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) { | |
e8474d9d | 1019 | if (count != 0) { |
db2511b4 MD |
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: | |
e8474d9d MD |
1099 | if (*ppos == 0) |
1100 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1101 | return read_count; |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1106 | * there is data available. Perform a ring buffer flush if we encounter a | |
1107 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1108 | */ | |
1109 | static | |
1110 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1111 | poll_table *wait) | |
1112 | { | |
1113 | unsigned int mask = 0; | |
1114 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
4071a628 | 1115 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
a2a1b5ab MD |
1116 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
1117 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; | |
db2511b4 MD |
1118 | int finalized, disabled; |
1119 | unsigned long consumed, offset; | |
18f12d55 | 1120 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1121 | |
1122 | if (filp->f_mode & FMODE_READ) { | |
1123 | poll_wait_set_exclusive(wait); | |
1124 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1125 | ||
1126 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1127 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1128 | ||
1129 | /* | |
1130 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1131 | * finalized load before offsets loads. | |
1132 | */ | |
1133 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1134 | retry: | |
1135 | if (disabled) | |
1136 | return POLLERR; | |
1137 | ||
1138 | offset = lib_ring_buffer_get_offset(config, buf); | |
1139 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1140 | ||
1141 | /* | |
1142 | * If there is no buffer available to consume. | |
1143 | */ | |
1144 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1145 | /* | |
1146 | * If there is a non-empty subbuffer, flush and try again. | |
1147 | */ | |
18f12d55 | 1148 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1149 | lib_ring_buffer_switch_remote(buf); |
1150 | goto retry; | |
1151 | } | |
1152 | ||
1153 | if (finalized) | |
1154 | return POLLHUP; | |
1155 | else { | |
1156 | /* | |
1157 | * The memory barriers | |
1158 | * __wait_event()/wake_up_interruptible() take | |
1159 | * care of "raw_spin_is_locked" memory ordering. | |
1160 | */ | |
1161 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1162 | goto retry; | |
1163 | else | |
1164 | return 0; | |
1165 | } | |
1166 | } else { | |
1167 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1168 | >= chan->backend.buf_size) | |
1169 | return POLLPRI | POLLRDBAND; | |
1170 | else | |
1171 | return POLLIN | POLLRDNORM; | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | return mask; | |
1176 | } | |
1177 | ||
1178 | /** | |
1179 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1180 | * @inode: opened inode | |
1181 | * @file: opened file | |
1182 | * | |
1183 | * Open implementation. Makes sure only one open instance of a buffer is | |
1184 | * done at a given moment. | |
1185 | */ | |
1186 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1187 | { | |
1188 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
a2a1b5ab | 1189 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1190 | |
1191 | file->private_data = event_notifier_group; | |
1192 | return lib_ring_buffer_open(inode, file, buf); | |
1193 | } | |
1194 | ||
1195 | /** | |
1196 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1197 | * @inode: opened inode | |
1198 | * @file: opened file | |
1199 | * | |
1200 | * Release implementation. | |
1201 | */ | |
1202 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1203 | { | |
1204 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
a2a1b5ab | 1205 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1206 | int ret; |
1207 | ||
1208 | ret = lib_ring_buffer_release(inode, file, buf); | |
1209 | if (ret) | |
1210 | return ret; | |
1211 | fput(event_notifier_group->file); | |
1212 | return 0; | |
1213 | } | |
1214 | ||
21f58fb7 FD |
1215 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1216 | .owner = THIS_MODULE, | |
db2511b4 MD |
1217 | .open = lttng_event_notifier_group_notif_open, |
1218 | .release = lttng_event_notifier_group_notif_release, | |
1219 | .read = lttng_event_notifier_group_notif_read, | |
1220 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1221 | }; |
1222 | ||
d83004aa JD |
1223 | /** |
1224 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1225 | * @filp: the file | |
1226 | * @wait: poll table | |
1227 | * | |
1228 | * Handles the poll operations for the metadata channels. | |
1229 | */ | |
ad1c05e1 | 1230 | static |
d83004aa JD |
1231 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1232 | poll_table *wait) | |
1233 | { | |
1234 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1235 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1236 | int finalized; |
1237 | unsigned int mask = 0; | |
1238 | ||
1239 | if (filp->f_mode & FMODE_READ) { | |
1240 | poll_wait_set_exclusive(wait); | |
1241 | poll_wait(filp, &stream->read_wait, wait); | |
1242 | ||
1243 | finalized = stream->finalized; | |
1244 | ||
1245 | /* | |
1246 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1247 | * ordering finalized load before offsets loads. | |
1248 | */ | |
1249 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1250 | ||
1251 | if (finalized) | |
1252 | mask |= POLLHUP; | |
1253 | ||
92d9f5e6 | 1254 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1255 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1256 | stream->metadata_out) |
d83004aa | 1257 | mask |= POLLIN; |
92d9f5e6 | 1258 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1259 | } |
1260 | ||
1261 | return mask; | |
1262 | } | |
1263 | ||
f613e3e6 MD |
1264 | static |
1265 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1266 | unsigned int cmd, unsigned long arg) | |
1267 | { | |
1268 | struct lttng_metadata_stream *stream = filp->private_data; | |
1269 | ||
1270 | stream->metadata_out = stream->metadata_in; | |
1271 | } | |
1272 | ||
d1344afa JD |
1273 | /* |
1274 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1275 | * the consumer receives the content of the metadata cache unchanged. This is | |
1276 | * different from the metadata_regenerate where the offset from epoch is | |
1277 | * resampled, here we want the exact same content as the last time the metadata | |
1278 | * was generated. This command is only possible if all the metadata written | |
1279 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1280 | * metadata file. | |
1281 | * | |
1282 | * Return 0 on success, a negative value on error. | |
1283 | */ | |
1284 | static | |
1285 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1286 | { | |
1287 | int ret; | |
1288 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1289 | ||
1290 | mutex_lock(&cache->lock); | |
1291 | if (stream->metadata_out != cache->metadata_written) { | |
1292 | ret = -EBUSY; | |
1293 | goto end; | |
1294 | } | |
1295 | stream->metadata_out = 0; | |
1296 | stream->metadata_in = 0; | |
1297 | wake_up_interruptible(&stream->read_wait); | |
1298 | ret = 0; | |
1299 | ||
1300 | end: | |
1301 | mutex_unlock(&cache->lock); | |
1302 | return ret; | |
1303 | } | |
1304 | ||
d83004aa JD |
1305 | static |
1306 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1307 | unsigned int cmd, unsigned long arg) | |
1308 | { | |
1309 | int ret; | |
1310 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1311 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
8b97fd42 MD |
1312 | unsigned int rb_cmd; |
1313 | bool coherent; | |
1314 | ||
606828e4 MD |
1315 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1316 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1317 | else |
1318 | rb_cmd = cmd; | |
d83004aa JD |
1319 | |
1320 | switch (cmd) { | |
606828e4 | 1321 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1322 | { |
35097f36 | 1323 | struct lttng_metadata_stream *stream = filp->private_data; |
a2a1b5ab | 1324 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1325 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 | 1326 | |
8b97fd42 | 1327 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1328 | if (ret > 0) { |
1329 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1330 | ret = 0; | |
1331 | } else if (ret < 0) | |
d83004aa JD |
1332 | goto err; |
1333 | break; | |
1334 | } | |
606828e4 | 1335 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1336 | { |
1337 | /* | |
1338 | * Random access is not allowed for metadata channel. | |
1339 | */ | |
1340 | return -ENOSYS; | |
1341 | } | |
c570be0d MJ |
1342 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: |
1343 | lttng_fallthrough; | |
606828e4 | 1344 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: |
35097f36 JD |
1345 | { |
1346 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1347 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1348 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 JD |
1349 | |
1350 | /* | |
1351 | * Before doing the actual ring buffer flush, write up to one | |
1352 | * packet of metadata in the ring buffer. | |
1353 | */ | |
8b97fd42 | 1354 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1355 | if (ret < 0) |
1356 | goto err; | |
1357 | break; | |
1358 | } | |
606828e4 | 1359 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
9616f0bf JD |
1360 | { |
1361 | struct lttng_metadata_stream *stream = filp->private_data; | |
1362 | ||
1363 | return put_u64(stream->version, arg); | |
1364 | } | |
606828e4 | 1365 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1366 | { |
1367 | struct lttng_metadata_stream *stream = filp->private_data; | |
1368 | ||
1369 | return lttng_metadata_cache_dump(stream); | |
1370 | } | |
606828e4 | 1371 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1372 | { |
1373 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1374 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1375 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
8b97fd42 MD |
1376 | |
1377 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1378 | if (ret > 0) { | |
1379 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1380 | ret = 0; | |
1381 | } else if (ret < 0) { | |
1382 | goto err; | |
1383 | } | |
1384 | break; | |
1385 | } | |
d83004aa JD |
1386 | default: |
1387 | break; | |
1388 | } | |
f613e3e6 MD |
1389 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1390 | ||
d83004aa | 1391 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1392 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1393 | if (ret < 0) |
1394 | goto err; | |
d83004aa | 1395 | |
f613e3e6 | 1396 | switch (cmd) { |
606828e4 | 1397 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1398 | { |
1399 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1400 | cmd, arg); | |
1401 | break; | |
1402 | } | |
606828e4 | 1403 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1404 | { |
1405 | return put_u32(coherent, arg); | |
1406 | } | |
f613e3e6 MD |
1407 | default: |
1408 | break; | |
1409 | } | |
d83004aa JD |
1410 | err: |
1411 | return ret; | |
1412 | } | |
1413 | ||
aeb9064d | 1414 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1415 | static |
1416 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1417 | unsigned int cmd, unsigned long arg) | |
1418 | { | |
1419 | int ret; | |
1420 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1421 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
8b97fd42 MD |
1422 | unsigned int rb_cmd; |
1423 | bool coherent; | |
1424 | ||
606828e4 MD |
1425 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1426 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1427 | else |
1428 | rb_cmd = cmd; | |
d83004aa JD |
1429 | |
1430 | switch (cmd) { | |
606828e4 | 1431 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1432 | { |
35097f36 | 1433 | struct lttng_metadata_stream *stream = filp->private_data; |
a2a1b5ab | 1434 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1435 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 | 1436 | |
8b97fd42 | 1437 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1438 | if (ret > 0) { |
1439 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1440 | ret = 0; | |
1441 | } else if (ret < 0) | |
d83004aa JD |
1442 | goto err; |
1443 | break; | |
1444 | } | |
606828e4 | 1445 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1446 | { |
1447 | /* | |
1448 | * Random access is not allowed for metadata channel. | |
1449 | */ | |
1450 | return -ENOSYS; | |
1451 | } | |
c570be0d MJ |
1452 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: |
1453 | lttng_fallthrough; | |
606828e4 | 1454 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: |
96c55c2f MD |
1455 | { |
1456 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1457 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1458 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
96c55c2f MD |
1459 | |
1460 | /* | |
1461 | * Before doing the actual ring buffer flush, write up to one | |
1462 | * packet of metadata in the ring buffer. | |
1463 | */ | |
8b97fd42 | 1464 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1465 | if (ret < 0) |
1466 | goto err; | |
1467 | break; | |
1468 | } | |
606828e4 | 1469 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
96c55c2f MD |
1470 | { |
1471 | struct lttng_metadata_stream *stream = filp->private_data; | |
1472 | ||
1473 | return put_u64(stream->version, arg); | |
1474 | } | |
606828e4 | 1475 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1476 | { |
1477 | struct lttng_metadata_stream *stream = filp->private_data; | |
1478 | ||
1479 | return lttng_metadata_cache_dump(stream); | |
1480 | } | |
606828e4 | 1481 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1482 | { |
1483 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1484 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
4071a628 | 1485 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
8b97fd42 MD |
1486 | |
1487 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1488 | if (ret > 0) { | |
1489 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1490 | ret = 0; | |
1491 | } else if (ret < 0) { | |
1492 | goto err; | |
1493 | } | |
1494 | break; | |
1495 | } | |
d83004aa JD |
1496 | default: |
1497 | break; | |
1498 | } | |
f613e3e6 MD |
1499 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1500 | ||
d83004aa | 1501 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1502 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1503 | if (ret < 0) |
1504 | goto err; | |
d83004aa | 1505 | |
f613e3e6 | 1506 | switch (cmd) { |
606828e4 | 1507 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1508 | { |
1509 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1510 | cmd, arg); | |
1511 | break; | |
1512 | } | |
606828e4 | 1513 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1514 | { |
1515 | return put_u32(coherent, arg); | |
1516 | } | |
f613e3e6 MD |
1517 | default: |
1518 | break; | |
1519 | } | |
d83004aa JD |
1520 | err: |
1521 | return ret; | |
1522 | } | |
aeb9064d | 1523 | #endif |
d83004aa | 1524 | |
b3b8072b MD |
1525 | /* |
1526 | * This is not used by anonymous file descriptors. This code is left | |
1527 | * there if we ever want to implement an inode with open() operation. | |
1528 | */ | |
d83004aa JD |
1529 | static |
1530 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1531 | { | |
1532 | struct lttng_metadata_stream *stream = inode->i_private; | |
a2a1b5ab | 1533 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1534 | |
1535 | file->private_data = buf; | |
b3b8072b MD |
1536 | /* |
1537 | * Since life-time of metadata cache differs from that of | |
1538 | * session, we need to keep our own reference on the transport. | |
1539 | */ | |
1540 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1541 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1542 | return -EBUSY; |
1543 | } | |
d83004aa JD |
1544 | return lib_ring_buffer_open(inode, file, buf); |
1545 | } | |
1546 | ||
1547 | static | |
1548 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1549 | { | |
1550 | struct lttng_metadata_stream *stream = file->private_data; | |
a2a1b5ab | 1551 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa | 1552 | |
92143b2c MD |
1553 | mutex_lock(&stream->metadata_cache->lock); |
1554 | list_del(&stream->list); | |
1555 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1556 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1557 | module_put(stream->transport->owner); |
92143b2c | 1558 | kfree(stream); |
d83004aa JD |
1559 | return lib_ring_buffer_release(inode, file, buf); |
1560 | } | |
1561 | ||
1562 | static | |
1563 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1564 | struct pipe_inode_info *pipe, size_t len, | |
1565 | unsigned int flags) | |
1566 | { | |
1567 | struct lttng_metadata_stream *stream = in->private_data; | |
a2a1b5ab | 1568 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1569 | |
1570 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1571 | flags, buf); | |
1572 | } | |
1573 | ||
1574 | static | |
1575 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1576 | struct vm_area_struct *vma) | |
1577 | { | |
1578 | struct lttng_metadata_stream *stream = filp->private_data; | |
a2a1b5ab | 1579 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1580 | |
1581 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1582 | } | |
1583 | ||
1584 | static | |
1585 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1586 | .owner = THIS_MODULE, | |
1587 | .open = lttng_metadata_ring_buffer_open, | |
1588 | .release = lttng_metadata_ring_buffer_release, | |
1589 | .poll = lttng_metadata_ring_buffer_poll, | |
1590 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1591 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1592 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1593 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1594 | #ifdef CONFIG_COMPAT | |
1595 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1596 | #endif | |
1597 | }; | |
1598 | ||
1599 | static | |
1600 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1601 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1602 | { |
ad1c05e1 | 1603 | int stream_fd, ret; |
11b5a3c2 | 1604 | struct file *stream_file; |
ad1c05e1 | 1605 | |
4ac10b76 | 1606 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1607 | if (stream_fd < 0) { |
1608 | ret = stream_fd; | |
1609 | goto fd_error; | |
1610 | } | |
a3fcd499 | 1611 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1612 | if (IS_ERR(stream_file)) { |
1613 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1614 | goto file_error; |
1615 | } | |
409453cb MD |
1616 | /* |
1617 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1618 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1619 | * file descriptor, so we set FMODE_PREAD here. | |
1620 | */ | |
d7b6f197 | 1621 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1622 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1623 | /* |
1624 | * The stream holds a reference to the channel within the generic ring | |
1625 | * buffer library, so no need to hold a refcount on the channel and | |
1626 | * session files here. | |
1627 | */ | |
ad1c05e1 MD |
1628 | return stream_fd; |
1629 | ||
1630 | file_error: | |
1631 | put_unused_fd(stream_fd); | |
d83004aa JD |
1632 | fd_error: |
1633 | return ret; | |
1634 | } | |
1635 | ||
1636 | static | |
1637 | int lttng_abi_open_stream(struct file *channel_file) | |
1638 | { | |
ac847066 | 1639 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
a2a1b5ab | 1640 | struct lttng_kernel_ring_buffer *buf; |
d83004aa JD |
1641 | int ret; |
1642 | void *stream_priv; | |
1643 | ||
ac847066 | 1644 | buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan); |
d83004aa JD |
1645 | if (!buf) |
1646 | return -ENOENT; | |
1647 | ||
1648 | stream_priv = buf; | |
1649 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1650 | <tng_stream_ring_buffer_file_operations, |
1651 | "[lttng_stream]"); | |
d83004aa JD |
1652 | if (ret < 0) |
1653 | goto fd_error; | |
1654 | ||
1655 | return ret; | |
1656 | ||
1657 | fd_error: | |
da1fe18f | 1658 | channel->ops->priv->buffer_read_close(buf); |
d83004aa JD |
1659 | return ret; |
1660 | } | |
1661 | ||
1662 | static | |
1663 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1664 | { | |
ac847066 MD |
1665 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
1666 | struct lttng_kernel_session *session = channel->parent.session; | |
a2a1b5ab | 1667 | struct lttng_kernel_ring_buffer *buf; |
d83004aa JD |
1668 | int ret; |
1669 | struct lttng_metadata_stream *metadata_stream; | |
1670 | void *stream_priv; | |
1671 | ||
ac847066 | 1672 | buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan); |
d83004aa JD |
1673 | if (!buf) |
1674 | return -ENOENT; | |
1675 | ||
1676 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1677 | GFP_KERNEL); | |
b3b8072b MD |
1678 | if (!metadata_stream) { |
1679 | ret = -ENOMEM; | |
1680 | goto nomem; | |
1681 | } | |
a40e3229 | 1682 | metadata_stream->metadata_cache = session->priv->metadata_cache; |
d83004aa JD |
1683 | init_waitqueue_head(&metadata_stream->read_wait); |
1684 | metadata_stream->priv = buf; | |
1685 | stream_priv = metadata_stream; | |
ac847066 | 1686 | metadata_stream->transport = channel->priv->transport; |
8b97fd42 MD |
1687 | /* Initial state is an empty metadata, considered as incoherent. */ |
1688 | metadata_stream->coherent = false; | |
b3b8072b MD |
1689 | |
1690 | /* | |
1691 | * Since life-time of metadata cache differs from that of | |
1692 | * session, we need to keep our own reference on the transport. | |
1693 | */ | |
1694 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1695 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1696 | ret = -EINVAL; |
1697 | goto notransport; | |
1698 | } | |
1699 | ||
a40e3229 | 1700 | if (!lttng_kref_get(&session->priv->metadata_cache->refcount)) { |
901aaa5f | 1701 | ret = -EOVERFLOW; |
9c1f4643 | 1702 | goto kref_error; |
901aaa5f FD |
1703 | } |
1704 | ||
d83004aa | 1705 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1706 | <tng_metadata_ring_buffer_file_operations, |
1707 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1708 | if (ret < 0) |
1709 | goto fd_error; | |
1710 | ||
a40e3229 | 1711 | mutex_lock(&session->priv->metadata_cache->lock); |
d83004aa | 1712 | list_add(&metadata_stream->list, |
a40e3229 MD |
1713 | &session->priv->metadata_cache->metadata_stream); |
1714 | mutex_unlock(&session->priv->metadata_cache->lock); | |
d83004aa JD |
1715 | return ret; |
1716 | ||
ad1c05e1 | 1717 | fd_error: |
a40e3229 | 1718 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
9c1f4643 | 1719 | kref_error: |
b3b8072b MD |
1720 | module_put(metadata_stream->transport->owner); |
1721 | notransport: | |
1722 | kfree(metadata_stream); | |
1723 | nomem: | |
da1fe18f | 1724 | channel->ops->priv->buffer_read_close(buf); |
ad1c05e1 MD |
1725 | return ret; |
1726 | } | |
1727 | ||
21f58fb7 FD |
1728 | static |
1729 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1730 | { | |
1731 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
4071a628 | 1732 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
a2a1b5ab | 1733 | struct lttng_kernel_ring_buffer *buf; |
21f58fb7 FD |
1734 | int ret; |
1735 | void *stream_priv; | |
1736 | ||
da1fe18f | 1737 | buf = event_notifier_group->ops->priv->buffer_read_open(chan); |
21f58fb7 FD |
1738 | if (!buf) |
1739 | return -ENOENT; | |
1740 | ||
1741 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1742 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1743 | ret = -EOVERFLOW; | |
1744 | goto refcount_error; | |
1745 | } | |
1746 | event_notifier_group->buf = buf; | |
1747 | stream_priv = event_notifier_group; | |
1748 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1749 | <tng_event_notifier_group_notif_fops, | |
1750 | "[lttng_event_notifier_stream]"); | |
1751 | if (ret < 0) | |
1752 | goto fd_error; | |
1753 | ||
1754 | return ret; | |
1755 | ||
1756 | fd_error: | |
1757 | atomic_long_dec(¬if_file->f_count); | |
1758 | refcount_error: | |
da1fe18f | 1759 | event_notifier_group->ops->priv->buffer_read_close(buf); |
21f58fb7 FD |
1760 | return ret; |
1761 | } | |
1762 | ||
badfe9f5 | 1763 | static |
606828e4 | 1764 | int lttng_abi_validate_event_param(struct lttng_kernel_abi_event *event_param) |
badfe9f5 MD |
1765 | { |
1766 | /* Limit ABI to implemented features. */ | |
1767 | switch (event_param->instrumentation) { | |
606828e4 | 1768 | case LTTNG_KERNEL_ABI_SYSCALL: |
badfe9f5 | 1769 | switch (event_param->u.syscall.entryexit) { |
c570be0d MJ |
1770 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
1771 | lttng_fallthrough; | |
1772 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: | |
1773 | lttng_fallthrough; | |
606828e4 | 1774 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1775 | break; |
1776 | default: | |
1777 | return -EINVAL; | |
1778 | } | |
1779 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1780 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1781 | break; |
1782 | default: | |
1783 | return -EINVAL; | |
1784 | } | |
1785 | switch (event_param->u.syscall.match) { | |
606828e4 | 1786 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
badfe9f5 MD |
1787 | break; |
1788 | default: | |
1789 | return -EINVAL; | |
1790 | } | |
1791 | break; | |
1792 | ||
606828e4 | 1793 | case LTTNG_KERNEL_ABI_KRETPROBE: |
88a82b17 | 1794 | switch (event_param->u.kretprobe.entryexit) { |
606828e4 | 1795 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
88a82b17 | 1796 | break; |
c570be0d MJ |
1797 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
1798 | lttng_fallthrough; | |
1799 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: | |
1800 | lttng_fallthrough; | |
88a82b17 MD |
1801 | default: |
1802 | return -EINVAL; | |
1803 | } | |
1804 | break; | |
1805 | ||
c570be0d MJ |
1806 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1807 | lttng_fallthrough; | |
1808 | case LTTNG_KERNEL_ABI_KPROBE: | |
1809 | lttng_fallthrough; | |
606828e4 | 1810 | case LTTNG_KERNEL_ABI_UPROBE: |
badfe9f5 MD |
1811 | break; |
1812 | ||
c570be0d MJ |
1813 | case LTTNG_KERNEL_ABI_FUNCTION: |
1814 | lttng_fallthrough; | |
1815 | case LTTNG_KERNEL_ABI_NOOP: | |
1816 | lttng_fallthrough; | |
badfe9f5 MD |
1817 | default: |
1818 | return -EINVAL; | |
1819 | } | |
1820 | return 0; | |
1821 | } | |
1822 | ||
653fe716 | 1823 | static |
c0e31d2e | 1824 | int lttng_abi_create_event(struct file *channel_file, |
606828e4 | 1825 | struct lttng_kernel_abi_event *event_param) |
653fe716 | 1826 | { |
ef784b4d | 1827 | const struct file_operations *fops; |
ac847066 | 1828 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
653fe716 | 1829 | int event_fd, ret; |
11b5a3c2 | 1830 | struct file *event_file; |
3c997079 | 1831 | void *priv; |
653fe716 | 1832 | |
606828e4 | 1833 | event_param->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
6dccd6c1 | 1834 | switch (event_param->instrumentation) { |
606828e4 MD |
1835 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1836 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
7371f44c | 1837 | break; |
606828e4 MD |
1838 | case LTTNG_KERNEL_ABI_KPROBE: |
1839 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
e0a7a7c4 | 1840 | break; |
606828e4 | 1841 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
1842 | WARN_ON_ONCE(1); |
1843 | /* Not implemented. */ | |
e0a7a7c4 MD |
1844 | break; |
1845 | default: | |
1846 | break; | |
1847 | } | |
ef784b4d MD |
1848 | |
1849 | switch (event_param->instrumentation) { | |
c570be0d MJ |
1850 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1851 | lttng_fallthrough; | |
ef784b4d MD |
1852 | case LTTNG_KERNEL_ABI_SYSCALL: |
1853 | fops = <tng_event_recorder_enabler_fops; | |
1854 | break; | |
c570be0d MJ |
1855 | case LTTNG_KERNEL_ABI_KPROBE: |
1856 | lttng_fallthrough; | |
1857 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1858 | lttng_fallthrough; | |
ef784b4d MD |
1859 | case LTTNG_KERNEL_ABI_UPROBE: |
1860 | fops = <tng_event_recorder_event_fops; | |
1861 | break; | |
1862 | ||
c570be0d MJ |
1863 | case LTTNG_KERNEL_ABI_FUNCTION: |
1864 | lttng_fallthrough; | |
1865 | case LTTNG_KERNEL_ABI_NOOP: | |
1866 | lttng_fallthrough; | |
ef784b4d MD |
1867 | default: |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
33a39a3c MD |
1871 | event_fd = lttng_get_unused_fd(); |
1872 | if (event_fd < 0) { | |
1873 | ret = event_fd; | |
1874 | goto fd_error; | |
1875 | } | |
1876 | event_file = anon_inode_getfile("[lttng_event]", | |
ef784b4d | 1877 | fops, NULL, O_RDWR); |
33a39a3c MD |
1878 | if (IS_ERR(event_file)) { |
1879 | ret = PTR_ERR(event_file); | |
1880 | goto file_error; | |
1881 | } | |
9c1f4643 | 1882 | /* The event holds a reference on the channel */ |
98d7281c | 1883 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1884 | ret = -EOVERFLOW; |
9c1f4643 MD |
1885 | goto refcount_error; |
1886 | } | |
badfe9f5 MD |
1887 | ret = lttng_abi_validate_event_param(event_param); |
1888 | if (ret) | |
1889 | goto event_error; | |
684a1e4d MD |
1890 | |
1891 | switch (event_param->instrumentation) { | |
c570be0d MJ |
1892 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1893 | lttng_fallthrough; | |
606828e4 | 1894 | case LTTNG_KERNEL_ABI_SYSCALL: |
684a1e4d | 1895 | { |
b2bc0bc8 | 1896 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1897 | |
4993071a PP |
1898 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1899 | /* | |
1900 | * If the event name is a star globbing pattern, | |
1901 | * we create the special star globbing enabler. | |
1902 | */ | |
b2bc0bc8 | 1903 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1904 | event_param, channel); |
3c997079 | 1905 | } else { |
b2bc0bc8 | 1906 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1907 | event_param, channel); |
1ec65de1 | 1908 | } |
b2bc0bc8 | 1909 | priv = event_enabler; |
684a1e4d MD |
1910 | break; |
1911 | } | |
1912 | ||
c570be0d MJ |
1913 | case LTTNG_KERNEL_ABI_KPROBE: |
1914 | lttng_fallthrough; | |
1915 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1916 | lttng_fallthrough; | |
606828e4 | 1917 | case LTTNG_KERNEL_ABI_UPROBE: |
684a1e4d | 1918 | { |
a67ba386 | 1919 | struct lttng_kernel_event_recorder *event; |
4ee2453d | 1920 | |
33a39a3c MD |
1921 | /* |
1922 | * We tolerate no failure path after event creation. It | |
1923 | * will stay invariant for the rest of the session. | |
1924 | */ | |
a67ba386 MD |
1925 | event = lttng_kernel_event_recorder_create(channel, event_param, |
1926 | NULL, event_param->instrumentation); | |
33a39a3c MD |
1927 | WARN_ON_ONCE(!event); |
1928 | if (IS_ERR(event)) { | |
1929 | ret = PTR_ERR(event); | |
1930 | goto event_error; | |
80f87dd2 | 1931 | } |
33a39a3c | 1932 | priv = event; |
684a1e4d MD |
1933 | break; |
1934 | } | |
1935 | ||
c570be0d MJ |
1936 | case LTTNG_KERNEL_ABI_FUNCTION: |
1937 | lttng_fallthrough; | |
1938 | case LTTNG_KERNEL_ABI_NOOP: | |
1939 | lttng_fallthrough; | |
684a1e4d MD |
1940 | default: |
1941 | ret = -EINVAL; | |
1942 | goto event_error; | |
03037b98 | 1943 | } |
33a39a3c MD |
1944 | event_file->private_data = priv; |
1945 | fd_install(event_fd, event_file); | |
653fe716 MD |
1946 | return event_fd; |
1947 | ||
03037b98 | 1948 | event_error: |
9c1f4643 MD |
1949 | atomic_long_dec(&channel_file->f_count); |
1950 | refcount_error: | |
c0e31d2e | 1951 | fput(event_file); |
653fe716 MD |
1952 | file_error: |
1953 | put_unused_fd(event_fd); | |
1954 | fd_error: | |
653fe716 MD |
1955 | return ret; |
1956 | } | |
ad1c05e1 | 1957 | |
dffef45d | 1958 | static |
ef784b4d | 1959 | long lttng_event_notifier_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1960 | { |
a67ba386 | 1961 | struct lttng_kernel_event_notifier *event_notifier = file->private_data; |
dffef45d FD |
1962 | |
1963 | switch (cmd) { | |
606828e4 | 1964 | case LTTNG_KERNEL_ABI_ENABLE: |
9d993668 | 1965 | return lttng_event_enable(&event_notifier->parent); |
606828e4 | 1966 | case LTTNG_KERNEL_ABI_DISABLE: |
9d993668 | 1967 | return lttng_event_disable(&event_notifier->parent); |
606828e4 | 1968 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 1969 | return -EINVAL; |
606828e4 | 1970 | case LTTNG_KERNEL_ABI_CAPTURE: |
ef784b4d | 1971 | return -EINVAL; |
606828e4 | 1972 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
e2d5dbc7 | 1973 | return lttng_event_add_callsite(&event_notifier->parent, |
ef784b4d | 1974 | (struct lttng_kernel_abi_event_callsite __user *) arg); |
dffef45d FD |
1975 | default: |
1976 | return -ENOIOCTLCMD; | |
1977 | } | |
1978 | } | |
1979 | ||
1980 | static | |
ef784b4d | 1981 | long lttng_event_notifier_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1982 | { |
ef784b4d | 1983 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; |
dffef45d | 1984 | |
ef784b4d MD |
1985 | switch (cmd) { |
1986 | case LTTNG_KERNEL_ABI_ENABLE: | |
1987 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
1988 | case LTTNG_KERNEL_ABI_DISABLE: | |
1989 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
1990 | case LTTNG_KERNEL_ABI_FILTER: | |
1991 | return lttng_event_notifier_enabler_attach_filter_bytecode( | |
1992 | event_notifier_enabler, | |
1993 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); | |
1994 | case LTTNG_KERNEL_ABI_CAPTURE: | |
1995 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
1996 | event_notifier_enabler, | |
1997 | (struct lttng_kernel_abi_capture_bytecode __user *) arg); | |
1998 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
1999 | return -EINVAL; | |
dffef45d | 2000 | default: |
ef784b4d | 2001 | return -ENOIOCTLCMD; |
dffef45d | 2002 | } |
ef784b4d | 2003 | } |
dffef45d | 2004 | |
ef784b4d MD |
2005 | static |
2006 | int lttng_event_notifier_event_release(struct inode *inode, struct file *file) | |
2007 | { | |
a67ba386 | 2008 | struct lttng_kernel_event_notifier *event_notifier = file->private_data; |
ef784b4d MD |
2009 | |
2010 | if (event_notifier) | |
a67ba386 | 2011 | fput(event_notifier->priv->group->file); |
dffef45d FD |
2012 | return 0; |
2013 | } | |
2014 | ||
ef784b4d MD |
2015 | static |
2016 | int lttng_event_notifier_enabler_release(struct inode *inode, struct file *file) | |
2017 | { | |
2018 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; | |
2019 | ||
2020 | if (event_notifier_enabler) | |
2021 | fput(event_notifier_enabler->group->file); | |
2022 | return 0; | |
2023 | } | |
2024 | ||
2025 | static const struct file_operations lttng_event_notifier_event_fops = { | |
2026 | .owner = THIS_MODULE, | |
2027 | .release = lttng_event_notifier_event_release, | |
2028 | .unlocked_ioctl = lttng_event_notifier_event_ioctl, | |
2029 | #ifdef CONFIG_COMPAT | |
2030 | .compat_ioctl = lttng_event_notifier_event_ioctl, | |
2031 | #endif | |
2032 | }; | |
2033 | ||
2034 | static const struct file_operations lttng_event_notifier_enabler_fops = { | |
dffef45d | 2035 | .owner = THIS_MODULE, |
ef784b4d MD |
2036 | .release = lttng_event_notifier_enabler_release, |
2037 | .unlocked_ioctl = lttng_event_notifier_enabler_ioctl, | |
dffef45d | 2038 | #ifdef CONFIG_COMPAT |
ef784b4d | 2039 | .compat_ioctl = lttng_event_notifier_enabler_ioctl, |
dffef45d FD |
2040 | #endif |
2041 | }; | |
2042 | ||
2043 | static | |
2044 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
606828e4 | 2045 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2046 | { |
2047 | struct lttng_event_notifier_group *event_notifier_group = | |
2048 | event_notifier_group_file->private_data; | |
ef784b4d | 2049 | const struct file_operations *fops; |
dffef45d FD |
2050 | int event_notifier_fd, ret; |
2051 | struct file *event_notifier_file; | |
2052 | void *priv; | |
2053 | ||
2054 | switch (event_notifier_param->event.instrumentation) { | |
606828e4 MD |
2055 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2056 | case LTTNG_KERNEL_ABI_UPROBE: | |
b01155ba | 2057 | break; |
606828e4 MD |
2058 | case LTTNG_KERNEL_ABI_KPROBE: |
2059 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
2b16f0c9 | 2060 | break; |
606828e4 | 2061 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 | 2062 | break; |
606828e4 | 2063 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9de67196 | 2064 | /* Placing an event notifier on kretprobe is not supported. */ |
606828e4 MD |
2065 | case LTTNG_KERNEL_ABI_FUNCTION: |
2066 | case LTTNG_KERNEL_ABI_NOOP: | |
dffef45d FD |
2067 | default: |
2068 | ret = -EINVAL; | |
2069 | goto inval_instr; | |
2070 | } | |
2071 | ||
ef784b4d | 2072 | switch (event_notifier_param->event.instrumentation) { |
c570be0d MJ |
2073 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2074 | lttng_fallthrough; | |
ef784b4d MD |
2075 | case LTTNG_KERNEL_ABI_SYSCALL: |
2076 | fops = <tng_event_notifier_enabler_fops; | |
2077 | break; | |
c570be0d MJ |
2078 | case LTTNG_KERNEL_ABI_KPROBE: |
2079 | lttng_fallthrough; | |
2080 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
2081 | lttng_fallthrough; | |
ef784b4d MD |
2082 | case LTTNG_KERNEL_ABI_UPROBE: |
2083 | fops = <tng_event_notifier_event_fops; | |
2084 | break; | |
2085 | ||
c570be0d MJ |
2086 | case LTTNG_KERNEL_ABI_FUNCTION: |
2087 | lttng_fallthrough; | |
2088 | case LTTNG_KERNEL_ABI_NOOP: | |
2089 | lttng_fallthrough; | |
ef784b4d MD |
2090 | default: |
2091 | ret = -EINVAL; | |
2092 | goto inval_instr; | |
2093 | } | |
2094 | ||
606828e4 | 2095 | event_notifier_param->event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
dffef45d FD |
2096 | |
2097 | event_notifier_fd = lttng_get_unused_fd(); | |
2098 | if (event_notifier_fd < 0) { | |
2099 | ret = event_notifier_fd; | |
2100 | goto fd_error; | |
2101 | } | |
2102 | ||
2103 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
ef784b4d | 2104 | fops, NULL, O_RDWR); |
dffef45d FD |
2105 | if (IS_ERR(event_notifier_file)) { |
2106 | ret = PTR_ERR(event_notifier_file); | |
2107 | goto file_error; | |
2108 | } | |
2109 | ||
2110 | /* The event notifier holds a reference on the event notifier group. */ | |
2111 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2112 | ret = -EOVERFLOW; | |
2113 | goto refcount_error; | |
2114 | } | |
2115 | ||
56237619 MD |
2116 | ret = lttng_abi_validate_event_param(&event_notifier_param->event); |
2117 | if (ret) | |
2118 | goto event_notifier_error; | |
2119 | ||
684a1e4d | 2120 | switch (event_notifier_param->event.instrumentation) { |
c570be0d MJ |
2121 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2122 | lttng_fallthrough; | |
606828e4 | 2123 | case LTTNG_KERNEL_ABI_SYSCALL: |
684a1e4d | 2124 | { |
dffef45d FD |
2125 | struct lttng_event_notifier_enabler *enabler; |
2126 | ||
2127 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2128 | /* | |
2129 | * If the event name is a star globbing pattern, | |
2130 | * we create the special star globbing enabler. | |
2131 | */ | |
2132 | enabler = lttng_event_notifier_enabler_create( | |
2133 | event_notifier_group, | |
2134 | LTTNG_ENABLER_FORMAT_STAR_GLOB, | |
2135 | event_notifier_param); | |
2136 | } else { | |
2137 | enabler = lttng_event_notifier_enabler_create( | |
2138 | event_notifier_group, | |
2139 | LTTNG_ENABLER_FORMAT_NAME, | |
2140 | event_notifier_param); | |
2141 | } | |
2142 | priv = enabler; | |
684a1e4d MD |
2143 | break; |
2144 | } | |
2145 | ||
c570be0d MJ |
2146 | case LTTNG_KERNEL_ABI_KPROBE: |
2147 | lttng_fallthrough; | |
2148 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
2149 | lttng_fallthrough; | |
606828e4 | 2150 | case LTTNG_KERNEL_ABI_UPROBE: |
684a1e4d | 2151 | { |
a67ba386 | 2152 | struct lttng_kernel_event_notifier *event_notifier; |
dffef45d FD |
2153 | |
2154 | /* | |
2155 | * We tolerate no failure path after event notifier creation. | |
2156 | * It will stay invariant for the rest of the session. | |
2157 | */ | |
2158 | event_notifier = lttng_event_notifier_create(NULL, | |
99f52fcc FD |
2159 | event_notifier_param->event.token, |
2160 | event_notifier_param->error_counter_index, | |
2161 | event_notifier_group, | |
a67ba386 | 2162 | event_notifier_param, |
dffef45d FD |
2163 | event_notifier_param->event.instrumentation); |
2164 | WARN_ON_ONCE(!event_notifier); | |
2165 | if (IS_ERR(event_notifier)) { | |
2166 | ret = PTR_ERR(event_notifier); | |
2167 | goto event_notifier_error; | |
2168 | } | |
2169 | priv = event_notifier; | |
684a1e4d MD |
2170 | break; |
2171 | } | |
2172 | ||
c570be0d MJ |
2173 | case LTTNG_KERNEL_ABI_FUNCTION: |
2174 | lttng_fallthrough; | |
2175 | case LTTNG_KERNEL_ABI_NOOP: | |
2176 | lttng_fallthrough; | |
684a1e4d MD |
2177 | default: |
2178 | ret = -EINVAL; | |
2179 | goto event_notifier_error; | |
dffef45d FD |
2180 | } |
2181 | event_notifier_file->private_data = priv; | |
2182 | fd_install(event_notifier_fd, event_notifier_file); | |
2183 | return event_notifier_fd; | |
2184 | ||
2185 | event_notifier_error: | |
2186 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2187 | refcount_error: | |
2188 | fput(event_notifier_file); | |
2189 | file_error: | |
2190 | put_unused_fd(event_notifier_fd); | |
2191 | fd_error: | |
2192 | inval_instr: | |
2193 | return ret; | |
2194 | } | |
2195 | ||
99f52fcc FD |
2196 | static |
2197 | long lttng_abi_event_notifier_group_create_error_counter( | |
2198 | struct file *event_notifier_group_file, | |
606828e4 | 2199 | const struct lttng_kernel_abi_counter_conf *error_counter_conf) |
99f52fcc FD |
2200 | { |
2201 | int counter_fd, ret; | |
2202 | char *counter_transport_name; | |
2203 | size_t counter_len; | |
2204 | struct lttng_counter *counter = NULL; | |
2205 | struct file *counter_file; | |
2206 | struct lttng_event_notifier_group *event_notifier_group = | |
2207 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2208 | ||
606828e4 | 2209 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR) { |
99f52fcc FD |
2210 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); |
2211 | return -EINVAL; | |
2212 | } | |
2213 | ||
2214 | if (error_counter_conf->number_dimensions != 1) { | |
2215 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2216 | return -EINVAL; | |
2217 | } | |
2218 | ||
2219 | switch (error_counter_conf->bitness) { | |
606828e4 | 2220 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64: |
99f52fcc FD |
2221 | counter_transport_name = "counter-per-cpu-64-modular"; |
2222 | break; | |
606828e4 | 2223 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32: |
99f52fcc FD |
2224 | counter_transport_name = "counter-per-cpu-32-modular"; |
2225 | break; | |
2226 | default: | |
2227 | return -EINVAL; | |
2228 | } | |
2229 | ||
2230 | /* | |
2231 | * Lock sessions to provide mutual exclusion against concurrent | |
2232 | * modification of event_notifier group, which would result in | |
2233 | * overwriting the error counter if set concurrently. | |
2234 | */ | |
2235 | lttng_lock_sessions(); | |
2236 | ||
2237 | if (event_notifier_group->error_counter) { | |
2238 | printk(KERN_ERR "Error counter already created in event_notifier group\n"); | |
2239 | ret = -EBUSY; | |
2240 | goto fd_error; | |
2241 | } | |
2242 | ||
2243 | counter_fd = lttng_get_unused_fd(); | |
2244 | if (counter_fd < 0) { | |
2245 | ret = counter_fd; | |
2246 | goto fd_error; | |
2247 | } | |
2248 | ||
2249 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2250 | <tng_counter_fops, | |
2251 | NULL, O_RDONLY); | |
2252 | if (IS_ERR(counter_file)) { | |
2253 | ret = PTR_ERR(counter_file); | |
2254 | goto file_error; | |
2255 | } | |
2256 | ||
2257 | counter_len = error_counter_conf->dimensions[0].size; | |
2258 | ||
2259 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2260 | ret = -EOVERFLOW; | |
2261 | goto refcount_error; | |
2262 | } | |
2263 | ||
2264 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2265 | 1, &counter_len); | |
2266 | if (!counter) { | |
2267 | ret = -EINVAL; | |
2268 | goto counter_error; | |
2269 | } | |
2270 | ||
99f52fcc | 2271 | event_notifier_group->error_counter_len = counter_len; |
ab04d7b1 MD |
2272 | /* |
2273 | * store-release to publish error counter matches load-acquire | |
2274 | * in record_error. Ensures the counter is created and the | |
2275 | * error_counter_len is set before they are used. | |
2276 | */ | |
6657edec | 2277 | lttng_smp_store_release(&event_notifier_group->error_counter, counter); |
99f52fcc FD |
2278 | |
2279 | counter->file = counter_file; | |
2280 | counter->owner = event_notifier_group->file; | |
2281 | counter_file->private_data = counter; | |
2282 | /* Ownership transferred. */ | |
2283 | counter = NULL; | |
2284 | ||
2285 | fd_install(counter_fd, counter_file); | |
2286 | lttng_unlock_sessions(); | |
2287 | ||
2288 | return counter_fd; | |
2289 | ||
2290 | counter_error: | |
2291 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2292 | refcount_error: | |
2293 | fput(counter_file); | |
2294 | file_error: | |
2295 | put_unused_fd(counter_fd); | |
2296 | fd_error: | |
2297 | lttng_unlock_sessions(); | |
2298 | return ret; | |
2299 | } | |
2300 | ||
750b05f2 FD |
2301 | static |
2302 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2303 | unsigned long arg) | |
2304 | { | |
2305 | switch (cmd) { | |
606828e4 | 2306 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
21f58fb7 FD |
2307 | { |
2308 | return lttng_abi_open_event_notifier_group_stream(file); | |
2309 | } | |
606828e4 | 2310 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE: |
dffef45d | 2311 | { |
606828e4 | 2312 | struct lttng_kernel_abi_event_notifier uevent_notifier_param; |
dffef45d FD |
2313 | |
2314 | if (copy_from_user(&uevent_notifier_param, | |
606828e4 | 2315 | (struct lttng_kernel_abi_event_notifier __user *) arg, |
dffef45d FD |
2316 | sizeof(uevent_notifier_param))) |
2317 | return -EFAULT; | |
2318 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2319 | } | |
606828e4 | 2320 | case LTTNG_KERNEL_ABI_COUNTER: |
99f52fcc | 2321 | { |
606828e4 | 2322 | struct lttng_kernel_abi_counter_conf uerror_counter_conf; |
99f52fcc FD |
2323 | |
2324 | if (copy_from_user(&uerror_counter_conf, | |
606828e4 | 2325 | (struct lttng_kernel_abi_counter_conf __user *) arg, |
99f52fcc FD |
2326 | sizeof(uerror_counter_conf))) |
2327 | return -EFAULT; | |
2328 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2329 | &uerror_counter_conf); | |
2330 | } | |
750b05f2 FD |
2331 | default: |
2332 | return -ENOIOCTLCMD; | |
2333 | } | |
2334 | return 0; | |
2335 | } | |
2336 | ||
2337 | static | |
2338 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2339 | { | |
2340 | struct lttng_event_notifier_group *event_notifier_group = | |
2341 | file->private_data; | |
2342 | ||
2343 | if (event_notifier_group) | |
2344 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2345 | return 0; | |
2346 | } | |
2347 | ||
2348 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2349 | .owner = THIS_MODULE, | |
2350 | .release = lttng_event_notifier_group_release, | |
2351 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2352 | #ifdef CONFIG_COMPAT | |
2353 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2354 | #endif | |
2355 | }; | |
2356 | ||
ad1c05e1 MD |
2357 | /** |
2358 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2359 | * | |
c0e31d2e | 2360 | * @file: the file |
ad1c05e1 MD |
2361 | * @cmd: the command |
2362 | * @arg: command arg | |
2363 | * | |
2364 | * This ioctl implements lttng commands: | |
606828e4 | 2365 | * LTTNG_KERNEL_ABI_STREAM |
ad1c05e1 MD |
2366 | * Returns an event stream file descriptor or failure. |
2367 | * (typically, one event stream records events from one CPU) | |
606828e4 | 2368 | * LTTNG_KERNEL_ABI_EVENT |
ad1c05e1 | 2369 | * Returns an event file descriptor or failure. |
606828e4 | 2370 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2371 | * Prepend a context field to each event in the channel |
606828e4 | 2372 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2373 | * Enable recording for events in this channel (weak enable) |
606828e4 | 2374 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2375 | * Disable recording for events in this channel (strong disable) |
baf20995 | 2376 | * |
baf20995 MD |
2377 | * Channel and event file descriptors also hold a reference on the session. |
2378 | */ | |
ad1c05e1 | 2379 | static |
c0e31d2e | 2380 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2381 | { |
ac847066 | 2382 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
8070f5c0 | 2383 | |
baf20995 | 2384 | switch (cmd) { |
606828e4 MD |
2385 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2386 | case LTTNG_KERNEL_ABI_STREAM: | |
c0e31d2e | 2387 | return lttng_abi_open_stream(file); |
606828e4 | 2388 | case LTTNG_KERNEL_ABI_OLD_EVENT: |
6dccd6c1 | 2389 | { |
606828e4 MD |
2390 | struct lttng_kernel_abi_event *uevent_param; |
2391 | struct lttng_kernel_abi_old_event *old_uevent_param; | |
6dccd6c1 JD |
2392 | int ret; |
2393 | ||
606828e4 | 2394 | uevent_param = kmalloc(sizeof(struct lttng_kernel_abi_event), |
6dccd6c1 JD |
2395 | GFP_KERNEL); |
2396 | if (!uevent_param) { | |
2397 | ret = -ENOMEM; | |
2398 | goto old_event_end; | |
2399 | } | |
2400 | old_uevent_param = kmalloc( | |
606828e4 | 2401 | sizeof(struct lttng_kernel_abi_old_event), |
6dccd6c1 JD |
2402 | GFP_KERNEL); |
2403 | if (!old_uevent_param) { | |
2404 | ret = -ENOMEM; | |
2405 | goto old_event_error_free_param; | |
2406 | } | |
2407 | if (copy_from_user(old_uevent_param, | |
606828e4 MD |
2408 | (struct lttng_kernel_abi_old_event __user *) arg, |
2409 | sizeof(struct lttng_kernel_abi_old_event))) { | |
6dccd6c1 JD |
2410 | ret = -EFAULT; |
2411 | goto old_event_error_free_old_param; | |
2412 | } | |
2413 | ||
2414 | memcpy(uevent_param->name, old_uevent_param->name, | |
2415 | sizeof(uevent_param->name)); | |
2416 | uevent_param->instrumentation = | |
2417 | old_uevent_param->instrumentation; | |
2418 | ||
2419 | switch (old_uevent_param->instrumentation) { | |
606828e4 | 2420 | case LTTNG_KERNEL_ABI_KPROBE: |
6dccd6c1 JD |
2421 | uevent_param->u.kprobe.addr = |
2422 | old_uevent_param->u.kprobe.addr; | |
2423 | uevent_param->u.kprobe.offset = | |
2424 | old_uevent_param->u.kprobe.offset; | |
2425 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2426 | old_uevent_param->u.kprobe.symbol_name, | |
2427 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2428 | break; | |
606828e4 | 2429 | case LTTNG_KERNEL_ABI_KRETPROBE: |
6dccd6c1 JD |
2430 | uevent_param->u.kretprobe.addr = |
2431 | old_uevent_param->u.kretprobe.addr; | |
2432 | uevent_param->u.kretprobe.offset = | |
2433 | old_uevent_param->u.kretprobe.offset; | |
2434 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2435 | old_uevent_param->u.kretprobe.symbol_name, | |
2436 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2437 | break; | |
606828e4 | 2438 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
2439 | WARN_ON_ONCE(1); |
2440 | /* Not implemented. */ | |
6dccd6c1 JD |
2441 | break; |
2442 | default: | |
2443 | break; | |
2444 | } | |
2445 | ret = lttng_abi_create_event(file, uevent_param); | |
2446 | ||
2447 | old_event_error_free_old_param: | |
2448 | kfree(old_uevent_param); | |
2449 | old_event_error_free_param: | |
2450 | kfree(uevent_param); | |
2451 | old_event_end: | |
2452 | return ret; | |
2453 | } | |
606828e4 | 2454 | case LTTNG_KERNEL_ABI_EVENT: |
6dccd6c1 | 2455 | { |
606828e4 | 2456 | struct lttng_kernel_abi_event uevent_param; |
6dccd6c1 JD |
2457 | |
2458 | if (copy_from_user(&uevent_param, | |
606828e4 | 2459 | (struct lttng_kernel_abi_event __user *) arg, |
6dccd6c1 JD |
2460 | sizeof(uevent_param))) |
2461 | return -EFAULT; | |
2462 | return lttng_abi_create_event(file, &uevent_param); | |
2463 | } | |
606828e4 | 2464 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2465 | { |
606828e4 MD |
2466 | struct lttng_kernel_abi_context *ucontext_param; |
2467 | struct lttng_kernel_abi_old_context *old_ucontext_param; | |
6dccd6c1 JD |
2468 | int ret; |
2469 | ||
606828e4 | 2470 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_context), |
6dccd6c1 JD |
2471 | GFP_KERNEL); |
2472 | if (!ucontext_param) { | |
2473 | ret = -ENOMEM; | |
2474 | goto old_ctx_end; | |
2475 | } | |
606828e4 | 2476 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_old_context), |
6dccd6c1 JD |
2477 | GFP_KERNEL); |
2478 | if (!old_ucontext_param) { | |
2479 | ret = -ENOMEM; | |
2480 | goto old_ctx_error_free_param; | |
2481 | } | |
2482 | ||
2483 | if (copy_from_user(old_ucontext_param, | |
606828e4 MD |
2484 | (struct lttng_kernel_abi_old_context __user *) arg, |
2485 | sizeof(struct lttng_kernel_abi_old_context))) { | |
6dccd6c1 JD |
2486 | ret = -EFAULT; |
2487 | goto old_ctx_error_free_old_param; | |
2488 | } | |
2489 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2490 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2491 | sizeof(ucontext_param->padding)); | |
2492 | /* only type that uses the union */ | |
606828e4 | 2493 | if (old_ucontext_param->ctx == LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER) { |
6dccd6c1 JD |
2494 | ucontext_param->u.perf_counter.type = |
2495 | old_ucontext_param->u.perf_counter.type; | |
2496 | ucontext_param->u.perf_counter.config = | |
2497 | old_ucontext_param->u.perf_counter.config; | |
2498 | memcpy(ucontext_param->u.perf_counter.name, | |
2499 | old_ucontext_param->u.perf_counter.name, | |
2500 | sizeof(ucontext_param->u.perf_counter.name)); | |
2501 | } | |
2502 | ||
2503 | ret = lttng_abi_add_context(file, | |
2504 | ucontext_param, | |
ac847066 | 2505 | &channel->priv->ctx, channel->parent.session); |
6dccd6c1 JD |
2506 | |
2507 | old_ctx_error_free_old_param: | |
2508 | kfree(old_ucontext_param); | |
2509 | old_ctx_error_free_param: | |
2510 | kfree(ucontext_param); | |
2511 | old_ctx_end: | |
2512 | return ret; | |
2513 | } | |
606828e4 | 2514 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2515 | { |
606828e4 | 2516 | struct lttng_kernel_abi_context ucontext_param; |
6dccd6c1 JD |
2517 | |
2518 | if (copy_from_user(&ucontext_param, | |
606828e4 | 2519 | (struct lttng_kernel_abi_context __user *) arg, |
6dccd6c1 JD |
2520 | sizeof(ucontext_param))) |
2521 | return -EFAULT; | |
2522 | return lttng_abi_add_context(file, | |
2523 | &ucontext_param, | |
ac847066 | 2524 | &channel->priv->ctx, channel->parent.session); |
6dccd6c1 | 2525 | } |
606828e4 MD |
2526 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2527 | case LTTNG_KERNEL_ABI_ENABLE: | |
a90917c3 | 2528 | return lttng_channel_enable(channel); |
606828e4 MD |
2529 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2530 | case LTTNG_KERNEL_ABI_DISABLE: | |
a90917c3 | 2531 | return lttng_channel_disable(channel); |
606828e4 | 2532 | case LTTNG_KERNEL_ABI_SYSCALL_MASK: |
12e579db | 2533 | return lttng_channel_syscall_mask(channel, |
606828e4 | 2534 | (struct lttng_kernel_abi_syscall_mask __user *) arg); |
baf20995 MD |
2535 | default: |
2536 | return -ENOIOCTLCMD; | |
2537 | } | |
2538 | } | |
2539 | ||
5dbbdb43 MD |
2540 | /** |
2541 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2542 | * | |
2543 | * @file: the file | |
2544 | * @cmd: the command | |
2545 | * @arg: command arg | |
2546 | * | |
2547 | * This ioctl implements lttng commands: | |
606828e4 | 2548 | * LTTNG_KERNEL_ABI_STREAM |
5dbbdb43 MD |
2549 | * Returns an event stream file descriptor or failure. |
2550 | * | |
2551 | * Channel and event file descriptors also hold a reference on the session. | |
2552 | */ | |
2553 | static | |
2554 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2555 | { | |
2556 | switch (cmd) { | |
606828e4 MD |
2557 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2558 | case LTTNG_KERNEL_ABI_STREAM: | |
d83004aa | 2559 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2560 | default: |
2561 | return -ENOIOCTLCMD; | |
2562 | } | |
2563 | } | |
2564 | ||
653fe716 MD |
2565 | /** |
2566 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2567 | * | |
c0e31d2e | 2568 | * @file: the file |
653fe716 MD |
2569 | * @wait: poll table |
2570 | */ | |
c0e31d2e | 2571 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2572 | { |
ac847066 | 2573 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
653fe716 MD |
2574 | unsigned int mask = 0; |
2575 | ||
c0e31d2e | 2576 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2577 | poll_wait_set_exclusive(wait); |
ac847066 | 2578 | poll_wait(file, channel->ops->priv->get_hp_wait_queue(channel->priv->rb_chan), |
24cedcfe | 2579 | wait); |
653fe716 | 2580 | |
ac847066 | 2581 | if (channel->ops->priv->is_disabled(channel->priv->rb_chan)) |
254ec7bc | 2582 | return POLLERR; |
ac847066 | 2583 | if (channel->ops->priv->is_finalized(channel->priv->rb_chan)) |
653fe716 | 2584 | return POLLHUP; |
ac847066 | 2585 | if (channel->ops->priv->buffer_has_read_closed_stream(channel->priv->rb_chan)) |
653fe716 | 2586 | return POLLIN | POLLRDNORM; |
f71ecafa | 2587 | return 0; |
653fe716 MD |
2588 | } |
2589 | return mask; | |
2590 | ||
2591 | } | |
2592 | ||
0a84a57f MD |
2593 | static |
2594 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2595 | { | |
ac847066 | 2596 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
c269fff4 MD |
2597 | |
2598 | if (channel) | |
ac847066 | 2599 | fput(channel->parent.session->priv->file); |
0a84a57f MD |
2600 | return 0; |
2601 | } | |
2602 | ||
d83004aa JD |
2603 | static |
2604 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2605 | { | |
ac847066 | 2606 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
d83004aa JD |
2607 | |
2608 | if (channel) { | |
ac847066 | 2609 | fput(channel->parent.session->priv->file); |
a3381417 | 2610 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2611 | } |
2612 | ||
2613 | return 0; | |
2614 | } | |
2615 | ||
ad1c05e1 | 2616 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2617 | .owner = THIS_MODULE, |
03037b98 | 2618 | .release = lttng_channel_release, |
653fe716 | 2619 | .poll = lttng_channel_poll, |
ad1c05e1 | 2620 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2621 | #ifdef CONFIG_COMPAT |
03037b98 | 2622 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2623 | #endif |
11b5a3c2 | 2624 | }; |
baf20995 | 2625 | |
5dbbdb43 | 2626 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2627 | .owner = THIS_MODULE, |
d83004aa | 2628 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2629 | .unlocked_ioctl = lttng_metadata_ioctl, |
2630 | #ifdef CONFIG_COMPAT | |
2631 | .compat_ioctl = lttng_metadata_ioctl, | |
2632 | #endif | |
2633 | }; | |
2634 | ||
8070f5c0 | 2635 | /** |
ef784b4d | 2636 | * lttng_event_recorder_event_ioctl - lttng syscall through ioctl |
8070f5c0 MD |
2637 | * |
2638 | * @file: the file | |
2639 | * @cmd: the command | |
2640 | * @arg: command arg | |
2641 | * | |
2642 | * This ioctl implements lttng commands: | |
606828e4 | 2643 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2644 | * Prepend a context field to each record of this event |
606828e4 | 2645 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2646 | * Enable recording for this event (weak enable) |
606828e4 | 2647 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2648 | * Disable recording for this event (strong disable) |
8070f5c0 MD |
2649 | */ |
2650 | static | |
ef784b4d | 2651 | long lttng_event_recorder_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
8070f5c0 | 2652 | { |
e2d5dbc7 | 2653 | struct lttng_kernel_event_recorder *event_recorder = file->private_data; |
8070f5c0 MD |
2654 | |
2655 | switch (cmd) { | |
606828e4 | 2656 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2657 | { |
3c997079 MD |
2658 | /* Not implemented */ |
2659 | return -ENOSYS; | |
6dccd6c1 | 2660 | } |
606828e4 | 2661 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2662 | { |
3c997079 MD |
2663 | /* Not implemented */ |
2664 | return -ENOSYS; | |
6dccd6c1 | 2665 | } |
606828e4 MD |
2666 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2667 | case LTTNG_KERNEL_ABI_ENABLE: | |
9d993668 | 2668 | return lttng_event_enable(&event_recorder->parent); |
606828e4 MD |
2669 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2670 | case LTTNG_KERNEL_ABI_DISABLE: | |
9d993668 | 2671 | return lttng_event_disable(&event_recorder->parent); |
606828e4 | 2672 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 2673 | return -EINVAL; |
606828e4 | 2674 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
e2d5dbc7 | 2675 | return lttng_event_add_callsite(&event_recorder->parent, |
ef784b4d | 2676 | (struct lttng_kernel_abi_event_callsite __user *) arg); |
8070f5c0 MD |
2677 | default: |
2678 | return -ENOIOCTLCMD; | |
2679 | } | |
2680 | } | |
2681 | ||
ef784b4d MD |
2682 | /** |
2683 | * lttng_event_recorder_enabler_ioctl - lttng syscall through ioctl | |
2684 | * | |
2685 | * @file: the file | |
2686 | * @cmd: the command | |
2687 | * @arg: command arg | |
2688 | * | |
2689 | * This ioctl implements lttng commands: | |
2690 | * LTTNG_KERNEL_ABI_CONTEXT | |
2691 | * Prepend a context field to each record of this event | |
2692 | * LTTNG_KERNEL_ABI_ENABLE | |
2693 | * Enable recording for this event (weak enable) | |
2694 | * LTTNG_KERNEL_ABI_DISABLE | |
2695 | * Disable recording for this event (strong disable) | |
2696 | */ | |
0a84a57f | 2697 | static |
ef784b4d | 2698 | long lttng_event_recorder_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
0a84a57f | 2699 | { |
ef784b4d | 2700 | struct lttng_event_enabler *event_enabler = file->private_data; |
3c997079 | 2701 | |
ef784b4d MD |
2702 | switch (cmd) { |
2703 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: | |
2704 | { | |
2705 | /* Not implemented */ | |
2706 | return -ENOSYS; | |
2707 | } | |
2708 | case LTTNG_KERNEL_ABI_CONTEXT: | |
2709 | { | |
2710 | /* Not implemented */ | |
2711 | return -ENOSYS; | |
2712 | } | |
2713 | case LTTNG_KERNEL_ABI_OLD_ENABLE: | |
2714 | case LTTNG_KERNEL_ABI_ENABLE: | |
2715 | return lttng_event_enabler_enable(event_enabler); | |
2716 | case LTTNG_KERNEL_ABI_OLD_DISABLE: | |
2717 | case LTTNG_KERNEL_ABI_DISABLE: | |
2718 | return lttng_event_enabler_disable(event_enabler); | |
2719 | case LTTNG_KERNEL_ABI_FILTER: | |
2720 | return lttng_event_enabler_attach_filter_bytecode( | |
2721 | event_enabler, | |
2722 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); | |
2723 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
2724 | return -EINVAL; | |
3c997079 | 2725 | default: |
ef784b4d | 2726 | return -ENOIOCTLCMD; |
3c997079 | 2727 | } |
ef784b4d MD |
2728 | } |
2729 | ||
2730 | static | |
2731 | int lttng_event_recorder_event_release(struct inode *inode, struct file *file) | |
2732 | { | |
a67ba386 | 2733 | struct lttng_kernel_event_recorder *event = file->private_data; |
ef784b4d MD |
2734 | |
2735 | if (event) | |
ac847066 | 2736 | fput(event->chan->priv->parent.file); |
ef784b4d MD |
2737 | return 0; |
2738 | } | |
c269fff4 | 2739 | |
ef784b4d MD |
2740 | static |
2741 | int lttng_event_recorder_enabler_release(struct inode *inode, struct file *file) | |
2742 | { | |
2743 | struct lttng_event_enabler *event_enabler = file->private_data; | |
2744 | ||
2745 | if (event_enabler) | |
ac847066 | 2746 | fput(event_enabler->chan->priv->parent.file); |
0a84a57f MD |
2747 | return 0; |
2748 | } | |
2749 | ||
ef784b4d MD |
2750 | static const struct file_operations lttng_event_recorder_event_fops = { |
2751 | .owner = THIS_MODULE, | |
2752 | .release = lttng_event_recorder_event_release, | |
2753 | .unlocked_ioctl = lttng_event_recorder_event_ioctl, | |
2754 | #ifdef CONFIG_COMPAT | |
2755 | .compat_ioctl = lttng_event_recorder_event_ioctl, | |
2756 | #endif | |
2757 | }; | |
2758 | ||
2759 | static const struct file_operations lttng_event_recorder_enabler_fops = { | |
a33c9927 | 2760 | .owner = THIS_MODULE, |
ef784b4d MD |
2761 | .release = lttng_event_recorder_enabler_release, |
2762 | .unlocked_ioctl = lttng_event_recorder_enabler_ioctl, | |
8070f5c0 | 2763 | #ifdef CONFIG_COMPAT |
ef784b4d | 2764 | .compat_ioctl = lttng_event_recorder_enabler_ioctl, |
8070f5c0 | 2765 | #endif |
11b5a3c2 | 2766 | }; |
0a84a57f | 2767 | |
3b731ab1 JD |
2768 | static int put_u64(uint64_t val, unsigned long arg) |
2769 | { | |
2770 | return put_user(val, (uint64_t __user *) arg); | |
2771 | } | |
2772 | ||
8b97fd42 MD |
2773 | static int put_u32(uint32_t val, unsigned long arg) |
2774 | { | |
2775 | return put_user(val, (uint32_t __user *) arg); | |
2776 | } | |
2777 | ||
ed8d02d6 JD |
2778 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2779 | unsigned int cmd, unsigned long arg) | |
2780 | { | |
a2a1b5ab | 2781 | struct lttng_kernel_ring_buffer *buf = filp->private_data; |
4071a628 | 2782 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
a2a1b5ab | 2783 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; |
da1fe18f | 2784 | const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2785 | int ret; |
2786 | ||
2787 | if (atomic_read(&chan->record_disabled)) | |
2788 | return -EIO; | |
2789 | ||
ed8d02d6 | 2790 | switch (cmd) { |
606828e4 | 2791 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2792 | { |
2793 | uint64_t ts; | |
2794 | ||
da1fe18f | 2795 | ret = ops->priv->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2796 | if (ret < 0) |
2797 | goto error; | |
2798 | return put_u64(ts, arg); | |
2799 | } | |
606828e4 | 2800 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END: |
3b731ab1 JD |
2801 | { |
2802 | uint64_t ts; | |
2803 | ||
da1fe18f | 2804 | ret = ops->priv->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2805 | if (ret < 0) |
2806 | goto error; | |
2807 | return put_u64(ts, arg); | |
2808 | } | |
606828e4 | 2809 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2810 | { |
2811 | uint64_t ed; | |
2812 | ||
da1fe18f | 2813 | ret = ops->priv->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2814 | if (ret < 0) |
2815 | goto error; | |
2816 | return put_u64(ed, arg); | |
2817 | } | |
606828e4 | 2818 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE: |
3b731ab1 JD |
2819 | { |
2820 | uint64_t cs; | |
2821 | ||
da1fe18f | 2822 | ret = ops->priv->content_size(config, buf, &cs); |
3b731ab1 JD |
2823 | if (ret < 0) |
2824 | goto error; | |
2825 | return put_u64(cs, arg); | |
2826 | } | |
606828e4 | 2827 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE: |
3b731ab1 JD |
2828 | { |
2829 | uint64_t ps; | |
2830 | ||
da1fe18f | 2831 | ret = ops->priv->packet_size(config, buf, &ps); |
3b731ab1 JD |
2832 | if (ret < 0) |
2833 | goto error; | |
2834 | return put_u64(ps, arg); | |
2835 | } | |
606828e4 | 2836 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID: |
3b731ab1 JD |
2837 | { |
2838 | uint64_t si; | |
2839 | ||
da1fe18f | 2840 | ret = ops->priv->stream_id(config, buf, &si); |
3b731ab1 JD |
2841 | if (ret < 0) |
2842 | goto error; | |
2843 | return put_u64(si, arg); | |
2844 | } | |
606828e4 | 2845 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2846 | { |
2847 | uint64_t ts; | |
2848 | ||
da1fe18f | 2849 | ret = ops->priv->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2850 | if (ret < 0) |
2851 | goto error; | |
2852 | return put_u64(ts, arg); | |
2853 | } | |
606828e4 | 2854 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM: |
5b3cf4f9 JD |
2855 | { |
2856 | uint64_t seq; | |
2857 | ||
da1fe18f | 2858 | ret = ops->priv->sequence_number(config, buf, &seq); |
5b3cf4f9 JD |
2859 | if (ret < 0) |
2860 | goto error; | |
2861 | return put_u64(seq, arg); | |
2862 | } | |
606828e4 | 2863 | case LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID: |
5594698f JD |
2864 | { |
2865 | uint64_t id; | |
2866 | ||
da1fe18f | 2867 | ret = ops->priv->instance_id(config, buf, &id); |
5594698f JD |
2868 | if (ret < 0) |
2869 | goto error; | |
2870 | return put_u64(id, arg); | |
2871 | } | |
3b731ab1 JD |
2872 | default: |
2873 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2874 | cmd, arg); | |
ed8d02d6 | 2875 | } |
3b731ab1 JD |
2876 | |
2877 | error: | |
2878 | return -ENOSYS; | |
ed8d02d6 JD |
2879 | } |
2880 | ||
2881 | #ifdef CONFIG_COMPAT | |
2882 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2883 | unsigned int cmd, unsigned long arg) | |
2884 | { | |
a2a1b5ab | 2885 | struct lttng_kernel_ring_buffer *buf = filp->private_data; |
4071a628 | 2886 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
a2a1b5ab | 2887 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; |
da1fe18f | 2888 | const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2889 | int ret; |
2890 | ||
2891 | if (atomic_read(&chan->record_disabled)) | |
2892 | return -EIO; | |
2893 | ||
ed8d02d6 | 2894 | switch (cmd) { |
606828e4 | 2895 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2896 | { |
2897 | uint64_t ts; | |
2898 | ||
da1fe18f | 2899 | ret = ops->priv->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2900 | if (ret < 0) |
2901 | goto error; | |
2902 | return put_u64(ts, arg); | |
2903 | } | |
606828e4 | 2904 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: |
3b731ab1 JD |
2905 | { |
2906 | uint64_t ts; | |
2907 | ||
da1fe18f | 2908 | ret = ops->priv->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2909 | if (ret < 0) |
2910 | goto error; | |
2911 | return put_u64(ts, arg); | |
2912 | } | |
606828e4 | 2913 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2914 | { |
2915 | uint64_t ed; | |
2916 | ||
da1fe18f | 2917 | ret = ops->priv->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2918 | if (ret < 0) |
2919 | goto error; | |
2920 | return put_u64(ed, arg); | |
ed8d02d6 | 2921 | } |
606828e4 | 2922 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
3b731ab1 JD |
2923 | { |
2924 | uint64_t cs; | |
2925 | ||
da1fe18f | 2926 | ret = ops->priv->content_size(config, buf, &cs); |
3b731ab1 JD |
2927 | if (ret < 0) |
2928 | goto error; | |
2929 | return put_u64(cs, arg); | |
2930 | } | |
606828e4 | 2931 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_PACKET_SIZE: |
3b731ab1 JD |
2932 | { |
2933 | uint64_t ps; | |
2934 | ||
da1fe18f | 2935 | ret = ops->priv->packet_size(config, buf, &ps); |
3b731ab1 JD |
2936 | if (ret < 0) |
2937 | goto error; | |
2938 | return put_u64(ps, arg); | |
2939 | } | |
606828e4 | 2940 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_STREAM_ID: |
3b731ab1 JD |
2941 | { |
2942 | uint64_t si; | |
2943 | ||
da1fe18f | 2944 | ret = ops->priv->stream_id(config, buf, &si); |
3b731ab1 JD |
2945 | if (ret < 0) |
2946 | goto error; | |
2947 | return put_u64(si, arg); | |
2948 | } | |
606828e4 | 2949 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2950 | { |
2951 | uint64_t ts; | |
2952 | ||
da1fe18f | 2953 | ret = ops->priv->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2954 | if (ret < 0) |
2955 | goto error; | |
2956 | return put_u64(ts, arg); | |
2957 | } | |
606828e4 | 2958 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
5b3cf4f9 JD |
2959 | { |
2960 | uint64_t seq; | |
2961 | ||
da1fe18f | 2962 | ret = ops->priv->sequence_number(config, buf, &seq); |
5b3cf4f9 JD |
2963 | if (ret < 0) |
2964 | goto error; | |
2965 | return put_u64(seq, arg); | |
2966 | } | |
606828e4 | 2967 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_INSTANCE_ID: |
5594698f JD |
2968 | { |
2969 | uint64_t id; | |
2970 | ||
da1fe18f | 2971 | ret = ops->priv->instance_id(config, buf, &id); |
5594698f JD |
2972 | if (ret < 0) |
2973 | goto error; | |
2974 | return put_u64(id, arg); | |
2975 | } | |
3b731ab1 JD |
2976 | default: |
2977 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2978 | cmd, arg); | |
2979 | } | |
2980 | ||
2981 | error: | |
2982 | return -ENOSYS; | |
ed8d02d6 JD |
2983 | } |
2984 | #endif /* CONFIG_COMPAT */ | |
2985 | ||
2986 | static void lttng_stream_override_ring_buffer_fops(void) | |
2987 | { | |
2988 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2989 | lttng_stream_ring_buffer_file_operations.open = | |
2990 | lib_ring_buffer_file_operations.open; | |
2991 | lttng_stream_ring_buffer_file_operations.release = | |
2992 | lib_ring_buffer_file_operations.release; | |
2993 | lttng_stream_ring_buffer_file_operations.poll = | |
2994 | lib_ring_buffer_file_operations.poll; | |
2995 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2996 | lib_ring_buffer_file_operations.splice_read; | |
2997 | lttng_stream_ring_buffer_file_operations.mmap = | |
2998 | lib_ring_buffer_file_operations.mmap; | |
2999 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
3000 | lttng_stream_ring_buffer_ioctl; | |
3001 | lttng_stream_ring_buffer_file_operations.llseek = | |
3002 | lib_ring_buffer_file_operations.llseek; | |
3003 | #ifdef CONFIG_COMPAT | |
3004 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
3005 | lttng_stream_ring_buffer_compat_ioctl; | |
3006 | #endif | |
3007 | } | |
3008 | ||
80996790 | 3009 | int __init lttng_abi_init(void) |
baf20995 MD |
3010 | { |
3011 | int ret = 0; | |
3012 | ||
263b6c88 | 3013 | wrapper_vmalloc_sync_mappings(); |
2754583e | 3014 | lttng_clock_ref(); |
f771eda6 JD |
3015 | |
3016 | ret = lttng_tp_mempool_init(); | |
3017 | if (ret) { | |
3018 | goto error; | |
3019 | } | |
3020 | ||
d29348f7 | 3021 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 3022 | <tng_proc_ops, NULL); |
2470a237 | 3023 | |
255e52a4 | 3024 | if (!lttng_proc_dentry) { |
5a15f70c | 3025 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
3026 | ret = -ENOMEM; |
3027 | goto error; | |
3028 | } | |
ed8d02d6 | 3029 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 3030 | return 0; |
ed8d02d6 | 3031 | |
baf20995 | 3032 | error: |
f771eda6 | 3033 | lttng_tp_mempool_destroy(); |
2754583e | 3034 | lttng_clock_unref(); |
baf20995 MD |
3035 | return ret; |
3036 | } | |
3037 | ||
e6e65fcd MD |
3038 | /* No __exit annotation because used by init error path too. */ |
3039 | void lttng_abi_exit(void) | |
baf20995 | 3040 | { |
f771eda6 | 3041 | lttng_tp_mempool_destroy(); |
2754583e | 3042 | lttng_clock_unref(); |
e6a17f26 MD |
3043 | if (lttng_proc_dentry) |
3044 | remove_proc_entry("lttng", NULL); | |
baf20995 | 3045 | } |