |
606828e4 | 313 | case LTTNG_KERNEL_ABI_CONTEXT_MNT_NS: |
a6cf40a4 | 314 | return lttng_add_mnt_ns_to_ctx(ctx); |
606828e4 | 315 | case LTTNG_KERNEL_ABI_CONTEXT_NET_NS: |
a6cf40a4 | 316 | return lttng_add_net_ns_to_ctx(ctx); |
606828e4 | 317 | case LTTNG_KERNEL_ABI_CONTEXT_PID_NS: |
a6cf40a4 | 318 | return lttng_add_pid_ns_to_ctx(ctx); |
606828e4 | 319 | case LTTNG_KERNEL_ABI_CONTEXT_USER_NS: |
a6cf40a4 | 320 | return lttng_add_user_ns_to_ctx(ctx); |
606828e4 | 321 | case LTTNG_KERNEL_ABI_CONTEXT_UTS_NS: |
a6cf40a4 | 322 | return lttng_add_uts_ns_to_ctx(ctx); |
606828e4 | 323 | case LTTNG_KERNEL_ABI_CONTEXT_UID: |
dc923e75 | 324 | return lttng_add_uid_to_ctx(ctx); |
606828e4 | 325 | case LTTNG_KERNEL_ABI_CONTEXT_EUID: |
dc923e75 | 326 | return lttng_add_euid_to_ctx(ctx); |
606828e4 | 327 | case LTTNG_KERNEL_ABI_CONTEXT_SUID: |
dc923e75 | 328 | return lttng_add_suid_to_ctx(ctx); |
606828e4 | 329 | case LTTNG_KERNEL_ABI_CONTEXT_GID: |
dc923e75 | 330 | return lttng_add_gid_to_ctx(ctx); |
606828e4 | 331 | case LTTNG_KERNEL_ABI_CONTEXT_EGID: |
dc923e75 | 332 | return lttng_add_egid_to_ctx(ctx); |
606828e4 | 333 | case LTTNG_KERNEL_ABI_CONTEXT_SGID: |
dc923e75 | 334 | return lttng_add_sgid_to_ctx(ctx); |
606828e4 | 335 | case LTTNG_KERNEL_ABI_CONTEXT_VUID: |
dc923e75 | 336 | return lttng_add_vuid_to_ctx(ctx); |
606828e4 | 337 | case LTTNG_KERNEL_ABI_CONTEXT_VEUID: |
dc923e75 | 338 | return lttng_add_veuid_to_ctx(ctx); |
606828e4 | 339 | case LTTNG_KERNEL_ABI_CONTEXT_VSUID: |
dc923e75 | 340 | return lttng_add_vsuid_to_ctx(ctx); |
606828e4 | 341 | case LTTNG_KERNEL_ABI_CONTEXT_VGID: |
dc923e75 | 342 | return lttng_add_vgid_to_ctx(ctx); |
606828e4 | 343 | case LTTNG_KERNEL_ABI_CONTEXT_VEGID: |
dc923e75 | 344 | return lttng_add_vegid_to_ctx(ctx); |
606828e4 | 345 | case LTTNG_KERNEL_ABI_CONTEXT_VSGID: |
dc923e75 | 346 | return lttng_add_vsgid_to_ctx(ctx); |
606828e4 | 347 | case LTTNG_KERNEL_ABI_CONTEXT_TIME_NS: |
876e2e92 | 348 | return lttng_add_time_ns_to_ctx(ctx); |
8070f5c0 MD |
349 | default: |
350 | return -EINVAL; | |
351 | } | |
352 | } | |
353 | ||
ad1c05e1 MD |
354 | /** |
355 | * lttng_ioctl - lttng syscall through ioctl | |
356 | * | |
c0e31d2e | 357 | * @file: the file |
ad1c05e1 MD |
358 | * @cmd: the command |
359 | * @arg: command arg | |
360 | * | |
361 | * This ioctl implements lttng commands: | |
606828e4 | 362 | * LTTNG_KERNEL_ABI_SESSION |
ad1c05e1 | 363 | * Returns a LTTng trace session file descriptor |
606828e4 | 364 | * LTTNG_KERNEL_ABI_TRACER_VERSION |
271b6681 | 365 | * Returns the LTTng kernel tracer version |
606828e4 | 366 | * LTTNG_KERNEL_ABI_TRACEPOINT_LIST |
271b6681 | 367 | * Returns a file descriptor listing available tracepoints |
606828e4 | 368 | * LTTNG_KERNEL_ABI_WAIT_QUIESCENT |
360f38ea | 369 | * Returns after all previously running probes have completed |
606828e4 | 370 | * LTTNG_KERNEL_ABI_TRACER_ABI_VERSION |
42cabb80 | 371 | * Returns the LTTng kernel tracer ABI version |
606828e4 | 372 | * LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE |
750b05f2 | 373 | * Returns a LTTng event notifier group file descriptor |
ad1c05e1 MD |
374 | * |
375 | * The returned session will be deleted when its file descriptor is closed. | |
376 | */ | |
377 | static | |
c0e31d2e | 378 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
379 | { |
380 | switch (cmd) { | |
606828e4 MD |
381 | case LTTNG_KERNEL_ABI_OLD_SESSION: |
382 | case LTTNG_KERNEL_ABI_SESSION: | |
ad1c05e1 | 383 | return lttng_abi_create_session(); |
606828e4 | 384 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE: |
750b05f2 | 385 | return lttng_abi_create_event_notifier_group(); |
606828e4 | 386 | case LTTNG_KERNEL_ABI_OLD_TRACER_VERSION: |
6dccd6c1 | 387 | { |
606828e4 MD |
388 | struct lttng_kernel_abi_tracer_version v; |
389 | struct lttng_kernel_abi_old_tracer_version oldv; | |
390 | struct lttng_kernel_abi_old_tracer_version *uversion = | |
391 | (struct lttng_kernel_abi_old_tracer_version __user *) arg; | |
6dccd6c1 JD |
392 | |
393 | lttng_abi_tracer_version(&v); | |
394 | oldv.major = v.major; | |
395 | oldv.minor = v.minor; | |
396 | oldv.patchlevel = v.patchlevel; | |
397 | ||
398 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
399 | return -EFAULT; | |
400 | return 0; | |
401 | } | |
606828e4 | 402 | case LTTNG_KERNEL_ABI_TRACER_VERSION: |
6dccd6c1 | 403 | { |
606828e4 MD |
404 | struct lttng_kernel_abi_tracer_version version; |
405 | struct lttng_kernel_abi_tracer_version *uversion = | |
406 | (struct lttng_kernel_abi_tracer_version __user *) arg; | |
6dccd6c1 JD |
407 | |
408 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
409 | |
410 | if (copy_to_user(uversion, &version, sizeof(version))) | |
411 | return -EFAULT; | |
412 | return 0; | |
413 | } | |
606828e4 | 414 | case LTTNG_KERNEL_ABI_TRACER_ABI_VERSION: |
42cabb80 | 415 | { |
606828e4 MD |
416 | struct lttng_kernel_abi_tracer_abi_version version; |
417 | struct lttng_kernel_abi_tracer_abi_version *uversion = | |
418 | (struct lttng_kernel_abi_tracer_abi_version __user *) arg; | |
42cabb80 MD |
419 | |
420 | lttng_abi_tracer_abi_version(&version); | |
421 | ||
6dccd6c1 JD |
422 | if (copy_to_user(uversion, &version, sizeof(version))) |
423 | return -EFAULT; | |
424 | return 0; | |
425 | } | |
606828e4 MD |
426 | case LTTNG_KERNEL_ABI_OLD_TRACEPOINT_LIST: |
427 | case LTTNG_KERNEL_ABI_TRACEPOINT_LIST: | |
271b6681 | 428 | return lttng_abi_tracepoint_list(); |
606828e4 | 429 | case LTTNG_KERNEL_ABI_SYSCALL_LIST: |
2d2464bd | 430 | return lttng_abi_syscall_list(); |
606828e4 MD |
431 | case LTTNG_KERNEL_ABI_OLD_WAIT_QUIESCENT: |
432 | case LTTNG_KERNEL_ABI_WAIT_QUIESCENT: | |
5f7f9078 MD |
433 | synchronize_trace(); |
434 | return 0; | |
606828e4 | 435 | case LTTNG_KERNEL_ABI_OLD_CALIBRATE: |
6dccd6c1 | 436 | { |
606828e4 MD |
437 | struct lttng_kernel_abi_old_calibrate __user *ucalibrate = |
438 | (struct lttng_kernel_abi_old_calibrate __user *) arg; | |
439 | struct lttng_kernel_abi_old_calibrate old_calibrate; | |
440 | struct lttng_kernel_abi_calibrate calibrate; | |
6dccd6c1 JD |
441 | int ret; |
442 | ||
443 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
444 | return -EFAULT; | |
445 | calibrate.type = old_calibrate.type; | |
446 | ret = lttng_calibrate(&calibrate); | |
447 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
448 | return -EFAULT; | |
449 | return ret; | |
450 | } | |
606828e4 | 451 | case LTTNG_KERNEL_ABI_CALIBRATE: |
57105fc2 | 452 | { |
606828e4 MD |
453 | struct lttng_kernel_abi_calibrate __user *ucalibrate = |
454 | (struct lttng_kernel_abi_calibrate __user *) arg; | |
455 | struct lttng_kernel_abi_calibrate calibrate; | |
57105fc2 MD |
456 | int ret; |
457 | ||
458 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
459 | return -EFAULT; | |
460 | ret = lttng_calibrate(&calibrate); | |
461 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
462 | return -EFAULT; | |
463 | return ret; | |
464 | } | |
ad1c05e1 MD |
465 | default: |
466 | return -ENOIOCTLCMD; | |
467 | } | |
468 | } | |
469 | ||
5f4c791e | 470 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
471 | static const struct proc_ops lttng_proc_ops = { |
472 | .proc_ioctl = lttng_ioctl, | |
473 | #ifdef CONFIG_COMPAT | |
474 | .proc_compat_ioctl = lttng_ioctl, | |
475 | #endif /* CONFIG_COMPAT */ | |
476 | }; | |
477 | #else | |
478 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 479 | .owner = THIS_MODULE, |
ad1c05e1 MD |
480 | .unlocked_ioctl = lttng_ioctl, |
481 | #ifdef CONFIG_COMPAT | |
03037b98 | 482 | .compat_ioctl = lttng_ioctl, |
059de147 | 483 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 484 | }; |
059de147 | 485 | #endif |
ad1c05e1 | 486 | |
5dbbdb43 | 487 | static |
c0e31d2e | 488 | int lttng_abi_create_channel(struct file *session_file, |
606828e4 | 489 | struct lttng_kernel_abi_channel *chan_param, |
5dbbdb43 | 490 | enum channel_type channel_type) |
baf20995 | 491 | { |
a40e3229 | 492 | struct lttng_kernel_session *session = session_file->private_data; |
88dfd899 | 493 | const struct file_operations *fops = NULL; |
5dbbdb43 | 494 | const char *transport_name; |
ac847066 | 495 | struct lttng_kernel_channel_buffer *chan; |
c0e31d2e | 496 | struct file *chan_file; |
baf20995 | 497 | int chan_fd; |
ad1c05e1 | 498 | int ret = 0; |
baf20995 | 499 | |
4ac10b76 | 500 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
501 | if (chan_fd < 0) { |
502 | ret = chan_fd; | |
503 | goto fd_error; | |
504 | } | |
88dfd899 MD |
505 | switch (channel_type) { |
506 | case PER_CPU_CHANNEL: | |
507 | fops = <tng_channel_fops; | |
508 | break; | |
509 | case METADATA_CHANNEL: | |
510 | fops = <tng_metadata_fops; | |
511 | break; | |
512 | } | |
2470a237 | 513 | |
c0e31d2e | 514 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 515 | fops, |
03037b98 | 516 | NULL, O_RDWR); |
c0e31d2e MD |
517 | if (IS_ERR(chan_file)) { |
518 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
519 | goto file_error; |
520 | } | |
5dbbdb43 MD |
521 | switch (channel_type) { |
522 | case PER_CPU_CHANNEL: | |
606828e4 | 523 | if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) { |
6dccd6c1 | 524 | transport_name = chan_param->overwrite ? |
96ba7208 | 525 | "relay-overwrite" : "relay-discard"; |
606828e4 | 526 | } else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) { |
6dccd6c1 | 527 | transport_name = chan_param->overwrite ? |
96ba7208 JD |
528 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
529 | } else { | |
530 | return -EINVAL; | |
531 | } | |
5dbbdb43 | 532 | break; |
5dbbdb43 | 533 | case METADATA_CHANNEL: |
606828e4 | 534 | if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) |
96ba7208 | 535 | transport_name = "relay-metadata"; |
606828e4 | 536 | else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) |
96ba7208 JD |
537 | transport_name = "relay-metadata-mmap"; |
538 | else | |
539 | return -EINVAL; | |
5dbbdb43 MD |
540 | break; |
541 | default: | |
542 | transport_name = "<unknown>"; | |
543 | break; | |
544 | } | |
98d7281c MJ |
545 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
546 | ret = -EOVERFLOW; | |
9c1f4643 MD |
547 | goto refcount_error; |
548 | } | |
03037b98 MD |
549 | /* |
550 | * We tolerate no failure path after channel creation. It will stay | |
551 | * invariant for the rest of the session. | |
552 | */ | |
a90917c3 | 553 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
554 | chan_param->subbuf_size, |
555 | chan_param->num_subbuf, | |
556 | chan_param->switch_timer_interval, | |
d83004aa JD |
557 | chan_param->read_timer_interval, |
558 | channel_type); | |
03037b98 | 559 | if (!chan) { |
f3d01b96 | 560 | ret = -EINVAL; |
03037b98 MD |
561 | goto chan_error; |
562 | } | |
ac847066 | 563 | chan->priv->parent.file = chan_file; |
c0e31d2e MD |
564 | chan_file->private_data = chan; |
565 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 566 | |
baf20995 MD |
567 | return chan_fd; |
568 | ||
03037b98 | 569 | chan_error: |
9c1f4643 MD |
570 | atomic_long_dec(&session_file->f_count); |
571 | refcount_error: | |
c0e31d2e | 572 | fput(chan_file); |
baf20995 MD |
573 | file_error: |
574 | put_unused_fd(chan_fd); | |
575 | fd_error: | |
baf20995 MD |
576 | return ret; |
577 | } | |
578 | ||
7f859fbf | 579 | static |
a40e3229 | 580 | int lttng_abi_session_set_name(struct lttng_kernel_session *session, |
606828e4 | 581 | struct lttng_kernel_abi_session_name *name) |
7f859fbf JR |
582 | { |
583 | size_t len; | |
584 | ||
606828e4 | 585 | len = strnlen(name->name, LTTNG_KERNEL_ABI_SESSION_NAME_LEN); |
7f859fbf | 586 | |
606828e4 | 587 | if (len == LTTNG_KERNEL_ABI_SESSION_NAME_LEN) { |
7f859fbf JR |
588 | /* Name is too long/malformed */ |
589 | return -EINVAL; | |
590 | } | |
591 | ||
a40e3229 | 592 | strcpy(session->priv->name, name->name); |
7f859fbf JR |
593 | return 0; |
594 | } | |
595 | ||
1c88f269 | 596 | static |
a40e3229 | 597 | int lttng_abi_session_set_creation_time(struct lttng_kernel_session *session, |
606828e4 | 598 | struct lttng_kernel_abi_session_creation_time *time) |
1c88f269 JR |
599 | { |
600 | size_t len; | |
601 | ||
606828e4 | 602 | len = strnlen(time->iso8601, LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN); |
1c88f269 | 603 | |
606828e4 | 604 | if (len == LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN) { |
1c88f269 JR |
605 | /* Time is too long/malformed */ |
606 | return -EINVAL; | |
607 | } | |
608 | ||
a40e3229 | 609 | strcpy(session->priv->creation_time, time->iso8601); |
1c88f269 JR |
610 | return 0; |
611 | } | |
612 | ||
99f52fcc FD |
613 | static |
614 | int lttng_counter_release(struct inode *inode, struct file *file) | |
615 | { | |
616 | struct lttng_counter *counter = file->private_data; | |
617 | ||
618 | if (counter) { | |
619 | /* | |
620 | * Do not destroy the counter itself. Wait of the owner | |
621 | * (event_notifier group) to be destroyed. | |
622 | */ | |
623 | fput(counter->owner); | |
624 | } | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | static | |
630 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
631 | { | |
632 | struct lttng_counter *counter = file->private_data; | |
606828e4 | 633 | size_t indexes[LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX] = { 0 }; |
99f52fcc FD |
634 | int i; |
635 | ||
636 | switch (cmd) { | |
606828e4 | 637 | case LTTNG_KERNEL_ABI_COUNTER_READ: |
99f52fcc | 638 | { |
606828e4 MD |
639 | struct lttng_kernel_abi_counter_read local_counter_read; |
640 | struct lttng_kernel_abi_counter_read __user *ucounter_read = | |
641 | (struct lttng_kernel_abi_counter_read __user *) arg; | |
99f52fcc FD |
642 | bool overflow, underflow; |
643 | int64_t value; | |
644 | int32_t cpu; | |
645 | int ret; | |
646 | ||
647 | if (copy_from_user(&local_counter_read, ucounter_read, | |
648 | sizeof(local_counter_read))) | |
649 | return -EFAULT; | |
650 | if (validate_zeroed_padding(local_counter_read.padding, | |
651 | sizeof(local_counter_read.padding))) | |
652 | return -EINVAL; | |
7d42b129 MD |
653 | if (local_counter_read.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX) |
654 | return -EINVAL; | |
99f52fcc FD |
655 | |
656 | /* Cast all indexes into size_t. */ | |
657 | for (i = 0; i < local_counter_read.index.number_dimensions; i++) | |
658 | indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i]; | |
659 | cpu = local_counter_read.cpu; | |
660 | ||
661 | ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, | |
662 | &overflow, &underflow); | |
663 | if (ret) | |
664 | return ret; | |
665 | local_counter_read.value.value = value; | |
666 | local_counter_read.value.overflow = overflow; | |
667 | local_counter_read.value.underflow = underflow; | |
668 | ||
669 | if (copy_to_user(&ucounter_read->value, &local_counter_read.value, | |
670 | sizeof(local_counter_read.value))) | |
671 | return -EFAULT; | |
672 | ||
673 | return 0; | |
674 | } | |
606828e4 | 675 | case LTTNG_KERNEL_ABI_COUNTER_AGGREGATE: |
99f52fcc | 676 | { |
606828e4 MD |
677 | struct lttng_kernel_abi_counter_aggregate local_counter_aggregate; |
678 | struct lttng_kernel_abi_counter_aggregate __user *ucounter_aggregate = | |
679 | (struct lttng_kernel_abi_counter_aggregate __user *) arg; | |
99f52fcc FD |
680 | bool overflow, underflow; |
681 | int64_t value; | |
682 | int ret; | |
683 | ||
684 | if (copy_from_user(&local_counter_aggregate, ucounter_aggregate, | |
685 | sizeof(local_counter_aggregate))) | |
686 | return -EFAULT; | |
687 | if (validate_zeroed_padding(local_counter_aggregate.padding, | |
688 | sizeof(local_counter_aggregate.padding))) | |
689 | return -EINVAL; | |
7d42b129 MD |
690 | if (local_counter_aggregate.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX) |
691 | return -EINVAL; | |
99f52fcc FD |
692 | |
693 | /* Cast all indexes into size_t. */ | |
694 | for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++) | |
695 | indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i]; | |
696 | ||
697 | ret = lttng_kernel_counter_aggregate(counter, indexes, &value, | |
698 | &overflow, &underflow); | |
699 | if (ret) | |
700 | return ret; | |
701 | local_counter_aggregate.value.value = value; | |
702 | local_counter_aggregate.value.overflow = overflow; | |
703 | local_counter_aggregate.value.underflow = underflow; | |
704 | ||
705 | if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value, | |
706 | sizeof(local_counter_aggregate.value))) | |
707 | return -EFAULT; | |
708 | ||
709 | return 0; | |
710 | } | |
606828e4 | 711 | case LTTNG_KERNEL_ABI_COUNTER_CLEAR: |
99f52fcc | 712 | { |
606828e4 MD |
713 | struct lttng_kernel_abi_counter_clear local_counter_clear; |
714 | struct lttng_kernel_abi_counter_clear __user *ucounter_clear = | |
715 | (struct lttng_kernel_abi_counter_clear __user *) arg; | |
99f52fcc FD |
716 | |
717 | if (copy_from_user(&local_counter_clear, ucounter_clear, | |
718 | sizeof(local_counter_clear))) | |
719 | return -EFAULT; | |
720 | if (validate_zeroed_padding(local_counter_clear.padding, | |
721 | sizeof(local_counter_clear.padding))) | |
722 | return -EINVAL; | |
7d42b129 MD |
723 | if (local_counter_clear.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX) |
724 | return -EINVAL; | |
99f52fcc FD |
725 | |
726 | /* Cast all indexes into size_t. */ | |
727 | for (i = 0; i < local_counter_clear.index.number_dimensions; i++) | |
728 | indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i]; | |
729 | ||
730 | return lttng_kernel_counter_clear(counter, indexes); | |
731 | } | |
732 | default: | |
99f52fcc FD |
733 | return -ENOSYS; |
734 | } | |
735 | } | |
736 | ||
737 | static const struct file_operations lttng_counter_fops = { | |
738 | .owner = THIS_MODULE, | |
739 | .release = lttng_counter_release, | |
740 | .unlocked_ioctl = lttng_counter_ioctl, | |
741 | #ifdef CONFIG_COMPAT | |
742 | .compat_ioctl = lttng_counter_ioctl, | |
743 | #endif | |
744 | }; | |
745 | ||
746 | ||
d1f652f8 | 747 | static |
606828e4 | 748 | enum tracker_type get_tracker_type(struct lttng_kernel_abi_tracker_args *tracker) |
d1f652f8 MD |
749 | { |
750 | switch (tracker->type) { | |
606828e4 | 751 | case LTTNG_KERNEL_ABI_TRACKER_PID: |
d1f652f8 | 752 | return TRACKER_PID; |
606828e4 | 753 | case LTTNG_KERNEL_ABI_TRACKER_VPID: |
d1f652f8 | 754 | return TRACKER_VPID; |
606828e4 | 755 | case LTTNG_KERNEL_ABI_TRACKER_UID: |
d1f652f8 | 756 | return TRACKER_UID; |
606828e4 | 757 | case LTTNG_KERNEL_ABI_TRACKER_VUID: |
d1f652f8 | 758 | return TRACKER_VUID; |
606828e4 | 759 | case LTTNG_KERNEL_ABI_TRACKER_GID: |
d1f652f8 | 760 | return TRACKER_GID; |
606828e4 | 761 | case LTTNG_KERNEL_ABI_TRACKER_VGID: |
d1f652f8 MD |
762 | return TRACKER_VGID; |
763 | default: | |
764 | return TRACKER_UNKNOWN; | |
765 | } | |
766 | } | |
767 | ||
baf20995 | 768 | /** |
ad1c05e1 | 769 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 770 | * |
c0e31d2e | 771 | * @file: the file |
baf20995 MD |
772 | * @cmd: the command |
773 | * @arg: command arg | |
774 | * | |
775 | * This ioctl implements lttng commands: | |
606828e4 | 776 | * LTTNG_KERNEL_ABI_CHANNEL |
baf20995 | 777 | * Returns a LTTng channel file descriptor |
606828e4 | 778 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 779 | * Enables tracing for a session (weak enable) |
606828e4 | 780 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 781 | * Disables tracing for a session (strong disable) |
606828e4 | 782 | * LTTNG_KERNEL_ABI_METADATA |
8070f5c0 | 783 | * Returns a LTTng metadata file descriptor |
606828e4 | 784 | * LTTNG_KERNEL_ABI_SESSION_TRACK_PID |
d1f652f8 | 785 | * Add PID to session PID tracker |
606828e4 | 786 | * LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID |
d1f652f8 | 787 | * Remove PID from session PID tracker |
606828e4 | 788 | * LTTNG_KERNEL_ABI_SESSION_TRACK_ID |
d1f652f8 | 789 | * Add ID to tracker |
606828e4 | 790 | * LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID |
d1f652f8 | 791 | * Remove ID from tracker |
ad1c05e1 MD |
792 | * |
793 | * The returned channel will be deleted when its file descriptor is closed. | |
794 | */ | |
795 | static | |
c0e31d2e | 796 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 797 | { |
a40e3229 | 798 | struct lttng_kernel_session *session = file->private_data; |
606828e4 MD |
799 | struct lttng_kernel_abi_channel chan_param; |
800 | struct lttng_kernel_abi_old_channel old_chan_param; | |
c0e31d2e | 801 | |
8c71721f MD |
802 | /* |
803 | * Handle backward compatibility. OLD commands have wrong | |
804 | * directions, replace them by the correct direction. | |
805 | */ | |
806 | switch (cmd) { | |
807 | case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_PID: | |
808 | cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_PID; | |
809 | break; | |
810 | case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_PID: | |
811 | cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID; | |
812 | break; | |
813 | case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_ID: | |
814 | cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_ID; | |
815 | break; | |
816 | case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_ID: | |
817 | cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID; | |
818 | break; | |
819 | case LTTNG_KERNEL_ABI_OLD_SESSION_LIST_TRACKER_IDS: | |
820 | cmd = LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS; | |
821 | break; | |
822 | case LTTNG_KERNEL_ABI_OLD_SESSION_SET_NAME: | |
823 | cmd = LTTNG_KERNEL_ABI_SESSION_SET_NAME; | |
824 | break; | |
825 | case LTTNG_KERNEL_ABI_OLD_SESSION_SET_CREATION_TIME: | |
826 | cmd = LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME; | |
827 | break; | |
828 | default: | |
829 | /* Nothing to do. */ | |
830 | break; | |
831 | } | |
832 | ||
ad1c05e1 | 833 | switch (cmd) { |
606828e4 | 834 | case LTTNG_KERNEL_ABI_OLD_CHANNEL: |
6dccd6c1 | 835 | { |
6dccd6c1 | 836 | if (copy_from_user(&old_chan_param, |
606828e4 MD |
837 | (struct lttng_kernel_abi_old_channel __user *) arg, |
838 | sizeof(struct lttng_kernel_abi_old_channel))) | |
6dccd6c1 JD |
839 | return -EFAULT; |
840 | chan_param.overwrite = old_chan_param.overwrite; | |
841 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
842 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
843 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
844 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
845 | chan_param.output = old_chan_param.output; | |
846 | ||
847 | return lttng_abi_create_channel(file, &chan_param, | |
848 | PER_CPU_CHANNEL); | |
849 | } | |
606828e4 | 850 | case LTTNG_KERNEL_ABI_CHANNEL: |
6dccd6c1 | 851 | { |
6dccd6c1 | 852 | if (copy_from_user(&chan_param, |
606828e4 MD |
853 | (struct lttng_kernel_abi_channel __user *) arg, |
854 | sizeof(struct lttng_kernel_abi_channel))) | |
6dccd6c1 JD |
855 | return -EFAULT; |
856 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 857 | PER_CPU_CHANNEL); |
6dccd6c1 | 858 | } |
606828e4 MD |
859 | case LTTNG_KERNEL_ABI_OLD_SESSION_START: |
860 | case LTTNG_KERNEL_ABI_OLD_ENABLE: | |
861 | case LTTNG_KERNEL_ABI_SESSION_START: | |
862 | case LTTNG_KERNEL_ABI_ENABLE: | |
a90917c3 | 863 | return lttng_session_enable(session); |
606828e4 MD |
864 | case LTTNG_KERNEL_ABI_OLD_SESSION_STOP: |
865 | case LTTNG_KERNEL_ABI_OLD_DISABLE: | |
866 | case LTTNG_KERNEL_ABI_SESSION_STOP: | |
867 | case LTTNG_KERNEL_ABI_DISABLE: | |
a90917c3 | 868 | return lttng_session_disable(session); |
606828e4 | 869 | case LTTNG_KERNEL_ABI_OLD_METADATA: |
6dccd6c1 | 870 | { |
6dccd6c1 | 871 | if (copy_from_user(&old_chan_param, |
606828e4 MD |
872 | (struct lttng_kernel_abi_old_channel __user *) arg, |
873 | sizeof(struct lttng_kernel_abi_old_channel))) | |
6dccd6c1 JD |
874 | return -EFAULT; |
875 | chan_param.overwrite = old_chan_param.overwrite; | |
876 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
877 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
878 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
879 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
880 | chan_param.output = old_chan_param.output; | |
881 | ||
882 | return lttng_abi_create_channel(file, &chan_param, | |
883 | METADATA_CHANNEL); | |
884 | } | |
606828e4 | 885 | case LTTNG_KERNEL_ABI_METADATA: |
6dccd6c1 | 886 | { |
6dccd6c1 | 887 | if (copy_from_user(&chan_param, |
606828e4 MD |
888 | (struct lttng_kernel_abi_channel __user *) arg, |
889 | sizeof(struct lttng_kernel_abi_channel))) | |
6dccd6c1 JD |
890 | return -EFAULT; |
891 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 892 | METADATA_CHANNEL); |
6dccd6c1 | 893 | } |
606828e4 | 894 | case LTTNG_KERNEL_ABI_SESSION_TRACK_PID: |
d1f652f8 | 895 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
606828e4 | 896 | case LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID: |
d1f652f8 | 897 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
606828e4 | 898 | case LTTNG_KERNEL_ABI_SESSION_TRACK_ID: |
d1f652f8 | 899 | { |
606828e4 | 900 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
901 | enum tracker_type tracker_type; |
902 | ||
903 | if (copy_from_user(&tracker, | |
606828e4 MD |
904 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
905 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
906 | return -EFAULT; |
907 | tracker_type = get_tracker_type(&tracker); | |
908 | if (tracker_type == TRACKER_UNKNOWN) | |
909 | return -EINVAL; | |
910 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
911 | } | |
606828e4 | 912 | case LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID: |
d1f652f8 | 913 | { |
606828e4 | 914 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
915 | enum tracker_type tracker_type; |
916 | ||
917 | if (copy_from_user(&tracker, | |
606828e4 MD |
918 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
919 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
920 | return -EFAULT; |
921 | tracker_type = get_tracker_type(&tracker); | |
922 | if (tracker_type == TRACKER_UNKNOWN) | |
923 | return -EINVAL; | |
924 | return lttng_session_untrack_id(session, tracker_type, | |
925 | tracker.id); | |
926 | } | |
606828e4 | 927 | case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 | 928 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
606828e4 | 929 | case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS: |
d1f652f8 | 930 | { |
606828e4 | 931 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
932 | enum tracker_type tracker_type; |
933 | ||
934 | if (copy_from_user(&tracker, | |
606828e4 MD |
935 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
936 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
937 | return -EFAULT; |
938 | tracker_type = get_tracker_type(&tracker); | |
939 | if (tracker_type == TRACKER_UNKNOWN) | |
940 | return -EINVAL; | |
941 | return lttng_session_list_tracker_ids(session, tracker_type); | |
942 | } | |
606828e4 | 943 | case LTTNG_KERNEL_ABI_SESSION_METADATA_REGEN: |
9616f0bf | 944 | return lttng_session_metadata_regenerate(session); |
606828e4 | 945 | case LTTNG_KERNEL_ABI_SESSION_STATEDUMP: |
601252cf | 946 | return lttng_session_statedump(session); |
606828e4 | 947 | case LTTNG_KERNEL_ABI_SESSION_SET_NAME: |
7f859fbf | 948 | { |
606828e4 | 949 | struct lttng_kernel_abi_session_name name; |
7f859fbf JR |
950 | |
951 | if (copy_from_user(&name, | |
606828e4 MD |
952 | (struct lttng_kernel_abi_session_name __user *) arg, |
953 | sizeof(struct lttng_kernel_abi_session_name))) | |
7f859fbf JR |
954 | return -EFAULT; |
955 | return lttng_abi_session_set_name(session, &name); | |
956 | } | |
606828e4 | 957 | case LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME: |
1c88f269 | 958 | { |
606828e4 | 959 | struct lttng_kernel_abi_session_creation_time time; |
1c88f269 JR |
960 | |
961 | if (copy_from_user(&time, | |
606828e4 MD |
962 | (struct lttng_kernel_abi_session_creation_time __user *) arg, |
963 | sizeof(struct lttng_kernel_abi_session_creation_time))) | |
1c88f269 JR |
964 | return -EFAULT; |
965 | return lttng_abi_session_set_creation_time(session, &time); | |
966 | } | |
ad1c05e1 MD |
967 | default: |
968 | return -ENOIOCTLCMD; | |
969 | } | |
970 | } | |
971 | ||
03037b98 MD |
972 | /* |
973 | * Called when the last file reference is dropped. | |
974 | * | |
975 | * Big fat note: channels and events are invariant for the whole session after | |
976 | * their creation. So this session destruction also destroys all channel and | |
977 | * event structures specific to this session (they are not destroyed when their | |
978 | * individual file is released). | |
979 | */ | |
ad1c05e1 | 980 | static |
03037b98 | 981 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 982 | { |
a40e3229 | 983 | struct lttng_kernel_session *session = file->private_data; |
c269fff4 MD |
984 | |
985 | if (session) | |
a90917c3 | 986 | lttng_session_destroy(session); |
11b5a3c2 | 987 | return 0; |
ad1c05e1 | 988 | } |
ad1c05e1 MD |
989 | |
990 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 991 | .owner = THIS_MODULE, |
03037b98 | 992 | .release = lttng_session_release, |
ad1c05e1 MD |
993 | .unlocked_ioctl = lttng_session_ioctl, |
994 | #ifdef CONFIG_COMPAT | |
03037b98 | 995 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 996 | #endif |
11b5a3c2 | 997 | }; |
ad1c05e1 | 998 | |
db2511b4 MD |
999 | /* |
1000 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
1001 | * and retry (if new data available to read after flush). | |
1002 | */ | |
1003 | static | |
1004 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
1005 | size_t count, loff_t *ppos) | |
1006 | { | |
1007 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
4071a628 | 1008 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
a2a1b5ab | 1009 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1010 | ssize_t read_count = 0, len; |
1011 | size_t read_offset; | |
1012 | ||
1013 | might_sleep(); | |
1014 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
1015 | return -EFAULT; | |
1016 | ||
1017 | /* Finish copy of previous record */ | |
1018 | if (*ppos != 0) { | |
1019 | if (read_count < count) { | |
1020 | len = chan->iter.len_left; | |
1021 | read_offset = *ppos; | |
1022 | goto skip_get_next; | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | while (read_count < count) { | |
1027 | size_t copy_len, space_left; | |
1028 | ||
1029 | len = lib_ring_buffer_get_next_record(chan, buf); | |
1030 | len_test: | |
1031 | if (len < 0) { | |
1032 | /* | |
1033 | * Check if buffer is finalized (end of file). | |
1034 | */ | |
1035 | if (len == -ENODATA) { | |
1036 | /* A 0 read_count will tell about end of file */ | |
1037 | goto nodata; | |
1038 | } | |
1039 | if (filp->f_flags & O_NONBLOCK) { | |
1040 | if (!read_count) | |
1041 | read_count = -EAGAIN; | |
1042 | goto nodata; | |
1043 | } else { | |
1044 | int error; | |
1045 | ||
1046 | /* | |
1047 | * No data available at the moment, return what | |
1048 | * we got. | |
1049 | */ | |
1050 | if (read_count) | |
1051 | goto nodata; | |
1052 | ||
1053 | /* | |
1054 | * Wait for returned len to be >= 0 or -ENODATA. | |
1055 | */ | |
1056 | error = wait_event_interruptible( | |
1057 | event_notifier_group->read_wait, | |
1058 | ((len = lib_ring_buffer_get_next_record( | |
1059 | chan, buf)), len != -EAGAIN)); | |
1060 | CHAN_WARN_ON(chan, len == -EBUSY); | |
1061 | if (error) { | |
1062 | read_count = error; | |
1063 | goto nodata; | |
1064 | } | |
1065 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
1066 | goto len_test; | |
1067 | } | |
1068 | } | |
1069 | read_offset = buf->iter.read_offset; | |
1070 | skip_get_next: | |
1071 | space_left = count - read_count; | |
1072 | if (len <= space_left) { | |
1073 | copy_len = len; | |
1074 | chan->iter.len_left = 0; | |
1075 | *ppos = 0; | |
1076 | } else { | |
1077 | copy_len = space_left; | |
1078 | chan->iter.len_left = len - copy_len; | |
1079 | *ppos = read_offset + copy_len; | |
1080 | } | |
1081 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
1082 | &user_buf[read_count], | |
1083 | copy_len)) { | |
1084 | /* | |
1085 | * Leave the len_left and ppos values at their current | |
1086 | * state, as we currently have a valid event to read. | |
1087 | */ | |
1088 | return -EFAULT; | |
1089 | } | |
1090 | read_count += copy_len; | |
1091 | } | |
31c02fb7 | 1092 | goto put_record; |
db2511b4 MD |
1093 | |
1094 | nodata: | |
1095 | *ppos = 0; | |
1096 | chan->iter.len_left = 0; | |
31c02fb7 MD |
1097 | |
1098 | put_record: | |
1099 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1100 | return read_count; |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1105 | * there is data available. Perform a ring buffer flush if we encounter a | |
1106 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1107 | */ | |
1108 | static | |
1109 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1110 | poll_table *wait) | |
1111 | { | |
1112 | unsigned int mask = 0; | |
1113 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
4071a628 | 1114 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
a2a1b5ab MD |
1115 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
1116 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; | |
db2511b4 MD |
1117 | int finalized, disabled; |
1118 | unsigned long consumed, offset; | |
18f12d55 | 1119 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1120 | |
1121 | if (filp->f_mode & FMODE_READ) { | |
1122 | poll_wait_set_exclusive(wait); | |
1123 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1124 | ||
1125 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1126 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1127 | ||
1128 | /* | |
1129 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1130 | * finalized load before offsets loads. | |
1131 | */ | |
1132 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1133 | retry: | |
1134 | if (disabled) | |
1135 | return POLLERR; | |
1136 | ||
1137 | offset = lib_ring_buffer_get_offset(config, buf); | |
1138 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1139 | ||
1140 | /* | |
1141 | * If there is no buffer available to consume. | |
1142 | */ | |
1143 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1144 | /* | |
1145 | * If there is a non-empty subbuffer, flush and try again. | |
1146 | */ | |
18f12d55 | 1147 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1148 | lib_ring_buffer_switch_remote(buf); |
1149 | goto retry; | |
1150 | } | |
1151 | ||
1152 | if (finalized) | |
1153 | return POLLHUP; | |
1154 | else { | |
1155 | /* | |
1156 | * The memory barriers | |
1157 | * __wait_event()/wake_up_interruptible() take | |
1158 | * care of "raw_spin_is_locked" memory ordering. | |
1159 | */ | |
1160 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1161 | goto retry; | |
1162 | else | |
1163 | return 0; | |
1164 | } | |
1165 | } else { | |
1166 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1167 | >= chan->backend.buf_size) | |
1168 | return POLLPRI | POLLRDBAND; | |
1169 | else | |
1170 | return POLLIN | POLLRDNORM; | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | return mask; | |
1175 | } | |
1176 | ||
1177 | /** | |
1178 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1179 | * @inode: opened inode | |
1180 | * @file: opened file | |
1181 | * | |
1182 | * Open implementation. Makes sure only one open instance of a buffer is | |
1183 | * done at a given moment. | |
1184 | */ | |
1185 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1186 | { | |
1187 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
a2a1b5ab | 1188 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1189 | |
1190 | file->private_data = event_notifier_group; | |
1191 | return lib_ring_buffer_open(inode, file, buf); | |
1192 | } | |
1193 | ||
1194 | /** | |
1195 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1196 | * @inode: opened inode | |
1197 | * @file: opened file | |
1198 | * | |
1199 | * Release implementation. | |
1200 | */ | |
1201 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1202 | { | |
1203 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
a2a1b5ab | 1204 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1205 | int ret; |
1206 | ||
1207 | ret = lib_ring_buffer_release(inode, file, buf); | |
1208 | if (ret) | |
1209 | return ret; | |
1210 | fput(event_notifier_group->file); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
21f58fb7 FD |
1214 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1215 | .owner = THIS_MODULE, | |
db2511b4 MD |
1216 | .open = lttng_event_notifier_group_notif_open, |
1217 | .release = lttng_event_notifier_group_notif_release, | |
1218 | .read = lttng_event_notifier_group_notif_read, | |
1219 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1220 | }; |
1221 | ||
d83004aa JD |
1222 | /** |
1223 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1224 | * @filp: the file | |
1225 | * @wait: poll table | |
1226 | * | |
1227 | * Handles the poll operations for the metadata channels. | |
1228 | */ | |
ad1c05e1 | 1229 | static |
d83004aa JD |
1230 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1231 | poll_table *wait) | |
1232 | { | |
1233 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1234 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1235 | int finalized; |
1236 | unsigned int mask = 0; | |
1237 | ||
1238 | if (filp->f_mode & FMODE_READ) { | |
1239 | poll_wait_set_exclusive(wait); | |
1240 | poll_wait(filp, &stream->read_wait, wait); | |
1241 | ||
1242 | finalized = stream->finalized; | |
1243 | ||
1244 | /* | |
1245 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1246 | * ordering finalized load before offsets loads. | |
1247 | */ | |
1248 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1249 | ||
1250 | if (finalized) | |
1251 | mask |= POLLHUP; | |
1252 | ||
92d9f5e6 | 1253 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1254 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1255 | stream->metadata_out) |
d83004aa | 1256 | mask |= POLLIN; |
92d9f5e6 | 1257 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1258 | } |
1259 | ||
1260 | return mask; | |
1261 | } | |
1262 | ||
f613e3e6 MD |
1263 | static |
1264 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1265 | unsigned int cmd, unsigned long arg) | |
1266 | { | |
1267 | struct lttng_metadata_stream *stream = filp->private_data; | |
1268 | ||
1269 | stream->metadata_out = stream->metadata_in; | |
1270 | } | |
1271 | ||
d1344afa JD |
1272 | /* |
1273 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1274 | * the consumer receives the content of the metadata cache unchanged. This is | |
1275 | * different from the metadata_regenerate where the offset from epoch is | |
1276 | * resampled, here we want the exact same content as the last time the metadata | |
1277 | * was generated. This command is only possible if all the metadata written | |
1278 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1279 | * metadata file. | |
1280 | * | |
1281 | * Return 0 on success, a negative value on error. | |
1282 | */ | |
1283 | static | |
1284 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1285 | { | |
1286 | int ret; | |
1287 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1288 | ||
1289 | mutex_lock(&cache->lock); | |
1290 | if (stream->metadata_out != cache->metadata_written) { | |
1291 | ret = -EBUSY; | |
1292 | goto end; | |
1293 | } | |
1294 | stream->metadata_out = 0; | |
1295 | stream->metadata_in = 0; | |
1296 | wake_up_interruptible(&stream->read_wait); | |
1297 | ret = 0; | |
1298 | ||
1299 | end: | |
1300 | mutex_unlock(&cache->lock); | |
1301 | return ret; | |
1302 | } | |
1303 | ||
d83004aa JD |
1304 | static |
1305 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1306 | unsigned int cmd, unsigned long arg) | |
1307 | { | |
1308 | int ret; | |
1309 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1310 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
8b97fd42 MD |
1311 | unsigned int rb_cmd; |
1312 | bool coherent; | |
1313 | ||
606828e4 MD |
1314 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1315 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1316 | else |
1317 | rb_cmd = cmd; | |
d83004aa JD |
1318 | |
1319 | switch (cmd) { | |
606828e4 | 1320 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1321 | { |
35097f36 | 1322 | struct lttng_metadata_stream *stream = filp->private_data; |
a2a1b5ab | 1323 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1324 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 | 1325 | |
8b97fd42 | 1326 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1327 | if (ret > 0) { |
1328 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1329 | ret = 0; | |
1330 | } else if (ret < 0) | |
d83004aa JD |
1331 | goto err; |
1332 | break; | |
1333 | } | |
606828e4 | 1334 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1335 | { |
1336 | /* | |
1337 | * Random access is not allowed for metadata channel. | |
1338 | */ | |
1339 | return -ENOSYS; | |
1340 | } | |
c570be0d MJ |
1341 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: |
1342 | lttng_fallthrough; | |
606828e4 | 1343 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: |
35097f36 JD |
1344 | { |
1345 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1346 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1347 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 JD |
1348 | |
1349 | /* | |
1350 | * Before doing the actual ring buffer flush, write up to one | |
1351 | * packet of metadata in the ring buffer. | |
1352 | */ | |
8b97fd42 | 1353 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1354 | if (ret < 0) |
1355 | goto err; | |
1356 | break; | |
1357 | } | |
606828e4 | 1358 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
9616f0bf JD |
1359 | { |
1360 | struct lttng_metadata_stream *stream = filp->private_data; | |
1361 | ||
1362 | return put_u64(stream->version, arg); | |
1363 | } | |
606828e4 | 1364 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1365 | { |
1366 | struct lttng_metadata_stream *stream = filp->private_data; | |
1367 | ||
1368 | return lttng_metadata_cache_dump(stream); | |
1369 | } | |
606828e4 | 1370 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1371 | { |
1372 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1373 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1374 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
8b97fd42 MD |
1375 | |
1376 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1377 | if (ret > 0) { | |
1378 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1379 | ret = 0; | |
1380 | } else if (ret < 0) { | |
1381 | goto err; | |
1382 | } | |
1383 | break; | |
1384 | } | |
d83004aa JD |
1385 | default: |
1386 | break; | |
1387 | } | |
f613e3e6 MD |
1388 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1389 | ||
d83004aa | 1390 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1391 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1392 | if (ret < 0) |
1393 | goto err; | |
d83004aa | 1394 | |
f613e3e6 | 1395 | switch (cmd) { |
606828e4 | 1396 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1397 | { |
1398 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1399 | cmd, arg); | |
1400 | break; | |
1401 | } | |
606828e4 | 1402 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1403 | { |
1404 | return put_u32(coherent, arg); | |
1405 | } | |
f613e3e6 MD |
1406 | default: |
1407 | break; | |
1408 | } | |
d83004aa JD |
1409 | err: |
1410 | return ret; | |
1411 | } | |
1412 | ||
aeb9064d | 1413 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1414 | static |
1415 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1416 | unsigned int cmd, unsigned long arg) | |
1417 | { | |
1418 | int ret; | |
1419 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1420 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
8b97fd42 MD |
1421 | unsigned int rb_cmd; |
1422 | bool coherent; | |
1423 | ||
606828e4 MD |
1424 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1425 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1426 | else |
1427 | rb_cmd = cmd; | |
d83004aa JD |
1428 | |
1429 | switch (cmd) { | |
606828e4 | 1430 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1431 | { |
35097f36 | 1432 | struct lttng_metadata_stream *stream = filp->private_data; |
a2a1b5ab | 1433 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1434 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 | 1435 | |
8b97fd42 | 1436 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1437 | if (ret > 0) { |
1438 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1439 | ret = 0; | |
1440 | } else if (ret < 0) | |
d83004aa JD |
1441 | goto err; |
1442 | break; | |
1443 | } | |
606828e4 | 1444 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1445 | { |
1446 | /* | |
1447 | * Random access is not allowed for metadata channel. | |
1448 | */ | |
1449 | return -ENOSYS; | |
1450 | } | |
c570be0d MJ |
1451 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: |
1452 | lttng_fallthrough; | |
606828e4 | 1453 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: |
96c55c2f MD |
1454 | { |
1455 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1456 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1457 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
96c55c2f MD |
1458 | |
1459 | /* | |
1460 | * Before doing the actual ring buffer flush, write up to one | |
1461 | * packet of metadata in the ring buffer. | |
1462 | */ | |
8b97fd42 | 1463 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1464 | if (ret < 0) |
1465 | goto err; | |
1466 | break; | |
1467 | } | |
606828e4 | 1468 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
96c55c2f MD |
1469 | { |
1470 | struct lttng_metadata_stream *stream = filp->private_data; | |
1471 | ||
1472 | return put_u64(stream->version, arg); | |
1473 | } | |
606828e4 | 1474 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1475 | { |
1476 | struct lttng_metadata_stream *stream = filp->private_data; | |
1477 | ||
1478 | return lttng_metadata_cache_dump(stream); | |
1479 | } | |
606828e4 | 1480 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1481 | { |
1482 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1483 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1484 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
8b97fd42 MD |
1485 | |
1486 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1487 | if (ret > 0) { | |
1488 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1489 | ret = 0; | |
1490 | } else if (ret < 0) { | |
1491 | goto err; | |
1492 | } | |
1493 | break; | |
1494 | } | |
d83004aa JD |
1495 | default: |
1496 | break; | |
1497 | } | |
f613e3e6 MD |
1498 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1499 | ||
d83004aa | 1500 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1501 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1502 | if (ret < 0) |
1503 | goto err; | |
d83004aa | 1504 | |
f613e3e6 | 1505 | switch (cmd) { |
606828e4 | 1506 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1507 | { |
1508 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1509 | cmd, arg); | |
1510 | break; | |
1511 | } | |
606828e4 | 1512 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1513 | { |
1514 | return put_u32(coherent, arg); | |
1515 | } | |
f613e3e6 MD |
1516 | default: |
1517 | break; | |
1518 | } | |
d83004aa JD |
1519 | err: |
1520 | return ret; | |
1521 | } | |
aeb9064d | 1522 | #endif |
d83004aa | 1523 | |
b3b8072b MD |
1524 | /* |
1525 | * This is not used by anonymous file descriptors. This code is left | |
1526 | * there if we ever want to implement an inode with open() operation. | |
1527 | */ | |
d83004aa JD |
1528 | static |
1529 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1530 | { | |
1531 | struct lttng_metadata_stream *stream = inode->i_private; | |
a2a1b5ab | 1532 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1533 | |
1534 | file->private_data = buf; | |
b3b8072b MD |
1535 | /* |
1536 | * Since life-time of metadata cache differs from that of | |
1537 | * session, we need to keep our own reference on the transport. | |
1538 | */ | |
1539 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1540 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1541 | return -EBUSY; |
1542 | } | |
d83004aa JD |
1543 | return lib_ring_buffer_open(inode, file, buf); |
1544 | } | |
1545 | ||
1546 | static | |
1547 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1548 | { | |
1549 | struct lttng_metadata_stream *stream = file->private_data; | |
a2a1b5ab | 1550 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa | 1551 | |
92143b2c MD |
1552 | mutex_lock(&stream->metadata_cache->lock); |
1553 | list_del(&stream->list); | |
1554 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1555 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1556 | module_put(stream->transport->owner); |
92143b2c | 1557 | kfree(stream); |
d83004aa JD |
1558 | return lib_ring_buffer_release(inode, file, buf); |
1559 | } | |
1560 | ||
1561 | static | |
1562 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1563 | struct pipe_inode_info *pipe, size_t len, | |
1564 | unsigned int flags) | |
1565 | { | |
1566 | struct lttng_metadata_stream *stream = in->private_data; | |
a2a1b5ab | 1567 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1568 | |
1569 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1570 | flags, buf); | |
1571 | } | |
1572 | ||
1573 | static | |
1574 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1575 | struct vm_area_struct *vma) | |
1576 | { | |
1577 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1578 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1579 | |
1580 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1581 | } | |
1582 | ||
1583 | static | |
1584 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1585 | .owner = THIS_MODULE, | |
1586 | .open = lttng_metadata_ring_buffer_open, | |
1587 | .release = lttng_metadata_ring_buffer_release, | |
1588 | .poll = lttng_metadata_ring_buffer_poll, | |
1589 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1590 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1591 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1592 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1593 | #ifdef CONFIG_COMPAT | |
1594 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1595 | #endif | |
1596 | }; | |
1597 | ||
1598 | static | |
1599 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1600 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1601 | { |
ad1c05e1 | 1602 | int stream_fd, ret; |
11b5a3c2 | 1603 | struct file *stream_file; |
ad1c05e1 | 1604 | |
4ac10b76 | 1605 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1606 | if (stream_fd < 0) { |
1607 | ret = stream_fd; | |
1608 | goto fd_error; | |
1609 | } | |
a3fcd499 | 1610 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1611 | if (IS_ERR(stream_file)) { |
1612 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1613 | goto file_error; |
1614 | } | |
409453cb MD |
1615 | /* |
1616 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1617 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1618 | * file descriptor, so we set FMODE_PREAD here. | |
1619 | */ | |
d7b6f197 | 1620 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1621 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1622 | /* |
1623 | * The stream holds a reference to the channel within the generic ring | |
1624 | * buffer library, so no need to hold a refcount on the channel and | |
1625 | * session files here. | |
1626 | */ | |
ad1c05e1 MD |
1627 | return stream_fd; |
1628 | ||
1629 | file_error: | |
1630 | put_unused_fd(stream_fd); | |
d83004aa JD |
1631 | fd_error: |
1632 | return ret; | |
1633 | } | |
1634 | ||
1635 | static | |
1636 | int lttng_abi_open_stream(struct file *channel_file) | |
1637 | { | |
ac847066 | 1638 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
a2a1b5ab | 1639 | struct lttng_kernel_ring_buffer *buf; |
d83004aa JD |
1640 | int ret; |
1641 | void *stream_priv; | |
1642 | ||
ac847066 | 1643 | buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan); |
d83004aa JD |
1644 | if (!buf) |
1645 | return -ENOENT; | |
1646 | ||
1647 | stream_priv = buf; | |
1648 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1649 | <tng_stream_ring_buffer_file_operations, |
1650 | "[lttng_stream]"); | |
d83004aa JD |
1651 | if (ret < 0) |
1652 | goto fd_error; | |
1653 | ||
1654 | return ret; | |
1655 | ||
1656 | fd_error: | |
da1fe18f | 1657 | channel->ops->priv->buffer_read_close(buf); |
d83004aa JD |
1658 | return ret; |
1659 | } | |
1660 | ||
1661 | static | |
1662 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1663 | { | |
ac847066 MD |
1664 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
1665 | struct lttng_kernel_session *session = channel->parent.session; | |
a2a1b5ab | 1666 | struct lttng_kernel_ring_buffer *buf; |
d83004aa JD |
1667 | int ret; |
1668 | struct lttng_metadata_stream *metadata_stream; | |
1669 | void *stream_priv; | |
1670 | ||
ac847066 | 1671 | buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan); |
d83004aa JD |
1672 | if (!buf) |
1673 | return -ENOENT; | |
1674 | ||
1675 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1676 | GFP_KERNEL); | |
b3b8072b MD |
1677 | if (!metadata_stream) { |
1678 | ret = -ENOMEM; | |
1679 | goto nomem; | |
1680 | } | |
a40e3229 | 1681 | metadata_stream->metadata_cache = session->priv->metadata_cache; |
d83004aa JD |
1682 | init_waitqueue_head(&metadata_stream->read_wait); |
1683 | metadata_stream->priv = buf; | |
1684 | stream_priv = metadata_stream; | |
ac847066 | 1685 | metadata_stream->transport = channel->priv->transport; |
8b97fd42 MD |
1686 | /* Initial state is an empty metadata, considered as incoherent. */ |
1687 | metadata_stream->coherent = false; | |
b3b8072b MD |
1688 | |
1689 | /* | |
1690 | * Since life-time of metadata cache differs from that of | |
1691 | * session, we need to keep our own reference on the transport. | |
1692 | */ | |
1693 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1694 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1695 | ret = -EINVAL; |
1696 | goto notransport; | |
1697 | } | |
1698 | ||
a40e3229 | 1699 | if (!lttng_kref_get(&session->priv->metadata_cache->refcount)) { |
901aaa5f | 1700 | ret = -EOVERFLOW; |
9c1f4643 | 1701 | goto kref_error; |
901aaa5f FD |
1702 | } |
1703 | ||
d83004aa | 1704 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1705 | <tng_metadata_ring_buffer_file_operations, |
1706 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1707 | if (ret < 0) |
1708 | goto fd_error; | |
1709 | ||
a40e3229 | 1710 | mutex_lock(&session->priv->metadata_cache->lock); |
d83004aa | 1711 | list_add(&metadata_stream->list, |
a40e3229 MD |
1712 | &session->priv->metadata_cache->metadata_stream); |
1713 | mutex_unlock(&session->priv->metadata_cache->lock); | |
d83004aa JD |
1714 | return ret; |
1715 | ||
ad1c05e1 | 1716 | fd_error: |
a40e3229 | 1717 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
9c1f4643 | 1718 | kref_error: |
b3b8072b MD |
1719 | module_put(metadata_stream->transport->owner); |
1720 | notransport: | |
1721 | kfree(metadata_stream); | |
1722 | nomem: | |
da1fe18f | 1723 | channel->ops->priv->buffer_read_close(buf); |
ad1c05e1 MD |
1724 | return ret; |
1725 | } | |
1726 | ||
21f58fb7 FD |
1727 | static |
1728 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1729 | { | |
1730 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
4071a628 | 1731 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
a2a1b5ab | 1732 | struct lttng_kernel_ring_buffer *buf; |
21f58fb7 FD |
1733 | int ret; |
1734 | void *stream_priv; | |
1735 | ||
da1fe18f | 1736 | buf = event_notifier_group->ops->priv->buffer_read_open(chan); |
21f58fb7 FD |
1737 | if (!buf) |
1738 | return -ENOENT; | |
1739 | ||
1740 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1741 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1742 | ret = -EOVERFLOW; | |
1743 | goto refcount_error; | |
1744 | } | |
1745 | event_notifier_group->buf = buf; | |
1746 | stream_priv = event_notifier_group; | |
1747 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1748 | <tng_event_notifier_group_notif_fops, | |
1749 | "[lttng_event_notifier_stream]"); | |
1750 | if (ret < 0) | |
1751 | goto fd_error; | |
1752 | ||
1753 | return ret; | |
1754 | ||
1755 | fd_error: | |
1756 | atomic_long_dec(¬if_file->f_count); | |
1757 | refcount_error: | |
da1fe18f | 1758 | event_notifier_group->ops->priv->buffer_read_close(buf); |
21f58fb7 FD |
1759 | return ret; |
1760 | } | |
1761 | ||
badfe9f5 | 1762 | static |
606828e4 | 1763 | int lttng_abi_validate_event_param(struct lttng_kernel_abi_event *event_param) |
badfe9f5 MD |
1764 | { |
1765 | /* Limit ABI to implemented features. */ | |
1766 | switch (event_param->instrumentation) { | |
606828e4 | 1767 | case LTTNG_KERNEL_ABI_SYSCALL: |
badfe9f5 | 1768 | switch (event_param->u.syscall.entryexit) { |
c570be0d MJ |
1769 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
1770 | lttng_fallthrough; | |
1771 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: | |
1772 | lttng_fallthrough; | |
606828e4 | 1773 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1774 | break; |
1775 | default: | |
1776 | return -EINVAL; | |
1777 | } | |
1778 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1779 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1780 | break; |
1781 | default: | |
1782 | return -EINVAL; | |
1783 | } | |
1784 | switch (event_param->u.syscall.match) { | |
606828e4 | 1785 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
badfe9f5 MD |
1786 | break; |
1787 | default: | |
1788 | return -EINVAL; | |
1789 | } | |
1790 | break; | |
1791 | ||
606828e4 | 1792 | case LTTNG_KERNEL_ABI_KRETPROBE: |
88a82b17 | 1793 | switch (event_param->u.kretprobe.entryexit) { |
606828e4 | 1794 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
88a82b17 | 1795 | break; |
c570be0d MJ |
1796 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
1797 | lttng_fallthrough; | |
1798 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: | |
1799 | lttng_fallthrough; | |
88a82b17 MD |
1800 | default: |
1801 | return -EINVAL; | |
1802 | } | |
1803 | break; | |
1804 | ||
c570be0d MJ |
1805 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1806 | lttng_fallthrough; | |
1807 | case LTTNG_KERNEL_ABI_KPROBE: | |
1808 | lttng_fallthrough; | |
606828e4 | 1809 | case LTTNG_KERNEL_ABI_UPROBE: |
badfe9f5 MD |
1810 | break; |
1811 | ||
c570be0d MJ |
1812 | case LTTNG_KERNEL_ABI_FUNCTION: |
1813 | lttng_fallthrough; | |
1814 | case LTTNG_KERNEL_ABI_NOOP: | |
1815 | lttng_fallthrough; | |
badfe9f5 MD |
1816 | default: |
1817 | return -EINVAL; | |
1818 | } | |
1819 | return 0; | |
1820 | } | |
1821 | ||
653fe716 | 1822 | static |
c0e31d2e | 1823 | int lttng_abi_create_event(struct file *channel_file, |
606828e4 | 1824 | struct lttng_kernel_abi_event *event_param) |
653fe716 | 1825 | { |
ef784b4d | 1826 | const struct file_operations *fops; |
ac847066 | 1827 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
653fe716 | 1828 | int event_fd, ret; |
11b5a3c2 | 1829 | struct file *event_file; |
3c997079 | 1830 | void *priv; |
653fe716 | 1831 | |
606828e4 | 1832 | event_param->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
6dccd6c1 | 1833 | switch (event_param->instrumentation) { |
606828e4 MD |
1834 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1835 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
7371f44c | 1836 | break; |
606828e4 MD |
1837 | case LTTNG_KERNEL_ABI_KPROBE: |
1838 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
e0a7a7c4 | 1839 | break; |
606828e4 | 1840 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
1841 | WARN_ON_ONCE(1); |
1842 | /* Not implemented. */ | |
e0a7a7c4 MD |
1843 | break; |
1844 | default: | |
1845 | break; | |
1846 | } | |
ef784b4d MD |
1847 | |
1848 | switch (event_param->instrumentation) { | |
c570be0d MJ |
1849 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1850 | lttng_fallthrough; | |
ef784b4d MD |
1851 | case LTTNG_KERNEL_ABI_SYSCALL: |
1852 | fops = <tng_event_recorder_enabler_fops; | |
1853 | break; | |
c570be0d MJ |
1854 | case LTTNG_KERNEL_ABI_KPROBE: |
1855 | lttng_fallthrough; | |
1856 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1857 | lttng_fallthrough; | |
ef784b4d MD |
1858 | case LTTNG_KERNEL_ABI_UPROBE: |
1859 | fops = <tng_event_recorder_event_fops; | |
1860 | break; | |
1861 | ||
c570be0d MJ |
1862 | case LTTNG_KERNEL_ABI_FUNCTION: |
1863 | lttng_fallthrough; | |
1864 | case LTTNG_KERNEL_ABI_NOOP: | |
1865 | lttng_fallthrough; | |
ef784b4d MD |
1866 | default: |
1867 | return -EINVAL; | |
1868 | } | |
1869 | ||
33a39a3c MD |
1870 | event_fd = lttng_get_unused_fd(); |
1871 | if (event_fd < 0) { | |
1872 | ret = event_fd; | |
1873 | goto fd_error; | |
1874 | } | |
1875 | event_file = anon_inode_getfile("[lttng_event]", | |
ef784b4d | 1876 | fops, NULL, O_RDWR); |
33a39a3c MD |
1877 | if (IS_ERR(event_file)) { |
1878 | ret = PTR_ERR(event_file); | |
1879 | goto file_error; | |
1880 | } | |
9c1f4643 | 1881 | /* The event holds a reference on the channel */ |
98d7281c | 1882 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1883 | ret = -EOVERFLOW; |
9c1f4643 MD |
1884 | goto refcount_error; |
1885 | } | |
badfe9f5 MD |
1886 | ret = lttng_abi_validate_event_param(event_param); |
1887 | if (ret) | |
1888 | goto event_error; | |
684a1e4d MD |
1889 | |
1890 | switch (event_param->instrumentation) { | |
c570be0d MJ |
1891 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1892 | lttng_fallthrough; | |
606828e4 | 1893 | case LTTNG_KERNEL_ABI_SYSCALL: |
684a1e4d | 1894 | { |
b2bc0bc8 | 1895 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1896 | |
4993071a PP |
1897 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1898 | /* | |
1899 | * If the event name is a star globbing pattern, | |
1900 | * we create the special star globbing enabler. | |
1901 | */ | |
b2bc0bc8 | 1902 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1903 | event_param, channel); |
3c997079 | 1904 | } else { |
b2bc0bc8 | 1905 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1906 | event_param, channel); |
1ec65de1 | 1907 | } |
b2bc0bc8 | 1908 | priv = event_enabler; |
684a1e4d MD |
1909 | break; |
1910 | } | |
1911 | ||
c570be0d MJ |
1912 | case LTTNG_KERNEL_ABI_KPROBE: |
1913 | lttng_fallthrough; | |
1914 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1915 | lttng_fallthrough; | |
606828e4 | 1916 | case LTTNG_KERNEL_ABI_UPROBE: |
684a1e4d | 1917 | { |
a67ba386 | 1918 | struct lttng_kernel_event_recorder *event; |
4ee2453d | 1919 | |
33a39a3c MD |
1920 | /* |
1921 | * We tolerate no failure path after event creation. It | |
1922 | * will stay invariant for the rest of the session. | |
1923 | */ | |
a67ba386 MD |
1924 | event = lttng_kernel_event_recorder_create(channel, event_param, |
1925 | NULL, event_param->instrumentation); | |
33a39a3c MD |
1926 | WARN_ON_ONCE(!event); |
1927 | if (IS_ERR(event)) { | |
1928 | ret = PTR_ERR(event); | |
1929 | goto event_error; | |
80f87dd2 | 1930 | } |
33a39a3c | 1931 | priv = event; |
684a1e4d MD |
1932 | break; |
1933 | } | |
1934 | ||
c570be0d MJ |
1935 | case LTTNG_KERNEL_ABI_FUNCTION: |
1936 | lttng_fallthrough; | |
1937 | case LTTNG_KERNEL_ABI_NOOP: | |
1938 | lttng_fallthrough; | |
684a1e4d MD |
1939 | default: |
1940 | ret = -EINVAL; | |
1941 | goto event_error; | |
03037b98 | 1942 | } |
33a39a3c MD |
1943 | event_file->private_data = priv; |
1944 | fd_install(event_fd, event_file); | |
653fe716 MD |
1945 | return event_fd; |
1946 | ||
03037b98 | 1947 | event_error: |
9c1f4643 MD |
1948 | atomic_long_dec(&channel_file->f_count); |
1949 | refcount_error: | |
c0e31d2e | 1950 | fput(event_file); |
653fe716 MD |
1951 | file_error: |
1952 | put_unused_fd(event_fd); | |
1953 | fd_error: | |
653fe716 MD |
1954 | return ret; |
1955 | } | |
ad1c05e1 | 1956 | |
dffef45d | 1957 | static |
ef784b4d | 1958 | long lttng_event_notifier_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1959 | { |
a67ba386 | 1960 | struct lttng_kernel_event_notifier *event_notifier = file->private_data; |
dffef45d FD |
1961 | |
1962 | switch (cmd) { | |
606828e4 | 1963 | case LTTNG_KERNEL_ABI_ENABLE: |
9d993668 | 1964 | return lttng_event_enable(&event_notifier->parent); |
606828e4 | 1965 | case LTTNG_KERNEL_ABI_DISABLE: |
9d993668 | 1966 | return lttng_event_disable(&event_notifier->parent); |
606828e4 | 1967 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 1968 | return -EINVAL; |
606828e4 | 1969 | case LTTNG_KERNEL_ABI_CAPTURE: |
ef784b4d | 1970 | return -EINVAL; |
606828e4 | 1971 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
e2d5dbc7 | 1972 | return lttng_event_add_callsite(&event_notifier->parent, |
ef784b4d | 1973 | (struct lttng_kernel_abi_event_callsite __user *) arg); |
dffef45d FD |
1974 | default: |
1975 | return -ENOIOCTLCMD; | |
1976 | } | |
1977 | } | |
1978 | ||
1979 | static | |
ef784b4d | 1980 | long lttng_event_notifier_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1981 | { |
ef784b4d | 1982 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; |
dffef45d | 1983 | |
ef784b4d MD |
1984 | switch (cmd) { |
1985 | case LTTNG_KERNEL_ABI_ENABLE: | |
1986 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
1987 | case LTTNG_KERNEL_ABI_DISABLE: | |
1988 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
1989 | case LTTNG_KERNEL_ABI_FILTER: | |
1990 | return lttng_event_notifier_enabler_attach_filter_bytecode( | |
1991 | event_notifier_enabler, | |
1992 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); | |
1993 | case LTTNG_KERNEL_ABI_CAPTURE: | |
1994 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
1995 | event_notifier_enabler, | |
1996 | (struct lttng_kernel_abi_capture_bytecode __user *) arg); | |
1997 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
1998 | return -EINVAL; | |
dffef45d | 1999 | default: |
ef784b4d | 2000 | return -ENOIOCTLCMD; |
dffef45d | 2001 | } |
ef784b4d | 2002 | } |
dffef45d | 2003 | |
ef784b4d MD |
2004 | static |
2005 | int lttng_event_notifier_event_release(struct inode *inode, struct file *file) | |
2006 | { | |
a67ba386 | 2007 | struct lttng_kernel_event_notifier *event_notifier = file->private_data; |
ef784b4d MD |
2008 | |
2009 | if (event_notifier) | |
a67ba386 | 2010 | fput(event_notifier->priv->group->file); |
dffef45d FD |
2011 | return 0; |
2012 | } | |
2013 | ||
ef784b4d MD |
2014 | static |
2015 | int lttng_event_notifier_enabler_release(struct inode *inode, struct file *file) | |
2016 | { | |
2017 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; | |
2018 | ||
2019 | if (event_notifier_enabler) | |
2020 | fput(event_notifier_enabler->group->file); | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | static const struct file_operations lttng_event_notifier_event_fops = { | |
2025 | .owner = THIS_MODULE, | |
2026 | .release = lttng_event_notifier_event_release, | |
2027 | .unlocked_ioctl = lttng_event_notifier_event_ioctl, | |
2028 | #ifdef CONFIG_COMPAT | |
2029 | .compat_ioctl = lttng_event_notifier_event_ioctl, | |
2030 | #endif | |
2031 | }; | |
2032 | ||
2033 | static const struct file_operations lttng_event_notifier_enabler_fops = { | |
dffef45d | 2034 | .owner = THIS_MODULE, |
ef784b4d MD |
2035 | .release = lttng_event_notifier_enabler_release, |
2036 | .unlocked_ioctl = lttng_event_notifier_enabler_ioctl, | |
dffef45d | 2037 | #ifdef CONFIG_COMPAT |
ef784b4d | 2038 | .compat_ioctl = lttng_event_notifier_enabler_ioctl, |
dffef45d FD |
2039 | #endif |
2040 | }; | |
2041 | ||
2042 | static | |
2043 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
606828e4 | 2044 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2045 | { |
2046 | struct lttng_event_notifier_group *event_notifier_group = | |
2047 | event_notifier_group_file->private_data; | |
ef784b4d | 2048 | const struct file_operations *fops; |
dffef45d FD |
2049 | int event_notifier_fd, ret; |
2050 | struct file *event_notifier_file; | |
2051 | void *priv; | |
2052 | ||
2053 | switch (event_notifier_param->event.instrumentation) { | |
606828e4 MD |
2054 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2055 | case LTTNG_KERNEL_ABI_UPROBE: | |
b01155ba | 2056 | break; |
606828e4 MD |
2057 | case LTTNG_KERNEL_ABI_KPROBE: |
2058 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
2b16f0c9 | 2059 | break; |
606828e4 | 2060 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 | 2061 | break; |
606828e4 | 2062 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9de67196 | 2063 | /* Placing an event notifier on kretprobe is not supported. */ |
606828e4 MD |
2064 | case LTTNG_KERNEL_ABI_FUNCTION: |
2065 | case LTTNG_KERNEL_ABI_NOOP: | |
dffef45d FD |
2066 | default: |
2067 | ret = -EINVAL; | |
2068 | goto inval_instr; | |
2069 | } | |
2070 | ||
ef784b4d | 2071 | switch (event_notifier_param->event.instrumentation) { |
c570be0d MJ |
2072 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2073 | lttng_fallthrough; | |
ef784b4d MD |
2074 | case LTTNG_KERNEL_ABI_SYSCALL: |
2075 | fops = <tng_event_notifier_enabler_fops; | |
2076 | break; | |
c570be0d MJ |
2077 | case LTTNG_KERNEL_ABI_KPROBE: |
2078 | lttng_fallthrough; | |
2079 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
2080 | lttng_fallthrough; | |
ef784b4d MD |
2081 | case LTTNG_KERNEL_ABI_UPROBE: |
2082 | fops = <tng_event_notifier_event_fops; | |
2083 | break; | |
2084 | ||
c570be0d MJ |
2085 | case LTTNG_KERNEL_ABI_FUNCTION: |
2086 | lttng_fallthrough; | |
2087 | case LTTNG_KERNEL_ABI_NOOP: | |
2088 | lttng_fallthrough; | |
ef784b4d MD |
2089 | default: |
2090 | ret = -EINVAL; | |
2091 | goto inval_instr; | |
2092 | } | |
2093 | ||
606828e4 | 2094 | event_notifier_param->event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
dffef45d FD |
2095 | |
2096 | event_notifier_fd = lttng_get_unused_fd(); | |
2097 | if (event_notifier_fd < 0) { | |
2098 | ret = event_notifier_fd; | |
2099 | goto fd_error; | |
2100 | } | |
2101 | ||
2102 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
ef784b4d | 2103 | fops, NULL, O_RDWR); |
dffef45d FD |
2104 | if (IS_ERR(event_notifier_file)) { |
2105 | ret = PTR_ERR(event_notifier_file); | |
2106 | goto file_error; | |
2107 | } | |
2108 | ||
2109 | /* The event notifier holds a reference on the event notifier group. */ | |
2110 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2111 | ret = -EOVERFLOW; | |
2112 | goto refcount_error; | |
2113 | } | |
2114 | ||
56237619 MD |
2115 | ret = lttng_abi_validate_event_param(&event_notifier_param->event); |
2116 | if (ret) | |
2117 | goto event_notifier_error; | |
2118 | ||
684a1e4d | 2119 | switch (event_notifier_param->event.instrumentation) { |
c570be0d MJ |
2120 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2121 | lttng_fallthrough; | |
606828e4 | 2122 | case LTTNG_KERNEL_ABI_SYSCALL: |
684a1e4d | 2123 | { |
dffef45d FD |
2124 | struct lttng_event_notifier_enabler *enabler; |
2125 | ||
2126 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2127 | /* | |
2128 | * If the event name is a star globbing pattern, | |
2129 | * we create the special star globbing enabler. | |
2130 | */ | |
2131 | enabler = lttng_event_notifier_enabler_create( | |
2132 | event_notifier_group, | |
2133 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
2134 | event_notifier_param); | |
2135 | } else { | |
2136 | enabler = lttng_event_notifier_enabler_create( | |
2137 | event_notifier_group, | |
2138 | LTTNG_ENABLER_FORMAT_NAME, | |
2139 | event_notifier_param); | |
2140 | } | |
2141 | priv = enabler; | |
684a1e4d MD |
2142 | break; |
2143 | } | |
2144 | ||
c570be0d MJ |
2145 | case LTTNG_KERNEL_ABI_KPROBE: |
2146 | lttng_fallthrough; | |
2147 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
2148 | lttng_fallthrough; | |
606828e4 | 2149 | case LTTNG_KERNEL_ABI_UPROBE: |
684a1e4d | 2150 | { |
a67ba386 | 2151 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
2152 | |
2153 | /* | |
2154 | * We tolerate no failure path after event notifier creation. | |
2155 | * It will stay invariant for the rest of the session. | |
2156 | */ | |
2157 | event_notifier = lttng_event_notifier_create(NULL, | |
99f52fcc FD |
2158 | event_notifier_param->event.token, |
2159 | event_notifier_param->error_counter_index, | |
2160 | event_notifier_group, | |
a67ba386 | 2161 | event_notifier_param, |
dffef45d FD |
2162 | event_notifier_param->event.instrumentation); |
2163 | WARN_ON_ONCE(!event_notifier); | |
2164 | if (IS_ERR(event_notifier)) { | |
2165 | ret = PTR_ERR(event_notifier); | |
2166 | goto event_notifier_error; | |
2167 | } | |
2168 | priv = event_notifier; | |
684a1e4d MD |
2169 | break; |
2170 | } | |
2171 | ||
c570be0d MJ |
2172 | case LTTNG_KERNEL_ABI_FUNCTION: |
2173 | lttng_fallthrough; | |
2174 | case LTTNG_KERNEL_ABI_NOOP: | |
2175 | lttng_fallthrough; | |
684a1e4d MD |
2176 | default: |
2177 | ret = -EINVAL; | |
2178 | goto event_notifier_error; | |
dffef45d FD |
2179 | } |
2180 | event_notifier_file->private_data = priv; | |
2181 | fd_install(event_notifier_fd, event_notifier_file); | |
2182 | return event_notifier_fd; | |
2183 | ||
2184 | event_notifier_error: | |
2185 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2186 | refcount_error: | |
2187 | fput(event_notifier_file); | |
2188 | file_error: | |
2189 | put_unused_fd(event_notifier_fd); | |
2190 | fd_error: | |
2191 | inval_instr: | |
2192 | return ret; | |
2193 | } | |
2194 | ||
99f52fcc FD |
2195 | static |
2196 | long lttng_abi_event_notifier_group_create_error_counter( | |
2197 | struct file *event_notifier_group_file, | |
606828e4 | 2198 | const struct lttng_kernel_abi_counter_conf *error_counter_conf) |
99f52fcc FD |
2199 | { |
2200 | int counter_fd, ret; | |
2201 | char *counter_transport_name; | |
2202 | size_t counter_len; | |
2203 | struct lttng_counter *counter = NULL; | |
2204 | struct file *counter_file; | |
2205 | struct lttng_event_notifier_group *event_notifier_group = | |
2206 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2207 | ||
606828e4 | 2208 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR) { |
99f52fcc FD |
2209 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); |
2210 | return -EINVAL; | |
2211 | } | |
2212 | ||
2213 | if (error_counter_conf->number_dimensions != 1) { | |
2214 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2215 | return -EINVAL; | |
2216 | } | |
2217 | ||
2218 | switch (error_counter_conf->bitness) { | |
606828e4 | 2219 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64: |
99f52fcc FD |
2220 | counter_transport_name = "counter-per-cpu-64-modular"; |
2221 | break; | |
606828e4 | 2222 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32: |
99f52fcc FD |
2223 | counter_transport_name = "counter-per-cpu-32-modular"; |
2224 | break; | |
2225 | default: | |
2226 | return -EINVAL; | |
2227 | } | |
2228 | ||
2229 | /* | |
2230 | * Lock sessions to provide mutual exclusion against concurrent | |
2231 | * modification of event_notifier group, which would result in | |
2232 | * overwriting the error counter if set concurrently. | |
2233 | */ | |
2234 | lttng_lock_sessions(); | |
2235 | ||
2236 | if (event_notifier_group->error_counter) { | |
2237 | printk(KERN_ERR "Error counter already created in event_notifier group\n"); | |
2238 | ret = -EBUSY; | |
2239 | goto fd_error; | |
2240 | } | |
2241 | ||
2242 | counter_fd = lttng_get_unused_fd(); | |
2243 | if (counter_fd < 0) { | |
2244 | ret = counter_fd; | |
2245 | goto fd_error; | |
2246 | } | |
2247 | ||
2248 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2249 | <tng_counter_fops, | |
2250 | NULL, O_RDONLY); | |
2251 | if (IS_ERR(counter_file)) { | |
2252 | ret = PTR_ERR(counter_file); | |
2253 | goto file_error; | |
2254 | } | |
2255 | ||
2256 | counter_len = error_counter_conf->dimensions[0].size; | |
2257 | ||
2258 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2259 | ret = -EOVERFLOW; | |
2260 | goto refcount_error; | |
2261 | } | |
2262 | ||
2263 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2264 | 1, &counter_len); | |
2265 | if (!counter) { | |
2266 | ret = -EINVAL; | |
2267 | goto counter_error; | |
2268 | } | |
2269 | ||
99f52fcc | 2270 | event_notifier_group->error_counter_len = counter_len; |
ab04d7b1 MD |
2271 | /* |
2272 | * store-release to publish error counter matches load-acquire | |
2273 | * in record_error. Ensures the counter is created and the | |
2274 | * error_counter_len is set before they are used. | |
2275 | */ | |
6657edec | 2276 | lttng_smp_store_release(&event_notifier_group->error_counter, counter); |
99f52fcc FD |
2277 | |
2278 | counter->file = counter_file; | |
2279 | counter->owner = event_notifier_group->file; | |
2280 | counter_file->private_data = counter; | |
2281 | /* Ownership transferred. */ | |
2282 | counter = NULL; | |
2283 | ||
2284 | fd_install(counter_fd, counter_file); | |
2285 | lttng_unlock_sessions(); | |
2286 | ||
2287 | return counter_fd; | |
2288 | ||
2289 | counter_error: | |
2290 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2291 | refcount_error: | |
2292 | fput(counter_file); | |
2293 | file_error: | |
2294 | put_unused_fd(counter_fd); | |
2295 | fd_error: | |
2296 | lttng_unlock_sessions(); | |
2297 | return ret; | |
2298 | } | |
2299 | ||
750b05f2 FD |
2300 | static |
2301 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2302 | unsigned long arg) | |
2303 | { | |
2304 | switch (cmd) { | |
606828e4 | 2305 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
21f58fb7 FD |
2306 | { |
2307 | return lttng_abi_open_event_notifier_group_stream(file); | |
2308 | } | |
606828e4 | 2309 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE: |
dffef45d | 2310 | { |
606828e4 | 2311 | struct lttng_kernel_abi_event_notifier uevent_notifier_param; |
dffef45d FD |
2312 | |
2313 | if (copy_from_user(&uevent_notifier_param, | |
606828e4 | 2314 | (struct lttng_kernel_abi_event_notifier __user *) arg, |
dffef45d FD |
2315 | sizeof(uevent_notifier_param))) |
2316 | return -EFAULT; | |
2317 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2318 | } | |
606828e4 | 2319 | case LTTNG_KERNEL_ABI_COUNTER: |
99f52fcc | 2320 | { |
606828e4 | 2321 | struct lttng_kernel_abi_counter_conf uerror_counter_conf; |
99f52fcc FD |
2322 | |
2323 | if (copy_from_user(&uerror_counter_conf, | |
606828e4 | 2324 | (struct lttng_kernel_abi_counter_conf __user *) arg, |
99f52fcc FD |
2325 | sizeof(uerror_counter_conf))) |
2326 | return -EFAULT; | |
2327 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2328 | &uerror_counter_conf); | |
2329 | } | |
750b05f2 FD |
2330 | default: |
2331 | return -ENOIOCTLCMD; | |
2332 | } | |
2333 | return 0; | |
2334 | } | |
2335 | ||
2336 | static | |
2337 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2338 | { | |
2339 | struct lttng_event_notifier_group *event_notifier_group = | |
2340 | file->private_data; | |
2341 | ||
2342 | if (event_notifier_group) | |
2343 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2344 | return 0; | |
2345 | } | |
2346 | ||
2347 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2348 | .owner = THIS_MODULE, | |
2349 | .release = lttng_event_notifier_group_release, | |
2350 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2351 | #ifdef CONFIG_COMPAT | |
2352 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2353 | #endif | |
2354 | }; | |
2355 | ||
ad1c05e1 MD |
2356 | /** |
2357 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2358 | * | |
c0e31d2e | 2359 | * @file: the file |
ad1c05e1 MD |
2360 | * @cmd: the command |
2361 | * @arg: command arg | |
2362 | * | |
2363 | * This ioctl implements lttng commands: | |
606828e4 | 2364 | * LTTNG_KERNEL_ABI_STREAM |
ad1c05e1 MD |
2365 | * Returns an event stream file descriptor or failure. |
2366 | * (typically, one event stream records events from one CPU) | |
606828e4 | 2367 | * LTTNG_KERNEL_ABI_EVENT |
ad1c05e1 | 2368 | * Returns an event file descriptor or failure. |
606828e4 | 2369 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2370 | * Prepend a context field to each event in the channel |
606828e4 | 2371 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2372 | * Enable recording for events in this channel (weak enable) |
606828e4 | 2373 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2374 | * Disable recording for events in this channel (strong disable) |
baf20995 | 2375 | * |
baf20995 MD |
2376 | * Channel and event file descriptors also hold a reference on the session. |
2377 | */ | |
ad1c05e1 | 2378 | static |
c0e31d2e | 2379 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2380 | { |
ac847066 | 2381 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
8070f5c0 | 2382 | |
baf20995 | 2383 | switch (cmd) { |
606828e4 MD |
2384 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2385 | case LTTNG_KERNEL_ABI_STREAM: | |
c0e31d2e | 2386 | return lttng_abi_open_stream(file); |
606828e4 | 2387 | case LTTNG_KERNEL_ABI_OLD_EVENT: |
6dccd6c1 | 2388 | { |
606828e4 MD |
2389 | struct lttng_kernel_abi_event *uevent_param; |
2390 | struct lttng_kernel_abi_old_event *old_uevent_param; | |
6dccd6c1 JD |
2391 | int ret; |
2392 | ||
606828e4 | 2393 | uevent_param = kmalloc(sizeof(struct lttng_kernel_abi_event), |
6dccd6c1 JD |
2394 | GFP_KERNEL); |
2395 | if (!uevent_param) { | |
2396 | ret = -ENOMEM; | |
2397 | goto old_event_end; | |
2398 | } | |
2399 | old_uevent_param = kmalloc( | |
606828e4 | 2400 | sizeof(struct lttng_kernel_abi_old_event), |
6dccd6c1 JD |
2401 | GFP_KERNEL); |
2402 | if (!old_uevent_param) { | |
2403 | ret = -ENOMEM; | |
2404 | goto old_event_error_free_param; | |
2405 | } | |
2406 | if (copy_from_user(old_uevent_param, | |
606828e4 MD |
2407 | (struct lttng_kernel_abi_old_event __user *) arg, |
2408 | sizeof(struct lttng_kernel_abi_old_event))) { | |
6dccd6c1 JD |
2409 | ret = -EFAULT; |
2410 | goto old_event_error_free_old_param; | |
2411 | } | |
2412 | ||
2413 | memcpy(uevent_param->name, old_uevent_param->name, | |
2414 | sizeof(uevent_param->name)); | |
2415 | uevent_param->instrumentation = | |
2416 | old_uevent_param->instrumentation; | |
2417 | ||
2418 | switch (old_uevent_param->instrumentation) { | |
606828e4 | 2419 | case LTTNG_KERNEL_ABI_KPROBE: |
6dccd6c1 JD |
2420 | uevent_param->u.kprobe.addr = |
2421 | old_uevent_param->u.kprobe.addr; | |
2422 | uevent_param->u.kprobe.offset = | |
2423 | old_uevent_param->u.kprobe.offset; | |
2424 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2425 | old_uevent_param->u.kprobe.symbol_name, | |
2426 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2427 | break; | |
606828e4 | 2428 | case LTTNG_KERNEL_ABI_KRETPROBE: |
6dccd6c1 JD |
2429 | uevent_param->u.kretprobe.addr = |
2430 | old_uevent_param->u.kretprobe.addr; | |
2431 | uevent_param->u.kretprobe.offset = | |
2432 | old_uevent_param->u.kretprobe.offset; | |
2433 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2434 | old_uevent_param->u.kretprobe.symbol_name, | |
2435 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2436 | break; | |
606828e4 | 2437 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
2438 | WARN_ON_ONCE(1); |
2439 | /* Not implemented. */ | |
6dccd6c1 JD |
2440 | break; |
2441 | default: | |
2442 | break; | |
2443 | } | |
2444 | ret = lttng_abi_create_event(file, uevent_param); | |
2445 | ||
2446 | old_event_error_free_old_param: | |
2447 | kfree(old_uevent_param); | |
2448 | old_event_error_free_param: | |
2449 | kfree(uevent_param); | |
2450 | old_event_end: | |
2451 | return ret; | |
2452 | } | |
606828e4 | 2453 | case LTTNG_KERNEL_ABI_EVENT: |
6dccd6c1 | 2454 | { |
606828e4 | 2455 | struct lttng_kernel_abi_event uevent_param; |
6dccd6c1 JD |
2456 | |
2457 | if (copy_from_user(&uevent_param, | |
606828e4 | 2458 | (struct lttng_kernel_abi_event __user *) arg, |
6dccd6c1 JD |
2459 | sizeof(uevent_param))) |
2460 | return -EFAULT; | |
2461 | return lttng_abi_create_event(file, &uevent_param); | |
2462 | } | |
606828e4 | 2463 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2464 | { |
606828e4 MD |
2465 | struct lttng_kernel_abi_context *ucontext_param; |
2466 | struct lttng_kernel_abi_old_context *old_ucontext_param; | |
6dccd6c1 JD |
2467 | int ret; |
2468 | ||
606828e4 | 2469 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_context), |
6dccd6c1 JD |
2470 | GFP_KERNEL); |
2471 | if (!ucontext_param) { | |
2472 | ret = -ENOMEM; | |
2473 | goto old_ctx_end; | |
2474 | } | |
606828e4 | 2475 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_old_context), |
6dccd6c1 JD |
2476 | GFP_KERNEL); |
2477 | if (!old_ucontext_param) { | |
2478 | ret = -ENOMEM; | |
2479 | goto old_ctx_error_free_param; | |
2480 | } | |
2481 | ||
2482 | if (copy_from_user(old_ucontext_param, | |
606828e4 MD |
2483 | (struct lttng_kernel_abi_old_context __user *) arg, |
2484 | sizeof(struct lttng_kernel_abi_old_context))) { | |
6dccd6c1 JD |
2485 | ret = -EFAULT; |
2486 | goto old_ctx_error_free_old_param; | |
2487 | } | |
2488 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2489 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2490 | sizeof(ucontext_param->padding)); | |
2491 | /* only type that uses the union */ | |
606828e4 | 2492 | if (old_ucontext_param->ctx == LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER) { |
6dccd6c1 JD |
2493 | ucontext_param->u.perf_counter.type = |
2494 | old_ucontext_param->u.perf_counter.type; | |
2495 | ucontext_param->u.perf_counter.config = | |
2496 | old_ucontext_param->u.perf_counter.config; | |
2497 | memcpy(ucontext_param->u.perf_counter.name, | |
2498 | old_ucontext_param->u.perf_counter.name, | |
2499 | sizeof(ucontext_param->u.perf_counter.name)); | |
2500 | } | |
2501 | ||
2502 | ret = lttng_abi_add_context(file, | |
2503 | ucontext_param, | |
ac847066 | 2504 | &channel->priv->ctx, channel->parent.session); |
6dccd6c1 JD |
2505 | |
2506 | old_ctx_error_free_old_param: | |
2507 | kfree(old_ucontext_param); | |
2508 | old_ctx_error_free_param: | |
2509 | kfree(ucontext_param); | |
2510 | old_ctx_end: | |
2511 | return ret; | |
2512 | } | |
606828e4 | 2513 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2514 | { |
606828e4 | 2515 | struct lttng_kernel_abi_context ucontext_param; |
6dccd6c1 JD |
2516 | |
2517 | if (copy_from_user(&ucontext_param, | |
606828e4 | 2518 | (struct lttng_kernel_abi_context __user *) arg, |
6dccd6c1 JD |
2519 | sizeof(ucontext_param))) |
2520 | return -EFAULT; | |
2521 | return lttng_abi_add_context(file, | |
2522 | &ucontext_param, | |
ac847066 | 2523 | &channel->priv->ctx, channel->parent.session); |
6dccd6c1 | 2524 | } |
606828e4 MD |
2525 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2526 | case LTTNG_KERNEL_ABI_ENABLE: | |
a90917c3 | 2527 | return lttng_channel_enable(channel); |
606828e4 MD |
2528 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2529 | case LTTNG_KERNEL_ABI_DISABLE: | |
a90917c3 | 2530 | return lttng_channel_disable(channel); |
606828e4 | 2531 | case LTTNG_KERNEL_ABI_SYSCALL_MASK: |
12e579db | 2532 | return lttng_channel_syscall_mask(channel, |
606828e4 | 2533 | (struct lttng_kernel_abi_syscall_mask __user *) arg); |
baf20995 MD |
2534 | default: |
2535 | return -ENOIOCTLCMD; | |
2536 | } | |
2537 | } | |
2538 | ||
5dbbdb43 MD |
2539 | /** |
2540 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2541 | * | |
2542 | * @file: the file | |
2543 | * @cmd: the command | |
2544 | * @arg: command arg | |
2545 | * | |
2546 | * This ioctl implements lttng commands: | |
606828e4 | 2547 | * LTTNG_KERNEL_ABI_STREAM |
5dbbdb43 MD |
2548 | * Returns an event stream file descriptor or failure. |
2549 | * | |
2550 | * Channel and event file descriptors also hold a reference on the session. | |
2551 | */ | |
2552 | static | |
2553 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2554 | { | |
2555 | switch (cmd) { | |
606828e4 MD |
2556 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2557 | case LTTNG_KERNEL_ABI_STREAM: | |
d83004aa | 2558 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2559 | default: |
2560 | return -ENOIOCTLCMD; | |
2561 | } | |
2562 | } | |
2563 | ||
653fe716 MD |
2564 | /** |
2565 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2566 | * | |
c0e31d2e | 2567 | * @file: the file |
653fe716 MD |
2568 | * @wait: poll table |
2569 | */ | |
c0e31d2e | 2570 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2571 | { |
ac847066 | 2572 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
653fe716 MD |
2573 | unsigned int mask = 0; |
2574 | ||
c0e31d2e | 2575 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2576 | poll_wait_set_exclusive(wait); |
ac847066 | 2577 | poll_wait(file, channel->ops->priv->get_hp_wait_queue(channel->priv->rb_chan), |
24cedcfe | 2578 | wait); |
653fe716 | 2579 | |
ac847066 | 2580 | if (channel->ops->priv->is_disabled(channel->priv->rb_chan)) |
254ec7bc | 2581 | return POLLERR; |
ac847066 | 2582 | if (channel->ops->priv->is_finalized(channel->priv->rb_chan)) |
653fe716 | 2583 | return POLLHUP; |
ac847066 | 2584 | if (channel->ops->priv->buffer_has_read_closed_stream(channel->priv->rb_chan)) |
653fe716 | 2585 | return POLLIN | POLLRDNORM; |
f71ecafa | 2586 | return 0; |
653fe716 MD |
2587 | } |
2588 | return mask; | |
2589 | ||
2590 | } | |
2591 | ||
0a84a57f MD |
2592 | static |
2593 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2594 | { | |
ac847066 | 2595 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
c269fff4 MD |
2596 | |
2597 | if (channel) | |
ac847066 | 2598 | fput(channel->parent.session->priv->file); |
0a84a57f MD |
2599 | return 0; |
2600 | } | |
2601 | ||
d83004aa JD |
2602 | static |
2603 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2604 | { | |
ac847066 | 2605 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
d83004aa JD |
2606 | |
2607 | if (channel) { | |
ac847066 | 2608 | fput(channel->parent.session->priv->file); |
a3381417 | 2609 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2610 | } |
2611 | ||
2612 | return 0; | |
2613 | } | |
2614 | ||
ad1c05e1 | 2615 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2616 | .owner = THIS_MODULE, |
03037b98 | 2617 | .release = lttng_channel_release, |
653fe716 | 2618 | .poll = lttng_channel_poll, |
ad1c05e1 | 2619 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2620 | #ifdef CONFIG_COMPAT |
03037b98 | 2621 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2622 | #endif |
11b5a3c2 | 2623 | }; |
baf20995 | 2624 | |
5dbbdb43 | 2625 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2626 | .owner = THIS_MODULE, |
d83004aa | 2627 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2628 | .unlocked_ioctl = lttng_metadata_ioctl, |
2629 | #ifdef CONFIG_COMPAT | |
2630 | .compat_ioctl = lttng_metadata_ioctl, | |
2631 | #endif | |
2632 | }; | |
2633 | ||
8070f5c0 | 2634 | /** |
ef784b4d | 2635 | * lttng_event_recorder_event_ioctl - lttng syscall through ioctl |
8070f5c0 MD |
2636 | * |
2637 | * @file: the file | |
2638 | * @cmd: the command | |
2639 | * @arg: command arg | |
2640 | * | |
2641 | * This ioctl implements lttng commands: | |
606828e4 | 2642 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2643 | * Prepend a context field to each record of this event |
606828e4 | 2644 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2645 | * Enable recording for this event (weak enable) |
606828e4 | 2646 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2647 | * Disable recording for this event (strong disable) |
8070f5c0 MD |
2648 | */ |
2649 | static | |
ef784b4d | 2650 | long lttng_event_recorder_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
8070f5c0 | 2651 | { |
e2d5dbc7 | 2652 | struct lttng_kernel_event_recorder *event_recorder = file->private_data; |
8070f5c0 MD |
2653 | |
2654 | switch (cmd) { | |
606828e4 | 2655 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2656 | { |
3c997079 MD |
2657 | /* Not implemented */ |
2658 | return -ENOSYS; | |
6dccd6c1 | 2659 | } |
606828e4 | 2660 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2661 | { |
3c997079 MD |
2662 | /* Not implemented */ |
2663 | return -ENOSYS; | |
6dccd6c1 | 2664 | } |
606828e4 MD |
2665 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2666 | case LTTNG_KERNEL_ABI_ENABLE: | |
9d993668 | 2667 | return lttng_event_enable(&event_recorder->parent); |
606828e4 MD |
2668 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2669 | case LTTNG_KERNEL_ABI_DISABLE: | |
9d993668 | 2670 | return lttng_event_disable(&event_recorder->parent); |
606828e4 | 2671 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 2672 | return -EINVAL; |
606828e4 | 2673 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
e2d5dbc7 | 2674 | return lttng_event_add_callsite(&event_recorder->parent, |
ef784b4d | 2675 | (struct lttng_kernel_abi_event_callsite __user *) arg); |
8070f5c0 MD |
2676 | default: |
2677 | return -ENOIOCTLCMD; | |
2678 | } | |
2679 | } | |
2680 | ||
ef784b4d MD |
2681 | /** |
2682 | * lttng_event_recorder_enabler_ioctl - lttng syscall through ioctl | |
2683 | * | |
2684 | * @file: the file | |
2685 | * @cmd: the command | |
2686 | * @arg: command arg | |
2687 | * | |
2688 | * This ioctl implements lttng commands: | |
2689 | * LTTNG_KERNEL_ABI_CONTEXT | |
2690 | * Prepend a context field to each record of this event | |
2691 | * LTTNG_KERNEL_ABI_ENABLE | |
2692 | * Enable recording for this event (weak enable) | |
2693 | * LTTNG_KERNEL_ABI_DISABLE | |
2694 | * Disable recording for this event (strong disable) | |
2695 | */ | |
0a84a57f | 2696 | static |
ef784b4d | 2697 | long lttng_event_recorder_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
0a84a57f | 2698 | { |
ef784b4d | 2699 | struct lttng_event_enabler *event_enabler = file->private_data; |
3c997079 | 2700 | |
ef784b4d MD |
2701 | switch (cmd) { |
2702 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: | |
2703 | { | |
2704 | /* Not implemented */ | |
2705 | return -ENOSYS; | |
2706 | } | |
2707 | case LTTNG_KERNEL_ABI_CONTEXT: | |
2708 | { | |
2709 | /* Not implemented */ | |
2710 | return -ENOSYS; | |
2711 | } | |
2712 | case LTTNG_KERNEL_ABI_OLD_ENABLE: | |
2713 | case LTTNG_KERNEL_ABI_ENABLE: | |
2714 | return lttng_event_enabler_enable(event_enabler); | |
2715 | case LTTNG_KERNEL_ABI_OLD_DISABLE: | |
2716 | case LTTNG_KERNEL_ABI_DISABLE: | |
2717 | return lttng_event_enabler_disable(event_enabler); | |
2718 | case LTTNG_KERNEL_ABI_FILTER: | |
2719 | return lttng_event_enabler_attach_filter_bytecode( | |
2720 | event_enabler, | |
2721 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); | |
2722 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
2723 | return -EINVAL; | |
3c997079 | 2724 | default: |
ef784b4d | 2725 | return -ENOIOCTLCMD; |
3c997079 | 2726 | } |
ef784b4d MD |
2727 | } |
2728 | ||
2729 | static | |
2730 | int lttng_event_recorder_event_release(struct inode *inode, struct file *file) | |
2731 | { | |
a67ba386 | 2732 | struct lttng_kernel_event_recorder *event = file->private_data; |
ef784b4d MD |
2733 | |
2734 | if (event) | |
ac847066 | 2735 | fput(event->chan->priv->parent.file); |
ef784b4d MD |
2736 | return 0; |
2737 | } | |
c269fff4 | 2738 | |
ef784b4d MD |
2739 | static |
2740 | int lttng_event_recorder_enabler_release(struct inode *inode, struct file *file) | |
2741 | { | |
2742 | struct lttng_event_enabler *event_enabler = file->private_data; | |
2743 | ||
2744 | if (event_enabler) | |
ac847066 | 2745 | fput(event_enabler->chan->priv->parent.file); |
0a84a57f MD |
2746 | return 0; |
2747 | } | |
2748 | ||
ef784b4d MD |
2749 | static const struct file_operations lttng_event_recorder_event_fops = { |
2750 | .owner = THIS_MODULE, | |
2751 | .release = lttng_event_recorder_event_release, | |
2752 | .unlocked_ioctl = lttng_event_recorder_event_ioctl, | |
2753 | #ifdef CONFIG_COMPAT | |
2754 | .compat_ioctl = lttng_event_recorder_event_ioctl, | |
2755 | #endif | |
2756 | }; | |
2757 | ||
2758 | static const struct file_operations lttng_event_recorder_enabler_fops = { | |
a33c9927 | 2759 | .owner = THIS_MODULE, |
ef784b4d MD |
2760 | .release = lttng_event_recorder_enabler_release, |
2761 | .unlocked_ioctl = lttng_event_recorder_enabler_ioctl, | |
8070f5c0 | 2762 | #ifdef CONFIG_COMPAT |
ef784b4d | 2763 | .compat_ioctl = lttng_event_recorder_enabler_ioctl, |
8070f5c0 | 2764 | #endif |
11b5a3c2 | 2765 | }; |
0a84a57f | 2766 | |
3b731ab1 JD |
2767 | static int put_u64(uint64_t val, unsigned long arg) |
2768 | { | |
2769 | return put_user(val, (uint64_t __user *) arg); | |
2770 | } | |
2771 | ||
8b97fd42 MD |
2772 | static int put_u32(uint32_t val, unsigned long arg) |
2773 | { | |
2774 | return put_user(val, (uint32_t __user *) arg); | |
2775 | } | |
2776 | ||
ed8d02d6 JD |
2777 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2778 | unsigned int cmd, unsigned long arg) | |
2779 | { | |
a2a1b5ab | 2780 | struct lttng_kernel_ring_buffer *buf = filp->private_data; |
4071a628 | 2781 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
a2a1b5ab | 2782 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; |
da1fe18f | 2783 | const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2784 | int ret; |
2785 | ||
2786 | if (atomic_read(&chan->record_disabled)) | |
2787 | return -EIO; | |
2788 | ||
ed8d02d6 | 2789 | switch (cmd) { |
606828e4 | 2790 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2791 | { |
2792 | uint64_t ts; | |
2793 | ||
da1fe18f | 2794 | ret = ops->priv->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2795 | if (ret < 0) |
2796 | goto error; | |
2797 | return put_u64(ts, arg); | |
2798 | } | |
606828e4 | 2799 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END: |
3b731ab1 JD |
2800 | { |
2801 | uint64_t ts; | |
2802 | ||
da1fe18f | 2803 | ret = ops->priv->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2804 | if (ret < 0) |
2805 | goto error; | |
2806 | return put_u64(ts, arg); | |
2807 | } | |
606828e4 | 2808 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2809 | { |
2810 | uint64_t ed; | |
2811 | ||
da1fe18f | 2812 | ret = ops->priv->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2813 | if (ret < 0) |
2814 | goto error; | |
2815 | return put_u64(ed, arg); | |
2816 | } | |
606828e4 | 2817 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE: |
3b731ab1 JD |
2818 | { |
2819 | uint64_t cs; | |
2820 | ||
da1fe18f | 2821 | ret = ops->priv->content_size(config, buf, &cs); |
3b731ab1 JD |
2822 | if (ret < 0) |
2823 | goto error; | |
2824 | return put_u64(cs, arg); | |
2825 | } | |
606828e4 | 2826 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE: |
3b731ab1 JD |
2827 | { |
2828 | uint64_t ps; | |
2829 | ||
da1fe18f | 2830 | ret = ops->priv->packet_size(config, buf, &ps); |
3b731ab1 JD |
2831 | if (ret < 0) |
2832 | goto error; | |
2833 | return put_u64(ps, arg); | |
2834 | } | |
606828e4 | 2835 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID: |
3b731ab1 JD |
2836 | { |
2837 | uint64_t si; | |
2838 | ||
da1fe18f | 2839 | ret = ops->priv->stream_id(config, buf, &si); |
3b731ab1 JD |
2840 | if (ret < 0) |
2841 | goto error; | |
2842 | return put_u64(si, arg); | |
2843 | } | |
606828e4 | 2844 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2845 | { |
2846 | uint64_t ts; | |
2847 | ||
da1fe18f | 2848 | ret = ops->priv->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2849 | if (ret < 0) |
2850 | goto error; | |
2851 | return put_u64(ts, arg); | |
2852 | } | |
606828e4 | 2853 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM: |
5b3cf4f9 JD |
2854 | { |
2855 | uint64_t seq; | |
2856 | ||
da1fe18f | 2857 | ret = ops->priv->sequence_number(config, buf, &seq); |
5b3cf4f9 JD |
2858 | if (ret < 0) |
2859 | goto error; | |
2860 | return put_u64(seq, arg); | |
2861 | } | |
606828e4 | 2862 | case LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID: |
5594698f JD |
2863 | { |
2864 | uint64_t id; | |
2865 | ||
da1fe18f | 2866 | ret = ops->priv->instance_id(config, buf, &id); |
5594698f JD |
2867 | if (ret < 0) |
2868 | goto error; | |
2869 | return put_u64(id, arg); | |
2870 | } | |
3b731ab1 JD |
2871 | default: |
2872 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2873 | cmd, arg); | |
ed8d02d6 | 2874 | } |
3b731ab1 JD |
2875 | |
2876 | error: | |
2877 | return -ENOSYS; | |
ed8d02d6 JD |
2878 | } |
2879 | ||
2880 | #ifdef CONFIG_COMPAT | |
2881 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2882 | unsigned int cmd, unsigned long arg) | |
2883 | { | |
a2a1b5ab | 2884 | struct lttng_kernel_ring_buffer *buf = filp->private_data; |
4071a628 | 2885 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
a2a1b5ab | 2886 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; |
da1fe18f | 2887 | const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2888 | int ret; |
2889 | ||
2890 | if (atomic_read(&chan->record_disabled)) | |
2891 | return -EIO; | |
2892 | ||
ed8d02d6 | 2893 | switch (cmd) { |
606828e4 | 2894 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2895 | { |
2896 | uint64_t ts; | |
2897 | ||
da1fe18f | 2898 | ret = ops->priv->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2899 | if (ret < 0) |
2900 | goto error; | |
2901 | return put_u64(ts, arg); | |
2902 | } | |
606828e4 | 2903 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: |
3b731ab1 JD |
2904 | { |
2905 | uint64_t ts; | |
2906 | ||
da1fe18f | 2907 | ret = ops->priv->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2908 | if (ret < 0) |
2909 | goto error; | |
2910 | return put_u64(ts, arg); | |
2911 | } | |
606828e4 | 2912 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2913 | { |
2914 | uint64_t ed; | |
2915 | ||
da1fe18f | 2916 | ret = ops->priv->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2917 | if (ret < 0) |
2918 | goto error; | |
2919 | return put_u64(ed, arg); | |
ed8d02d6 | 2920 | } |
606828e4 | 2921 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
3b731ab1 JD |
2922 | { |
2923 | uint64_t cs; | |
2924 | ||
da1fe18f | 2925 | ret = ops->priv->content_size(config, buf, &cs); |
3b731ab1 JD |
2926 | if (ret < 0) |
2927 | goto error; | |
2928 | return put_u64(cs, arg); | |
2929 | } | |
606828e4 | 2930 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_PACKET_SIZE: |
3b731ab1 JD |
2931 | { |
2932 | uint64_t ps; | |
2933 | ||
da1fe18f | 2934 | ret = ops->priv->packet_size(config, buf, &ps); |
3b731ab1 JD |
2935 | if (ret < 0) |
2936 | goto error; | |
2937 | return put_u64(ps, arg); | |
2938 | } | |
606828e4 | 2939 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_STREAM_ID: |
3b731ab1 JD |
2940 | { |
2941 | uint64_t si; | |
2942 | ||
da1fe18f | 2943 | ret = ops->priv->stream_id(config, buf, &si); |
3b731ab1 JD |
2944 | if (ret < 0) |
2945 | goto error; | |
2946 | return put_u64(si, arg); | |
2947 | } | |
606828e4 | 2948 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2949 | { |
2950 | uint64_t ts; | |
2951 | ||
da1fe18f | 2952 | ret = ops->priv->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2953 | if (ret < 0) |
2954 | goto error; | |
2955 | return put_u64(ts, arg); | |
2956 | } | |
606828e4 | 2957 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
5b3cf4f9 JD |
2958 | { |
2959 | uint64_t seq; | |
2960 | ||
da1fe18f | 2961 | ret = ops->priv->sequence_number(config, buf, &seq); |
5b3cf4f9 JD |
2962 | if (ret < 0) |
2963 | goto error; | |
2964 | return put_u64(seq, arg); | |
2965 | } | |
606828e4 | 2966 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_INSTANCE_ID: |
5594698f JD |
2967 | { |
2968 | uint64_t id; | |
2969 | ||
da1fe18f | 2970 | ret = ops->priv->instance_id(config, buf, &id); |
5594698f JD |
2971 | if (ret < 0) |
2972 | goto error; | |
2973 | return put_u64(id, arg); | |
2974 | } | |
3b731ab1 JD |
2975 | default: |
2976 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2977 | cmd, arg); | |
2978 | } | |
2979 | ||
2980 | error: | |
2981 | return -ENOSYS; | |
ed8d02d6 JD |
2982 | } |
2983 | #endif /* CONFIG_COMPAT */ | |
2984 | ||
2985 | static void lttng_stream_override_ring_buffer_fops(void) | |
2986 | { | |
2987 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2988 | lttng_stream_ring_buffer_file_operations.open = | |
2989 | lib_ring_buffer_file_operations.open; | |
2990 | lttng_stream_ring_buffer_file_operations.release = | |
2991 | lib_ring_buffer_file_operations.release; | |
2992 | lttng_stream_ring_buffer_file_operations.poll = | |
2993 | lib_ring_buffer_file_operations.poll; | |
2994 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2995 | lib_ring_buffer_file_operations.splice_read; | |
2996 | lttng_stream_ring_buffer_file_operations.mmap = | |
2997 | lib_ring_buffer_file_operations.mmap; | |
2998 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2999 | lttng_stream_ring_buffer_ioctl; | |
3000 | lttng_stream_ring_buffer_file_operations.llseek = | |
3001 | lib_ring_buffer_file_operations.llseek; | |
3002 | #ifdef CONFIG_COMPAT | |
3003 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
3004 | lttng_stream_ring_buffer_compat_ioctl; | |
3005 | #endif | |
3006 | } | |
3007 | ||
80996790 | 3008 | int __init lttng_abi_init(void) |
baf20995 MD |
3009 | { |
3010 | int ret = 0; | |
3011 | ||
263b6c88 | 3012 | wrapper_vmalloc_sync_mappings(); |
2754583e | 3013 | lttng_clock_ref(); |
f771eda6 JD |
3014 | |
3015 | ret = lttng_tp_mempool_init(); | |
3016 | if (ret) { | |
3017 | goto error; | |
3018 | } | |
3019 | ||
d29348f7 | 3020 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 3021 | <tng_proc_ops, NULL); |
2470a237 | 3022 | |
255e52a4 | 3023 | if (!lttng_proc_dentry) { |
5a15f70c | 3024 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
3025 | ret = -ENOMEM; |
3026 | goto error; | |
3027 | } | |
ed8d02d6 | 3028 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 3029 | return 0; |
ed8d02d6 | 3030 | |
baf20995 | 3031 | error: |
f771eda6 | 3032 | lttng_tp_mempool_destroy(); |
2754583e | 3033 | lttng_clock_unref(); |
baf20995 MD |
3034 | return ret; |
3035 | } | |
3036 | ||
e6e65fcd MD |
3037 | /* No __exit annotation because used by init error path too. */ |
3038 | void lttng_abi_exit(void) | |
baf20995 | 3039 | { |
f771eda6 | 3040 | lttng_tp_mempool_destroy(); |
2754583e | 3041 | lttng_clock_unref(); |
e6a17f26 MD |
3042 | if (lttng_proc_dentry) |
3043 | remove_proc_entry("lttng", NULL); | |
baf20995 | 3044 | } |