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 | ||
a27c8df7 | 26 | #include <asm/barrier.h> |
11b5a3c2 | 27 | #include <linux/module.h> |
e6a17f26 | 28 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
29 | #include <linux/anon_inodes.h> |
30 | #include <linux/file.h> | |
31 | #include <linux/uaccess.h> | |
32 | #include <linux/slab.h> | |
abc0446a | 33 | #include <linux/err.h> |
263b6c88 | 34 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
24591303 MD |
35 | #include <ringbuffer/vfs.h> |
36 | #include <ringbuffer/backend.h> | |
37 | #include <ringbuffer/frontend.h> | |
c190d76e | 38 | #include <wrapper/compiler_attributes.h> |
241ae9a8 | 39 | #include <wrapper/poll.h> |
241ae9a8 | 40 | #include <wrapper/kref.h> |
2df37e95 MD |
41 | #include <lttng/string-utils.h> |
42 | #include <lttng/abi.h> | |
43 | #include <lttng/abi-old.h> | |
44 | #include <lttng/events.h> | |
92bc1e23 | 45 | #include <lttng/events-internal.h> |
2df37e95 MD |
46 | #include <lttng/tracer.h> |
47 | #include <lttng/tp-mempool.h> | |
24591303 | 48 | #include <ringbuffer/frontend_types.h> |
db2511b4 | 49 | #include <ringbuffer/iterator.h> |
baf20995 MD |
50 | |
51 | /* | |
52 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 53 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
54 | */ |
55 | ||
e6a17f26 | 56 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 | 57 | |
5f4c791e | 58 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
59 | static const struct proc_ops lttng_proc_ops; |
60 | #else | |
61 | static const struct file_operations lttng_proc_ops; | |
62 | #endif | |
63 | ||
ad1c05e1 | 64 | static const struct file_operations lttng_session_fops; |
750b05f2 | 65 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 66 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 67 | static const struct file_operations lttng_metadata_fops; |
ef784b4d MD |
68 | static const struct file_operations lttng_event_recorder_event_fops; |
69 | static const struct file_operations lttng_event_recorder_enabler_fops; | |
ed8d02d6 | 70 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 71 | |
9616f0bf | 72 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 73 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 74 | |
99f52fcc FD |
75 | static int validate_zeroed_padding(char *p, size_t len) |
76 | { | |
77 | size_t i; | |
78 | ||
79 | for (i = 0; i < len; i++) { | |
80 | if (p[i]) | |
81 | return -1; | |
82 | } | |
83 | return 0; | |
84 | } | |
85 | ||
a33c9927 MD |
86 | /* |
87 | * Teardown management: opened file descriptors keep a refcount on the module, | |
88 | * so it can only exit when all file descriptors are closed. | |
89 | */ | |
90 | ||
ad1c05e1 | 91 | static |
baf20995 MD |
92 | int lttng_abi_create_session(void) |
93 | { | |
8cdc1a81 | 94 | struct lttng_kernel_session *session; |
c0e31d2e | 95 | struct file *session_file; |
11b5a3c2 | 96 | int session_fd, ret; |
baf20995 | 97 | |
a90917c3 | 98 | session = lttng_session_create(); |
baf20995 MD |
99 | if (!session) |
100 | return -ENOMEM; | |
2a059b14 | 101 | session_fd = get_unused_fd_flags(0); |
baf20995 MD |
102 | if (session_fd < 0) { |
103 | ret = session_fd; | |
104 | goto fd_error; | |
105 | } | |
c0e31d2e | 106 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 107 | <tng_session_fops, |
baf20995 | 108 | session, O_RDWR); |
c0e31d2e MD |
109 | if (IS_ERR(session_file)) { |
110 | ret = PTR_ERR(session_file); | |
baf20995 MD |
111 | goto file_error; |
112 | } | |
8cdc1a81 | 113 | session->priv->file = session_file; |
c0e31d2e | 114 | fd_install(session_fd, session_file); |
baf20995 MD |
115 | return session_fd; |
116 | ||
117 | file_error: | |
118 | put_unused_fd(session_fd); | |
119 | fd_error: | |
a90917c3 | 120 | lttng_session_destroy(session); |
baf20995 MD |
121 | return ret; |
122 | } | |
123 | ||
21f58fb7 FD |
124 | void event_notifier_send_notification_work_wakeup(struct irq_work *entry) |
125 | { | |
126 | struct lttng_event_notifier_group *event_notifier_group = | |
127 | container_of(entry, struct lttng_event_notifier_group, | |
128 | wakeup_pending); | |
129 | wake_up_interruptible(&event_notifier_group->read_wait); | |
130 | } | |
131 | ||
750b05f2 FD |
132 | static |
133 | int lttng_abi_create_event_notifier_group(void) | |
134 | { | |
135 | struct lttng_event_notifier_group *event_notifier_group; | |
136 | struct file *event_notifier_group_file; | |
137 | int event_notifier_group_fd, ret; | |
138 | ||
139 | event_notifier_group = lttng_event_notifier_group_create(); | |
140 | if (!event_notifier_group) | |
141 | return -ENOMEM; | |
142 | ||
2a059b14 | 143 | event_notifier_group_fd = get_unused_fd_flags(0); |
750b05f2 FD |
144 | if (event_notifier_group_fd < 0) { |
145 | ret = event_notifier_group_fd; | |
146 | goto fd_error; | |
147 | } | |
148 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
149 | <tng_event_notifier_group_fops, | |
150 | event_notifier_group, O_RDWR); | |
151 | if (IS_ERR(event_notifier_group_file)) { | |
152 | ret = PTR_ERR(event_notifier_group_file); | |
153 | goto file_error; | |
154 | } | |
155 | ||
156 | event_notifier_group->file = event_notifier_group_file; | |
21f58fb7 FD |
157 | init_waitqueue_head(&event_notifier_group->read_wait); |
158 | init_irq_work(&event_notifier_group->wakeup_pending, | |
159 | event_notifier_send_notification_work_wakeup); | |
750b05f2 FD |
160 | fd_install(event_notifier_group_fd, event_notifier_group_file); |
161 | return event_notifier_group_fd; | |
162 | ||
163 | file_error: | |
164 | put_unused_fd(event_notifier_group_fd); | |
165 | fd_error: | |
166 | lttng_event_notifier_group_destroy(event_notifier_group); | |
167 | return ret; | |
168 | } | |
169 | ||
271b6681 MD |
170 | static |
171 | int lttng_abi_tracepoint_list(void) | |
172 | { | |
173 | struct file *tracepoint_list_file; | |
174 | int file_fd, ret; | |
175 | ||
2a059b14 | 176 | file_fd = get_unused_fd_flags(0); |
271b6681 MD |
177 | if (file_fd < 0) { |
178 | ret = file_fd; | |
179 | goto fd_error; | |
180 | } | |
30f18bf0 | 181 | |
8ee099b6 | 182 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
183 | <tng_tracepoint_list_fops, |
184 | NULL, O_RDWR); | |
185 | if (IS_ERR(tracepoint_list_file)) { | |
186 | ret = PTR_ERR(tracepoint_list_file); | |
187 | goto file_error; | |
188 | } | |
30f18bf0 MD |
189 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
190 | if (ret < 0) | |
191 | goto open_error; | |
271b6681 MD |
192 | fd_install(file_fd, tracepoint_list_file); |
193 | return file_fd; | |
194 | ||
30f18bf0 MD |
195 | open_error: |
196 | fput(tracepoint_list_file); | |
271b6681 MD |
197 | file_error: |
198 | put_unused_fd(file_fd); | |
199 | fd_error: | |
200 | return ret; | |
201 | } | |
202 | ||
f127e61e MD |
203 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
204 | static inline | |
205 | int lttng_abi_syscall_list(void) | |
206 | { | |
207 | return -ENOSYS; | |
208 | } | |
209 | #else | |
210 | static | |
211 | int lttng_abi_syscall_list(void) | |
212 | { | |
213 | struct file *syscall_list_file; | |
214 | int file_fd, ret; | |
215 | ||
2a059b14 | 216 | file_fd = get_unused_fd_flags(0); |
f127e61e MD |
217 | if (file_fd < 0) { |
218 | ret = file_fd; | |
219 | goto fd_error; | |
220 | } | |
221 | ||
222 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
223 | <tng_syscall_list_fops, | |
224 | NULL, O_RDWR); | |
225 | if (IS_ERR(syscall_list_file)) { | |
226 | ret = PTR_ERR(syscall_list_file); | |
227 | goto file_error; | |
228 | } | |
229 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
230 | if (ret < 0) | |
231 | goto open_error; | |
232 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
233 | return file_fd; |
234 | ||
235 | open_error: | |
236 | fput(syscall_list_file); | |
237 | file_error: | |
238 | put_unused_fd(file_fd); | |
239 | fd_error: | |
240 | return ret; | |
241 | } | |
242 | #endif | |
243 | ||
80c16bcf | 244 | static |
606828e4 | 245 | void lttng_abi_tracer_version(struct lttng_kernel_abi_tracer_version *v) |
80c16bcf | 246 | { |
6dccd6c1 JD |
247 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
248 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
249 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
250 | } |
251 | ||
42cabb80 | 252 | static |
606828e4 | 253 | void lttng_abi_tracer_abi_version(struct lttng_kernel_abi_tracer_abi_version *v) |
42cabb80 | 254 | { |
606828e4 MD |
255 | v->major = LTTNG_KERNEL_ABI_MAJOR_VERSION; |
256 | v->minor = LTTNG_KERNEL_ABI_MINOR_VERSION; | |
42cabb80 MD |
257 | } |
258 | ||
8070f5c0 MD |
259 | static |
260 | long lttng_abi_add_context(struct file *file, | |
606828e4 | 261 | struct lttng_kernel_abi_context *context_param, |
8cdc1a81 | 262 | struct lttng_kernel_ctx **ctx, struct lttng_kernel_session *session) |
8070f5c0 | 263 | { |
8070f5c0 | 264 | |
8cdc1a81 | 265 | if (session->priv->been_active) |
8070f5c0 MD |
266 | return -EPERM; |
267 | ||
6dccd6c1 | 268 | switch (context_param->ctx) { |
606828e4 | 269 | case LTTNG_KERNEL_ABI_CONTEXT_PID: |
8070f5c0 | 270 | return lttng_add_pid_to_ctx(ctx); |
606828e4 | 271 | case LTTNG_KERNEL_ABI_CONTEXT_PRIO: |
a8ad3613 | 272 | return lttng_add_prio_to_ctx(ctx); |
606828e4 | 273 | case LTTNG_KERNEL_ABI_CONTEXT_NICE: |
53f1f0ca | 274 | return lttng_add_nice_to_ctx(ctx); |
606828e4 | 275 | case LTTNG_KERNEL_ABI_CONTEXT_VPID: |
b64bc438 | 276 | return lttng_add_vpid_to_ctx(ctx); |
606828e4 | 277 | case LTTNG_KERNEL_ABI_CONTEXT_TID: |
b64bc438 | 278 | return lttng_add_tid_to_ctx(ctx); |
606828e4 | 279 | case LTTNG_KERNEL_ABI_CONTEXT_VTID: |
b64bc438 | 280 | return lttng_add_vtid_to_ctx(ctx); |
606828e4 | 281 | case LTTNG_KERNEL_ABI_CONTEXT_PPID: |
b64bc438 | 282 | return lttng_add_ppid_to_ctx(ctx); |
606828e4 | 283 | case LTTNG_KERNEL_ABI_CONTEXT_VPPID: |
b64bc438 | 284 | return lttng_add_vppid_to_ctx(ctx); |
606828e4 MD |
285 | case LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER: |
286 | context_param->u.perf_counter.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
6dccd6c1 JD |
287 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, |
288 | context_param->u.perf_counter.config, | |
289 | context_param->u.perf_counter.name, | |
c24a0d71 | 290 | ctx); |
606828e4 | 291 | case LTTNG_KERNEL_ABI_CONTEXT_PROCNAME: |
a2563e83 | 292 | return lttng_add_procname_to_ctx(ctx); |
606828e4 | 293 | case LTTNG_KERNEL_ABI_CONTEXT_HOSTNAME: |
975da2c0 | 294 | return lttng_add_hostname_to_ctx(ctx); |
606828e4 | 295 | case LTTNG_KERNEL_ABI_CONTEXT_CPU_ID: |
b3699d90 | 296 | return lttng_add_cpu_id_to_ctx(ctx); |
606828e4 | 297 | case LTTNG_KERNEL_ABI_CONTEXT_INTERRUPTIBLE: |
79150a49 | 298 | return lttng_add_interruptible_to_ctx(ctx); |
606828e4 | 299 | case LTTNG_KERNEL_ABI_CONTEXT_NEED_RESCHEDULE: |
79150a49 | 300 | return lttng_add_need_reschedule_to_ctx(ctx); |
606828e4 | 301 | case LTTNG_KERNEL_ABI_CONTEXT_PREEMPTIBLE: |
79150a49 | 302 | return lttng_add_preemptible_to_ctx(ctx); |
606828e4 | 303 | case LTTNG_KERNEL_ABI_CONTEXT_MIGRATABLE: |
79150a49 | 304 | return lttng_add_migratable_to_ctx(ctx); |
606828e4 MD |
305 | case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_KERNEL: |
306 | case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_USER: | |
2fa2d39a | 307 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); |
606828e4 | 308 | case LTTNG_KERNEL_ABI_CONTEXT_CGROUP_NS: |
a6cf40a4 | 309 | return lttng_add_cgroup_ns_to_ctx(ctx); |
606828e4 | 310 | case LTTNG_KERNEL_ABI_CONTEXT_IPC_NS: |
a6cf40a4 | 311 | return lttng_add_ipc_ns_to_ctx(ctx); |
606828e4 | 312 | case LTTNG_KERNEL_ABI_CONTEXT_MNT_NS: |
a6cf40a4 | 313 | return lttng_add_mnt_ns_to_ctx(ctx); |
606828e4 | 314 | case LTTNG_KERNEL_ABI_CONTEXT_NET_NS: |
a6cf40a4 | 315 | return lttng_add_net_ns_to_ctx(ctx); |
606828e4 | 316 | case LTTNG_KERNEL_ABI_CONTEXT_PID_NS: |
a6cf40a4 | 317 | return lttng_add_pid_ns_to_ctx(ctx); |
606828e4 | 318 | case LTTNG_KERNEL_ABI_CONTEXT_USER_NS: |
a6cf40a4 | 319 | return lttng_add_user_ns_to_ctx(ctx); |
606828e4 | 320 | case LTTNG_KERNEL_ABI_CONTEXT_UTS_NS: |
a6cf40a4 | 321 | return lttng_add_uts_ns_to_ctx(ctx); |
606828e4 | 322 | case LTTNG_KERNEL_ABI_CONTEXT_UID: |
dc923e75 | 323 | return lttng_add_uid_to_ctx(ctx); |
606828e4 | 324 | case LTTNG_KERNEL_ABI_CONTEXT_EUID: |
dc923e75 | 325 | return lttng_add_euid_to_ctx(ctx); |
606828e4 | 326 | case LTTNG_KERNEL_ABI_CONTEXT_SUID: |
dc923e75 | 327 | return lttng_add_suid_to_ctx(ctx); |
606828e4 | 328 | case LTTNG_KERNEL_ABI_CONTEXT_GID: |
dc923e75 | 329 | return lttng_add_gid_to_ctx(ctx); |
606828e4 | 330 | case LTTNG_KERNEL_ABI_CONTEXT_EGID: |
dc923e75 | 331 | return lttng_add_egid_to_ctx(ctx); |
606828e4 | 332 | case LTTNG_KERNEL_ABI_CONTEXT_SGID: |
dc923e75 | 333 | return lttng_add_sgid_to_ctx(ctx); |
606828e4 | 334 | case LTTNG_KERNEL_ABI_CONTEXT_VUID: |
dc923e75 | 335 | return lttng_add_vuid_to_ctx(ctx); |
606828e4 | 336 | case LTTNG_KERNEL_ABI_CONTEXT_VEUID: |
dc923e75 | 337 | return lttng_add_veuid_to_ctx(ctx); |
606828e4 | 338 | case LTTNG_KERNEL_ABI_CONTEXT_VSUID: |
dc923e75 | 339 | return lttng_add_vsuid_to_ctx(ctx); |
606828e4 | 340 | case LTTNG_KERNEL_ABI_CONTEXT_VGID: |
dc923e75 | 341 | return lttng_add_vgid_to_ctx(ctx); |
606828e4 | 342 | case LTTNG_KERNEL_ABI_CONTEXT_VEGID: |
dc923e75 | 343 | return lttng_add_vegid_to_ctx(ctx); |
606828e4 | 344 | case LTTNG_KERNEL_ABI_CONTEXT_VSGID: |
dc923e75 | 345 | return lttng_add_vsgid_to_ctx(ctx); |
606828e4 | 346 | case LTTNG_KERNEL_ABI_CONTEXT_TIME_NS: |
876e2e92 | 347 | return lttng_add_time_ns_to_ctx(ctx); |
8070f5c0 MD |
348 | default: |
349 | return -EINVAL; | |
350 | } | |
351 | } | |
352 | ||
ad1c05e1 MD |
353 | /** |
354 | * lttng_ioctl - lttng syscall through ioctl | |
355 | * | |
c0e31d2e | 356 | * @file: the file |
ad1c05e1 MD |
357 | * @cmd: the command |
358 | * @arg: command arg | |
359 | * | |
360 | * This ioctl implements lttng commands: | |
606828e4 | 361 | * LTTNG_KERNEL_ABI_SESSION |
ad1c05e1 | 362 | * Returns a LTTng trace session file descriptor |
606828e4 | 363 | * LTTNG_KERNEL_ABI_TRACER_VERSION |
271b6681 | 364 | * Returns the LTTng kernel tracer version |
606828e4 | 365 | * LTTNG_KERNEL_ABI_TRACEPOINT_LIST |
271b6681 | 366 | * Returns a file descriptor listing available tracepoints |
606828e4 | 367 | * LTTNG_KERNEL_ABI_WAIT_QUIESCENT |
360f38ea | 368 | * Returns after all previously running probes have completed |
606828e4 | 369 | * LTTNG_KERNEL_ABI_TRACER_ABI_VERSION |
42cabb80 | 370 | * Returns the LTTng kernel tracer ABI version |
606828e4 | 371 | * LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE |
750b05f2 | 372 | * Returns a LTTng event notifier group file descriptor |
ad1c05e1 MD |
373 | * |
374 | * The returned session will be deleted when its file descriptor is closed. | |
375 | */ | |
376 | static | |
c0e31d2e | 377 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
378 | { |
379 | switch (cmd) { | |
606828e4 MD |
380 | case LTTNG_KERNEL_ABI_OLD_SESSION: |
381 | case LTTNG_KERNEL_ABI_SESSION: | |
ad1c05e1 | 382 | return lttng_abi_create_session(); |
606828e4 | 383 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE: |
750b05f2 | 384 | return lttng_abi_create_event_notifier_group(); |
606828e4 | 385 | case LTTNG_KERNEL_ABI_OLD_TRACER_VERSION: |
6dccd6c1 | 386 | { |
606828e4 MD |
387 | struct lttng_kernel_abi_tracer_version v; |
388 | struct lttng_kernel_abi_old_tracer_version oldv; | |
389 | struct lttng_kernel_abi_old_tracer_version *uversion = | |
390 | (struct lttng_kernel_abi_old_tracer_version __user *) arg; | |
6dccd6c1 JD |
391 | |
392 | lttng_abi_tracer_version(&v); | |
393 | oldv.major = v.major; | |
394 | oldv.minor = v.minor; | |
395 | oldv.patchlevel = v.patchlevel; | |
396 | ||
397 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
398 | return -EFAULT; | |
399 | return 0; | |
400 | } | |
606828e4 | 401 | case LTTNG_KERNEL_ABI_TRACER_VERSION: |
6dccd6c1 | 402 | { |
606828e4 MD |
403 | struct lttng_kernel_abi_tracer_version version; |
404 | struct lttng_kernel_abi_tracer_version *uversion = | |
405 | (struct lttng_kernel_abi_tracer_version __user *) arg; | |
6dccd6c1 JD |
406 | |
407 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
408 | |
409 | if (copy_to_user(uversion, &version, sizeof(version))) | |
410 | return -EFAULT; | |
411 | return 0; | |
412 | } | |
606828e4 | 413 | case LTTNG_KERNEL_ABI_TRACER_ABI_VERSION: |
42cabb80 | 414 | { |
606828e4 MD |
415 | struct lttng_kernel_abi_tracer_abi_version version; |
416 | struct lttng_kernel_abi_tracer_abi_version *uversion = | |
417 | (struct lttng_kernel_abi_tracer_abi_version __user *) arg; | |
42cabb80 MD |
418 | |
419 | lttng_abi_tracer_abi_version(&version); | |
420 | ||
6dccd6c1 JD |
421 | if (copy_to_user(uversion, &version, sizeof(version))) |
422 | return -EFAULT; | |
423 | return 0; | |
424 | } | |
606828e4 MD |
425 | case LTTNG_KERNEL_ABI_OLD_TRACEPOINT_LIST: |
426 | case LTTNG_KERNEL_ABI_TRACEPOINT_LIST: | |
271b6681 | 427 | return lttng_abi_tracepoint_list(); |
606828e4 | 428 | case LTTNG_KERNEL_ABI_SYSCALL_LIST: |
2d2464bd | 429 | return lttng_abi_syscall_list(); |
606828e4 MD |
430 | case LTTNG_KERNEL_ABI_OLD_WAIT_QUIESCENT: |
431 | case LTTNG_KERNEL_ABI_WAIT_QUIESCENT: | |
5f7f9078 MD |
432 | synchronize_trace(); |
433 | return 0; | |
606828e4 | 434 | case LTTNG_KERNEL_ABI_OLD_CALIBRATE: |
6dccd6c1 | 435 | { |
606828e4 MD |
436 | struct lttng_kernel_abi_old_calibrate __user *ucalibrate = |
437 | (struct lttng_kernel_abi_old_calibrate __user *) arg; | |
438 | struct lttng_kernel_abi_old_calibrate old_calibrate; | |
439 | struct lttng_kernel_abi_calibrate calibrate; | |
6dccd6c1 JD |
440 | int ret; |
441 | ||
442 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
443 | return -EFAULT; | |
444 | calibrate.type = old_calibrate.type; | |
445 | ret = lttng_calibrate(&calibrate); | |
446 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
447 | return -EFAULT; | |
448 | return ret; | |
449 | } | |
606828e4 | 450 | case LTTNG_KERNEL_ABI_CALIBRATE: |
57105fc2 | 451 | { |
606828e4 MD |
452 | struct lttng_kernel_abi_calibrate __user *ucalibrate = |
453 | (struct lttng_kernel_abi_calibrate __user *) arg; | |
454 | struct lttng_kernel_abi_calibrate calibrate; | |
57105fc2 MD |
455 | int ret; |
456 | ||
457 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
458 | return -EFAULT; | |
459 | ret = lttng_calibrate(&calibrate); | |
460 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
461 | return -EFAULT; | |
462 | return ret; | |
463 | } | |
ad1c05e1 MD |
464 | default: |
465 | return -ENOIOCTLCMD; | |
466 | } | |
467 | } | |
468 | ||
5f4c791e | 469 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
059de147 MJ |
470 | static const struct proc_ops lttng_proc_ops = { |
471 | .proc_ioctl = lttng_ioctl, | |
472 | #ifdef CONFIG_COMPAT | |
473 | .proc_compat_ioctl = lttng_ioctl, | |
474 | #endif /* CONFIG_COMPAT */ | |
475 | }; | |
476 | #else | |
477 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 478 | .owner = THIS_MODULE, |
ad1c05e1 MD |
479 | .unlocked_ioctl = lttng_ioctl, |
480 | #ifdef CONFIG_COMPAT | |
03037b98 | 481 | .compat_ioctl = lttng_ioctl, |
059de147 | 482 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 483 | }; |
059de147 | 484 | #endif |
ad1c05e1 | 485 | |
5dbbdb43 | 486 | static |
c0e31d2e | 487 | int lttng_abi_create_channel(struct file *session_file, |
606828e4 | 488 | struct lttng_kernel_abi_channel *chan_param, |
5dbbdb43 | 489 | enum channel_type channel_type) |
baf20995 | 490 | { |
8cdc1a81 | 491 | struct lttng_kernel_session *session = session_file->private_data; |
88dfd899 | 492 | const struct file_operations *fops = NULL; |
5dbbdb43 | 493 | const char *transport_name; |
f7d06400 | 494 | struct lttng_kernel_channel_buffer *chan; |
c0e31d2e | 495 | struct file *chan_file; |
baf20995 | 496 | int chan_fd; |
ad1c05e1 | 497 | int ret = 0; |
baf20995 | 498 | |
2a059b14 | 499 | chan_fd = get_unused_fd_flags(0); |
baf20995 MD |
500 | if (chan_fd < 0) { |
501 | ret = chan_fd; | |
502 | goto fd_error; | |
503 | } | |
88dfd899 MD |
504 | switch (channel_type) { |
505 | case PER_CPU_CHANNEL: | |
506 | fops = <tng_channel_fops; | |
507 | break; | |
508 | case METADATA_CHANNEL: | |
509 | fops = <tng_metadata_fops; | |
510 | break; | |
511 | } | |
2470a237 | 512 | |
c0e31d2e | 513 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 514 | fops, |
03037b98 | 515 | NULL, O_RDWR); |
c0e31d2e MD |
516 | if (IS_ERR(chan_file)) { |
517 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
518 | goto file_error; |
519 | } | |
5dbbdb43 MD |
520 | switch (channel_type) { |
521 | case PER_CPU_CHANNEL: | |
606828e4 | 522 | if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) { |
6dccd6c1 | 523 | transport_name = chan_param->overwrite ? |
96ba7208 | 524 | "relay-overwrite" : "relay-discard"; |
606828e4 | 525 | } else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) { |
6dccd6c1 | 526 | transport_name = chan_param->overwrite ? |
96ba7208 JD |
527 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
528 | } else { | |
529 | return -EINVAL; | |
530 | } | |
5dbbdb43 | 531 | break; |
5dbbdb43 | 532 | case METADATA_CHANNEL: |
606828e4 | 533 | if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) |
96ba7208 | 534 | transport_name = "relay-metadata"; |
606828e4 | 535 | else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) |
96ba7208 JD |
536 | transport_name = "relay-metadata-mmap"; |
537 | else | |
538 | return -EINVAL; | |
5dbbdb43 MD |
539 | break; |
540 | default: | |
541 | transport_name = "<unknown>"; | |
542 | break; | |
543 | } | |
98d7281c MJ |
544 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
545 | ret = -EOVERFLOW; | |
9c1f4643 MD |
546 | goto refcount_error; |
547 | } | |
03037b98 MD |
548 | /* |
549 | * We tolerate no failure path after channel creation. It will stay | |
550 | * invariant for the rest of the session. | |
551 | */ | |
4e252d1e | 552 | chan = lttng_channel_buffer_create(session, transport_name, NULL, |
6dccd6c1 JD |
553 | chan_param->subbuf_size, |
554 | chan_param->num_subbuf, | |
555 | chan_param->switch_timer_interval, | |
d83004aa JD |
556 | chan_param->read_timer_interval, |
557 | channel_type); | |
03037b98 | 558 | if (!chan) { |
f3d01b96 | 559 | ret = -EINVAL; |
03037b98 MD |
560 | goto chan_error; |
561 | } | |
f7d06400 | 562 | chan->priv->parent.file = chan_file; |
c0e31d2e MD |
563 | chan_file->private_data = chan; |
564 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 565 | |
baf20995 MD |
566 | return chan_fd; |
567 | ||
03037b98 | 568 | chan_error: |
9c1f4643 MD |
569 | atomic_long_dec(&session_file->f_count); |
570 | refcount_error: | |
c0e31d2e | 571 | fput(chan_file); |
baf20995 MD |
572 | file_error: |
573 | put_unused_fd(chan_fd); | |
574 | fd_error: | |
baf20995 MD |
575 | return ret; |
576 | } | |
577 | ||
7f859fbf | 578 | static |
8cdc1a81 | 579 | int lttng_abi_session_set_name(struct lttng_kernel_session *session, |
606828e4 | 580 | struct lttng_kernel_abi_session_name *name) |
7f859fbf JR |
581 | { |
582 | size_t len; | |
583 | ||
606828e4 | 584 | len = strnlen(name->name, LTTNG_KERNEL_ABI_SESSION_NAME_LEN); |
7f859fbf | 585 | |
606828e4 | 586 | if (len == LTTNG_KERNEL_ABI_SESSION_NAME_LEN) { |
7f859fbf JR |
587 | /* Name is too long/malformed */ |
588 | return -EINVAL; | |
589 | } | |
590 | ||
8cdc1a81 | 591 | strcpy(session->priv->name, name->name); |
7f859fbf JR |
592 | return 0; |
593 | } | |
594 | ||
1c88f269 | 595 | static |
8cdc1a81 | 596 | int lttng_abi_session_set_creation_time(struct lttng_kernel_session *session, |
606828e4 | 597 | struct lttng_kernel_abi_session_creation_time *time) |
1c88f269 JR |
598 | { |
599 | size_t len; | |
600 | ||
606828e4 | 601 | len = strnlen(time->iso8601, LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN); |
1c88f269 | 602 | |
606828e4 | 603 | if (len == LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN) { |
1c88f269 JR |
604 | /* Time is too long/malformed */ |
605 | return -EINVAL; | |
606 | } | |
607 | ||
8cdc1a81 | 608 | strcpy(session->priv->creation_time, time->iso8601); |
1c88f269 JR |
609 | return 0; |
610 | } | |
611 | ||
99f52fcc FD |
612 | static |
613 | int lttng_counter_release(struct inode *inode, struct file *file) | |
614 | { | |
615 | struct lttng_counter *counter = file->private_data; | |
616 | ||
617 | if (counter) { | |
618 | /* | |
619 | * Do not destroy the counter itself. Wait of the owner | |
620 | * (event_notifier group) to be destroyed. | |
621 | */ | |
622 | fput(counter->owner); | |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | static | |
629 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
630 | { | |
631 | struct lttng_counter *counter = file->private_data; | |
606828e4 | 632 | size_t indexes[LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX] = { 0 }; |
99f52fcc FD |
633 | int i; |
634 | ||
635 | switch (cmd) { | |
606828e4 | 636 | case LTTNG_KERNEL_ABI_COUNTER_READ: |
99f52fcc | 637 | { |
606828e4 MD |
638 | struct lttng_kernel_abi_counter_read local_counter_read; |
639 | struct lttng_kernel_abi_counter_read __user *ucounter_read = | |
640 | (struct lttng_kernel_abi_counter_read __user *) arg; | |
99f52fcc FD |
641 | bool overflow, underflow; |
642 | int64_t value; | |
643 | int32_t cpu; | |
644 | int ret; | |
645 | ||
646 | if (copy_from_user(&local_counter_read, ucounter_read, | |
647 | sizeof(local_counter_read))) | |
648 | return -EFAULT; | |
649 | if (validate_zeroed_padding(local_counter_read.padding, | |
650 | sizeof(local_counter_read.padding))) | |
651 | return -EINVAL; | |
20b5f0d8 MD |
652 | if (local_counter_read.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX) |
653 | return -EINVAL; | |
99f52fcc FD |
654 | |
655 | /* Cast all indexes into size_t. */ | |
656 | for (i = 0; i < local_counter_read.index.number_dimensions; i++) | |
657 | indexes[i] = (size_t) local_counter_read.index.dimension_indexes[i]; | |
658 | cpu = local_counter_read.cpu; | |
659 | ||
660 | ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, | |
661 | &overflow, &underflow); | |
662 | if (ret) | |
663 | return ret; | |
664 | local_counter_read.value.value = value; | |
665 | local_counter_read.value.overflow = overflow; | |
666 | local_counter_read.value.underflow = underflow; | |
667 | ||
668 | if (copy_to_user(&ucounter_read->value, &local_counter_read.value, | |
669 | sizeof(local_counter_read.value))) | |
670 | return -EFAULT; | |
671 | ||
672 | return 0; | |
673 | } | |
606828e4 | 674 | case LTTNG_KERNEL_ABI_COUNTER_AGGREGATE: |
99f52fcc | 675 | { |
606828e4 MD |
676 | struct lttng_kernel_abi_counter_aggregate local_counter_aggregate; |
677 | struct lttng_kernel_abi_counter_aggregate __user *ucounter_aggregate = | |
678 | (struct lttng_kernel_abi_counter_aggregate __user *) arg; | |
99f52fcc FD |
679 | bool overflow, underflow; |
680 | int64_t value; | |
681 | int ret; | |
682 | ||
683 | if (copy_from_user(&local_counter_aggregate, ucounter_aggregate, | |
684 | sizeof(local_counter_aggregate))) | |
685 | return -EFAULT; | |
686 | if (validate_zeroed_padding(local_counter_aggregate.padding, | |
687 | sizeof(local_counter_aggregate.padding))) | |
688 | return -EINVAL; | |
20b5f0d8 MD |
689 | if (local_counter_aggregate.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX) |
690 | return -EINVAL; | |
99f52fcc FD |
691 | |
692 | /* Cast all indexes into size_t. */ | |
693 | for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++) | |
694 | indexes[i] = (size_t) local_counter_aggregate.index.dimension_indexes[i]; | |
695 | ||
696 | ret = lttng_kernel_counter_aggregate(counter, indexes, &value, | |
697 | &overflow, &underflow); | |
698 | if (ret) | |
699 | return ret; | |
700 | local_counter_aggregate.value.value = value; | |
701 | local_counter_aggregate.value.overflow = overflow; | |
702 | local_counter_aggregate.value.underflow = underflow; | |
703 | ||
704 | if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value, | |
705 | sizeof(local_counter_aggregate.value))) | |
706 | return -EFAULT; | |
707 | ||
708 | return 0; | |
709 | } | |
606828e4 | 710 | case LTTNG_KERNEL_ABI_COUNTER_CLEAR: |
99f52fcc | 711 | { |
606828e4 MD |
712 | struct lttng_kernel_abi_counter_clear local_counter_clear; |
713 | struct lttng_kernel_abi_counter_clear __user *ucounter_clear = | |
714 | (struct lttng_kernel_abi_counter_clear __user *) arg; | |
99f52fcc FD |
715 | |
716 | if (copy_from_user(&local_counter_clear, ucounter_clear, | |
717 | sizeof(local_counter_clear))) | |
718 | return -EFAULT; | |
719 | if (validate_zeroed_padding(local_counter_clear.padding, | |
720 | sizeof(local_counter_clear.padding))) | |
721 | return -EINVAL; | |
20b5f0d8 MD |
722 | if (local_counter_clear.index.number_dimensions > LTTNG_KERNEL_ABI_COUNTER_DIMENSION_MAX) |
723 | return -EINVAL; | |
99f52fcc FD |
724 | |
725 | /* Cast all indexes into size_t. */ | |
726 | for (i = 0; i < local_counter_clear.index.number_dimensions; i++) | |
727 | indexes[i] = (size_t) local_counter_clear.index.dimension_indexes[i]; | |
728 | ||
729 | return lttng_kernel_counter_clear(counter, indexes); | |
730 | } | |
731 | default: | |
99f52fcc FD |
732 | return -ENOSYS; |
733 | } | |
734 | } | |
735 | ||
736 | static const struct file_operations lttng_counter_fops = { | |
737 | .owner = THIS_MODULE, | |
738 | .release = lttng_counter_release, | |
739 | .unlocked_ioctl = lttng_counter_ioctl, | |
740 | #ifdef CONFIG_COMPAT | |
741 | .compat_ioctl = lttng_counter_ioctl, | |
742 | #endif | |
743 | }; | |
744 | ||
745 | ||
d1f652f8 | 746 | static |
606828e4 | 747 | enum tracker_type get_tracker_type(struct lttng_kernel_abi_tracker_args *tracker) |
d1f652f8 MD |
748 | { |
749 | switch (tracker->type) { | |
606828e4 | 750 | case LTTNG_KERNEL_ABI_TRACKER_PID: |
d1f652f8 | 751 | return TRACKER_PID; |
606828e4 | 752 | case LTTNG_KERNEL_ABI_TRACKER_VPID: |
d1f652f8 | 753 | return TRACKER_VPID; |
606828e4 | 754 | case LTTNG_KERNEL_ABI_TRACKER_UID: |
d1f652f8 | 755 | return TRACKER_UID; |
606828e4 | 756 | case LTTNG_KERNEL_ABI_TRACKER_VUID: |
d1f652f8 | 757 | return TRACKER_VUID; |
606828e4 | 758 | case LTTNG_KERNEL_ABI_TRACKER_GID: |
d1f652f8 | 759 | return TRACKER_GID; |
606828e4 | 760 | case LTTNG_KERNEL_ABI_TRACKER_VGID: |
d1f652f8 MD |
761 | return TRACKER_VGID; |
762 | default: | |
763 | return TRACKER_UNKNOWN; | |
764 | } | |
765 | } | |
766 | ||
baf20995 | 767 | /** |
ad1c05e1 | 768 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 769 | * |
c0e31d2e | 770 | * @file: the file |
baf20995 MD |
771 | * @cmd: the command |
772 | * @arg: command arg | |
773 | * | |
774 | * This ioctl implements lttng commands: | |
606828e4 | 775 | * LTTNG_KERNEL_ABI_CHANNEL |
baf20995 | 776 | * Returns a LTTng channel file descriptor |
606828e4 | 777 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 778 | * Enables tracing for a session (weak enable) |
606828e4 | 779 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 780 | * Disables tracing for a session (strong disable) |
606828e4 | 781 | * LTTNG_KERNEL_ABI_METADATA |
8070f5c0 | 782 | * Returns a LTTng metadata file descriptor |
606828e4 | 783 | * LTTNG_KERNEL_ABI_SESSION_TRACK_PID |
d1f652f8 | 784 | * Add PID to session PID tracker |
606828e4 | 785 | * LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID |
d1f652f8 | 786 | * Remove PID from session PID tracker |
606828e4 | 787 | * LTTNG_KERNEL_ABI_SESSION_TRACK_ID |
d1f652f8 | 788 | * Add ID to tracker |
606828e4 | 789 | * LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID |
d1f652f8 | 790 | * Remove ID from tracker |
ad1c05e1 MD |
791 | * |
792 | * The returned channel will be deleted when its file descriptor is closed. | |
793 | */ | |
794 | static | |
c0e31d2e | 795 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 796 | { |
8cdc1a81 | 797 | struct lttng_kernel_session *session = file->private_data; |
606828e4 MD |
798 | struct lttng_kernel_abi_channel chan_param; |
799 | struct lttng_kernel_abi_old_channel old_chan_param; | |
c0e31d2e | 800 | |
8c71721f MD |
801 | /* |
802 | * Handle backward compatibility. OLD commands have wrong | |
803 | * directions, replace them by the correct direction. | |
804 | */ | |
805 | switch (cmd) { | |
806 | case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_PID: | |
807 | cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_PID; | |
808 | break; | |
809 | case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_PID: | |
810 | cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID; | |
811 | break; | |
812 | case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_ID: | |
813 | cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_ID; | |
814 | break; | |
815 | case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_ID: | |
816 | cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID; | |
817 | break; | |
818 | case LTTNG_KERNEL_ABI_OLD_SESSION_LIST_TRACKER_IDS: | |
819 | cmd = LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS; | |
820 | break; | |
821 | case LTTNG_KERNEL_ABI_OLD_SESSION_SET_NAME: | |
822 | cmd = LTTNG_KERNEL_ABI_SESSION_SET_NAME; | |
823 | break; | |
824 | case LTTNG_KERNEL_ABI_OLD_SESSION_SET_CREATION_TIME: | |
825 | cmd = LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME; | |
826 | break; | |
827 | default: | |
828 | /* Nothing to do. */ | |
829 | break; | |
830 | } | |
831 | ||
ad1c05e1 | 832 | switch (cmd) { |
606828e4 | 833 | case LTTNG_KERNEL_ABI_OLD_CHANNEL: |
6dccd6c1 | 834 | { |
6dccd6c1 | 835 | if (copy_from_user(&old_chan_param, |
606828e4 MD |
836 | (struct lttng_kernel_abi_old_channel __user *) arg, |
837 | sizeof(struct lttng_kernel_abi_old_channel))) | |
6dccd6c1 JD |
838 | return -EFAULT; |
839 | chan_param.overwrite = old_chan_param.overwrite; | |
840 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
841 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
842 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
843 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
844 | chan_param.output = old_chan_param.output; | |
845 | ||
846 | return lttng_abi_create_channel(file, &chan_param, | |
847 | PER_CPU_CHANNEL); | |
848 | } | |
606828e4 | 849 | case LTTNG_KERNEL_ABI_CHANNEL: |
6dccd6c1 | 850 | { |
6dccd6c1 | 851 | if (copy_from_user(&chan_param, |
606828e4 MD |
852 | (struct lttng_kernel_abi_channel __user *) arg, |
853 | sizeof(struct lttng_kernel_abi_channel))) | |
6dccd6c1 JD |
854 | return -EFAULT; |
855 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 856 | PER_CPU_CHANNEL); |
6dccd6c1 | 857 | } |
606828e4 MD |
858 | case LTTNG_KERNEL_ABI_OLD_SESSION_START: |
859 | case LTTNG_KERNEL_ABI_OLD_ENABLE: | |
860 | case LTTNG_KERNEL_ABI_SESSION_START: | |
861 | case LTTNG_KERNEL_ABI_ENABLE: | |
a90917c3 | 862 | return lttng_session_enable(session); |
606828e4 MD |
863 | case LTTNG_KERNEL_ABI_OLD_SESSION_STOP: |
864 | case LTTNG_KERNEL_ABI_OLD_DISABLE: | |
865 | case LTTNG_KERNEL_ABI_SESSION_STOP: | |
866 | case LTTNG_KERNEL_ABI_DISABLE: | |
a90917c3 | 867 | return lttng_session_disable(session); |
606828e4 | 868 | case LTTNG_KERNEL_ABI_OLD_METADATA: |
6dccd6c1 | 869 | { |
6dccd6c1 | 870 | if (copy_from_user(&old_chan_param, |
606828e4 MD |
871 | (struct lttng_kernel_abi_old_channel __user *) arg, |
872 | sizeof(struct lttng_kernel_abi_old_channel))) | |
6dccd6c1 JD |
873 | return -EFAULT; |
874 | chan_param.overwrite = old_chan_param.overwrite; | |
875 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
876 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
877 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
878 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
879 | chan_param.output = old_chan_param.output; | |
880 | ||
881 | return lttng_abi_create_channel(file, &chan_param, | |
882 | METADATA_CHANNEL); | |
883 | } | |
606828e4 | 884 | case LTTNG_KERNEL_ABI_METADATA: |
6dccd6c1 | 885 | { |
6dccd6c1 | 886 | if (copy_from_user(&chan_param, |
606828e4 MD |
887 | (struct lttng_kernel_abi_channel __user *) arg, |
888 | sizeof(struct lttng_kernel_abi_channel))) | |
6dccd6c1 JD |
889 | return -EFAULT; |
890 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 891 | METADATA_CHANNEL); |
6dccd6c1 | 892 | } |
606828e4 | 893 | case LTTNG_KERNEL_ABI_SESSION_TRACK_PID: |
d1f652f8 | 894 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
606828e4 | 895 | case LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID: |
d1f652f8 | 896 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
606828e4 | 897 | case LTTNG_KERNEL_ABI_SESSION_TRACK_ID: |
d1f652f8 | 898 | { |
606828e4 | 899 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
900 | enum tracker_type tracker_type; |
901 | ||
902 | if (copy_from_user(&tracker, | |
606828e4 MD |
903 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
904 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
905 | return -EFAULT; |
906 | tracker_type = get_tracker_type(&tracker); | |
907 | if (tracker_type == TRACKER_UNKNOWN) | |
908 | return -EINVAL; | |
909 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
910 | } | |
606828e4 | 911 | case LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID: |
d1f652f8 | 912 | { |
606828e4 | 913 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
914 | enum tracker_type tracker_type; |
915 | ||
916 | if (copy_from_user(&tracker, | |
606828e4 MD |
917 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
918 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
919 | return -EFAULT; |
920 | tracker_type = get_tracker_type(&tracker); | |
921 | if (tracker_type == TRACKER_UNKNOWN) | |
922 | return -EINVAL; | |
923 | return lttng_session_untrack_id(session, tracker_type, | |
924 | tracker.id); | |
925 | } | |
606828e4 | 926 | case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 | 927 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
606828e4 | 928 | case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS: |
d1f652f8 | 929 | { |
606828e4 | 930 | struct lttng_kernel_abi_tracker_args tracker; |
d1f652f8 MD |
931 | enum tracker_type tracker_type; |
932 | ||
933 | if (copy_from_user(&tracker, | |
606828e4 MD |
934 | (struct lttng_kernel_abi_tracker_args __user *) arg, |
935 | sizeof(struct lttng_kernel_abi_tracker_args))) | |
d1f652f8 MD |
936 | return -EFAULT; |
937 | tracker_type = get_tracker_type(&tracker); | |
938 | if (tracker_type == TRACKER_UNKNOWN) | |
939 | return -EINVAL; | |
940 | return lttng_session_list_tracker_ids(session, tracker_type); | |
941 | } | |
606828e4 | 942 | case LTTNG_KERNEL_ABI_SESSION_METADATA_REGEN: |
9616f0bf | 943 | return lttng_session_metadata_regenerate(session); |
606828e4 | 944 | case LTTNG_KERNEL_ABI_SESSION_STATEDUMP: |
601252cf | 945 | return lttng_session_statedump(session); |
606828e4 | 946 | case LTTNG_KERNEL_ABI_SESSION_SET_NAME: |
7f859fbf | 947 | { |
606828e4 | 948 | struct lttng_kernel_abi_session_name name; |
7f859fbf JR |
949 | |
950 | if (copy_from_user(&name, | |
606828e4 MD |
951 | (struct lttng_kernel_abi_session_name __user *) arg, |
952 | sizeof(struct lttng_kernel_abi_session_name))) | |
7f859fbf JR |
953 | return -EFAULT; |
954 | return lttng_abi_session_set_name(session, &name); | |
955 | } | |
606828e4 | 956 | case LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME: |
1c88f269 | 957 | { |
606828e4 | 958 | struct lttng_kernel_abi_session_creation_time time; |
1c88f269 JR |
959 | |
960 | if (copy_from_user(&time, | |
606828e4 MD |
961 | (struct lttng_kernel_abi_session_creation_time __user *) arg, |
962 | sizeof(struct lttng_kernel_abi_session_creation_time))) | |
1c88f269 JR |
963 | return -EFAULT; |
964 | return lttng_abi_session_set_creation_time(session, &time); | |
965 | } | |
ad1c05e1 MD |
966 | default: |
967 | return -ENOIOCTLCMD; | |
968 | } | |
969 | } | |
970 | ||
03037b98 MD |
971 | /* |
972 | * Called when the last file reference is dropped. | |
973 | * | |
974 | * Big fat note: channels and events are invariant for the whole session after | |
975 | * their creation. So this session destruction also destroys all channel and | |
976 | * event structures specific to this session (they are not destroyed when their | |
977 | * individual file is released). | |
978 | */ | |
ad1c05e1 | 979 | static |
03037b98 | 980 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 981 | { |
8cdc1a81 | 982 | struct lttng_kernel_session *session = file->private_data; |
c269fff4 MD |
983 | |
984 | if (session) | |
a90917c3 | 985 | lttng_session_destroy(session); |
11b5a3c2 | 986 | return 0; |
ad1c05e1 | 987 | } |
ad1c05e1 MD |
988 | |
989 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 990 | .owner = THIS_MODULE, |
03037b98 | 991 | .release = lttng_session_release, |
ad1c05e1 MD |
992 | .unlocked_ioctl = lttng_session_ioctl, |
993 | #ifdef CONFIG_COMPAT | |
03037b98 | 994 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 995 | #endif |
11b5a3c2 | 996 | }; |
ad1c05e1 | 997 | |
db2511b4 MD |
998 | /* |
999 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
1000 | * and retry (if new data available to read after flush). | |
1001 | */ | |
1002 | static | |
1003 | ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf, | |
1004 | size_t count, loff_t *ppos) | |
1005 | { | |
1006 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
860c213b | 1007 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
e20c0fec | 1008 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1009 | ssize_t read_count = 0, len; |
1010 | size_t read_offset; | |
1011 | ||
1012 | might_sleep(); | |
1013 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
1014 | return -EFAULT; | |
1015 | ||
1016 | /* Finish copy of previous record */ | |
1017 | if (*ppos != 0) { | |
08c43e0d | 1018 | if (count != 0) { |
db2511b4 MD |
1019 | len = chan->iter.len_left; |
1020 | read_offset = *ppos; | |
1021 | goto skip_get_next; | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | while (read_count < count) { | |
1026 | size_t copy_len, space_left; | |
1027 | ||
1028 | len = lib_ring_buffer_get_next_record(chan, buf); | |
1029 | len_test: | |
1030 | if (len < 0) { | |
1031 | /* | |
1032 | * Check if buffer is finalized (end of file). | |
1033 | */ | |
1034 | if (len == -ENODATA) { | |
1035 | /* A 0 read_count will tell about end of file */ | |
1036 | goto nodata; | |
1037 | } | |
1038 | if (filp->f_flags & O_NONBLOCK) { | |
1039 | if (!read_count) | |
1040 | read_count = -EAGAIN; | |
1041 | goto nodata; | |
1042 | } else { | |
1043 | int error; | |
1044 | ||
1045 | /* | |
1046 | * No data available at the moment, return what | |
1047 | * we got. | |
1048 | */ | |
1049 | if (read_count) | |
1050 | goto nodata; | |
1051 | ||
1052 | /* | |
1053 | * Wait for returned len to be >= 0 or -ENODATA. | |
1054 | */ | |
1055 | error = wait_event_interruptible( | |
1056 | event_notifier_group->read_wait, | |
1057 | ((len = lib_ring_buffer_get_next_record( | |
1058 | chan, buf)), len != -EAGAIN)); | |
1059 | CHAN_WARN_ON(chan, len == -EBUSY); | |
1060 | if (error) { | |
1061 | read_count = error; | |
1062 | goto nodata; | |
1063 | } | |
1064 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
1065 | goto len_test; | |
1066 | } | |
1067 | } | |
1068 | read_offset = buf->iter.read_offset; | |
1069 | skip_get_next: | |
1070 | space_left = count - read_count; | |
1071 | if (len <= space_left) { | |
1072 | copy_len = len; | |
1073 | chan->iter.len_left = 0; | |
1074 | *ppos = 0; | |
1075 | } else { | |
1076 | copy_len = space_left; | |
1077 | chan->iter.len_left = len - copy_len; | |
1078 | *ppos = read_offset + copy_len; | |
1079 | } | |
1080 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
1081 | &user_buf[read_count], | |
1082 | copy_len)) { | |
1083 | /* | |
1084 | * Leave the len_left and ppos values at their current | |
1085 | * state, as we currently have a valid event to read. | |
1086 | */ | |
1087 | return -EFAULT; | |
1088 | } | |
1089 | read_count += copy_len; | |
1090 | } | |
31c02fb7 | 1091 | goto put_record; |
db2511b4 MD |
1092 | |
1093 | nodata: | |
1094 | *ppos = 0; | |
1095 | chan->iter.len_left = 0; | |
31c02fb7 MD |
1096 | |
1097 | put_record: | |
08c43e0d MD |
1098 | if (*ppos == 0) |
1099 | lib_ring_buffer_put_current_record(buf); | |
db2511b4 MD |
1100 | return read_count; |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
1105 | * there is data available. Perform a ring buffer flush if we encounter a | |
1106 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
1107 | */ | |
1108 | static | |
1109 | unsigned int lttng_event_notifier_group_notif_poll(struct file *filp, | |
1110 | poll_table *wait) | |
1111 | { | |
1112 | unsigned int mask = 0; | |
1113 | struct lttng_event_notifier_group *event_notifier_group = filp->private_data; | |
860c213b | 1114 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
e20c0fec MD |
1115 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
1116 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; | |
db2511b4 MD |
1117 | int finalized, disabled; |
1118 | unsigned long consumed, offset; | |
18f12d55 | 1119 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); |
db2511b4 MD |
1120 | |
1121 | if (filp->f_mode & FMODE_READ) { | |
1122 | poll_wait_set_exclusive(wait); | |
1123 | poll_wait(filp, &event_notifier_group->read_wait, wait); | |
1124 | ||
1125 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1126 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1127 | ||
1128 | /* | |
1129 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1130 | * finalized load before offsets loads. | |
1131 | */ | |
1132 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1133 | retry: | |
1134 | if (disabled) | |
1135 | return POLLERR; | |
1136 | ||
1137 | offset = lib_ring_buffer_get_offset(config, buf); | |
1138 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1139 | ||
1140 | /* | |
1141 | * If there is no buffer available to consume. | |
1142 | */ | |
1143 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1144 | /* | |
1145 | * If there is a non-empty subbuffer, flush and try again. | |
1146 | */ | |
18f12d55 | 1147 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { |
db2511b4 MD |
1148 | lib_ring_buffer_switch_remote(buf); |
1149 | goto retry; | |
1150 | } | |
1151 | ||
1152 | if (finalized) | |
1153 | return POLLHUP; | |
1154 | else { | |
1155 | /* | |
1156 | * The memory barriers | |
1157 | * __wait_event()/wake_up_interruptible() take | |
1158 | * care of "raw_spin_is_locked" memory ordering. | |
1159 | */ | |
1160 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1161 | goto retry; | |
1162 | else | |
1163 | return 0; | |
1164 | } | |
1165 | } else { | |
1166 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1167 | >= chan->backend.buf_size) | |
1168 | return POLLPRI | POLLRDBAND; | |
1169 | else | |
1170 | return POLLIN | POLLRDNORM; | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | return mask; | |
1175 | } | |
1176 | ||
1177 | /** | |
1178 | * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation | |
1179 | * @inode: opened inode | |
1180 | * @file: opened file | |
1181 | * | |
1182 | * Open implementation. Makes sure only one open instance of a buffer is | |
1183 | * done at a given moment. | |
1184 | */ | |
1185 | static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file) | |
1186 | { | |
1187 | struct lttng_event_notifier_group *event_notifier_group = inode->i_private; | |
e20c0fec | 1188 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1189 | |
1190 | file->private_data = event_notifier_group; | |
1191 | return lib_ring_buffer_open(inode, file, buf); | |
1192 | } | |
1193 | ||
1194 | /** | |
1195 | * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation | |
1196 | * @inode: opened inode | |
1197 | * @file: opened file | |
1198 | * | |
1199 | * Release implementation. | |
1200 | */ | |
1201 | static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file) | |
1202 | { | |
1203 | struct lttng_event_notifier_group *event_notifier_group = file->private_data; | |
e20c0fec | 1204 | struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf; |
db2511b4 MD |
1205 | int ret; |
1206 | ||
1207 | ret = lib_ring_buffer_release(inode, file, buf); | |
1208 | if (ret) | |
1209 | return ret; | |
1210 | fput(event_notifier_group->file); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
21f58fb7 FD |
1214 | static const struct file_operations lttng_event_notifier_group_notif_fops = { |
1215 | .owner = THIS_MODULE, | |
db2511b4 MD |
1216 | .open = lttng_event_notifier_group_notif_open, |
1217 | .release = lttng_event_notifier_group_notif_release, | |
1218 | .read = lttng_event_notifier_group_notif_read, | |
1219 | .poll = lttng_event_notifier_group_notif_poll, | |
21f58fb7 FD |
1220 | }; |
1221 | ||
d83004aa JD |
1222 | /** |
1223 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1224 | * @filp: the file | |
1225 | * @wait: poll table | |
1226 | * | |
1227 | * Handles the poll operations for the metadata channels. | |
1228 | */ | |
ad1c05e1 | 1229 | static |
d83004aa JD |
1230 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1231 | poll_table *wait) | |
1232 | { | |
1233 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1234 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1235 | int finalized; |
1236 | unsigned int mask = 0; | |
1237 | ||
1238 | if (filp->f_mode & FMODE_READ) { | |
1239 | poll_wait_set_exclusive(wait); | |
1240 | poll_wait(filp, &stream->read_wait, wait); | |
1241 | ||
1242 | finalized = stream->finalized; | |
1243 | ||
1244 | /* | |
1245 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1246 | * ordering finalized load before offsets loads. | |
1247 | */ | |
1248 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1249 | ||
1250 | if (finalized) | |
1251 | mask |= POLLHUP; | |
1252 | ||
92d9f5e6 | 1253 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1254 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1255 | stream->metadata_out) |
d83004aa | 1256 | mask |= POLLIN; |
92d9f5e6 | 1257 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1258 | } |
1259 | ||
1260 | return mask; | |
1261 | } | |
1262 | ||
f613e3e6 MD |
1263 | static |
1264 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1265 | unsigned int cmd, unsigned long arg) | |
1266 | { | |
1267 | struct lttng_metadata_stream *stream = filp->private_data; | |
1268 | ||
1269 | stream->metadata_out = stream->metadata_in; | |
1270 | } | |
1271 | ||
d1344afa JD |
1272 | /* |
1273 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1274 | * the consumer receives the content of the metadata cache unchanged. This is | |
1275 | * different from the metadata_regenerate where the offset from epoch is | |
1276 | * resampled, here we want the exact same content as the last time the metadata | |
1277 | * was generated. This command is only possible if all the metadata written | |
1278 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1279 | * metadata file. | |
1280 | * | |
1281 | * Return 0 on success, a negative value on error. | |
1282 | */ | |
1283 | static | |
1284 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1285 | { | |
1286 | int ret; | |
1287 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1288 | ||
1289 | mutex_lock(&cache->lock); | |
1290 | if (stream->metadata_out != cache->metadata_written) { | |
1291 | ret = -EBUSY; | |
1292 | goto end; | |
1293 | } | |
1294 | stream->metadata_out = 0; | |
1295 | stream->metadata_in = 0; | |
1296 | wake_up_interruptible(&stream->read_wait); | |
1297 | ret = 0; | |
1298 | ||
1299 | end: | |
1300 | mutex_unlock(&cache->lock); | |
1301 | return ret; | |
1302 | } | |
1303 | ||
d83004aa JD |
1304 | static |
1305 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1306 | unsigned int cmd, unsigned long arg) | |
1307 | { | |
1308 | int ret; | |
1309 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1310 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
8b97fd42 MD |
1311 | unsigned int rb_cmd; |
1312 | bool coherent; | |
1313 | ||
606828e4 MD |
1314 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1315 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1316 | else |
1317 | rb_cmd = cmd; | |
d83004aa JD |
1318 | |
1319 | switch (cmd) { | |
606828e4 | 1320 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1321 | { |
35097f36 | 1322 | struct lttng_metadata_stream *stream = filp->private_data; |
e20c0fec | 1323 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
860c213b | 1324 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 | 1325 | |
8b97fd42 | 1326 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1327 | if (ret > 0) { |
1328 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1329 | ret = 0; | |
1330 | } else if (ret < 0) | |
d83004aa JD |
1331 | goto err; |
1332 | break; | |
1333 | } | |
606828e4 | 1334 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1335 | { |
1336 | /* | |
1337 | * Random access is not allowed for metadata channel. | |
1338 | */ | |
1339 | return -ENOSYS; | |
1340 | } | |
c190d76e MJ |
1341 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: |
1342 | lttng_fallthrough; | |
606828e4 | 1343 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: |
35097f36 JD |
1344 | { |
1345 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1346 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
860c213b | 1347 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 JD |
1348 | |
1349 | /* | |
1350 | * Before doing the actual ring buffer flush, write up to one | |
1351 | * packet of metadata in the ring buffer. | |
1352 | */ | |
8b97fd42 | 1353 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1354 | if (ret < 0) |
1355 | goto err; | |
1356 | break; | |
1357 | } | |
606828e4 | 1358 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
9616f0bf JD |
1359 | { |
1360 | struct lttng_metadata_stream *stream = filp->private_data; | |
1361 | ||
1362 | return put_u64(stream->version, arg); | |
1363 | } | |
606828e4 | 1364 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1365 | { |
1366 | struct lttng_metadata_stream *stream = filp->private_data; | |
1367 | ||
1368 | return lttng_metadata_cache_dump(stream); | |
1369 | } | |
606828e4 | 1370 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1371 | { |
1372 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1373 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
860c213b | 1374 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
8b97fd42 MD |
1375 | |
1376 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1377 | if (ret > 0) { | |
1378 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1379 | ret = 0; | |
1380 | } else if (ret < 0) { | |
1381 | goto err; | |
1382 | } | |
1383 | break; | |
1384 | } | |
d83004aa JD |
1385 | default: |
1386 | break; | |
1387 | } | |
f613e3e6 MD |
1388 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1389 | ||
d83004aa | 1390 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1391 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1392 | if (ret < 0) |
1393 | goto err; | |
d83004aa | 1394 | |
f613e3e6 | 1395 | switch (cmd) { |
606828e4 | 1396 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1397 | { |
1398 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1399 | cmd, arg); | |
1400 | break; | |
1401 | } | |
606828e4 | 1402 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1403 | { |
1404 | return put_u32(coherent, arg); | |
1405 | } | |
f613e3e6 MD |
1406 | default: |
1407 | break; | |
1408 | } | |
d83004aa JD |
1409 | err: |
1410 | return ret; | |
1411 | } | |
1412 | ||
aeb9064d | 1413 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1414 | static |
1415 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1416 | unsigned int cmd, unsigned long arg) | |
1417 | { | |
1418 | int ret; | |
1419 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1420 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
8b97fd42 MD |
1421 | unsigned int rb_cmd; |
1422 | bool coherent; | |
1423 | ||
606828e4 MD |
1424 | if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
1425 | rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF; | |
8b97fd42 MD |
1426 | else |
1427 | rb_cmd = cmd; | |
d83004aa JD |
1428 | |
1429 | switch (cmd) { | |
606828e4 | 1430 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF: |
d83004aa | 1431 | { |
35097f36 | 1432 | struct lttng_metadata_stream *stream = filp->private_data; |
e20c0fec | 1433 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
860c213b | 1434 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
35097f36 | 1435 | |
8b97fd42 | 1436 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1437 | if (ret > 0) { |
1438 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1439 | ret = 0; | |
1440 | } else if (ret < 0) | |
d83004aa JD |
1441 | goto err; |
1442 | break; | |
1443 | } | |
606828e4 | 1444 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF: |
f613e3e6 MD |
1445 | { |
1446 | /* | |
1447 | * Random access is not allowed for metadata channel. | |
1448 | */ | |
1449 | return -ENOSYS; | |
1450 | } | |
c190d76e MJ |
1451 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY: |
1452 | lttng_fallthrough; | |
606828e4 | 1453 | case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH: |
96c55c2f MD |
1454 | { |
1455 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1456 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
860c213b | 1457 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
96c55c2f MD |
1458 | |
1459 | /* | |
1460 | * Before doing the actual ring buffer flush, write up to one | |
1461 | * packet of metadata in the ring buffer. | |
1462 | */ | |
8b97fd42 | 1463 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1464 | if (ret < 0) |
1465 | goto err; | |
1466 | break; | |
1467 | } | |
606828e4 | 1468 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION: |
96c55c2f MD |
1469 | { |
1470 | struct lttng_metadata_stream *stream = filp->private_data; | |
1471 | ||
1472 | return put_u64(stream->version, arg); | |
1473 | } | |
606828e4 | 1474 | case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP: |
d1344afa JD |
1475 | { |
1476 | struct lttng_metadata_stream *stream = filp->private_data; | |
1477 | ||
1478 | return lttng_metadata_cache_dump(stream); | |
1479 | } | |
606828e4 | 1480 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1481 | { |
1482 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1483 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
860c213b | 1484 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
8b97fd42 MD |
1485 | |
1486 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1487 | if (ret > 0) { | |
1488 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1489 | ret = 0; | |
1490 | } else if (ret < 0) { | |
1491 | goto err; | |
1492 | } | |
1493 | break; | |
1494 | } | |
d83004aa JD |
1495 | default: |
1496 | break; | |
1497 | } | |
f613e3e6 MD |
1498 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1499 | ||
d83004aa | 1500 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1501 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1502 | if (ret < 0) |
1503 | goto err; | |
d83004aa | 1504 | |
f613e3e6 | 1505 | switch (cmd) { |
606828e4 | 1506 | case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF: |
f613e3e6 MD |
1507 | { |
1508 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1509 | cmd, arg); | |
1510 | break; | |
1511 | } | |
606828e4 | 1512 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
8b97fd42 MD |
1513 | { |
1514 | return put_u32(coherent, arg); | |
1515 | } | |
f613e3e6 MD |
1516 | default: |
1517 | break; | |
1518 | } | |
d83004aa JD |
1519 | err: |
1520 | return ret; | |
1521 | } | |
aeb9064d | 1522 | #endif |
d83004aa | 1523 | |
b3b8072b MD |
1524 | /* |
1525 | * This is not used by anonymous file descriptors. This code is left | |
1526 | * there if we ever want to implement an inode with open() operation. | |
1527 | */ | |
d83004aa JD |
1528 | static |
1529 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1530 | { | |
1531 | struct lttng_metadata_stream *stream = inode->i_private; | |
e20c0fec | 1532 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1533 | |
1534 | file->private_data = buf; | |
b3b8072b MD |
1535 | /* |
1536 | * Since life-time of metadata cache differs from that of | |
1537 | * session, we need to keep our own reference on the transport. | |
1538 | */ | |
1539 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1540 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1541 | return -EBUSY; |
1542 | } | |
d83004aa JD |
1543 | return lib_ring_buffer_open(inode, file, buf); |
1544 | } | |
1545 | ||
1546 | static | |
1547 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1548 | { | |
1549 | struct lttng_metadata_stream *stream = file->private_data; | |
e20c0fec | 1550 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa | 1551 | |
92143b2c MD |
1552 | mutex_lock(&stream->metadata_cache->lock); |
1553 | list_del(&stream->list); | |
1554 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1555 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1556 | module_put(stream->transport->owner); |
92143b2c | 1557 | kfree(stream); |
d83004aa JD |
1558 | return lib_ring_buffer_release(inode, file, buf); |
1559 | } | |
1560 | ||
1561 | static | |
1562 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1563 | struct pipe_inode_info *pipe, size_t len, | |
1564 | unsigned int flags) | |
1565 | { | |
1566 | struct lttng_metadata_stream *stream = in->private_data; | |
e20c0fec | 1567 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1568 | |
1569 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1570 | flags, buf); | |
1571 | } | |
1572 | ||
1573 | static | |
1574 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1575 | struct vm_area_struct *vma) | |
1576 | { | |
1577 | struct lttng_metadata_stream *stream = filp->private_data; | |
e20c0fec | 1578 | struct lttng_kernel_ring_buffer *buf = stream->priv; |
d83004aa JD |
1579 | |
1580 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1581 | } | |
1582 | ||
1583 | static | |
1584 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1585 | .owner = THIS_MODULE, | |
1586 | .open = lttng_metadata_ring_buffer_open, | |
1587 | .release = lttng_metadata_ring_buffer_release, | |
1588 | .poll = lttng_metadata_ring_buffer_poll, | |
1589 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1590 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1591 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1592 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1593 | #ifdef CONFIG_COMPAT | |
1594 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1595 | #endif | |
1596 | }; | |
1597 | ||
1598 | static | |
1599 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1600 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1601 | { |
ad1c05e1 | 1602 | int stream_fd, ret; |
11b5a3c2 | 1603 | struct file *stream_file; |
ad1c05e1 | 1604 | |
2a059b14 | 1605 | stream_fd = get_unused_fd_flags(0); |
ad1c05e1 MD |
1606 | if (stream_fd < 0) { |
1607 | ret = stream_fd; | |
1608 | goto fd_error; | |
1609 | } | |
a3fcd499 | 1610 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1611 | if (IS_ERR(stream_file)) { |
1612 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1613 | goto file_error; |
1614 | } | |
409453cb MD |
1615 | /* |
1616 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1617 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1618 | * file descriptor, so we set FMODE_PREAD here. | |
1619 | */ | |
d7b6f197 | 1620 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1621 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1622 | /* |
1623 | * The stream holds a reference to the channel within the generic ring | |
1624 | * buffer library, so no need to hold a refcount on the channel and | |
1625 | * session files here. | |
1626 | */ | |
ad1c05e1 MD |
1627 | return stream_fd; |
1628 | ||
1629 | file_error: | |
1630 | put_unused_fd(stream_fd); | |
d83004aa JD |
1631 | fd_error: |
1632 | return ret; | |
1633 | } | |
1634 | ||
1635 | static | |
1636 | int lttng_abi_open_stream(struct file *channel_file) | |
1637 | { | |
f7d06400 | 1638 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
e20c0fec | 1639 | struct lttng_kernel_ring_buffer *buf; |
d83004aa JD |
1640 | int ret; |
1641 | void *stream_priv; | |
1642 | ||
f7d06400 | 1643 | buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan); |
d83004aa JD |
1644 | if (!buf) |
1645 | return -ENOENT; | |
1646 | ||
1647 | stream_priv = buf; | |
1648 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1649 | <tng_stream_ring_buffer_file_operations, |
1650 | "[lttng_stream]"); | |
d83004aa JD |
1651 | if (ret < 0) |
1652 | goto fd_error; | |
1653 | ||
1654 | return ret; | |
1655 | ||
1656 | fd_error: | |
4a399b76 | 1657 | channel->ops->priv->buffer_read_close(buf); |
d83004aa JD |
1658 | return ret; |
1659 | } | |
1660 | ||
1661 | static | |
1662 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1663 | { | |
f7d06400 MD |
1664 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
1665 | struct lttng_kernel_session *session = channel->parent.session; | |
e20c0fec | 1666 | struct lttng_kernel_ring_buffer *buf; |
d83004aa JD |
1667 | int ret; |
1668 | struct lttng_metadata_stream *metadata_stream; | |
1669 | void *stream_priv; | |
1670 | ||
f7d06400 | 1671 | buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan); |
d83004aa JD |
1672 | if (!buf) |
1673 | return -ENOENT; | |
1674 | ||
1675 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1676 | GFP_KERNEL); | |
b3b8072b MD |
1677 | if (!metadata_stream) { |
1678 | ret = -ENOMEM; | |
1679 | goto nomem; | |
1680 | } | |
8cdc1a81 | 1681 | metadata_stream->metadata_cache = session->priv->metadata_cache; |
d83004aa JD |
1682 | init_waitqueue_head(&metadata_stream->read_wait); |
1683 | metadata_stream->priv = buf; | |
1684 | stream_priv = metadata_stream; | |
f7d06400 | 1685 | metadata_stream->transport = channel->priv->transport; |
8b97fd42 MD |
1686 | /* Initial state is an empty metadata, considered as incoherent. */ |
1687 | metadata_stream->coherent = false; | |
b3b8072b MD |
1688 | |
1689 | /* | |
1690 | * Since life-time of metadata cache differs from that of | |
1691 | * session, we need to keep our own reference on the transport. | |
1692 | */ | |
1693 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1694 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1695 | ret = -EINVAL; |
1696 | goto notransport; | |
1697 | } | |
1698 | ||
8cdc1a81 | 1699 | if (!lttng_kref_get(&session->priv->metadata_cache->refcount)) { |
901aaa5f | 1700 | ret = -EOVERFLOW; |
9c1f4643 | 1701 | goto kref_error; |
901aaa5f FD |
1702 | } |
1703 | ||
d83004aa | 1704 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1705 | <tng_metadata_ring_buffer_file_operations, |
1706 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1707 | if (ret < 0) |
1708 | goto fd_error; | |
1709 | ||
8cdc1a81 | 1710 | mutex_lock(&session->priv->metadata_cache->lock); |
d83004aa | 1711 | list_add(&metadata_stream->list, |
8cdc1a81 MD |
1712 | &session->priv->metadata_cache->metadata_stream); |
1713 | mutex_unlock(&session->priv->metadata_cache->lock); | |
d83004aa JD |
1714 | return ret; |
1715 | ||
ad1c05e1 | 1716 | fd_error: |
8cdc1a81 | 1717 | kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); |
9c1f4643 | 1718 | kref_error: |
b3b8072b MD |
1719 | module_put(metadata_stream->transport->owner); |
1720 | notransport: | |
1721 | kfree(metadata_stream); | |
1722 | nomem: | |
4a399b76 | 1723 | channel->ops->priv->buffer_read_close(buf); |
ad1c05e1 MD |
1724 | return ret; |
1725 | } | |
1726 | ||
21f58fb7 FD |
1727 | static |
1728 | int lttng_abi_open_event_notifier_group_stream(struct file *notif_file) | |
1729 | { | |
1730 | struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data; | |
860c213b | 1731 | struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan; |
e20c0fec | 1732 | struct lttng_kernel_ring_buffer *buf; |
21f58fb7 FD |
1733 | int ret; |
1734 | void *stream_priv; | |
1735 | ||
4a399b76 | 1736 | buf = event_notifier_group->ops->priv->buffer_read_open(chan); |
21f58fb7 FD |
1737 | if (!buf) |
1738 | return -ENOENT; | |
1739 | ||
1740 | /* The event_notifier notification fd holds a reference on the event_notifier group */ | |
1741 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1742 | ret = -EOVERFLOW; | |
1743 | goto refcount_error; | |
1744 | } | |
1745 | event_notifier_group->buf = buf; | |
1746 | stream_priv = event_notifier_group; | |
1747 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1748 | <tng_event_notifier_group_notif_fops, | |
1749 | "[lttng_event_notifier_stream]"); | |
1750 | if (ret < 0) | |
1751 | goto fd_error; | |
1752 | ||
1753 | return ret; | |
1754 | ||
1755 | fd_error: | |
1756 | atomic_long_dec(¬if_file->f_count); | |
1757 | refcount_error: | |
4a399b76 | 1758 | event_notifier_group->ops->priv->buffer_read_close(buf); |
21f58fb7 FD |
1759 | return ret; |
1760 | } | |
1761 | ||
badfe9f5 | 1762 | static |
606828e4 | 1763 | int lttng_abi_validate_event_param(struct lttng_kernel_abi_event *event_param) |
badfe9f5 MD |
1764 | { |
1765 | /* Limit ABI to implemented features. */ | |
1766 | switch (event_param->instrumentation) { | |
606828e4 | 1767 | case LTTNG_KERNEL_ABI_SYSCALL: |
badfe9f5 | 1768 | switch (event_param->u.syscall.entryexit) { |
c190d76e MJ |
1769 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
1770 | lttng_fallthrough; | |
1771 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: | |
1772 | lttng_fallthrough; | |
606828e4 | 1773 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
badfe9f5 MD |
1774 | break; |
1775 | default: | |
1776 | return -EINVAL; | |
1777 | } | |
1778 | switch (event_param->u.syscall.abi) { | |
606828e4 | 1779 | case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL: |
badfe9f5 MD |
1780 | break; |
1781 | default: | |
1782 | return -EINVAL; | |
1783 | } | |
1784 | switch (event_param->u.syscall.match) { | |
606828e4 | 1785 | case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME: |
badfe9f5 MD |
1786 | break; |
1787 | default: | |
1788 | return -EINVAL; | |
1789 | } | |
1790 | break; | |
1791 | ||
606828e4 | 1792 | case LTTNG_KERNEL_ABI_KRETPROBE: |
88a82b17 | 1793 | switch (event_param->u.kretprobe.entryexit) { |
606828e4 | 1794 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT: |
88a82b17 | 1795 | break; |
c190d76e MJ |
1796 | case LTTNG_KERNEL_ABI_SYSCALL_ENTRY: |
1797 | lttng_fallthrough; | |
1798 | case LTTNG_KERNEL_ABI_SYSCALL_EXIT: | |
1799 | lttng_fallthrough; | |
88a82b17 MD |
1800 | default: |
1801 | return -EINVAL; | |
1802 | } | |
1803 | break; | |
1804 | ||
c190d76e MJ |
1805 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1806 | lttng_fallthrough; | |
1807 | case LTTNG_KERNEL_ABI_KPROBE: | |
1808 | lttng_fallthrough; | |
606828e4 | 1809 | case LTTNG_KERNEL_ABI_UPROBE: |
badfe9f5 MD |
1810 | break; |
1811 | ||
c190d76e MJ |
1812 | case LTTNG_KERNEL_ABI_FUNCTION: |
1813 | lttng_fallthrough; | |
1814 | case LTTNG_KERNEL_ABI_NOOP: | |
1815 | lttng_fallthrough; | |
badfe9f5 MD |
1816 | default: |
1817 | return -EINVAL; | |
1818 | } | |
1819 | return 0; | |
1820 | } | |
1821 | ||
653fe716 | 1822 | static |
c0e31d2e | 1823 | int lttng_abi_create_event(struct file *channel_file, |
606828e4 | 1824 | struct lttng_kernel_abi_event *event_param) |
653fe716 | 1825 | { |
ef784b4d | 1826 | const struct file_operations *fops; |
f7d06400 | 1827 | struct lttng_kernel_channel_buffer *channel = channel_file->private_data; |
653fe716 | 1828 | int event_fd, ret; |
11b5a3c2 | 1829 | struct file *event_file; |
3c997079 | 1830 | void *priv; |
653fe716 | 1831 | |
606828e4 | 1832 | event_param->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
6dccd6c1 | 1833 | switch (event_param->instrumentation) { |
606828e4 MD |
1834 | case LTTNG_KERNEL_ABI_KRETPROBE: |
1835 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
7371f44c | 1836 | break; |
606828e4 MD |
1837 | case LTTNG_KERNEL_ABI_KPROBE: |
1838 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
e0a7a7c4 | 1839 | break; |
606828e4 | 1840 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
1841 | WARN_ON_ONCE(1); |
1842 | /* Not implemented. */ | |
e0a7a7c4 MD |
1843 | break; |
1844 | default: | |
1845 | break; | |
1846 | } | |
ef784b4d MD |
1847 | |
1848 | switch (event_param->instrumentation) { | |
c190d76e MJ |
1849 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1850 | lttng_fallthrough; | |
ef784b4d MD |
1851 | case LTTNG_KERNEL_ABI_SYSCALL: |
1852 | fops = <tng_event_recorder_enabler_fops; | |
1853 | break; | |
c190d76e MJ |
1854 | case LTTNG_KERNEL_ABI_KPROBE: |
1855 | lttng_fallthrough; | |
1856 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1857 | lttng_fallthrough; | |
ef784b4d MD |
1858 | case LTTNG_KERNEL_ABI_UPROBE: |
1859 | fops = <tng_event_recorder_event_fops; | |
1860 | break; | |
1861 | ||
c190d76e MJ |
1862 | case LTTNG_KERNEL_ABI_FUNCTION: |
1863 | lttng_fallthrough; | |
1864 | case LTTNG_KERNEL_ABI_NOOP: | |
1865 | lttng_fallthrough; | |
ef784b4d MD |
1866 | default: |
1867 | return -EINVAL; | |
1868 | } | |
1869 | ||
2a059b14 | 1870 | event_fd = get_unused_fd_flags(0); |
33a39a3c MD |
1871 | if (event_fd < 0) { |
1872 | ret = event_fd; | |
1873 | goto fd_error; | |
1874 | } | |
1875 | event_file = anon_inode_getfile("[lttng_event]", | |
ef784b4d | 1876 | fops, NULL, O_RDWR); |
33a39a3c MD |
1877 | if (IS_ERR(event_file)) { |
1878 | ret = PTR_ERR(event_file); | |
1879 | goto file_error; | |
1880 | } | |
9c1f4643 | 1881 | /* The event holds a reference on the channel */ |
98d7281c | 1882 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1883 | ret = -EOVERFLOW; |
9c1f4643 MD |
1884 | goto refcount_error; |
1885 | } | |
badfe9f5 MD |
1886 | ret = lttng_abi_validate_event_param(event_param); |
1887 | if (ret) | |
1888 | goto event_error; | |
684a1e4d MD |
1889 | |
1890 | switch (event_param->instrumentation) { | |
c190d76e MJ |
1891 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
1892 | lttng_fallthrough; | |
606828e4 | 1893 | case LTTNG_KERNEL_ABI_SYSCALL: |
684a1e4d | 1894 | { |
1ae083ba | 1895 | struct lttng_event_recorder_enabler *event_enabler; |
33a39a3c | 1896 | |
4993071a PP |
1897 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1898 | /* | |
1899 | * If the event name is a star globbing pattern, | |
1900 | * we create the special star globbing enabler. | |
1901 | */ | |
1ae083ba | 1902 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1903 | event_param, channel); |
3c997079 | 1904 | } else { |
1ae083ba | 1905 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1906 | event_param, channel); |
1ec65de1 | 1907 | } |
def1e304 MD |
1908 | if (event_enabler) |
1909 | lttng_event_enabler_session_add(channel->parent.session, event_enabler); | |
b2bc0bc8 | 1910 | priv = event_enabler; |
684a1e4d MD |
1911 | break; |
1912 | } | |
1913 | ||
c190d76e MJ |
1914 | case LTTNG_KERNEL_ABI_KPROBE: |
1915 | lttng_fallthrough; | |
1916 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
1917 | lttng_fallthrough; | |
606828e4 | 1918 | case LTTNG_KERNEL_ABI_UPROBE: |
684a1e4d | 1919 | { |
83006ee0 | 1920 | struct lttng_kernel_event_common *event; |
1ae083ba | 1921 | struct lttng_event_recorder_enabler *event_enabler; |
4ee2453d | 1922 | |
1ae083ba | 1923 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
def1e304 MD |
1924 | event_param, channel); |
1925 | if (!event_enabler) { | |
1926 | ret = -ENOMEM; | |
1927 | goto event_error; | |
1928 | } | |
33a39a3c MD |
1929 | /* |
1930 | * We tolerate no failure path after event creation. It | |
1931 | * will stay invariant for the rest of the session. | |
1932 | */ | |
83006ee0 | 1933 | event = lttng_kernel_event_create(&event_enabler->parent, NULL); |
c3fb484e | 1934 | WARN_ON_ONCE(IS_ERR(event)); |
44b1abdc | 1935 | lttng_event_enabler_destroy(&event_enabler->parent); |
33a39a3c MD |
1936 | if (IS_ERR(event)) { |
1937 | ret = PTR_ERR(event); | |
1938 | goto event_error; | |
80f87dd2 | 1939 | } |
83006ee0 | 1940 | priv = container_of(event, struct lttng_kernel_event_recorder, parent); |
684a1e4d MD |
1941 | break; |
1942 | } | |
1943 | ||
c190d76e MJ |
1944 | case LTTNG_KERNEL_ABI_FUNCTION: |
1945 | lttng_fallthrough; | |
1946 | case LTTNG_KERNEL_ABI_NOOP: | |
1947 | lttng_fallthrough; | |
684a1e4d MD |
1948 | default: |
1949 | ret = -EINVAL; | |
1950 | goto event_error; | |
03037b98 | 1951 | } |
33a39a3c MD |
1952 | event_file->private_data = priv; |
1953 | fd_install(event_fd, event_file); | |
653fe716 MD |
1954 | return event_fd; |
1955 | ||
03037b98 | 1956 | event_error: |
9c1f4643 MD |
1957 | atomic_long_dec(&channel_file->f_count); |
1958 | refcount_error: | |
c0e31d2e | 1959 | fput(event_file); |
653fe716 MD |
1960 | file_error: |
1961 | put_unused_fd(event_fd); | |
1962 | fd_error: | |
653fe716 MD |
1963 | return ret; |
1964 | } | |
ad1c05e1 | 1965 | |
dffef45d | 1966 | static |
ef784b4d | 1967 | long lttng_event_notifier_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1968 | { |
a67ba386 | 1969 | struct lttng_kernel_event_notifier *event_notifier = file->private_data; |
dffef45d FD |
1970 | |
1971 | switch (cmd) { | |
606828e4 | 1972 | case LTTNG_KERNEL_ABI_ENABLE: |
9d993668 | 1973 | return lttng_event_enable(&event_notifier->parent); |
606828e4 | 1974 | case LTTNG_KERNEL_ABI_DISABLE: |
9d993668 | 1975 | return lttng_event_disable(&event_notifier->parent); |
606828e4 | 1976 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 1977 | return -EINVAL; |
606828e4 | 1978 | case LTTNG_KERNEL_ABI_CAPTURE: |
ef784b4d | 1979 | return -EINVAL; |
606828e4 | 1980 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
e2d5dbc7 | 1981 | return lttng_event_add_callsite(&event_notifier->parent, |
ef784b4d | 1982 | (struct lttng_kernel_abi_event_callsite __user *) arg); |
dffef45d FD |
1983 | default: |
1984 | return -ENOIOCTLCMD; | |
1985 | } | |
1986 | } | |
1987 | ||
1988 | static | |
ef784b4d | 1989 | long lttng_event_notifier_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
dffef45d | 1990 | { |
ef784b4d | 1991 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; |
dffef45d | 1992 | |
ef784b4d MD |
1993 | switch (cmd) { |
1994 | case LTTNG_KERNEL_ABI_ENABLE: | |
7b25ab0e | 1995 | return lttng_event_enabler_enable(&event_notifier_enabler->parent); |
ef784b4d | 1996 | case LTTNG_KERNEL_ABI_DISABLE: |
7b25ab0e | 1997 | return lttng_event_enabler_disable(&event_notifier_enabler->parent); |
ef784b4d | 1998 | case LTTNG_KERNEL_ABI_FILTER: |
6048044f | 1999 | return lttng_event_enabler_attach_filter_bytecode(&event_notifier_enabler->parent, |
ef784b4d MD |
2000 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); |
2001 | case LTTNG_KERNEL_ABI_CAPTURE: | |
2002 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
2003 | event_notifier_enabler, | |
2004 | (struct lttng_kernel_abi_capture_bytecode __user *) arg); | |
2005 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
2006 | return -EINVAL; | |
dffef45d | 2007 | default: |
ef784b4d | 2008 | return -ENOIOCTLCMD; |
dffef45d | 2009 | } |
ef784b4d | 2010 | } |
dffef45d | 2011 | |
ef784b4d MD |
2012 | static |
2013 | int lttng_event_notifier_event_release(struct inode *inode, struct file *file) | |
2014 | { | |
a67ba386 | 2015 | struct lttng_kernel_event_notifier *event_notifier = file->private_data; |
ef784b4d MD |
2016 | |
2017 | if (event_notifier) | |
a67ba386 | 2018 | fput(event_notifier->priv->group->file); |
dffef45d FD |
2019 | return 0; |
2020 | } | |
2021 | ||
ef784b4d MD |
2022 | static |
2023 | int lttng_event_notifier_enabler_release(struct inode *inode, struct file *file) | |
2024 | { | |
2025 | struct lttng_event_notifier_enabler *event_notifier_enabler = file->private_data; | |
2026 | ||
2027 | if (event_notifier_enabler) | |
2028 | fput(event_notifier_enabler->group->file); | |
2029 | return 0; | |
2030 | } | |
2031 | ||
2032 | static const struct file_operations lttng_event_notifier_event_fops = { | |
2033 | .owner = THIS_MODULE, | |
2034 | .release = lttng_event_notifier_event_release, | |
2035 | .unlocked_ioctl = lttng_event_notifier_event_ioctl, | |
2036 | #ifdef CONFIG_COMPAT | |
2037 | .compat_ioctl = lttng_event_notifier_event_ioctl, | |
2038 | #endif | |
2039 | }; | |
2040 | ||
2041 | static const struct file_operations lttng_event_notifier_enabler_fops = { | |
dffef45d | 2042 | .owner = THIS_MODULE, |
ef784b4d MD |
2043 | .release = lttng_event_notifier_enabler_release, |
2044 | .unlocked_ioctl = lttng_event_notifier_enabler_ioctl, | |
dffef45d | 2045 | #ifdef CONFIG_COMPAT |
ef784b4d | 2046 | .compat_ioctl = lttng_event_notifier_enabler_ioctl, |
dffef45d FD |
2047 | #endif |
2048 | }; | |
2049 | ||
2050 | static | |
2051 | int lttng_abi_create_event_notifier(struct file *event_notifier_group_file, | |
606828e4 | 2052 | struct lttng_kernel_abi_event_notifier *event_notifier_param) |
dffef45d FD |
2053 | { |
2054 | struct lttng_event_notifier_group *event_notifier_group = | |
2055 | event_notifier_group_file->private_data; | |
ef784b4d | 2056 | const struct file_operations *fops; |
dffef45d FD |
2057 | int event_notifier_fd, ret; |
2058 | struct file *event_notifier_file; | |
2059 | void *priv; | |
2060 | ||
2061 | switch (event_notifier_param->event.instrumentation) { | |
606828e4 MD |
2062 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2063 | case LTTNG_KERNEL_ABI_UPROBE: | |
b01155ba | 2064 | break; |
606828e4 MD |
2065 | case LTTNG_KERNEL_ABI_KPROBE: |
2066 | event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
2b16f0c9 | 2067 | break; |
606828e4 | 2068 | case LTTNG_KERNEL_ABI_SYSCALL: |
8a8ac9a8 | 2069 | break; |
606828e4 | 2070 | case LTTNG_KERNEL_ABI_KRETPROBE: |
9de67196 | 2071 | /* Placing an event notifier on kretprobe is not supported. */ |
606828e4 MD |
2072 | case LTTNG_KERNEL_ABI_FUNCTION: |
2073 | case LTTNG_KERNEL_ABI_NOOP: | |
dffef45d FD |
2074 | default: |
2075 | ret = -EINVAL; | |
2076 | goto inval_instr; | |
2077 | } | |
2078 | ||
ef784b4d | 2079 | switch (event_notifier_param->event.instrumentation) { |
c190d76e MJ |
2080 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2081 | lttng_fallthrough; | |
ef784b4d MD |
2082 | case LTTNG_KERNEL_ABI_SYSCALL: |
2083 | fops = <tng_event_notifier_enabler_fops; | |
2084 | break; | |
c190d76e MJ |
2085 | case LTTNG_KERNEL_ABI_KPROBE: |
2086 | lttng_fallthrough; | |
2087 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
2088 | lttng_fallthrough; | |
ef784b4d MD |
2089 | case LTTNG_KERNEL_ABI_UPROBE: |
2090 | fops = <tng_event_notifier_event_fops; | |
2091 | break; | |
2092 | ||
c190d76e MJ |
2093 | case LTTNG_KERNEL_ABI_FUNCTION: |
2094 | lttng_fallthrough; | |
2095 | case LTTNG_KERNEL_ABI_NOOP: | |
2096 | lttng_fallthrough; | |
ef784b4d MD |
2097 | default: |
2098 | ret = -EINVAL; | |
2099 | goto inval_instr; | |
2100 | } | |
2101 | ||
606828e4 | 2102 | event_notifier_param->event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
dffef45d | 2103 | |
2a059b14 | 2104 | event_notifier_fd = get_unused_fd_flags(0); |
dffef45d FD |
2105 | if (event_notifier_fd < 0) { |
2106 | ret = event_notifier_fd; | |
2107 | goto fd_error; | |
2108 | } | |
2109 | ||
2110 | event_notifier_file = anon_inode_getfile("[lttng_event_notifier]", | |
ef784b4d | 2111 | fops, NULL, O_RDWR); |
dffef45d FD |
2112 | if (IS_ERR(event_notifier_file)) { |
2113 | ret = PTR_ERR(event_notifier_file); | |
2114 | goto file_error; | |
2115 | } | |
2116 | ||
2117 | /* The event notifier holds a reference on the event notifier group. */ | |
2118 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2119 | ret = -EOVERFLOW; | |
2120 | goto refcount_error; | |
2121 | } | |
2122 | ||
56237619 MD |
2123 | ret = lttng_abi_validate_event_param(&event_notifier_param->event); |
2124 | if (ret) | |
2125 | goto event_notifier_error; | |
2126 | ||
684a1e4d | 2127 | switch (event_notifier_param->event.instrumentation) { |
c190d76e MJ |
2128 | case LTTNG_KERNEL_ABI_TRACEPOINT: |
2129 | lttng_fallthrough; | |
606828e4 | 2130 | case LTTNG_KERNEL_ABI_SYSCALL: |
684a1e4d | 2131 | { |
dffef45d FD |
2132 | struct lttng_event_notifier_enabler *enabler; |
2133 | ||
2134 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
2135 | /* | |
2136 | * If the event name is a star globbing pattern, | |
2137 | * we create the special star globbing enabler. | |
2138 | */ | |
2139 | enabler = lttng_event_notifier_enabler_create( | |
dffef45d | 2140 | LTTNG_ENABLER_FORMAT_STAR_GLOB, |
1bbb5b2d MD |
2141 | event_notifier_param, |
2142 | event_notifier_group); | |
dffef45d FD |
2143 | } else { |
2144 | enabler = lttng_event_notifier_enabler_create( | |
dffef45d | 2145 | LTTNG_ENABLER_FORMAT_NAME, |
1bbb5b2d MD |
2146 | event_notifier_param, |
2147 | event_notifier_group); | |
dffef45d | 2148 | } |
1bbb5b2d MD |
2149 | if (enabler) |
2150 | lttng_event_notifier_enabler_group_add(event_notifier_group, enabler); | |
dffef45d | 2151 | priv = enabler; |
684a1e4d MD |
2152 | break; |
2153 | } | |
2154 | ||
c190d76e MJ |
2155 | case LTTNG_KERNEL_ABI_KPROBE: |
2156 | lttng_fallthrough; | |
2157 | case LTTNG_KERNEL_ABI_KRETPROBE: | |
2158 | lttng_fallthrough; | |
606828e4 | 2159 | case LTTNG_KERNEL_ABI_UPROBE: |
684a1e4d | 2160 | { |
83006ee0 | 2161 | struct lttng_kernel_event_common *event; |
1bbb5b2d | 2162 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
dffef45d | 2163 | |
1bbb5b2d MD |
2164 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
2165 | event_notifier_param, event_notifier_group); | |
2166 | if (!event_notifier_enabler) { | |
2167 | ret = -ENOMEM; | |
2168 | goto event_notifier_error; | |
2169 | } | |
83006ee0 | 2170 | event = lttng_kernel_event_create(&event_notifier_enabler->parent, NULL); |
c3fb484e | 2171 | WARN_ON_ONCE(IS_ERR(event)); |
1bbb5b2d | 2172 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
83006ee0 MD |
2173 | if (IS_ERR(event)) { |
2174 | ret = PTR_ERR(event); | |
dffef45d FD |
2175 | goto event_notifier_error; |
2176 | } | |
83006ee0 | 2177 | priv = container_of(event, struct lttng_kernel_event_notifier, parent); |
684a1e4d MD |
2178 | break; |
2179 | } | |
2180 | ||
c190d76e MJ |
2181 | case LTTNG_KERNEL_ABI_FUNCTION: |
2182 | lttng_fallthrough; | |
2183 | case LTTNG_KERNEL_ABI_NOOP: | |
2184 | lttng_fallthrough; | |
684a1e4d MD |
2185 | default: |
2186 | ret = -EINVAL; | |
2187 | goto event_notifier_error; | |
dffef45d FD |
2188 | } |
2189 | event_notifier_file->private_data = priv; | |
2190 | fd_install(event_notifier_fd, event_notifier_file); | |
2191 | return event_notifier_fd; | |
2192 | ||
2193 | event_notifier_error: | |
2194 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2195 | refcount_error: | |
2196 | fput(event_notifier_file); | |
2197 | file_error: | |
2198 | put_unused_fd(event_notifier_fd); | |
2199 | fd_error: | |
2200 | inval_instr: | |
2201 | return ret; | |
2202 | } | |
2203 | ||
99f52fcc FD |
2204 | static |
2205 | long lttng_abi_event_notifier_group_create_error_counter( | |
2206 | struct file *event_notifier_group_file, | |
606828e4 | 2207 | const struct lttng_kernel_abi_counter_conf *error_counter_conf) |
99f52fcc FD |
2208 | { |
2209 | int counter_fd, ret; | |
2210 | char *counter_transport_name; | |
2211 | size_t counter_len; | |
2212 | struct lttng_counter *counter = NULL; | |
2213 | struct file *counter_file; | |
2214 | struct lttng_event_notifier_group *event_notifier_group = | |
2215 | (struct lttng_event_notifier_group *) event_notifier_group_file->private_data; | |
2216 | ||
606828e4 | 2217 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR) { |
99f52fcc FD |
2218 | printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n"); |
2219 | return -EINVAL; | |
2220 | } | |
2221 | ||
2222 | if (error_counter_conf->number_dimensions != 1) { | |
2223 | printk(KERN_ERR "LTTng: event_notifier: Error counter has more than one dimension.\n"); | |
2224 | return -EINVAL; | |
2225 | } | |
2226 | ||
2227 | switch (error_counter_conf->bitness) { | |
606828e4 | 2228 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64: |
99f52fcc FD |
2229 | counter_transport_name = "counter-per-cpu-64-modular"; |
2230 | break; | |
606828e4 | 2231 | case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32: |
99f52fcc FD |
2232 | counter_transport_name = "counter-per-cpu-32-modular"; |
2233 | break; | |
2234 | default: | |
2235 | return -EINVAL; | |
2236 | } | |
2237 | ||
2238 | /* | |
2239 | * Lock sessions to provide mutual exclusion against concurrent | |
2240 | * modification of event_notifier group, which would result in | |
2241 | * overwriting the error counter if set concurrently. | |
2242 | */ | |
2243 | lttng_lock_sessions(); | |
2244 | ||
2245 | if (event_notifier_group->error_counter) { | |
2246 | printk(KERN_ERR "Error counter already created in event_notifier group\n"); | |
2247 | ret = -EBUSY; | |
2248 | goto fd_error; | |
2249 | } | |
2250 | ||
2a059b14 | 2251 | counter_fd = get_unused_fd_flags(0); |
99f52fcc FD |
2252 | if (counter_fd < 0) { |
2253 | ret = counter_fd; | |
2254 | goto fd_error; | |
2255 | } | |
2256 | ||
2257 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2258 | <tng_counter_fops, | |
2259 | NULL, O_RDONLY); | |
2260 | if (IS_ERR(counter_file)) { | |
2261 | ret = PTR_ERR(counter_file); | |
2262 | goto file_error; | |
2263 | } | |
2264 | ||
2265 | counter_len = error_counter_conf->dimensions[0].size; | |
2266 | ||
2267 | if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) { | |
2268 | ret = -EOVERFLOW; | |
2269 | goto refcount_error; | |
2270 | } | |
2271 | ||
2272 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2273 | 1, &counter_len); | |
2274 | if (!counter) { | |
2275 | ret = -EINVAL; | |
2276 | goto counter_error; | |
2277 | } | |
2278 | ||
99f52fcc | 2279 | event_notifier_group->error_counter_len = counter_len; |
ab04d7b1 MD |
2280 | /* |
2281 | * store-release to publish error counter matches load-acquire | |
2282 | * in record_error. Ensures the counter is created and the | |
2283 | * error_counter_len is set before they are used. | |
2284 | */ | |
a27c8df7 | 2285 | smp_store_release(&event_notifier_group->error_counter, counter); |
99f52fcc FD |
2286 | |
2287 | counter->file = counter_file; | |
2288 | counter->owner = event_notifier_group->file; | |
2289 | counter_file->private_data = counter; | |
2290 | /* Ownership transferred. */ | |
2291 | counter = NULL; | |
2292 | ||
2293 | fd_install(counter_fd, counter_file); | |
2294 | lttng_unlock_sessions(); | |
2295 | ||
2296 | return counter_fd; | |
2297 | ||
2298 | counter_error: | |
2299 | atomic_long_dec(&event_notifier_group_file->f_count); | |
2300 | refcount_error: | |
2301 | fput(counter_file); | |
2302 | file_error: | |
2303 | put_unused_fd(counter_fd); | |
2304 | fd_error: | |
2305 | lttng_unlock_sessions(); | |
2306 | return ret; | |
2307 | } | |
2308 | ||
750b05f2 FD |
2309 | static |
2310 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
2311 | unsigned long arg) | |
2312 | { | |
2313 | switch (cmd) { | |
606828e4 | 2314 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD: |
21f58fb7 FD |
2315 | { |
2316 | return lttng_abi_open_event_notifier_group_stream(file); | |
2317 | } | |
606828e4 | 2318 | case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE: |
dffef45d | 2319 | { |
606828e4 | 2320 | struct lttng_kernel_abi_event_notifier uevent_notifier_param; |
dffef45d FD |
2321 | |
2322 | if (copy_from_user(&uevent_notifier_param, | |
606828e4 | 2323 | (struct lttng_kernel_abi_event_notifier __user *) arg, |
dffef45d FD |
2324 | sizeof(uevent_notifier_param))) |
2325 | return -EFAULT; | |
2326 | return lttng_abi_create_event_notifier(file, &uevent_notifier_param); | |
2327 | } | |
606828e4 | 2328 | case LTTNG_KERNEL_ABI_COUNTER: |
99f52fcc | 2329 | { |
606828e4 | 2330 | struct lttng_kernel_abi_counter_conf uerror_counter_conf; |
99f52fcc FD |
2331 | |
2332 | if (copy_from_user(&uerror_counter_conf, | |
606828e4 | 2333 | (struct lttng_kernel_abi_counter_conf __user *) arg, |
99f52fcc FD |
2334 | sizeof(uerror_counter_conf))) |
2335 | return -EFAULT; | |
2336 | return lttng_abi_event_notifier_group_create_error_counter(file, | |
2337 | &uerror_counter_conf); | |
2338 | } | |
750b05f2 FD |
2339 | default: |
2340 | return -ENOIOCTLCMD; | |
2341 | } | |
2342 | return 0; | |
2343 | } | |
2344 | ||
2345 | static | |
2346 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
2347 | { | |
2348 | struct lttng_event_notifier_group *event_notifier_group = | |
2349 | file->private_data; | |
2350 | ||
2351 | if (event_notifier_group) | |
2352 | lttng_event_notifier_group_destroy(event_notifier_group); | |
2353 | return 0; | |
2354 | } | |
2355 | ||
2356 | static const struct file_operations lttng_event_notifier_group_fops = { | |
2357 | .owner = THIS_MODULE, | |
2358 | .release = lttng_event_notifier_group_release, | |
2359 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
2360 | #ifdef CONFIG_COMPAT | |
2361 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
2362 | #endif | |
2363 | }; | |
2364 | ||
ad1c05e1 MD |
2365 | /** |
2366 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2367 | * | |
c0e31d2e | 2368 | * @file: the file |
ad1c05e1 MD |
2369 | * @cmd: the command |
2370 | * @arg: command arg | |
2371 | * | |
2372 | * This ioctl implements lttng commands: | |
606828e4 | 2373 | * LTTNG_KERNEL_ABI_STREAM |
ad1c05e1 MD |
2374 | * Returns an event stream file descriptor or failure. |
2375 | * (typically, one event stream records events from one CPU) | |
606828e4 | 2376 | * LTTNG_KERNEL_ABI_EVENT |
ad1c05e1 | 2377 | * Returns an event file descriptor or failure. |
606828e4 | 2378 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2379 | * Prepend a context field to each event in the channel |
606828e4 | 2380 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2381 | * Enable recording for events in this channel (weak enable) |
606828e4 | 2382 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2383 | * Disable recording for events in this channel (strong disable) |
baf20995 | 2384 | * |
baf20995 MD |
2385 | * Channel and event file descriptors also hold a reference on the session. |
2386 | */ | |
ad1c05e1 | 2387 | static |
c0e31d2e | 2388 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2389 | { |
f7d06400 | 2390 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
8070f5c0 | 2391 | |
baf20995 | 2392 | switch (cmd) { |
606828e4 MD |
2393 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2394 | case LTTNG_KERNEL_ABI_STREAM: | |
c0e31d2e | 2395 | return lttng_abi_open_stream(file); |
606828e4 | 2396 | case LTTNG_KERNEL_ABI_OLD_EVENT: |
6dccd6c1 | 2397 | { |
606828e4 MD |
2398 | struct lttng_kernel_abi_event *uevent_param; |
2399 | struct lttng_kernel_abi_old_event *old_uevent_param; | |
6dccd6c1 JD |
2400 | int ret; |
2401 | ||
606828e4 | 2402 | uevent_param = kmalloc(sizeof(struct lttng_kernel_abi_event), |
6dccd6c1 JD |
2403 | GFP_KERNEL); |
2404 | if (!uevent_param) { | |
2405 | ret = -ENOMEM; | |
2406 | goto old_event_end; | |
2407 | } | |
2408 | old_uevent_param = kmalloc( | |
606828e4 | 2409 | sizeof(struct lttng_kernel_abi_old_event), |
6dccd6c1 JD |
2410 | GFP_KERNEL); |
2411 | if (!old_uevent_param) { | |
2412 | ret = -ENOMEM; | |
2413 | goto old_event_error_free_param; | |
2414 | } | |
2415 | if (copy_from_user(old_uevent_param, | |
606828e4 MD |
2416 | (struct lttng_kernel_abi_old_event __user *) arg, |
2417 | sizeof(struct lttng_kernel_abi_old_event))) { | |
6dccd6c1 JD |
2418 | ret = -EFAULT; |
2419 | goto old_event_error_free_old_param; | |
2420 | } | |
2421 | ||
2422 | memcpy(uevent_param->name, old_uevent_param->name, | |
2423 | sizeof(uevent_param->name)); | |
2424 | uevent_param->instrumentation = | |
2425 | old_uevent_param->instrumentation; | |
2426 | ||
2427 | switch (old_uevent_param->instrumentation) { | |
606828e4 | 2428 | case LTTNG_KERNEL_ABI_KPROBE: |
6dccd6c1 JD |
2429 | uevent_param->u.kprobe.addr = |
2430 | old_uevent_param->u.kprobe.addr; | |
2431 | uevent_param->u.kprobe.offset = | |
2432 | old_uevent_param->u.kprobe.offset; | |
2433 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2434 | old_uevent_param->u.kprobe.symbol_name, | |
2435 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2436 | break; | |
606828e4 | 2437 | case LTTNG_KERNEL_ABI_KRETPROBE: |
6dccd6c1 JD |
2438 | uevent_param->u.kretprobe.addr = |
2439 | old_uevent_param->u.kretprobe.addr; | |
2440 | uevent_param->u.kretprobe.offset = | |
2441 | old_uevent_param->u.kretprobe.offset; | |
2442 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2443 | old_uevent_param->u.kretprobe.symbol_name, | |
2444 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2445 | break; | |
606828e4 | 2446 | case LTTNG_KERNEL_ABI_FUNCTION: |
e884017c MD |
2447 | WARN_ON_ONCE(1); |
2448 | /* Not implemented. */ | |
6dccd6c1 JD |
2449 | break; |
2450 | default: | |
2451 | break; | |
2452 | } | |
2453 | ret = lttng_abi_create_event(file, uevent_param); | |
2454 | ||
2455 | old_event_error_free_old_param: | |
2456 | kfree(old_uevent_param); | |
2457 | old_event_error_free_param: | |
2458 | kfree(uevent_param); | |
2459 | old_event_end: | |
2460 | return ret; | |
2461 | } | |
606828e4 | 2462 | case LTTNG_KERNEL_ABI_EVENT: |
6dccd6c1 | 2463 | { |
606828e4 | 2464 | struct lttng_kernel_abi_event uevent_param; |
6dccd6c1 JD |
2465 | |
2466 | if (copy_from_user(&uevent_param, | |
606828e4 | 2467 | (struct lttng_kernel_abi_event __user *) arg, |
6dccd6c1 JD |
2468 | sizeof(uevent_param))) |
2469 | return -EFAULT; | |
2470 | return lttng_abi_create_event(file, &uevent_param); | |
2471 | } | |
606828e4 | 2472 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2473 | { |
606828e4 MD |
2474 | struct lttng_kernel_abi_context *ucontext_param; |
2475 | struct lttng_kernel_abi_old_context *old_ucontext_param; | |
6dccd6c1 JD |
2476 | int ret; |
2477 | ||
606828e4 | 2478 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_context), |
6dccd6c1 JD |
2479 | GFP_KERNEL); |
2480 | if (!ucontext_param) { | |
2481 | ret = -ENOMEM; | |
2482 | goto old_ctx_end; | |
2483 | } | |
606828e4 | 2484 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_old_context), |
6dccd6c1 JD |
2485 | GFP_KERNEL); |
2486 | if (!old_ucontext_param) { | |
2487 | ret = -ENOMEM; | |
2488 | goto old_ctx_error_free_param; | |
2489 | } | |
2490 | ||
2491 | if (copy_from_user(old_ucontext_param, | |
606828e4 MD |
2492 | (struct lttng_kernel_abi_old_context __user *) arg, |
2493 | sizeof(struct lttng_kernel_abi_old_context))) { | |
6dccd6c1 JD |
2494 | ret = -EFAULT; |
2495 | goto old_ctx_error_free_old_param; | |
2496 | } | |
2497 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2498 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2499 | sizeof(ucontext_param->padding)); | |
2500 | /* only type that uses the union */ | |
606828e4 | 2501 | if (old_ucontext_param->ctx == LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER) { |
6dccd6c1 JD |
2502 | ucontext_param->u.perf_counter.type = |
2503 | old_ucontext_param->u.perf_counter.type; | |
2504 | ucontext_param->u.perf_counter.config = | |
2505 | old_ucontext_param->u.perf_counter.config; | |
2506 | memcpy(ucontext_param->u.perf_counter.name, | |
2507 | old_ucontext_param->u.perf_counter.name, | |
2508 | sizeof(ucontext_param->u.perf_counter.name)); | |
2509 | } | |
2510 | ||
2511 | ret = lttng_abi_add_context(file, | |
2512 | ucontext_param, | |
f7d06400 | 2513 | &channel->priv->ctx, channel->parent.session); |
6dccd6c1 JD |
2514 | |
2515 | old_ctx_error_free_old_param: | |
2516 | kfree(old_ucontext_param); | |
2517 | old_ctx_error_free_param: | |
2518 | kfree(ucontext_param); | |
2519 | old_ctx_end: | |
2520 | return ret; | |
2521 | } | |
606828e4 | 2522 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2523 | { |
606828e4 | 2524 | struct lttng_kernel_abi_context ucontext_param; |
6dccd6c1 JD |
2525 | |
2526 | if (copy_from_user(&ucontext_param, | |
606828e4 | 2527 | (struct lttng_kernel_abi_context __user *) arg, |
6dccd6c1 JD |
2528 | sizeof(ucontext_param))) |
2529 | return -EFAULT; | |
2530 | return lttng_abi_add_context(file, | |
2531 | &ucontext_param, | |
f7d06400 | 2532 | &channel->priv->ctx, channel->parent.session); |
6dccd6c1 | 2533 | } |
606828e4 MD |
2534 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2535 | case LTTNG_KERNEL_ABI_ENABLE: | |
6b757027 | 2536 | return lttng_channel_enable(&channel->parent); |
606828e4 MD |
2537 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2538 | case LTTNG_KERNEL_ABI_DISABLE: | |
6b757027 | 2539 | return lttng_channel_disable(&channel->parent); |
606828e4 | 2540 | case LTTNG_KERNEL_ABI_SYSCALL_MASK: |
c970b655 | 2541 | return lttng_syscall_table_get_active_mask(&channel->priv->parent.syscall_table, |
606828e4 | 2542 | (struct lttng_kernel_abi_syscall_mask __user *) arg); |
baf20995 MD |
2543 | default: |
2544 | return -ENOIOCTLCMD; | |
2545 | } | |
2546 | } | |
2547 | ||
5dbbdb43 MD |
2548 | /** |
2549 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2550 | * | |
2551 | * @file: the file | |
2552 | * @cmd: the command | |
2553 | * @arg: command arg | |
2554 | * | |
2555 | * This ioctl implements lttng commands: | |
606828e4 | 2556 | * LTTNG_KERNEL_ABI_STREAM |
5dbbdb43 MD |
2557 | * Returns an event stream file descriptor or failure. |
2558 | * | |
2559 | * Channel and event file descriptors also hold a reference on the session. | |
2560 | */ | |
2561 | static | |
2562 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2563 | { | |
2564 | switch (cmd) { | |
606828e4 MD |
2565 | case LTTNG_KERNEL_ABI_OLD_STREAM: |
2566 | case LTTNG_KERNEL_ABI_STREAM: | |
d83004aa | 2567 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2568 | default: |
2569 | return -ENOIOCTLCMD; | |
2570 | } | |
2571 | } | |
2572 | ||
653fe716 MD |
2573 | /** |
2574 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2575 | * | |
c0e31d2e | 2576 | * @file: the file |
653fe716 MD |
2577 | * @wait: poll table |
2578 | */ | |
c0e31d2e | 2579 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2580 | { |
f7d06400 | 2581 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
653fe716 MD |
2582 | unsigned int mask = 0; |
2583 | ||
c0e31d2e | 2584 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2585 | poll_wait_set_exclusive(wait); |
f7d06400 | 2586 | poll_wait(file, channel->ops->priv->get_hp_wait_queue(channel->priv->rb_chan), |
24cedcfe | 2587 | wait); |
653fe716 | 2588 | |
f7d06400 | 2589 | if (channel->ops->priv->is_disabled(channel->priv->rb_chan)) |
254ec7bc | 2590 | return POLLERR; |
f7d06400 | 2591 | if (channel->ops->priv->is_finalized(channel->priv->rb_chan)) |
653fe716 | 2592 | return POLLHUP; |
f7d06400 | 2593 | if (channel->ops->priv->buffer_has_read_closed_stream(channel->priv->rb_chan)) |
653fe716 | 2594 | return POLLIN | POLLRDNORM; |
f71ecafa | 2595 | return 0; |
653fe716 MD |
2596 | } |
2597 | return mask; | |
2598 | ||
2599 | } | |
2600 | ||
0a84a57f MD |
2601 | static |
2602 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2603 | { | |
f7d06400 | 2604 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
c269fff4 MD |
2605 | |
2606 | if (channel) | |
f7d06400 | 2607 | fput(channel->parent.session->priv->file); |
0a84a57f MD |
2608 | return 0; |
2609 | } | |
2610 | ||
d83004aa JD |
2611 | static |
2612 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2613 | { | |
f7d06400 | 2614 | struct lttng_kernel_channel_buffer *channel = file->private_data; |
d83004aa JD |
2615 | |
2616 | if (channel) { | |
f7d06400 | 2617 | fput(channel->parent.session->priv->file); |
a3381417 | 2618 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2619 | } |
2620 | ||
2621 | return 0; | |
2622 | } | |
2623 | ||
ad1c05e1 | 2624 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2625 | .owner = THIS_MODULE, |
03037b98 | 2626 | .release = lttng_channel_release, |
653fe716 | 2627 | .poll = lttng_channel_poll, |
ad1c05e1 | 2628 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2629 | #ifdef CONFIG_COMPAT |
03037b98 | 2630 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2631 | #endif |
11b5a3c2 | 2632 | }; |
baf20995 | 2633 | |
5dbbdb43 | 2634 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2635 | .owner = THIS_MODULE, |
d83004aa | 2636 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2637 | .unlocked_ioctl = lttng_metadata_ioctl, |
2638 | #ifdef CONFIG_COMPAT | |
2639 | .compat_ioctl = lttng_metadata_ioctl, | |
2640 | #endif | |
2641 | }; | |
2642 | ||
8070f5c0 | 2643 | /** |
ef784b4d | 2644 | * lttng_event_recorder_event_ioctl - lttng syscall through ioctl |
8070f5c0 MD |
2645 | * |
2646 | * @file: the file | |
2647 | * @cmd: the command | |
2648 | * @arg: command arg | |
2649 | * | |
2650 | * This ioctl implements lttng commands: | |
606828e4 | 2651 | * LTTNG_KERNEL_ABI_CONTEXT |
8070f5c0 | 2652 | * Prepend a context field to each record of this event |
606828e4 | 2653 | * LTTNG_KERNEL_ABI_ENABLE |
e64957da | 2654 | * Enable recording for this event (weak enable) |
606828e4 | 2655 | * LTTNG_KERNEL_ABI_DISABLE |
e64957da | 2656 | * Disable recording for this event (strong disable) |
8070f5c0 MD |
2657 | */ |
2658 | static | |
ef784b4d | 2659 | long lttng_event_recorder_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
8070f5c0 | 2660 | { |
e2d5dbc7 | 2661 | struct lttng_kernel_event_recorder *event_recorder = file->private_data; |
8070f5c0 MD |
2662 | |
2663 | switch (cmd) { | |
606828e4 | 2664 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: |
6dccd6c1 | 2665 | { |
3c997079 MD |
2666 | /* Not implemented */ |
2667 | return -ENOSYS; | |
6dccd6c1 | 2668 | } |
606828e4 | 2669 | case LTTNG_KERNEL_ABI_CONTEXT: |
6dccd6c1 | 2670 | { |
3c997079 MD |
2671 | /* Not implemented */ |
2672 | return -ENOSYS; | |
6dccd6c1 | 2673 | } |
606828e4 MD |
2674 | case LTTNG_KERNEL_ABI_OLD_ENABLE: |
2675 | case LTTNG_KERNEL_ABI_ENABLE: | |
9d993668 | 2676 | return lttng_event_enable(&event_recorder->parent); |
606828e4 MD |
2677 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2678 | case LTTNG_KERNEL_ABI_DISABLE: | |
9d993668 | 2679 | return lttng_event_disable(&event_recorder->parent); |
606828e4 | 2680 | case LTTNG_KERNEL_ABI_FILTER: |
ef784b4d | 2681 | return -EINVAL; |
606828e4 | 2682 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: |
e2d5dbc7 | 2683 | return lttng_event_add_callsite(&event_recorder->parent, |
ef784b4d | 2684 | (struct lttng_kernel_abi_event_callsite __user *) arg); |
8070f5c0 MD |
2685 | default: |
2686 | return -ENOIOCTLCMD; | |
2687 | } | |
2688 | } | |
2689 | ||
ef784b4d MD |
2690 | /** |
2691 | * lttng_event_recorder_enabler_ioctl - lttng syscall through ioctl | |
2692 | * | |
2693 | * @file: the file | |
2694 | * @cmd: the command | |
2695 | * @arg: command arg | |
2696 | * | |
2697 | * This ioctl implements lttng commands: | |
2698 | * LTTNG_KERNEL_ABI_CONTEXT | |
2699 | * Prepend a context field to each record of this event | |
2700 | * LTTNG_KERNEL_ABI_ENABLE | |
2701 | * Enable recording for this event (weak enable) | |
2702 | * LTTNG_KERNEL_ABI_DISABLE | |
2703 | * Disable recording for this event (strong disable) | |
2704 | */ | |
0a84a57f | 2705 | static |
ef784b4d | 2706 | long lttng_event_recorder_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
0a84a57f | 2707 | { |
1ae083ba | 2708 | struct lttng_event_recorder_enabler *event_enabler = file->private_data; |
3c997079 | 2709 | |
ef784b4d MD |
2710 | switch (cmd) { |
2711 | case LTTNG_KERNEL_ABI_OLD_CONTEXT: | |
2712 | { | |
2713 | /* Not implemented */ | |
2714 | return -ENOSYS; | |
2715 | } | |
2716 | case LTTNG_KERNEL_ABI_CONTEXT: | |
2717 | { | |
2718 | /* Not implemented */ | |
2719 | return -ENOSYS; | |
2720 | } | |
2721 | case LTTNG_KERNEL_ABI_OLD_ENABLE: | |
2722 | case LTTNG_KERNEL_ABI_ENABLE: | |
7b25ab0e | 2723 | return lttng_event_enabler_enable(&event_enabler->parent); |
ef784b4d MD |
2724 | case LTTNG_KERNEL_ABI_OLD_DISABLE: |
2725 | case LTTNG_KERNEL_ABI_DISABLE: | |
7b25ab0e | 2726 | return lttng_event_enabler_disable(&event_enabler->parent); |
ef784b4d | 2727 | case LTTNG_KERNEL_ABI_FILTER: |
6048044f | 2728 | return lttng_event_enabler_attach_filter_bytecode(&event_enabler->parent, |
ef784b4d MD |
2729 | (struct lttng_kernel_abi_filter_bytecode __user *) arg); |
2730 | case LTTNG_KERNEL_ABI_ADD_CALLSITE: | |
2731 | return -EINVAL; | |
3c997079 | 2732 | default: |
ef784b4d | 2733 | return -ENOIOCTLCMD; |
3c997079 | 2734 | } |
ef784b4d MD |
2735 | } |
2736 | ||
2737 | static | |
2738 | int lttng_event_recorder_event_release(struct inode *inode, struct file *file) | |
2739 | { | |
a67ba386 | 2740 | struct lttng_kernel_event_recorder *event = file->private_data; |
ef784b4d MD |
2741 | |
2742 | if (event) | |
f7d06400 | 2743 | fput(event->chan->priv->parent.file); |
ef784b4d MD |
2744 | return 0; |
2745 | } | |
c269fff4 | 2746 | |
ef784b4d MD |
2747 | static |
2748 | int lttng_event_recorder_enabler_release(struct inode *inode, struct file *file) | |
2749 | { | |
1ae083ba | 2750 | struct lttng_event_recorder_enabler *event_enabler = file->private_data; |
ef784b4d MD |
2751 | |
2752 | if (event_enabler) | |
f7d06400 | 2753 | fput(event_enabler->chan->priv->parent.file); |
0a84a57f MD |
2754 | return 0; |
2755 | } | |
2756 | ||
ef784b4d MD |
2757 | static const struct file_operations lttng_event_recorder_event_fops = { |
2758 | .owner = THIS_MODULE, | |
2759 | .release = lttng_event_recorder_event_release, | |
2760 | .unlocked_ioctl = lttng_event_recorder_event_ioctl, | |
2761 | #ifdef CONFIG_COMPAT | |
2762 | .compat_ioctl = lttng_event_recorder_event_ioctl, | |
2763 | #endif | |
2764 | }; | |
2765 | ||
2766 | static const struct file_operations lttng_event_recorder_enabler_fops = { | |
a33c9927 | 2767 | .owner = THIS_MODULE, |
ef784b4d MD |
2768 | .release = lttng_event_recorder_enabler_release, |
2769 | .unlocked_ioctl = lttng_event_recorder_enabler_ioctl, | |
8070f5c0 | 2770 | #ifdef CONFIG_COMPAT |
ef784b4d | 2771 | .compat_ioctl = lttng_event_recorder_enabler_ioctl, |
8070f5c0 | 2772 | #endif |
11b5a3c2 | 2773 | }; |
0a84a57f | 2774 | |
3b731ab1 JD |
2775 | static int put_u64(uint64_t val, unsigned long arg) |
2776 | { | |
2777 | return put_user(val, (uint64_t __user *) arg); | |
2778 | } | |
2779 | ||
8b97fd42 MD |
2780 | static int put_u32(uint32_t val, unsigned long arg) |
2781 | { | |
2782 | return put_user(val, (uint32_t __user *) arg); | |
2783 | } | |
2784 | ||
ed8d02d6 JD |
2785 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2786 | unsigned int cmd, unsigned long arg) | |
2787 | { | |
e20c0fec | 2788 | struct lttng_kernel_ring_buffer *buf = filp->private_data; |
860c213b | 2789 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
e20c0fec | 2790 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; |
4a399b76 | 2791 | const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2792 | int ret; |
2793 | ||
2794 | if (atomic_read(&chan->record_disabled)) | |
2795 | return -EIO; | |
2796 | ||
ed8d02d6 | 2797 | switch (cmd) { |
606828e4 | 2798 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2799 | { |
2800 | uint64_t ts; | |
2801 | ||
4a399b76 | 2802 | ret = ops->priv->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2803 | if (ret < 0) |
2804 | goto error; | |
2805 | return put_u64(ts, arg); | |
2806 | } | |
606828e4 | 2807 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END: |
3b731ab1 JD |
2808 | { |
2809 | uint64_t ts; | |
2810 | ||
4a399b76 | 2811 | ret = ops->priv->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2812 | if (ret < 0) |
2813 | goto error; | |
2814 | return put_u64(ts, arg); | |
2815 | } | |
606828e4 | 2816 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2817 | { |
2818 | uint64_t ed; | |
2819 | ||
4a399b76 | 2820 | ret = ops->priv->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2821 | if (ret < 0) |
2822 | goto error; | |
2823 | return put_u64(ed, arg); | |
2824 | } | |
606828e4 | 2825 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE: |
3b731ab1 JD |
2826 | { |
2827 | uint64_t cs; | |
2828 | ||
4a399b76 | 2829 | ret = ops->priv->content_size(config, buf, &cs); |
3b731ab1 JD |
2830 | if (ret < 0) |
2831 | goto error; | |
2832 | return put_u64(cs, arg); | |
2833 | } | |
606828e4 | 2834 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE: |
3b731ab1 JD |
2835 | { |
2836 | uint64_t ps; | |
2837 | ||
4a399b76 | 2838 | ret = ops->priv->packet_size(config, buf, &ps); |
3b731ab1 JD |
2839 | if (ret < 0) |
2840 | goto error; | |
2841 | return put_u64(ps, arg); | |
2842 | } | |
606828e4 | 2843 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID: |
3b731ab1 JD |
2844 | { |
2845 | uint64_t si; | |
2846 | ||
4a399b76 | 2847 | ret = ops->priv->stream_id(config, buf, &si); |
3b731ab1 JD |
2848 | if (ret < 0) |
2849 | goto error; | |
2850 | return put_u64(si, arg); | |
2851 | } | |
606828e4 | 2852 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2853 | { |
2854 | uint64_t ts; | |
2855 | ||
4a399b76 | 2856 | ret = ops->priv->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2857 | if (ret < 0) |
2858 | goto error; | |
2859 | return put_u64(ts, arg); | |
2860 | } | |
606828e4 | 2861 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM: |
5b3cf4f9 JD |
2862 | { |
2863 | uint64_t seq; | |
2864 | ||
4a399b76 | 2865 | ret = ops->priv->sequence_number(config, buf, &seq); |
5b3cf4f9 JD |
2866 | if (ret < 0) |
2867 | goto error; | |
2868 | return put_u64(seq, arg); | |
2869 | } | |
606828e4 | 2870 | case LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID: |
5594698f JD |
2871 | { |
2872 | uint64_t id; | |
2873 | ||
4a399b76 | 2874 | ret = ops->priv->instance_id(config, buf, &id); |
5594698f JD |
2875 | if (ret < 0) |
2876 | goto error; | |
2877 | return put_u64(id, arg); | |
2878 | } | |
3b731ab1 JD |
2879 | default: |
2880 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2881 | cmd, arg); | |
ed8d02d6 | 2882 | } |
3b731ab1 JD |
2883 | |
2884 | error: | |
2885 | return -ENOSYS; | |
ed8d02d6 JD |
2886 | } |
2887 | ||
2888 | #ifdef CONFIG_COMPAT | |
2889 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2890 | unsigned int cmd, unsigned long arg) | |
2891 | { | |
e20c0fec | 2892 | struct lttng_kernel_ring_buffer *buf = filp->private_data; |
860c213b | 2893 | struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan; |
e20c0fec | 2894 | const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config; |
4a399b76 | 2895 | const struct lttng_kernel_channel_buffer_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2896 | int ret; |
2897 | ||
2898 | if (atomic_read(&chan->record_disabled)) | |
2899 | return -EIO; | |
2900 | ||
ed8d02d6 | 2901 | switch (cmd) { |
606828e4 | 2902 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
3b731ab1 JD |
2903 | { |
2904 | uint64_t ts; | |
2905 | ||
4a399b76 | 2906 | ret = ops->priv->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2907 | if (ret < 0) |
2908 | goto error; | |
2909 | return put_u64(ts, arg); | |
2910 | } | |
606828e4 | 2911 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: |
3b731ab1 JD |
2912 | { |
2913 | uint64_t ts; | |
2914 | ||
4a399b76 | 2915 | ret = ops->priv->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2916 | if (ret < 0) |
2917 | goto error; | |
2918 | return put_u64(ts, arg); | |
2919 | } | |
606828e4 | 2920 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: |
3b731ab1 JD |
2921 | { |
2922 | uint64_t ed; | |
2923 | ||
4a399b76 | 2924 | ret = ops->priv->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2925 | if (ret < 0) |
2926 | goto error; | |
2927 | return put_u64(ed, arg); | |
ed8d02d6 | 2928 | } |
606828e4 | 2929 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
3b731ab1 JD |
2930 | { |
2931 | uint64_t cs; | |
2932 | ||
4a399b76 | 2933 | ret = ops->priv->content_size(config, buf, &cs); |
3b731ab1 JD |
2934 | if (ret < 0) |
2935 | goto error; | |
2936 | return put_u64(cs, arg); | |
2937 | } | |
606828e4 | 2938 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_PACKET_SIZE: |
3b731ab1 JD |
2939 | { |
2940 | uint64_t ps; | |
2941 | ||
4a399b76 | 2942 | ret = ops->priv->packet_size(config, buf, &ps); |
3b731ab1 JD |
2943 | if (ret < 0) |
2944 | goto error; | |
2945 | return put_u64(ps, arg); | |
2946 | } | |
606828e4 | 2947 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_STREAM_ID: |
3b731ab1 JD |
2948 | { |
2949 | uint64_t si; | |
2950 | ||
4a399b76 | 2951 | ret = ops->priv->stream_id(config, buf, &si); |
3b731ab1 JD |
2952 | if (ret < 0) |
2953 | goto error; | |
2954 | return put_u64(si, arg); | |
2955 | } | |
606828e4 | 2956 | case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2348ca17 JD |
2957 | { |
2958 | uint64_t ts; | |
2959 | ||
4a399b76 | 2960 | ret = ops->priv->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2961 | if (ret < 0) |
2962 | goto error; | |
2963 | return put_u64(ts, arg); | |
2964 | } | |
606828e4 | 2965 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
5b3cf4f9 JD |
2966 | { |
2967 | uint64_t seq; | |
2968 | ||
4a399b76 | 2969 | ret = ops->priv->sequence_number(config, buf, &seq); |
5b3cf4f9 JD |
2970 | if (ret < 0) |
2971 | goto error; | |
2972 | return put_u64(seq, arg); | |
2973 | } | |
606828e4 | 2974 | case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_INSTANCE_ID: |
5594698f JD |
2975 | { |
2976 | uint64_t id; | |
2977 | ||
4a399b76 | 2978 | ret = ops->priv->instance_id(config, buf, &id); |
5594698f JD |
2979 | if (ret < 0) |
2980 | goto error; | |
2981 | return put_u64(id, arg); | |
2982 | } | |
3b731ab1 JD |
2983 | default: |
2984 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2985 | cmd, arg); | |
2986 | } | |
2987 | ||
2988 | error: | |
2989 | return -ENOSYS; | |
ed8d02d6 JD |
2990 | } |
2991 | #endif /* CONFIG_COMPAT */ | |
2992 | ||
2993 | static void lttng_stream_override_ring_buffer_fops(void) | |
2994 | { | |
2995 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2996 | lttng_stream_ring_buffer_file_operations.open = | |
2997 | lib_ring_buffer_file_operations.open; | |
2998 | lttng_stream_ring_buffer_file_operations.release = | |
2999 | lib_ring_buffer_file_operations.release; | |
3000 | lttng_stream_ring_buffer_file_operations.poll = | |
3001 | lib_ring_buffer_file_operations.poll; | |
3002 | lttng_stream_ring_buffer_file_operations.splice_read = | |
3003 | lib_ring_buffer_file_operations.splice_read; | |
3004 | lttng_stream_ring_buffer_file_operations.mmap = | |
3005 | lib_ring_buffer_file_operations.mmap; | |
3006 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
3007 | lttng_stream_ring_buffer_ioctl; | |
3008 | lttng_stream_ring_buffer_file_operations.llseek = | |
3009 | lib_ring_buffer_file_operations.llseek; | |
3010 | #ifdef CONFIG_COMPAT | |
3011 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
3012 | lttng_stream_ring_buffer_compat_ioctl; | |
3013 | #endif | |
3014 | } | |
3015 | ||
80996790 | 3016 | int __init lttng_abi_init(void) |
baf20995 MD |
3017 | { |
3018 | int ret = 0; | |
3019 | ||
263b6c88 | 3020 | wrapper_vmalloc_sync_mappings(); |
2754583e | 3021 | lttng_clock_ref(); |
f771eda6 JD |
3022 | |
3023 | ret = lttng_tp_mempool_init(); | |
3024 | if (ret) { | |
3025 | goto error; | |
3026 | } | |
3027 | ||
d29348f7 | 3028 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 3029 | <tng_proc_ops, NULL); |
2470a237 | 3030 | |
255e52a4 | 3031 | if (!lttng_proc_dentry) { |
5a15f70c | 3032 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
3033 | ret = -ENOMEM; |
3034 | goto error; | |
3035 | } | |
ed8d02d6 | 3036 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 3037 | return 0; |
ed8d02d6 | 3038 | |
baf20995 | 3039 | error: |
f771eda6 | 3040 | lttng_tp_mempool_destroy(); |
2754583e | 3041 | lttng_clock_unref(); |
baf20995 MD |
3042 | return ret; |
3043 | } | |
3044 | ||
e6e65fcd MD |
3045 | /* No __exit annotation because used by init error path too. */ |
3046 | void lttng_abi_exit(void) | |
baf20995 | 3047 | { |
f771eda6 | 3048 | lttng_tp_mempool_destroy(); |
2754583e | 3049 | lttng_clock_unref(); |
e6a17f26 MD |
3050 | if (lttng_proc_dentry) |
3051 | remove_proc_entry("lttng", NULL); | |
baf20995 | 3052 | } |