Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
e8951e63 | 3 | * lttng-abi.c |
baf20995 | 4 | * |
e8951e63 | 5 | * LTTng ABI |
baf20995 | 6 | * |
886d51a3 MD |
7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8 | * | |
baf20995 MD |
9 | * Mimic system calls for: |
10 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
11 | * - channel creation, returns a file descriptor or failure. |
12 | * - Operates on a session file descriptor | |
13 | * - Takes all channel options as parameters. | |
14 | * - stream get, returns a file descriptor or failure. | |
15 | * - Operates on a channel file descriptor. | |
16 | * - stream notifier get, returns a file descriptor or failure. | |
17 | * - Operates on a channel file descriptor. | |
18 | * - event creation, returns a file descriptor or failure. | |
19 | * - Operates on a channel file descriptor | |
20 | * - Takes an event name as parameter | |
21 | * - Takes an instrumentation source as parameter | |
22 | * - e.g. tracepoints, dynamic_probes... | |
23 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
24 | */ |
25 | ||
11b5a3c2 | 26 | #include <linux/module.h> |
e6a17f26 | 27 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/slab.h> | |
abc0446a | 32 | #include <linux/err.h> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
24591303 MD |
34 | #include <ringbuffer/vfs.h> |
35 | #include <ringbuffer/backend.h> | |
36 | #include <ringbuffer/frontend.h> | |
241ae9a8 MD |
37 | #include <wrapper/poll.h> |
38 | #include <wrapper/file.h> | |
39 | #include <wrapper/kref.h> | |
2df37e95 MD |
40 | #include <lttng/string-utils.h> |
41 | #include <lttng/abi.h> | |
42 | #include <lttng/abi-old.h> | |
43 | #include <lttng/events.h> | |
44 | #include <lttng/tracer.h> | |
45 | #include <lttng/tp-mempool.h> | |
24591303 | 46 | #include <ringbuffer/frontend_types.h> |
4442bc1b | 47 | #include <ringbuffer/iterator.h> |
baf20995 MD |
48 | |
49 | /* | |
50 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 51 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
52 | */ |
53 | ||
e6a17f26 | 54 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
55 | |
56 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
57 | static const struct proc_ops lttng_proc_ops; | |
58 | #else | |
59 | static const struct file_operations lttng_proc_ops; | |
60 | #endif | |
61 | ||
4442bc1b JR |
62 | static DEFINE_MUTEX(trigger_group_mutex); |
63 | ||
ad1c05e1 | 64 | static const struct file_operations lttng_session_fops; |
4442bc1b | 65 | static const struct file_operations lttng_trigger_group_fops; |
ad1c05e1 | 66 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 67 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 68 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 69 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 70 | |
9616f0bf | 71 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 72 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 73 | |
a33c9927 MD |
74 | /* |
75 | * Teardown management: opened file descriptors keep a refcount on the module, | |
76 | * so it can only exit when all file descriptors are closed. | |
77 | */ | |
78 | ||
ad1c05e1 | 79 | static |
baf20995 MD |
80 | int lttng_abi_create_session(void) |
81 | { | |
a90917c3 | 82 | struct lttng_session *session; |
c0e31d2e | 83 | struct file *session_file; |
11b5a3c2 | 84 | int session_fd, ret; |
baf20995 | 85 | |
a90917c3 | 86 | session = lttng_session_create(); |
baf20995 MD |
87 | if (!session) |
88 | return -ENOMEM; | |
4ac10b76 | 89 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
90 | if (session_fd < 0) { |
91 | ret = session_fd; | |
92 | goto fd_error; | |
93 | } | |
c0e31d2e | 94 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 95 | <tng_session_fops, |
baf20995 | 96 | session, O_RDWR); |
c0e31d2e MD |
97 | if (IS_ERR(session_file)) { |
98 | ret = PTR_ERR(session_file); | |
baf20995 MD |
99 | goto file_error; |
100 | } | |
c0e31d2e MD |
101 | session->file = session_file; |
102 | fd_install(session_fd, session_file); | |
baf20995 MD |
103 | return session_fd; |
104 | ||
105 | file_error: | |
106 | put_unused_fd(session_fd); | |
107 | fd_error: | |
a90917c3 | 108 | lttng_session_destroy(session); |
baf20995 MD |
109 | return ret; |
110 | } | |
111 | ||
4442bc1b JR |
112 | static |
113 | void trigger_send_notification_work_wakeup(struct irq_work *entry) | |
114 | { | |
115 | struct lttng_trigger_group *trigger_group = container_of(entry, | |
116 | struct lttng_trigger_group, wakeup_pending); | |
117 | wake_up_interruptible(&trigger_group->read_wait); | |
118 | } | |
119 | ||
120 | static | |
121 | int lttng_abi_create_trigger_group(void) | |
122 | { | |
123 | struct lttng_trigger_group *trigger_group; | |
124 | struct file *trigger_group_file; | |
125 | int trigger_group_fd, ret; | |
126 | ||
127 | trigger_group = lttng_trigger_group_create(); | |
128 | if (!trigger_group) | |
129 | return -ENOMEM; | |
130 | ||
131 | trigger_group_fd = lttng_get_unused_fd(); | |
132 | if (trigger_group_fd < 0) { | |
133 | ret = trigger_group_fd; | |
134 | goto fd_error; | |
135 | } | |
136 | trigger_group_file = anon_inode_getfile("[lttng_trigger_group]", | |
137 | <tng_trigger_group_fops, | |
138 | trigger_group, O_RDWR); | |
139 | if (IS_ERR(trigger_group_file)) { | |
140 | ret = PTR_ERR(trigger_group_file); | |
141 | goto file_error; | |
142 | } | |
143 | ||
144 | trigger_group->file = trigger_group_file; | |
145 | init_waitqueue_head(&trigger_group->read_wait); | |
146 | init_irq_work(&trigger_group->wakeup_pending, | |
147 | trigger_send_notification_work_wakeup); | |
148 | fd_install(trigger_group_fd, trigger_group_file); | |
149 | return trigger_group_fd; | |
150 | ||
151 | file_error: | |
152 | put_unused_fd(trigger_group_fd); | |
153 | fd_error: | |
154 | lttng_trigger_group_destroy(trigger_group); | |
155 | return ret; | |
156 | } | |
157 | ||
271b6681 MD |
158 | static |
159 | int lttng_abi_tracepoint_list(void) | |
160 | { | |
161 | struct file *tracepoint_list_file; | |
162 | int file_fd, ret; | |
163 | ||
4ac10b76 | 164 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
165 | if (file_fd < 0) { |
166 | ret = file_fd; | |
167 | goto fd_error; | |
168 | } | |
30f18bf0 | 169 | |
8ee099b6 | 170 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
171 | <tng_tracepoint_list_fops, |
172 | NULL, O_RDWR); | |
173 | if (IS_ERR(tracepoint_list_file)) { | |
174 | ret = PTR_ERR(tracepoint_list_file); | |
175 | goto file_error; | |
176 | } | |
30f18bf0 MD |
177 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
178 | if (ret < 0) | |
179 | goto open_error; | |
271b6681 MD |
180 | fd_install(file_fd, tracepoint_list_file); |
181 | return file_fd; | |
182 | ||
30f18bf0 MD |
183 | open_error: |
184 | fput(tracepoint_list_file); | |
271b6681 MD |
185 | file_error: |
186 | put_unused_fd(file_fd); | |
187 | fd_error: | |
188 | return ret; | |
189 | } | |
190 | ||
f127e61e MD |
191 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
192 | static inline | |
193 | int lttng_abi_syscall_list(void) | |
194 | { | |
195 | return -ENOSYS; | |
196 | } | |
197 | #else | |
198 | static | |
199 | int lttng_abi_syscall_list(void) | |
200 | { | |
201 | struct file *syscall_list_file; | |
202 | int file_fd, ret; | |
203 | ||
204 | file_fd = lttng_get_unused_fd(); | |
205 | if (file_fd < 0) { | |
206 | ret = file_fd; | |
207 | goto fd_error; | |
208 | } | |
209 | ||
210 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
211 | <tng_syscall_list_fops, | |
212 | NULL, O_RDWR); | |
213 | if (IS_ERR(syscall_list_file)) { | |
214 | ret = PTR_ERR(syscall_list_file); | |
215 | goto file_error; | |
216 | } | |
217 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
218 | if (ret < 0) | |
219 | goto open_error; | |
220 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
221 | return file_fd; |
222 | ||
223 | open_error: | |
224 | fput(syscall_list_file); | |
225 | file_error: | |
226 | put_unused_fd(file_fd); | |
227 | fd_error: | |
228 | return ret; | |
229 | } | |
230 | #endif | |
231 | ||
80c16bcf | 232 | static |
6dccd6c1 | 233 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 234 | { |
6dccd6c1 JD |
235 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
236 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
237 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
238 | } |
239 | ||
42cabb80 MD |
240 | static |
241 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
242 | { | |
243 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
244 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
245 | } | |
246 | ||
8070f5c0 MD |
247 | static |
248 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 249 | struct lttng_kernel_context *context_param, |
a90917c3 | 250 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 251 | { |
8070f5c0 MD |
252 | |
253 | if (session->been_active) | |
254 | return -EPERM; | |
255 | ||
6dccd6c1 | 256 | switch (context_param->ctx) { |
12a313a5 | 257 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 258 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
259 | case LTTNG_KERNEL_CONTEXT_PRIO: |
260 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
261 | case LTTNG_KERNEL_CONTEXT_NICE: |
262 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
263 | case LTTNG_KERNEL_CONTEXT_VPID: |
264 | return lttng_add_vpid_to_ctx(ctx); | |
265 | case LTTNG_KERNEL_CONTEXT_TID: | |
266 | return lttng_add_tid_to_ctx(ctx); | |
267 | case LTTNG_KERNEL_CONTEXT_VTID: | |
268 | return lttng_add_vtid_to_ctx(ctx); | |
269 | case LTTNG_KERNEL_CONTEXT_PPID: | |
270 | return lttng_add_ppid_to_ctx(ctx); | |
271 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
272 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 273 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
274 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
275 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
276 | context_param->u.perf_counter.config, | |
277 | context_param->u.perf_counter.name, | |
c24a0d71 | 278 | ctx); |
a2563e83 MD |
279 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
280 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
281 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
282 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
283 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
284 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
285 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
286 | return lttng_add_interruptible_to_ctx(ctx); | |
287 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
288 | return lttng_add_need_reschedule_to_ctx(ctx); | |
289 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
290 | return lttng_add_preemptible_to_ctx(ctx); | |
291 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
292 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
293 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
294 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
295 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
296 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
297 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
298 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
299 | return lttng_add_ipc_ns_to_ctx(ctx); | |
300 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
301 | return lttng_add_mnt_ns_to_ctx(ctx); | |
302 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
303 | return lttng_add_net_ns_to_ctx(ctx); | |
304 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
305 | return lttng_add_pid_ns_to_ctx(ctx); | |
306 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
307 | return lttng_add_user_ns_to_ctx(ctx); | |
308 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
309 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
310 | case LTTNG_KERNEL_CONTEXT_UID: |
311 | return lttng_add_uid_to_ctx(ctx); | |
312 | case LTTNG_KERNEL_CONTEXT_EUID: | |
313 | return lttng_add_euid_to_ctx(ctx); | |
314 | case LTTNG_KERNEL_CONTEXT_SUID: | |
315 | return lttng_add_suid_to_ctx(ctx); | |
316 | case LTTNG_KERNEL_CONTEXT_GID: | |
317 | return lttng_add_gid_to_ctx(ctx); | |
318 | case LTTNG_KERNEL_CONTEXT_EGID: | |
319 | return lttng_add_egid_to_ctx(ctx); | |
320 | case LTTNG_KERNEL_CONTEXT_SGID: | |
321 | return lttng_add_sgid_to_ctx(ctx); | |
322 | case LTTNG_KERNEL_CONTEXT_VUID: | |
323 | return lttng_add_vuid_to_ctx(ctx); | |
324 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
325 | return lttng_add_veuid_to_ctx(ctx); | |
326 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
327 | return lttng_add_vsuid_to_ctx(ctx); | |
328 | case LTTNG_KERNEL_CONTEXT_VGID: | |
329 | return lttng_add_vgid_to_ctx(ctx); | |
330 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
331 | return lttng_add_vegid_to_ctx(ctx); | |
332 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
333 | return lttng_add_vsgid_to_ctx(ctx); | |
876e2e92 MJ |
334 | case LTTNG_KERNEL_CONTEXT_TIME_NS: |
335 | return lttng_add_time_ns_to_ctx(ctx); | |
8070f5c0 MD |
336 | default: |
337 | return -EINVAL; | |
338 | } | |
339 | } | |
340 | ||
ad1c05e1 MD |
341 | /** |
342 | * lttng_ioctl - lttng syscall through ioctl | |
343 | * | |
c0e31d2e | 344 | * @file: the file |
ad1c05e1 MD |
345 | * @cmd: the command |
346 | * @arg: command arg | |
347 | * | |
348 | * This ioctl implements lttng commands: | |
38d024ae | 349 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 350 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
351 | * LTTNG_KERNEL_TRACER_VERSION |
352 | * Returns the LTTng kernel tracer version | |
353 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
354 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
355 | * LTTNG_KERNEL_WAIT_QUIESCENT |
356 | * Returns after all previously running probes have completed | |
42cabb80 MD |
357 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
358 | * Returns the LTTng kernel tracer ABI version | |
4442bc1b JR |
359 | * LTTNG_KERNEL_TRIGGER_GROUP_CREATE |
360 | * Returns a LTTng trigger group file descriptor | |
ad1c05e1 MD |
361 | * |
362 | * The returned session will be deleted when its file descriptor is closed. | |
363 | */ | |
364 | static | |
c0e31d2e | 365 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
366 | { |
367 | switch (cmd) { | |
6dccd6c1 | 368 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 369 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 370 | return lttng_abi_create_session(); |
4442bc1b JR |
371 | case LTTNG_KERNEL_TRIGGER_GROUP_CREATE: |
372 | return lttng_abi_create_trigger_group(); | |
6dccd6c1 JD |
373 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
374 | { | |
375 | struct lttng_kernel_tracer_version v; | |
376 | struct lttng_kernel_old_tracer_version oldv; | |
377 | struct lttng_kernel_old_tracer_version *uversion = | |
378 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
379 | ||
380 | lttng_abi_tracer_version(&v); | |
381 | oldv.major = v.major; | |
382 | oldv.minor = v.minor; | |
383 | oldv.patchlevel = v.patchlevel; | |
384 | ||
385 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
386 | return -EFAULT; | |
387 | return 0; | |
388 | } | |
80c16bcf | 389 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
390 | { |
391 | struct lttng_kernel_tracer_version version; | |
392 | struct lttng_kernel_tracer_version *uversion = | |
393 | (struct lttng_kernel_tracer_version __user *) arg; | |
394 | ||
395 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
396 | |
397 | if (copy_to_user(uversion, &version, sizeof(version))) | |
398 | return -EFAULT; | |
399 | return 0; | |
400 | } | |
401 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
402 | { | |
403 | struct lttng_kernel_tracer_abi_version version; | |
404 | struct lttng_kernel_tracer_abi_version *uversion = | |
405 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
406 | ||
407 | lttng_abi_tracer_abi_version(&version); | |
408 | ||
6dccd6c1 JD |
409 | if (copy_to_user(uversion, &version, sizeof(version))) |
410 | return -EFAULT; | |
411 | return 0; | |
412 | } | |
413 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
414 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
415 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
416 | case LTTNG_KERNEL_SYSCALL_LIST: |
417 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 418 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
419 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
420 | synchronize_trace(); | |
421 | return 0; | |
6dccd6c1 JD |
422 | case LTTNG_KERNEL_OLD_CALIBRATE: |
423 | { | |
424 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
425 | (struct lttng_kernel_old_calibrate __user *) arg; | |
426 | struct lttng_kernel_old_calibrate old_calibrate; | |
427 | struct lttng_kernel_calibrate calibrate; | |
428 | int ret; | |
429 | ||
430 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
431 | return -EFAULT; | |
432 | calibrate.type = old_calibrate.type; | |
433 | ret = lttng_calibrate(&calibrate); | |
434 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
435 | return -EFAULT; | |
436 | return ret; | |
437 | } | |
57105fc2 MD |
438 | case LTTNG_KERNEL_CALIBRATE: |
439 | { | |
3db41b2c MD |
440 | struct lttng_kernel_calibrate __user *ucalibrate = |
441 | (struct lttng_kernel_calibrate __user *) arg; | |
442 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
443 | int ret; |
444 | ||
445 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
446 | return -EFAULT; | |
447 | ret = lttng_calibrate(&calibrate); | |
448 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
449 | return -EFAULT; | |
450 | return ret; | |
451 | } | |
ad1c05e1 MD |
452 | default: |
453 | return -ENOIOCTLCMD; | |
454 | } | |
455 | } | |
456 | ||
059de147 MJ |
457 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
458 | static const struct proc_ops lttng_proc_ops = { | |
459 | .proc_ioctl = lttng_ioctl, | |
460 | #ifdef CONFIG_COMPAT | |
461 | .proc_compat_ioctl = lttng_ioctl, | |
462 | #endif /* CONFIG_COMPAT */ | |
463 | }; | |
464 | #else | |
465 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 466 | .owner = THIS_MODULE, |
ad1c05e1 MD |
467 | .unlocked_ioctl = lttng_ioctl, |
468 | #ifdef CONFIG_COMPAT | |
03037b98 | 469 | .compat_ioctl = lttng_ioctl, |
059de147 | 470 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 471 | }; |
059de147 | 472 | #endif |
ad1c05e1 | 473 | |
5dbbdb43 | 474 | static |
c0e31d2e | 475 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 476 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 477 | enum channel_type channel_type) |
baf20995 | 478 | { |
a90917c3 | 479 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 480 | const struct file_operations *fops = NULL; |
5dbbdb43 | 481 | const char *transport_name; |
a90917c3 | 482 | struct lttng_channel *chan; |
c0e31d2e | 483 | struct file *chan_file; |
baf20995 | 484 | int chan_fd; |
ad1c05e1 | 485 | int ret = 0; |
baf20995 | 486 | |
4ac10b76 | 487 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
488 | if (chan_fd < 0) { |
489 | ret = chan_fd; | |
490 | goto fd_error; | |
491 | } | |
88dfd899 MD |
492 | switch (channel_type) { |
493 | case PER_CPU_CHANNEL: | |
494 | fops = <tng_channel_fops; | |
495 | break; | |
496 | case METADATA_CHANNEL: | |
497 | fops = <tng_metadata_fops; | |
498 | break; | |
499 | } | |
2470a237 | 500 | |
c0e31d2e | 501 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 502 | fops, |
03037b98 | 503 | NULL, O_RDWR); |
c0e31d2e MD |
504 | if (IS_ERR(chan_file)) { |
505 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
506 | goto file_error; |
507 | } | |
5dbbdb43 MD |
508 | switch (channel_type) { |
509 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
510 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
511 | transport_name = chan_param->overwrite ? | |
96ba7208 | 512 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
513 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
514 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
515 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
516 | } else { | |
517 | return -EINVAL; | |
518 | } | |
5dbbdb43 | 519 | break; |
5dbbdb43 | 520 | case METADATA_CHANNEL: |
6dccd6c1 | 521 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 522 | transport_name = "relay-metadata"; |
6dccd6c1 | 523 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
524 | transport_name = "relay-metadata-mmap"; |
525 | else | |
526 | return -EINVAL; | |
5dbbdb43 MD |
527 | break; |
528 | default: | |
529 | transport_name = "<unknown>"; | |
530 | break; | |
531 | } | |
98d7281c MJ |
532 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
533 | ret = -EOVERFLOW; | |
9c1f4643 MD |
534 | goto refcount_error; |
535 | } | |
03037b98 MD |
536 | /* |
537 | * We tolerate no failure path after channel creation. It will stay | |
538 | * invariant for the rest of the session. | |
539 | */ | |
a90917c3 | 540 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
541 | chan_param->subbuf_size, |
542 | chan_param->num_subbuf, | |
543 | chan_param->switch_timer_interval, | |
d83004aa JD |
544 | chan_param->read_timer_interval, |
545 | channel_type); | |
03037b98 | 546 | if (!chan) { |
f3d01b96 | 547 | ret = -EINVAL; |
03037b98 MD |
548 | goto chan_error; |
549 | } | |
11b5a3c2 | 550 | chan->file = chan_file; |
c0e31d2e MD |
551 | chan_file->private_data = chan; |
552 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 553 | |
baf20995 MD |
554 | return chan_fd; |
555 | ||
03037b98 | 556 | chan_error: |
9c1f4643 MD |
557 | atomic_long_dec(&session_file->f_count); |
558 | refcount_error: | |
c0e31d2e | 559 | fput(chan_file); |
baf20995 MD |
560 | file_error: |
561 | put_unused_fd(chan_fd); | |
562 | fd_error: | |
baf20995 MD |
563 | return ret; |
564 | } | |
565 | ||
7f859fbf JR |
566 | static |
567 | int lttng_abi_session_set_name(struct lttng_session *session, | |
568 | struct lttng_kernel_session_name *name) | |
569 | { | |
570 | size_t len; | |
571 | ||
572 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
573 | ||
574 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
575 | /* Name is too long/malformed */ | |
576 | return -EINVAL; | |
577 | } | |
578 | ||
579 | strcpy(session->name, name->name); | |
580 | return 0; | |
581 | } | |
582 | ||
1c88f269 JR |
583 | static |
584 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
585 | struct lttng_kernel_session_creation_time *time) | |
586 | { | |
587 | size_t len; | |
588 | ||
589 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
590 | ||
591 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
592 | /* Time is too long/malformed */ | |
593 | return -EINVAL; | |
594 | } | |
595 | ||
596 | strcpy(session->creation_time, time->iso8601); | |
597 | return 0; | |
598 | } | |
599 | ||
4442bc1b JR |
600 | static |
601 | int lttng_counter_release(struct inode *inode, struct file *file) | |
602 | { | |
603 | struct lttng_counter *counter = file->private_data; | |
604 | ||
605 | if (counter) { | |
606 | /* | |
607 | * Do not destroy the counter itself. Wait of the owner | |
608 | * (trigger group) to be destroyed. | |
609 | */ | |
610 | fput(counter->owner); | |
611 | } | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
616 | static | |
617 | long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
618 | { | |
619 | struct lttng_counter *counter = file->private_data; | |
620 | size_t indexes[LTTNG_KERNEL_COUNTER_DIMENSION_MAX] = {0}; | |
621 | int i; | |
622 | ||
623 | switch (cmd) { | |
624 | case LTTNG_KERNEL_COUNTER_VALUE: | |
625 | { | |
626 | struct lttng_kernel_counter_value local_counter_value; | |
627 | struct lttng_kernel_counter_value __user *ucounter_value = | |
628 | (struct lttng_kernel_counter_value __user *) arg; | |
629 | int64_t value; | |
630 | int ret; | |
631 | ||
632 | if (copy_from_user(&local_counter_value, ucounter_value, | |
633 | sizeof(local_counter_value))) | |
634 | return -EFAULT; | |
635 | ||
636 | /* Cast all indexes into size_t. */ | |
637 | for (i = 0; i < local_counter_value.number_dimensions; i++) { | |
638 | indexes[i] = (size_t) local_counter_value.dimension_indexes[i]; | |
639 | } | |
640 | ||
641 | ret = lttng_kernel_counter_value(counter, indexes, &value); | |
642 | if (ret) | |
643 | return -EFAULT; | |
644 | ||
645 | if (copy_to_user(&ucounter_value->value, &value, sizeof(int64_t))) | |
646 | return -EFAULT; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | default: | |
651 | WARN_ON_ONCE(1); | |
652 | return -ENOSYS; | |
653 | } | |
654 | } | |
655 | ||
656 | static const struct file_operations lttng_counter_fops = { | |
657 | .owner = THIS_MODULE, | |
658 | .release = lttng_counter_release, | |
659 | .unlocked_ioctl = lttng_counter_ioctl, | |
660 | #ifdef CONFIG_COMPAT | |
661 | .compat_ioctl = lttng_counter_ioctl, | |
662 | #endif | |
663 | }; | |
664 | ||
665 | ||
d1f652f8 MD |
666 | static |
667 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
668 | { | |
669 | switch (tracker->type) { | |
670 | case LTTNG_KERNEL_TRACKER_PID: | |
671 | return TRACKER_PID; | |
672 | case LTTNG_KERNEL_TRACKER_VPID: | |
673 | return TRACKER_VPID; | |
674 | case LTTNG_KERNEL_TRACKER_UID: | |
675 | return TRACKER_UID; | |
676 | case LTTNG_KERNEL_TRACKER_VUID: | |
677 | return TRACKER_VUID; | |
678 | case LTTNG_KERNEL_TRACKER_GID: | |
679 | return TRACKER_GID; | |
680 | case LTTNG_KERNEL_TRACKER_VGID: | |
681 | return TRACKER_VGID; | |
682 | default: | |
683 | return TRACKER_UNKNOWN; | |
684 | } | |
685 | } | |
686 | ||
baf20995 | 687 | /** |
ad1c05e1 | 688 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 689 | * |
c0e31d2e | 690 | * @file: the file |
baf20995 MD |
691 | * @cmd: the command |
692 | * @arg: command arg | |
693 | * | |
694 | * This ioctl implements lttng commands: | |
38d024ae | 695 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 696 | * Returns a LTTng channel file descriptor |
e64957da MD |
697 | * LTTNG_KERNEL_ENABLE |
698 | * Enables tracing for a session (weak enable) | |
699 | * LTTNG_KERNEL_DISABLE | |
700 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
701 | * LTTNG_KERNEL_METADATA |
702 | * Returns a LTTng metadata file descriptor | |
e0130fab | 703 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 704 | * Add PID to session PID tracker |
e0130fab | 705 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
706 | * Remove PID from session PID tracker |
707 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
708 | * Add ID to tracker | |
709 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
710 | * Remove ID from tracker | |
ad1c05e1 MD |
711 | * |
712 | * The returned channel will be deleted when its file descriptor is closed. | |
713 | */ | |
714 | static | |
c0e31d2e | 715 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 716 | { |
a90917c3 | 717 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
718 | struct lttng_kernel_channel chan_param; |
719 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 720 | |
ad1c05e1 | 721 | switch (cmd) { |
6dccd6c1 JD |
722 | case LTTNG_KERNEL_OLD_CHANNEL: |
723 | { | |
6dccd6c1 JD |
724 | if (copy_from_user(&old_chan_param, |
725 | (struct lttng_kernel_old_channel __user *) arg, | |
726 | sizeof(struct lttng_kernel_old_channel))) | |
727 | return -EFAULT; | |
728 | chan_param.overwrite = old_chan_param.overwrite; | |
729 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
730 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
731 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
732 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
733 | chan_param.output = old_chan_param.output; | |
734 | ||
735 | return lttng_abi_create_channel(file, &chan_param, | |
736 | PER_CPU_CHANNEL); | |
737 | } | |
38d024ae | 738 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 739 | { |
6dccd6c1 | 740 | if (copy_from_user(&chan_param, |
38d024ae | 741 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
742 | sizeof(struct lttng_kernel_channel))) |
743 | return -EFAULT; | |
744 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 745 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
746 | } |
747 | case LTTNG_KERNEL_OLD_SESSION_START: | |
748 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 749 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 750 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 751 | return lttng_session_enable(session); |
6dccd6c1 JD |
752 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
753 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 754 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 755 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 756 | return lttng_session_disable(session); |
6dccd6c1 JD |
757 | case LTTNG_KERNEL_OLD_METADATA: |
758 | { | |
6dccd6c1 JD |
759 | if (copy_from_user(&old_chan_param, |
760 | (struct lttng_kernel_old_channel __user *) arg, | |
761 | sizeof(struct lttng_kernel_old_channel))) | |
762 | return -EFAULT; | |
763 | chan_param.overwrite = old_chan_param.overwrite; | |
764 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
765 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
766 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
767 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
768 | chan_param.output = old_chan_param.output; | |
769 | ||
770 | return lttng_abi_create_channel(file, &chan_param, | |
771 | METADATA_CHANNEL); | |
772 | } | |
38d024ae | 773 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 774 | { |
6dccd6c1 JD |
775 | if (copy_from_user(&chan_param, |
776 | (struct lttng_kernel_channel __user *) arg, | |
777 | sizeof(struct lttng_kernel_channel))) | |
778 | return -EFAULT; | |
779 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 780 | METADATA_CHANNEL); |
6dccd6c1 | 781 | } |
e0130fab | 782 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 783 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 784 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
785 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
786 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
787 | { | |
788 | struct lttng_kernel_tracker_args tracker; | |
789 | enum tracker_type tracker_type; | |
790 | ||
791 | if (copy_from_user(&tracker, | |
792 | (struct lttng_kernel_tracker_args __user *) arg, | |
793 | sizeof(struct lttng_kernel_tracker_args))) | |
794 | return -EFAULT; | |
795 | tracker_type = get_tracker_type(&tracker); | |
796 | if (tracker_type == TRACKER_UNKNOWN) | |
797 | return -EINVAL; | |
798 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
799 | } | |
800 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
801 | { | |
802 | struct lttng_kernel_tracker_args tracker; | |
803 | enum tracker_type tracker_type; | |
804 | ||
805 | if (copy_from_user(&tracker, | |
806 | (struct lttng_kernel_tracker_args __user *) arg, | |
807 | sizeof(struct lttng_kernel_tracker_args))) | |
808 | return -EFAULT; | |
809 | tracker_type = get_tracker_type(&tracker); | |
810 | if (tracker_type == TRACKER_UNKNOWN) | |
811 | return -EINVAL; | |
812 | return lttng_session_untrack_id(session, tracker_type, | |
813 | tracker.id); | |
814 | } | |
7e6f9ef6 | 815 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
816 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
817 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
818 | { | |
819 | struct lttng_kernel_tracker_args tracker; | |
820 | enum tracker_type tracker_type; | |
821 | ||
822 | if (copy_from_user(&tracker, | |
823 | (struct lttng_kernel_tracker_args __user *) arg, | |
824 | sizeof(struct lttng_kernel_tracker_args))) | |
825 | return -EFAULT; | |
826 | tracker_type = get_tracker_type(&tracker); | |
827 | if (tracker_type == TRACKER_UNKNOWN) | |
828 | return -EINVAL; | |
829 | return lttng_session_list_tracker_ids(session, tracker_type); | |
830 | } | |
9616f0bf JD |
831 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
832 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
833 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
834 | return lttng_session_statedump(session); | |
7f859fbf JR |
835 | case LTTNG_KERNEL_SESSION_SET_NAME: |
836 | { | |
837 | struct lttng_kernel_session_name name; | |
838 | ||
839 | if (copy_from_user(&name, | |
840 | (struct lttng_kernel_session_name __user *) arg, | |
841 | sizeof(struct lttng_kernel_session_name))) | |
842 | return -EFAULT; | |
843 | return lttng_abi_session_set_name(session, &name); | |
844 | } | |
1c88f269 JR |
845 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
846 | { | |
847 | struct lttng_kernel_session_creation_time time; | |
848 | ||
849 | if (copy_from_user(&time, | |
850 | (struct lttng_kernel_session_creation_time __user *) arg, | |
851 | sizeof(struct lttng_kernel_session_creation_time))) | |
852 | return -EFAULT; | |
853 | return lttng_abi_session_set_creation_time(session, &time); | |
854 | } | |
ad1c05e1 MD |
855 | default: |
856 | return -ENOIOCTLCMD; | |
857 | } | |
858 | } | |
859 | ||
03037b98 MD |
860 | /* |
861 | * Called when the last file reference is dropped. | |
862 | * | |
863 | * Big fat note: channels and events are invariant for the whole session after | |
864 | * their creation. So this session destruction also destroys all channel and | |
865 | * event structures specific to this session (they are not destroyed when their | |
866 | * individual file is released). | |
867 | */ | |
ad1c05e1 | 868 | static |
03037b98 | 869 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 870 | { |
a90917c3 | 871 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
872 | |
873 | if (session) | |
a90917c3 | 874 | lttng_session_destroy(session); |
11b5a3c2 | 875 | return 0; |
ad1c05e1 | 876 | } |
ad1c05e1 MD |
877 | |
878 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 879 | .owner = THIS_MODULE, |
03037b98 | 880 | .release = lttng_session_release, |
ad1c05e1 MD |
881 | .unlocked_ioctl = lttng_session_ioctl, |
882 | #ifdef CONFIG_COMPAT | |
03037b98 | 883 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 884 | #endif |
11b5a3c2 | 885 | }; |
ad1c05e1 | 886 | |
4442bc1b JR |
887 | /* |
888 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
889 | * and retry (if new data available to read after flush). | |
890 | */ | |
891 | static | |
892 | ssize_t lttng_trigger_group_notif_read(struct file *filp, char __user *user_buf, | |
893 | size_t count, loff_t *ppos) | |
894 | { | |
895 | struct lttng_trigger_group *trigger_group = filp->private_data; | |
896 | struct channel *chan = trigger_group->chan; | |
897 | struct lib_ring_buffer *buf = trigger_group->buf; | |
898 | ssize_t read_count = 0, len; | |
899 | size_t read_offset; | |
900 | ||
901 | might_sleep(); | |
902 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
903 | return -EFAULT; | |
904 | ||
905 | /* Finish copy of previous record */ | |
906 | if (*ppos != 0) { | |
907 | if (read_count < count) { | |
908 | len = chan->iter.len_left; | |
909 | read_offset = *ppos; | |
910 | goto skip_get_next; | |
911 | } | |
912 | } | |
913 | ||
914 | while (read_count < count) { | |
915 | size_t copy_len, space_left; | |
916 | ||
917 | len = lib_ring_buffer_get_next_record(chan, buf); | |
918 | len_test: | |
919 | if (len < 0) { | |
920 | /* | |
921 | * Check if buffer is finalized (end of file). | |
922 | */ | |
923 | if (len == -ENODATA) { | |
924 | /* A 0 read_count will tell about end of file */ | |
925 | goto nodata; | |
926 | } | |
927 | if (filp->f_flags & O_NONBLOCK) { | |
928 | if (!read_count) | |
929 | read_count = -EAGAIN; | |
930 | goto nodata; | |
931 | } else { | |
932 | int error; | |
933 | ||
934 | /* | |
935 | * No data available at the moment, return what | |
936 | * we got. | |
937 | */ | |
938 | if (read_count) | |
939 | goto nodata; | |
940 | ||
941 | /* | |
942 | * Wait for returned len to be >= 0 or -ENODATA. | |
943 | */ | |
944 | error = wait_event_interruptible( | |
945 | trigger_group->read_wait, | |
946 | ((len = lib_ring_buffer_get_next_record( | |
947 | chan, buf)), len != -EAGAIN)); | |
948 | CHAN_WARN_ON(chan, len == -EBUSY); | |
949 | if (error) { | |
950 | read_count = error; | |
951 | goto nodata; | |
952 | } | |
953 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
954 | goto len_test; | |
955 | } | |
956 | } | |
957 | read_offset = buf->iter.read_offset; | |
958 | skip_get_next: | |
959 | space_left = count - read_count; | |
960 | if (len <= space_left) { | |
961 | copy_len = len; | |
962 | chan->iter.len_left = 0; | |
963 | *ppos = 0; | |
964 | } else { | |
965 | copy_len = space_left; | |
966 | chan->iter.len_left = len - copy_len; | |
967 | *ppos = read_offset + copy_len; | |
968 | } | |
969 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
970 | &user_buf[read_count], | |
971 | copy_len)) { | |
972 | /* | |
973 | * Leave the len_left and ppos values at their current | |
974 | * state, as we currently have a valid event to read. | |
975 | */ | |
976 | return -EFAULT; | |
977 | } | |
978 | read_count += copy_len; | |
979 | } | |
980 | goto put_record; | |
981 | ||
982 | nodata: | |
983 | *ppos = 0; | |
984 | chan->iter.len_left = 0; | |
985 | ||
986 | put_record: | |
987 | lib_ring_buffer_put_current_record(buf); | |
988 | return read_count; | |
989 | } | |
990 | ||
991 | /* | |
992 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
993 | * there is data available. Perform a ring buffer flush if we encounter a | |
994 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
995 | */ | |
996 | static | |
997 | unsigned int lttng_trigger_group_notif_poll(struct file *filp, | |
998 | poll_table *wait) | |
999 | { | |
1000 | unsigned int mask = 0; | |
1001 | struct lttng_trigger_group *trigger_group = filp->private_data; | |
1002 | struct channel *chan = trigger_group->chan; | |
1003 | struct lib_ring_buffer *buf = trigger_group->buf; | |
1004 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1005 | int finalized, disabled; | |
1006 | unsigned long consumed, offset; | |
1007 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); | |
1008 | ||
1009 | if (filp->f_mode & FMODE_READ) { | |
1010 | poll_wait_set_exclusive(wait); | |
1011 | poll_wait(filp, &trigger_group->read_wait, wait); | |
1012 | ||
1013 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
1014 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
1015 | ||
1016 | /* | |
1017 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
1018 | * finalized load before offsets loads. | |
1019 | */ | |
1020 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1021 | retry: | |
1022 | if (disabled) | |
1023 | return POLLERR; | |
1024 | ||
1025 | offset = lib_ring_buffer_get_offset(config, buf); | |
1026 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
1027 | ||
1028 | /* | |
1029 | * If there is no buffer available to consume. | |
1030 | */ | |
1031 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
1032 | /* | |
1033 | * If there is a non-empty subbuffer, flush and try again. | |
1034 | */ | |
1035 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { | |
1036 | lib_ring_buffer_switch_remote(buf); | |
1037 | goto retry; | |
1038 | } | |
1039 | ||
1040 | if (finalized) | |
1041 | return POLLHUP; | |
1042 | else { | |
1043 | /* | |
1044 | * The memory barriers | |
1045 | * __wait_event()/wake_up_interruptible() take | |
1046 | * care of "raw_spin_is_locked" memory ordering. | |
1047 | */ | |
1048 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
1049 | goto retry; | |
1050 | else | |
1051 | return 0; | |
1052 | } | |
1053 | } else { | |
1054 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
1055 | >= chan->backend.buf_size) | |
1056 | return POLLPRI | POLLRDBAND; | |
1057 | else | |
1058 | return POLLIN | POLLRDNORM; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | return mask; | |
1063 | } | |
1064 | ||
1065 | /** | |
1066 | * lttng_trigger_group_notif_open - trigger ring buffer open file operation | |
1067 | * @inode: opened inode | |
1068 | * @file: opened file | |
1069 | * | |
1070 | * Open implementation. Makes sure only one open instance of a buffer is | |
1071 | * done at a given moment. | |
1072 | */ | |
1073 | static int lttng_trigger_group_notif_open(struct inode *inode, struct file *file) | |
1074 | { | |
1075 | struct lttng_trigger_group *trigger_group = inode->i_private; | |
1076 | struct lib_ring_buffer *buf = trigger_group->buf; | |
1077 | ||
1078 | file->private_data = trigger_group; | |
1079 | return lib_ring_buffer_open(inode, file, buf); | |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * lttng_trigger_group_notif_release - trigger ring buffer release file operation | |
1084 | * @inode: opened inode | |
1085 | * @file: opened file | |
1086 | * | |
1087 | * Release implementation. | |
1088 | */ | |
1089 | static int lttng_trigger_group_notif_release(struct inode *inode, struct file *file) | |
1090 | { | |
1091 | struct lttng_trigger_group *trigger_group = file->private_data; | |
1092 | struct lib_ring_buffer *buf = trigger_group->buf; | |
1093 | int ret; | |
1094 | ||
1095 | ret = lib_ring_buffer_release(inode, file, buf); | |
1096 | if (ret) | |
1097 | return ret; | |
1098 | fput(trigger_group->file); | |
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | static const struct file_operations lttng_trigger_group_notif_fops = { | |
1103 | .owner = THIS_MODULE, | |
1104 | .open = lttng_trigger_group_notif_open, | |
1105 | .release = lttng_trigger_group_notif_release, | |
1106 | .read = lttng_trigger_group_notif_read, | |
1107 | .poll = lttng_trigger_group_notif_poll, | |
1108 | }; | |
1109 | ||
d83004aa JD |
1110 | /** |
1111 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1112 | * @filp: the file | |
1113 | * @wait: poll table | |
1114 | * | |
1115 | * Handles the poll operations for the metadata channels. | |
1116 | */ | |
ad1c05e1 | 1117 | static |
d83004aa JD |
1118 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1119 | poll_table *wait) | |
1120 | { | |
1121 | struct lttng_metadata_stream *stream = filp->private_data; | |
1122 | struct lib_ring_buffer *buf = stream->priv; | |
1123 | int finalized; | |
1124 | unsigned int mask = 0; | |
1125 | ||
1126 | if (filp->f_mode & FMODE_READ) { | |
1127 | poll_wait_set_exclusive(wait); | |
1128 | poll_wait(filp, &stream->read_wait, wait); | |
1129 | ||
1130 | finalized = stream->finalized; | |
1131 | ||
1132 | /* | |
1133 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1134 | * ordering finalized load before offsets loads. | |
1135 | */ | |
1136 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1137 | ||
1138 | if (finalized) | |
1139 | mask |= POLLHUP; | |
1140 | ||
92d9f5e6 | 1141 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1142 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1143 | stream->metadata_out) |
d83004aa | 1144 | mask |= POLLIN; |
92d9f5e6 | 1145 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1146 | } |
1147 | ||
1148 | return mask; | |
1149 | } | |
1150 | ||
f613e3e6 MD |
1151 | static |
1152 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1153 | unsigned int cmd, unsigned long arg) | |
1154 | { | |
1155 | struct lttng_metadata_stream *stream = filp->private_data; | |
1156 | ||
1157 | stream->metadata_out = stream->metadata_in; | |
1158 | } | |
1159 | ||
d1344afa JD |
1160 | /* |
1161 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1162 | * the consumer receives the content of the metadata cache unchanged. This is | |
1163 | * different from the metadata_regenerate where the offset from epoch is | |
1164 | * resampled, here we want the exact same content as the last time the metadata | |
1165 | * was generated. This command is only possible if all the metadata written | |
1166 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1167 | * metadata file. | |
1168 | * | |
1169 | * Return 0 on success, a negative value on error. | |
1170 | */ | |
1171 | static | |
1172 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1173 | { | |
1174 | int ret; | |
1175 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1176 | ||
1177 | mutex_lock(&cache->lock); | |
1178 | if (stream->metadata_out != cache->metadata_written) { | |
1179 | ret = -EBUSY; | |
1180 | goto end; | |
1181 | } | |
1182 | stream->metadata_out = 0; | |
1183 | stream->metadata_in = 0; | |
1184 | wake_up_interruptible(&stream->read_wait); | |
1185 | ret = 0; | |
1186 | ||
1187 | end: | |
1188 | mutex_unlock(&cache->lock); | |
1189 | return ret; | |
1190 | } | |
1191 | ||
d83004aa JD |
1192 | static |
1193 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1194 | unsigned int cmd, unsigned long arg) | |
1195 | { | |
1196 | int ret; | |
1197 | struct lttng_metadata_stream *stream = filp->private_data; | |
1198 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1199 | unsigned int rb_cmd; |
1200 | bool coherent; | |
1201 | ||
1202 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1203 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1204 | else | |
1205 | rb_cmd = cmd; | |
d83004aa JD |
1206 | |
1207 | switch (cmd) { | |
d83004aa JD |
1208 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1209 | { | |
35097f36 JD |
1210 | struct lttng_metadata_stream *stream = filp->private_data; |
1211 | struct lib_ring_buffer *buf = stream->priv; | |
1212 | struct channel *chan = buf->backend.chan; | |
1213 | ||
8b97fd42 | 1214 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1215 | if (ret > 0) { |
1216 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1217 | ret = 0; | |
1218 | } else if (ret < 0) | |
d83004aa JD |
1219 | goto err; |
1220 | break; | |
1221 | } | |
f613e3e6 MD |
1222 | case RING_BUFFER_GET_SUBBUF: |
1223 | { | |
1224 | /* | |
1225 | * Random access is not allowed for metadata channel. | |
1226 | */ | |
1227 | return -ENOSYS; | |
1228 | } | |
c6f05468 | 1229 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
1230 | case RING_BUFFER_FLUSH: |
1231 | { | |
1232 | struct lttng_metadata_stream *stream = filp->private_data; | |
1233 | struct lib_ring_buffer *buf = stream->priv; | |
1234 | struct channel *chan = buf->backend.chan; | |
1235 | ||
1236 | /* | |
1237 | * Before doing the actual ring buffer flush, write up to one | |
1238 | * packet of metadata in the ring buffer. | |
1239 | */ | |
8b97fd42 | 1240 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1241 | if (ret < 0) |
1242 | goto err; | |
1243 | break; | |
1244 | } | |
9616f0bf JD |
1245 | case RING_BUFFER_GET_METADATA_VERSION: |
1246 | { | |
1247 | struct lttng_metadata_stream *stream = filp->private_data; | |
1248 | ||
1249 | return put_u64(stream->version, arg); | |
1250 | } | |
d1344afa JD |
1251 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1252 | { | |
1253 | struct lttng_metadata_stream *stream = filp->private_data; | |
1254 | ||
1255 | return lttng_metadata_cache_dump(stream); | |
1256 | } | |
8b97fd42 MD |
1257 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1258 | { | |
1259 | struct lttng_metadata_stream *stream = filp->private_data; | |
1260 | struct lib_ring_buffer *buf = stream->priv; | |
1261 | struct channel *chan = buf->backend.chan; | |
1262 | ||
1263 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1264 | if (ret > 0) { | |
1265 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1266 | ret = 0; | |
1267 | } else if (ret < 0) { | |
1268 | goto err; | |
1269 | } | |
1270 | break; | |
1271 | } | |
d83004aa JD |
1272 | default: |
1273 | break; | |
1274 | } | |
f613e3e6 MD |
1275 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1276 | ||
d83004aa | 1277 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1278 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1279 | if (ret < 0) |
1280 | goto err; | |
d83004aa | 1281 | |
f613e3e6 MD |
1282 | switch (cmd) { |
1283 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1284 | { | |
1285 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1286 | cmd, arg); | |
1287 | break; | |
1288 | } | |
8b97fd42 MD |
1289 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1290 | { | |
1291 | return put_u32(coherent, arg); | |
1292 | } | |
f613e3e6 MD |
1293 | default: |
1294 | break; | |
1295 | } | |
d83004aa JD |
1296 | err: |
1297 | return ret; | |
1298 | } | |
1299 | ||
aeb9064d | 1300 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1301 | static |
1302 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1303 | unsigned int cmd, unsigned long arg) | |
1304 | { | |
1305 | int ret; | |
1306 | struct lttng_metadata_stream *stream = filp->private_data; | |
1307 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1308 | unsigned int rb_cmd; |
1309 | bool coherent; | |
1310 | ||
1311 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1312 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1313 | else | |
1314 | rb_cmd = cmd; | |
d83004aa JD |
1315 | |
1316 | switch (cmd) { | |
d83004aa JD |
1317 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1318 | { | |
35097f36 JD |
1319 | struct lttng_metadata_stream *stream = filp->private_data; |
1320 | struct lib_ring_buffer *buf = stream->priv; | |
1321 | struct channel *chan = buf->backend.chan; | |
1322 | ||
8b97fd42 | 1323 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1324 | if (ret > 0) { |
1325 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1326 | ret = 0; | |
1327 | } else if (ret < 0) | |
d83004aa JD |
1328 | goto err; |
1329 | break; | |
1330 | } | |
f613e3e6 MD |
1331 | case RING_BUFFER_GET_SUBBUF: |
1332 | { | |
1333 | /* | |
1334 | * Random access is not allowed for metadata channel. | |
1335 | */ | |
1336 | return -ENOSYS; | |
1337 | } | |
c6f05468 | 1338 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1339 | case RING_BUFFER_FLUSH: |
1340 | { | |
1341 | struct lttng_metadata_stream *stream = filp->private_data; | |
1342 | struct lib_ring_buffer *buf = stream->priv; | |
1343 | struct channel *chan = buf->backend.chan; | |
1344 | ||
1345 | /* | |
1346 | * Before doing the actual ring buffer flush, write up to one | |
1347 | * packet of metadata in the ring buffer. | |
1348 | */ | |
8b97fd42 | 1349 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1350 | if (ret < 0) |
1351 | goto err; | |
1352 | break; | |
1353 | } | |
1354 | case RING_BUFFER_GET_METADATA_VERSION: | |
1355 | { | |
1356 | struct lttng_metadata_stream *stream = filp->private_data; | |
1357 | ||
1358 | return put_u64(stream->version, arg); | |
1359 | } | |
d1344afa JD |
1360 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1361 | { | |
1362 | struct lttng_metadata_stream *stream = filp->private_data; | |
1363 | ||
1364 | return lttng_metadata_cache_dump(stream); | |
1365 | } | |
8b97fd42 MD |
1366 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1367 | { | |
1368 | struct lttng_metadata_stream *stream = filp->private_data; | |
1369 | struct lib_ring_buffer *buf = stream->priv; | |
1370 | struct channel *chan = buf->backend.chan; | |
1371 | ||
1372 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1373 | if (ret > 0) { | |
1374 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1375 | ret = 0; | |
1376 | } else if (ret < 0) { | |
1377 | goto err; | |
1378 | } | |
1379 | break; | |
1380 | } | |
d83004aa JD |
1381 | default: |
1382 | break; | |
1383 | } | |
f613e3e6 MD |
1384 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1385 | ||
d83004aa | 1386 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1387 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1388 | if (ret < 0) |
1389 | goto err; | |
d83004aa | 1390 | |
f613e3e6 MD |
1391 | switch (cmd) { |
1392 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1393 | { | |
1394 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1395 | cmd, arg); | |
1396 | break; | |
1397 | } | |
8b97fd42 MD |
1398 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1399 | { | |
1400 | return put_u32(coherent, arg); | |
1401 | } | |
f613e3e6 MD |
1402 | default: |
1403 | break; | |
1404 | } | |
d83004aa JD |
1405 | err: |
1406 | return ret; | |
1407 | } | |
aeb9064d | 1408 | #endif |
d83004aa | 1409 | |
b3b8072b MD |
1410 | /* |
1411 | * This is not used by anonymous file descriptors. This code is left | |
1412 | * there if we ever want to implement an inode with open() operation. | |
1413 | */ | |
d83004aa JD |
1414 | static |
1415 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1416 | { | |
1417 | struct lttng_metadata_stream *stream = inode->i_private; | |
1418 | struct lib_ring_buffer *buf = stream->priv; | |
1419 | ||
1420 | file->private_data = buf; | |
b3b8072b MD |
1421 | /* |
1422 | * Since life-time of metadata cache differs from that of | |
1423 | * session, we need to keep our own reference on the transport. | |
1424 | */ | |
1425 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1426 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1427 | return -EBUSY; |
1428 | } | |
d83004aa JD |
1429 | return lib_ring_buffer_open(inode, file, buf); |
1430 | } | |
1431 | ||
1432 | static | |
1433 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1434 | { | |
1435 | struct lttng_metadata_stream *stream = file->private_data; | |
1436 | struct lib_ring_buffer *buf = stream->priv; | |
1437 | ||
92143b2c MD |
1438 | mutex_lock(&stream->metadata_cache->lock); |
1439 | list_del(&stream->list); | |
1440 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1441 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1442 | module_put(stream->transport->owner); |
92143b2c | 1443 | kfree(stream); |
d83004aa JD |
1444 | return lib_ring_buffer_release(inode, file, buf); |
1445 | } | |
1446 | ||
1447 | static | |
1448 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1449 | struct pipe_inode_info *pipe, size_t len, | |
1450 | unsigned int flags) | |
1451 | { | |
1452 | struct lttng_metadata_stream *stream = in->private_data; | |
1453 | struct lib_ring_buffer *buf = stream->priv; | |
1454 | ||
1455 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1456 | flags, buf); | |
1457 | } | |
1458 | ||
1459 | static | |
1460 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1461 | struct vm_area_struct *vma) | |
1462 | { | |
1463 | struct lttng_metadata_stream *stream = filp->private_data; | |
1464 | struct lib_ring_buffer *buf = stream->priv; | |
1465 | ||
1466 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1467 | } | |
1468 | ||
1469 | static | |
1470 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1471 | .owner = THIS_MODULE, | |
1472 | .open = lttng_metadata_ring_buffer_open, | |
1473 | .release = lttng_metadata_ring_buffer_release, | |
1474 | .poll = lttng_metadata_ring_buffer_poll, | |
1475 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1476 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1477 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1478 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1479 | #ifdef CONFIG_COMPAT | |
1480 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1481 | #endif | |
1482 | }; | |
1483 | ||
1484 | static | |
1485 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
4442bc1b | 1486 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1487 | { |
ad1c05e1 | 1488 | int stream_fd, ret; |
11b5a3c2 | 1489 | struct file *stream_file; |
ad1c05e1 | 1490 | |
4ac10b76 | 1491 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1492 | if (stream_fd < 0) { |
1493 | ret = stream_fd; | |
1494 | goto fd_error; | |
1495 | } | |
4442bc1b | 1496 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1497 | if (IS_ERR(stream_file)) { |
1498 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1499 | goto file_error; |
1500 | } | |
409453cb MD |
1501 | /* |
1502 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1503 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1504 | * file descriptor, so we set FMODE_PREAD here. | |
1505 | */ | |
d7b6f197 | 1506 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1507 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1508 | /* |
1509 | * The stream holds a reference to the channel within the generic ring | |
1510 | * buffer library, so no need to hold a refcount on the channel and | |
1511 | * session files here. | |
1512 | */ | |
ad1c05e1 MD |
1513 | return stream_fd; |
1514 | ||
1515 | file_error: | |
1516 | put_unused_fd(stream_fd); | |
d83004aa JD |
1517 | fd_error: |
1518 | return ret; | |
1519 | } | |
1520 | ||
1521 | static | |
1522 | int lttng_abi_open_stream(struct file *channel_file) | |
1523 | { | |
1524 | struct lttng_channel *channel = channel_file->private_data; | |
1525 | struct lib_ring_buffer *buf; | |
1526 | int ret; | |
1527 | void *stream_priv; | |
1528 | ||
1529 | buf = channel->ops->buffer_read_open(channel->chan); | |
1530 | if (!buf) | |
1531 | return -ENOENT; | |
1532 | ||
1533 | stream_priv = buf; | |
1534 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
4442bc1b JR |
1535 | <tng_stream_ring_buffer_file_operations, |
1536 | "[lttng_stream]"); | |
d83004aa JD |
1537 | if (ret < 0) |
1538 | goto fd_error; | |
1539 | ||
1540 | return ret; | |
1541 | ||
1542 | fd_error: | |
1543 | channel->ops->buffer_read_close(buf); | |
1544 | return ret; | |
1545 | } | |
1546 | ||
1547 | static | |
1548 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1549 | { | |
1550 | struct lttng_channel *channel = channel_file->private_data; | |
1551 | struct lttng_session *session = channel->session; | |
1552 | struct lib_ring_buffer *buf; | |
1553 | int ret; | |
1554 | struct lttng_metadata_stream *metadata_stream; | |
1555 | void *stream_priv; | |
1556 | ||
1557 | buf = channel->ops->buffer_read_open(channel->chan); | |
1558 | if (!buf) | |
1559 | return -ENOENT; | |
1560 | ||
1561 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1562 | GFP_KERNEL); | |
b3b8072b MD |
1563 | if (!metadata_stream) { |
1564 | ret = -ENOMEM; | |
1565 | goto nomem; | |
1566 | } | |
d83004aa JD |
1567 | metadata_stream->metadata_cache = session->metadata_cache; |
1568 | init_waitqueue_head(&metadata_stream->read_wait); | |
1569 | metadata_stream->priv = buf; | |
1570 | stream_priv = metadata_stream; | |
b3b8072b | 1571 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
1572 | /* Initial state is an empty metadata, considered as incoherent. */ |
1573 | metadata_stream->coherent = false; | |
b3b8072b MD |
1574 | |
1575 | /* | |
1576 | * Since life-time of metadata cache differs from that of | |
1577 | * session, we need to keep our own reference on the transport. | |
1578 | */ | |
1579 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1580 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1581 | ret = -EINVAL; |
1582 | goto notransport; | |
1583 | } | |
1584 | ||
901aaa5f FD |
1585 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1586 | ret = -EOVERFLOW; | |
9c1f4643 | 1587 | goto kref_error; |
901aaa5f FD |
1588 | } |
1589 | ||
d83004aa | 1590 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
4442bc1b JR |
1591 | <tng_metadata_ring_buffer_file_operations, |
1592 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1593 | if (ret < 0) |
1594 | goto fd_error; | |
1595 | ||
92143b2c | 1596 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1597 | list_add(&metadata_stream->list, |
1598 | &session->metadata_cache->metadata_stream); | |
92143b2c | 1599 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1600 | return ret; |
1601 | ||
ad1c05e1 | 1602 | fd_error: |
9c1f4643 MD |
1603 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1604 | kref_error: | |
b3b8072b MD |
1605 | module_put(metadata_stream->transport->owner); |
1606 | notransport: | |
1607 | kfree(metadata_stream); | |
1608 | nomem: | |
11b5a3c2 | 1609 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1610 | return ret; |
1611 | } | |
1612 | ||
4442bc1b JR |
1613 | static |
1614 | int lttng_abi_open_trigger_group_stream(struct file *notif_file) | |
1615 | { | |
1616 | struct lttng_trigger_group *trigger_group = notif_file->private_data; | |
1617 | struct channel *chan = trigger_group->chan; | |
1618 | struct lib_ring_buffer *buf; | |
1619 | int ret; | |
1620 | void *stream_priv; | |
1621 | ||
1622 | buf = trigger_group->ops->buffer_read_open(chan); | |
1623 | if (!buf) | |
1624 | return -ENOENT; | |
1625 | ||
1626 | /* The trigger notification fd holds a reference on the trigger group */ | |
1627 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1628 | ret = -EOVERFLOW; | |
1629 | goto refcount_error; | |
1630 | } | |
1631 | trigger_group->buf = buf; | |
1632 | stream_priv = trigger_group; | |
1633 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1634 | <tng_trigger_group_notif_fops, | |
1635 | "[lttng_trigger_stream]"); | |
1636 | if (ret < 0) | |
1637 | goto fd_error; | |
1638 | ||
1639 | return ret; | |
1640 | ||
1641 | fd_error: | |
1642 | atomic_long_dec(¬if_file->f_count); | |
1643 | refcount_error: | |
1644 | trigger_group->ops->buffer_read_close(buf); | |
1645 | return ret; | |
1646 | } | |
1647 | ||
badfe9f5 MD |
1648 | static |
1649 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
1650 | { | |
1651 | /* Limit ABI to implemented features. */ | |
1652 | switch (event_param->instrumentation) { | |
1653 | case LTTNG_KERNEL_SYSCALL: | |
1654 | switch (event_param->u.syscall.entryexit) { | |
1655 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1656 | break; | |
1657 | default: | |
1658 | return -EINVAL; | |
1659 | } | |
1660 | switch (event_param->u.syscall.abi) { | |
1661 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1662 | break; | |
1663 | default: | |
1664 | return -EINVAL; | |
1665 | } | |
1666 | switch (event_param->u.syscall.match) { | |
1667 | case LTTNG_SYSCALL_MATCH_NAME: | |
1668 | break; | |
1669 | default: | |
1670 | return -EINVAL; | |
1671 | } | |
1672 | break; | |
1673 | ||
1674 | case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */ | |
1675 | case LTTNG_KERNEL_KPROBE: /* Fallthrough */ | |
1676 | case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */ | |
1677 | case LTTNG_KERNEL_NOOP: /* Fallthrough */ | |
1678 | case LTTNG_KERNEL_UPROBE: | |
1679 | break; | |
1680 | ||
1681 | case LTTNG_KERNEL_FUNCTION: /* Fallthrough */ | |
1682 | default: | |
1683 | return -EINVAL; | |
1684 | } | |
1685 | return 0; | |
1686 | } | |
1687 | ||
653fe716 | 1688 | static |
c0e31d2e | 1689 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1690 | struct lttng_kernel_event *event_param) |
653fe716 | 1691 | { |
a90917c3 | 1692 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1693 | int event_fd, ret; |
11b5a3c2 | 1694 | struct file *event_file; |
3c997079 | 1695 | void *priv; |
653fe716 | 1696 | |
6dccd6c1 JD |
1697 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1698 | switch (event_param->instrumentation) { | |
7371f44c | 1699 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1700 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1701 | break; |
ab2277d6 | 1702 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1703 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1704 | break; |
ab2277d6 | 1705 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1706 | WARN_ON_ONCE(1); |
1707 | /* Not implemented. */ | |
e0a7a7c4 MD |
1708 | break; |
1709 | default: | |
1710 | break; | |
1711 | } | |
33a39a3c MD |
1712 | event_fd = lttng_get_unused_fd(); |
1713 | if (event_fd < 0) { | |
1714 | ret = event_fd; | |
1715 | goto fd_error; | |
1716 | } | |
1717 | event_file = anon_inode_getfile("[lttng_event]", | |
1718 | <tng_event_fops, | |
1719 | NULL, O_RDWR); | |
1720 | if (IS_ERR(event_file)) { | |
1721 | ret = PTR_ERR(event_file); | |
1722 | goto file_error; | |
1723 | } | |
9c1f4643 | 1724 | /* The event holds a reference on the channel */ |
98d7281c | 1725 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1726 | ret = -EOVERFLOW; |
9c1f4643 MD |
1727 | goto refcount_error; |
1728 | } | |
badfe9f5 MD |
1729 | ret = lttng_abi_validate_event_param(event_param); |
1730 | if (ret) | |
1731 | goto event_error; | |
33a39a3c MD |
1732 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1733 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
4442bc1b | 1734 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1735 | |
4993071a PP |
1736 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1737 | /* | |
1738 | * If the event name is a star globbing pattern, | |
1739 | * we create the special star globbing enabler. | |
1740 | */ | |
4442bc1b | 1741 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1742 | event_param, channel); |
3c997079 | 1743 | } else { |
4442bc1b | 1744 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1745 | event_param, channel); |
1ec65de1 | 1746 | } |
4442bc1b | 1747 | priv = event_enabler; |
33a39a3c MD |
1748 | } else { |
1749 | struct lttng_event *event; | |
4ee2453d | 1750 | |
33a39a3c MD |
1751 | /* |
1752 | * We tolerate no failure path after event creation. It | |
1753 | * will stay invariant for the rest of the session. | |
1754 | */ | |
1755 | event = lttng_event_create(channel, event_param, | |
1756 | NULL, NULL, | |
1757 | event_param->instrumentation); | |
1758 | WARN_ON_ONCE(!event); | |
1759 | if (IS_ERR(event)) { | |
1760 | ret = PTR_ERR(event); | |
1761 | goto event_error; | |
80f87dd2 | 1762 | } |
33a39a3c | 1763 | priv = event; |
03037b98 | 1764 | } |
33a39a3c MD |
1765 | event_file->private_data = priv; |
1766 | fd_install(event_fd, event_file); | |
653fe716 MD |
1767 | return event_fd; |
1768 | ||
03037b98 | 1769 | event_error: |
9c1f4643 MD |
1770 | atomic_long_dec(&channel_file->f_count); |
1771 | refcount_error: | |
c0e31d2e | 1772 | fput(event_file); |
653fe716 MD |
1773 | file_error: |
1774 | put_unused_fd(event_fd); | |
1775 | fd_error: | |
653fe716 MD |
1776 | return ret; |
1777 | } | |
ad1c05e1 | 1778 | |
4442bc1b JR |
1779 | static |
1780 | long lttng_trigger_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1781 | { | |
1782 | struct lttng_trigger *trigger; | |
1783 | struct lttng_trigger_enabler *trigger_enabler; | |
1784 | enum lttng_event_type *evtype = file->private_data; | |
1785 | ||
1786 | switch (cmd) { | |
1787 | case LTTNG_KERNEL_ENABLE: | |
1788 | switch (*evtype) { | |
1789 | case LTTNG_TYPE_EVENT: | |
1790 | trigger = file->private_data; | |
1791 | return lttng_trigger_enable(trigger); | |
1792 | case LTTNG_TYPE_ENABLER: | |
1793 | trigger_enabler = file->private_data; | |
1794 | return lttng_trigger_enabler_enable(trigger_enabler); | |
1795 | default: | |
1796 | WARN_ON_ONCE(1); | |
1797 | return -ENOSYS; | |
1798 | } | |
1799 | case LTTNG_KERNEL_DISABLE: | |
1800 | switch (*evtype) { | |
1801 | case LTTNG_TYPE_EVENT: | |
1802 | trigger = file->private_data; | |
1803 | return lttng_trigger_disable(trigger); | |
1804 | case LTTNG_TYPE_ENABLER: | |
1805 | trigger_enabler = file->private_data; | |
1806 | return lttng_trigger_enabler_disable(trigger_enabler); | |
1807 | default: | |
1808 | WARN_ON_ONCE(1); | |
1809 | return -ENOSYS; | |
1810 | } | |
1811 | case LTTNG_KERNEL_FILTER: | |
1812 | switch (*evtype) { | |
1813 | case LTTNG_TYPE_EVENT: | |
1814 | return -EINVAL; | |
1815 | case LTTNG_TYPE_ENABLER: | |
1816 | trigger_enabler = file->private_data; | |
1817 | return lttng_trigger_enabler_attach_filter_bytecode( | |
1818 | trigger_enabler, | |
1819 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1820 | default: | |
1821 | WARN_ON_ONCE(1); | |
1822 | return -ENOSYS; | |
1823 | } | |
1824 | ||
1825 | case LTTNG_KERNEL_CAPTURE: | |
1826 | switch (*evtype) { | |
1827 | case LTTNG_TYPE_EVENT: | |
1828 | return -EINVAL; | |
1829 | case LTTNG_TYPE_ENABLER: | |
1830 | trigger_enabler = file->private_data; | |
1831 | return lttng_trigger_enabler_attach_capture_bytecode( | |
1832 | trigger_enabler, | |
1833 | (struct lttng_kernel_capture_bytecode __user *) arg); | |
1834 | default: | |
1835 | WARN_ON_ONCE(1); | |
1836 | return -ENOSYS; | |
1837 | } | |
1838 | case LTTNG_KERNEL_ADD_CALLSITE: | |
1839 | switch (*evtype) { | |
1840 | case LTTNG_TYPE_EVENT: | |
1841 | trigger = file->private_data; | |
1842 | return lttng_trigger_add_callsite(trigger, | |
1843 | (struct lttng_kernel_event_callsite __user *) arg); | |
1844 | case LTTNG_TYPE_ENABLER: | |
1845 | return -EINVAL; | |
1846 | default: | |
1847 | WARN_ON_ONCE(1); | |
1848 | return -ENOSYS; | |
1849 | } | |
1850 | default: | |
1851 | return -ENOIOCTLCMD; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | static | |
1856 | int lttng_trigger_release(struct inode *inode, struct file *file) | |
1857 | { | |
1858 | struct lttng_trigger *trigger; | |
1859 | struct lttng_trigger_enabler *trigger_enabler; | |
1860 | enum lttng_event_type *evtype = file->private_data; | |
1861 | ||
1862 | if (!evtype) | |
1863 | return 0; | |
1864 | ||
1865 | switch (*evtype) { | |
1866 | case LTTNG_TYPE_EVENT: | |
1867 | trigger = file->private_data; | |
1868 | if (trigger) | |
1869 | fput(trigger->group->file); | |
1870 | break; | |
1871 | case LTTNG_TYPE_ENABLER: | |
1872 | trigger_enabler = file->private_data; | |
1873 | if (trigger_enabler) | |
1874 | fput(trigger_enabler->group->file); | |
1875 | break; | |
1876 | default: | |
1877 | WARN_ON_ONCE(1); | |
1878 | break; | |
1879 | } | |
1880 | ||
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | static const struct file_operations lttng_trigger_fops = { | |
1885 | .owner = THIS_MODULE, | |
1886 | .release = lttng_trigger_release, | |
1887 | .unlocked_ioctl = lttng_trigger_ioctl, | |
1888 | #ifdef CONFIG_COMPAT | |
1889 | .compat_ioctl = lttng_trigger_ioctl, | |
1890 | #endif | |
1891 | }; | |
1892 | ||
1893 | static | |
1894 | int lttng_abi_create_trigger(struct file *trigger_group_file, | |
1895 | struct lttng_kernel_trigger *trigger_param) | |
1896 | { | |
1897 | struct lttng_trigger_group *trigger_group = trigger_group_file->private_data; | |
1898 | int trigger_fd, ret; | |
1899 | struct file *trigger_file; | |
1900 | void *priv; | |
1901 | ||
1902 | switch (trigger_param->instrumentation) { | |
1903 | case LTTNG_KERNEL_TRACEPOINT: | |
1904 | case LTTNG_KERNEL_UPROBE: | |
1905 | break; | |
1906 | case LTTNG_KERNEL_KPROBE: | |
1907 | trigger_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1908 | break; | |
1909 | case LTTNG_KERNEL_SYSCALL: | |
1910 | break; | |
1911 | case LTTNG_KERNEL_KRETPROBE: | |
1912 | /* Placing a trigger on kretprobe is not supported. */ | |
1913 | case LTTNG_KERNEL_FUNCTION: | |
1914 | case LTTNG_KERNEL_NOOP: | |
1915 | default: | |
1916 | ret = -EINVAL; | |
1917 | goto inval_instr; | |
1918 | } | |
1919 | ||
1920 | trigger_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1921 | ||
1922 | trigger_fd = lttng_get_unused_fd(); | |
1923 | if (trigger_fd < 0) { | |
1924 | ret = trigger_fd; | |
1925 | goto fd_error; | |
1926 | } | |
1927 | ||
1928 | trigger_file = anon_inode_getfile("[lttng_trigger]", | |
1929 | <tng_trigger_fops, | |
1930 | NULL, O_RDWR); | |
1931 | if (IS_ERR(trigger_file)) { | |
1932 | ret = PTR_ERR(trigger_file); | |
1933 | goto file_error; | |
1934 | } | |
1935 | ||
1936 | /* The trigger holds a reference on the trigger group. */ | |
1937 | if (!atomic_long_add_unless(&trigger_group_file->f_count, 1, LONG_MAX)) { | |
1938 | ret = -EOVERFLOW; | |
1939 | goto refcount_error; | |
1940 | } | |
1941 | ||
1942 | if (trigger_param->instrumentation == LTTNG_KERNEL_TRACEPOINT | |
1943 | || trigger_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1944 | struct lttng_trigger_enabler *enabler; | |
1945 | ||
1946 | if (strutils_is_star_glob_pattern(trigger_param->name)) { | |
1947 | /* | |
1948 | * If the event name is a star globbing pattern, | |
1949 | * we create the special star globbing enabler. | |
1950 | */ | |
1951 | enabler = lttng_trigger_enabler_create(trigger_group, | |
1952 | LTTNG_ENABLER_FORMAT_STAR_GLOB, trigger_param); | |
1953 | } else { | |
1954 | enabler = lttng_trigger_enabler_create(trigger_group, | |
1955 | LTTNG_ENABLER_FORMAT_NAME, trigger_param); | |
1956 | } | |
1957 | priv = enabler; | |
1958 | } else { | |
1959 | struct lttng_trigger *trigger; | |
1960 | ||
1961 | /* | |
1962 | * We tolerate no failure path after trigger creation. It | |
1963 | * will stay invariant for the rest of the session. | |
1964 | */ | |
1965 | trigger = lttng_trigger_create(NULL, trigger_param->id, | |
1966 | trigger_param->error_counter_index, | |
1967 | trigger_group, trigger_param, NULL, | |
1968 | trigger_param->instrumentation); | |
1969 | WARN_ON_ONCE(!trigger); | |
1970 | if (IS_ERR(trigger)) { | |
1971 | ret = PTR_ERR(trigger); | |
1972 | goto trigger_error; | |
1973 | } | |
1974 | priv = trigger; | |
1975 | } | |
1976 | trigger_file->private_data = priv; | |
1977 | fd_install(trigger_fd, trigger_file); | |
1978 | return trigger_fd; | |
1979 | ||
1980 | trigger_error: | |
1981 | atomic_long_dec(&trigger_group_file->f_count); | |
1982 | refcount_error: | |
1983 | fput(trigger_file); | |
1984 | file_error: | |
1985 | put_unused_fd(trigger_fd); | |
1986 | fd_error: | |
1987 | inval_instr: | |
1988 | return ret; | |
1989 | } | |
1990 | ||
1991 | static | |
1992 | long lttng_abi_trigger_group_create_error_counter( | |
1993 | struct file *trigger_group_file, | |
1994 | const struct lttng_kernel_counter_conf *error_counter_conf) | |
1995 | { | |
1996 | int counter_fd, ret; | |
1997 | char *counter_transport_name; | |
1998 | size_t counter_len; | |
1999 | struct lttng_counter *counter = NULL; | |
2000 | struct file *counter_file; | |
2001 | struct lttng_trigger_group *trigger_group = | |
2002 | (struct lttng_trigger_group *) trigger_group_file->private_data; | |
2003 | ||
2004 | if (error_counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) { | |
2005 | printk(KERN_ERR "LTTng: Trigger: Error counter of the wrong arithmetic type.\n"); | |
2006 | return -EINVAL; | |
2007 | } | |
2008 | ||
2009 | if (error_counter_conf->number_dimensions != 1) { | |
2010 | printk(KERN_ERR "LTTng: Trigger: Error counter has more than one dimension.\n"); | |
2011 | return -EINVAL; | |
2012 | } | |
2013 | ||
2014 | switch (error_counter_conf->bitness) { | |
2015 | case LTTNG_KERNEL_COUNTER_BITNESS_64BITS: | |
2016 | counter_transport_name = "counter-per-cpu-64-modular"; | |
2017 | break; | |
2018 | case LTTNG_KERNEL_COUNTER_BITNESS_32BITS: | |
2019 | counter_transport_name = "counter-per-cpu-32-modular"; | |
2020 | break; | |
2021 | default: | |
2022 | return -EINVAL; | |
2023 | } | |
2024 | ||
2025 | mutex_lock(&trigger_group_mutex); | |
2026 | ||
2027 | counter_fd = lttng_get_unused_fd(); | |
2028 | if (counter_fd < 0) { | |
2029 | ret = counter_fd; | |
2030 | goto fd_error; | |
2031 | } | |
2032 | ||
2033 | /* FIXME: Does it need to be RDWR ?*/ | |
2034 | counter_file = anon_inode_getfile("[lttng_counter]", | |
2035 | <tng_counter_fops, | |
2036 | NULL, O_RDWR); | |
2037 | if (IS_ERR(counter_file)) { | |
2038 | ret = PTR_ERR(counter_file); | |
2039 | goto file_error; | |
2040 | } | |
2041 | ||
2042 | counter_len = error_counter_conf->dimensions[0].size; | |
2043 | ||
2044 | if (!atomic_long_add_unless(&trigger_group_file->f_count, 1, LONG_MAX)) { | |
2045 | ret = -EOVERFLOW; | |
2046 | goto refcount_error; | |
2047 | } | |
2048 | ||
2049 | counter = lttng_kernel_counter_create(counter_transport_name, | |
2050 | 1, &counter_len); | |
2051 | if (!counter) { | |
2052 | ret = -EINVAL; | |
2053 | goto counter_error; | |
2054 | } | |
2055 | ||
2056 | trigger_group->error_counter = counter; | |
2057 | trigger_group->error_counter_len = counter_len; | |
2058 | ||
2059 | counter->file = counter_file; | |
2060 | counter->owner = trigger_group->file; | |
2061 | counter_file->private_data = counter; | |
2062 | /* Ownership transferred. */ | |
2063 | counter = NULL; | |
2064 | ||
2065 | fd_install(counter_fd, counter_file); | |
2066 | mutex_unlock(&trigger_group_mutex); | |
2067 | ||
2068 | return counter_fd; | |
2069 | ||
2070 | counter_error: | |
2071 | atomic_long_dec(&trigger_group_file->f_count); | |
2072 | refcount_error: | |
2073 | fput(counter_file); | |
2074 | file_error: | |
2075 | put_unused_fd(counter_fd); | |
2076 | fd_error: | |
2077 | return ret; | |
2078 | } | |
2079 | ||
2080 | static | |
2081 | long lttng_trigger_group_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2082 | { | |
2083 | switch (cmd) { | |
2084 | case LTTNG_KERNEL_TRIGGER_GROUP_NOTIFICATION_FD: | |
2085 | { | |
2086 | return lttng_abi_open_trigger_group_stream(file); | |
2087 | } | |
2088 | case LTTNG_KERNEL_TRIGGER_CREATE: | |
2089 | { | |
2090 | struct lttng_kernel_trigger utrigger_param; | |
2091 | ||
2092 | if (copy_from_user(&utrigger_param, | |
2093 | (struct lttng_kernel_trigger __user *) arg, | |
2094 | sizeof(utrigger_param))) | |
2095 | return -EFAULT; | |
2096 | return lttng_abi_create_trigger(file, &utrigger_param); | |
2097 | } | |
2098 | case LTTNG_KERNEL_COUNTER: | |
2099 | { | |
2100 | struct lttng_kernel_counter_conf uerror_counter_conf; | |
2101 | ||
2102 | if (copy_from_user(&uerror_counter_conf, | |
2103 | (struct lttng_kernel_counter_conf __user *) arg, | |
2104 | sizeof(uerror_counter_conf))) | |
2105 | return -EFAULT; | |
2106 | return lttng_abi_trigger_group_create_error_counter(file, | |
2107 | &uerror_counter_conf); | |
2108 | } | |
2109 | default: | |
2110 | return -ENOIOCTLCMD; | |
2111 | } | |
2112 | return 0; | |
2113 | } | |
2114 | ||
2115 | static | |
2116 | int lttng_trigger_group_release(struct inode *inode, struct file *file) | |
2117 | { | |
2118 | struct lttng_trigger_group *trigger_group = file->private_data; | |
2119 | ||
2120 | if (trigger_group) | |
2121 | lttng_trigger_group_destroy(trigger_group); | |
2122 | return 0; | |
2123 | } | |
2124 | ||
2125 | static const struct file_operations lttng_trigger_group_fops = { | |
2126 | .owner = THIS_MODULE, | |
2127 | .release = lttng_trigger_group_release, | |
2128 | .unlocked_ioctl = lttng_trigger_group_ioctl, | |
2129 | #ifdef CONFIG_COMPAT | |
2130 | .compat_ioctl = lttng_trigger_group_ioctl, | |
2131 | #endif | |
2132 | }; | |
2133 | ||
ad1c05e1 MD |
2134 | /** |
2135 | * lttng_channel_ioctl - lttng syscall through ioctl | |
2136 | * | |
c0e31d2e | 2137 | * @file: the file |
ad1c05e1 MD |
2138 | * @cmd: the command |
2139 | * @arg: command arg | |
2140 | * | |
2141 | * This ioctl implements lttng commands: | |
38d024ae | 2142 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
2143 | * Returns an event stream file descriptor or failure. |
2144 | * (typically, one event stream records events from one CPU) | |
38d024ae | 2145 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 2146 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
2147 | * LTTNG_KERNEL_CONTEXT |
2148 | * Prepend a context field to each event in the channel | |
e64957da MD |
2149 | * LTTNG_KERNEL_ENABLE |
2150 | * Enable recording for events in this channel (weak enable) | |
2151 | * LTTNG_KERNEL_DISABLE | |
2152 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 2153 | * |
baf20995 MD |
2154 | * Channel and event file descriptors also hold a reference on the session. |
2155 | */ | |
ad1c05e1 | 2156 | static |
c0e31d2e | 2157 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 2158 | { |
a90917c3 | 2159 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 2160 | |
baf20995 | 2161 | switch (cmd) { |
6dccd6c1 | 2162 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2163 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 2164 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
2165 | case LTTNG_KERNEL_OLD_EVENT: |
2166 | { | |
2167 | struct lttng_kernel_event *uevent_param; | |
2168 | struct lttng_kernel_old_event *old_uevent_param; | |
2169 | int ret; | |
2170 | ||
2171 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
2172 | GFP_KERNEL); | |
2173 | if (!uevent_param) { | |
2174 | ret = -ENOMEM; | |
2175 | goto old_event_end; | |
2176 | } | |
2177 | old_uevent_param = kmalloc( | |
2178 | sizeof(struct lttng_kernel_old_event), | |
2179 | GFP_KERNEL); | |
2180 | if (!old_uevent_param) { | |
2181 | ret = -ENOMEM; | |
2182 | goto old_event_error_free_param; | |
2183 | } | |
2184 | if (copy_from_user(old_uevent_param, | |
2185 | (struct lttng_kernel_old_event __user *) arg, | |
2186 | sizeof(struct lttng_kernel_old_event))) { | |
2187 | ret = -EFAULT; | |
2188 | goto old_event_error_free_old_param; | |
2189 | } | |
2190 | ||
2191 | memcpy(uevent_param->name, old_uevent_param->name, | |
2192 | sizeof(uevent_param->name)); | |
2193 | uevent_param->instrumentation = | |
2194 | old_uevent_param->instrumentation; | |
2195 | ||
2196 | switch (old_uevent_param->instrumentation) { | |
2197 | case LTTNG_KERNEL_KPROBE: | |
2198 | uevent_param->u.kprobe.addr = | |
2199 | old_uevent_param->u.kprobe.addr; | |
2200 | uevent_param->u.kprobe.offset = | |
2201 | old_uevent_param->u.kprobe.offset; | |
2202 | memcpy(uevent_param->u.kprobe.symbol_name, | |
2203 | old_uevent_param->u.kprobe.symbol_name, | |
2204 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
2205 | break; | |
2206 | case LTTNG_KERNEL_KRETPROBE: | |
2207 | uevent_param->u.kretprobe.addr = | |
2208 | old_uevent_param->u.kretprobe.addr; | |
2209 | uevent_param->u.kretprobe.offset = | |
2210 | old_uevent_param->u.kretprobe.offset; | |
2211 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
2212 | old_uevent_param->u.kretprobe.symbol_name, | |
2213 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
2214 | break; | |
2215 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
2216 | WARN_ON_ONCE(1); |
2217 | /* Not implemented. */ | |
6dccd6c1 JD |
2218 | break; |
2219 | default: | |
2220 | break; | |
2221 | } | |
2222 | ret = lttng_abi_create_event(file, uevent_param); | |
2223 | ||
2224 | old_event_error_free_old_param: | |
2225 | kfree(old_uevent_param); | |
2226 | old_event_error_free_param: | |
2227 | kfree(uevent_param); | |
2228 | old_event_end: | |
2229 | return ret; | |
2230 | } | |
38d024ae | 2231 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
2232 | { |
2233 | struct lttng_kernel_event uevent_param; | |
2234 | ||
2235 | if (copy_from_user(&uevent_param, | |
2236 | (struct lttng_kernel_event __user *) arg, | |
2237 | sizeof(uevent_param))) | |
2238 | return -EFAULT; | |
2239 | return lttng_abi_create_event(file, &uevent_param); | |
2240 | } | |
2241 | case LTTNG_KERNEL_OLD_CONTEXT: | |
2242 | { | |
2243 | struct lttng_kernel_context *ucontext_param; | |
2244 | struct lttng_kernel_old_context *old_ucontext_param; | |
2245 | int ret; | |
2246 | ||
2247 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
2248 | GFP_KERNEL); | |
2249 | if (!ucontext_param) { | |
2250 | ret = -ENOMEM; | |
2251 | goto old_ctx_end; | |
2252 | } | |
2253 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
2254 | GFP_KERNEL); | |
2255 | if (!old_ucontext_param) { | |
2256 | ret = -ENOMEM; | |
2257 | goto old_ctx_error_free_param; | |
2258 | } | |
2259 | ||
2260 | if (copy_from_user(old_ucontext_param, | |
2261 | (struct lttng_kernel_old_context __user *) arg, | |
2262 | sizeof(struct lttng_kernel_old_context))) { | |
2263 | ret = -EFAULT; | |
2264 | goto old_ctx_error_free_old_param; | |
2265 | } | |
2266 | ucontext_param->ctx = old_ucontext_param->ctx; | |
2267 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
2268 | sizeof(ucontext_param->padding)); | |
2269 | /* only type that uses the union */ | |
2270 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
2271 | ucontext_param->u.perf_counter.type = | |
2272 | old_ucontext_param->u.perf_counter.type; | |
2273 | ucontext_param->u.perf_counter.config = | |
2274 | old_ucontext_param->u.perf_counter.config; | |
2275 | memcpy(ucontext_param->u.perf_counter.name, | |
2276 | old_ucontext_param->u.perf_counter.name, | |
2277 | sizeof(ucontext_param->u.perf_counter.name)); | |
2278 | } | |
2279 | ||
2280 | ret = lttng_abi_add_context(file, | |
2281 | ucontext_param, | |
2282 | &channel->ctx, channel->session); | |
2283 | ||
2284 | old_ctx_error_free_old_param: | |
2285 | kfree(old_ucontext_param); | |
2286 | old_ctx_error_free_param: | |
2287 | kfree(ucontext_param); | |
2288 | old_ctx_end: | |
2289 | return ret; | |
2290 | } | |
8070f5c0 | 2291 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
2292 | { |
2293 | struct lttng_kernel_context ucontext_param; | |
2294 | ||
2295 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 2296 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
2297 | sizeof(ucontext_param))) |
2298 | return -EFAULT; | |
2299 | return lttng_abi_add_context(file, | |
2300 | &ucontext_param, | |
8070f5c0 | 2301 | &channel->ctx, channel->session); |
6dccd6c1 JD |
2302 | } |
2303 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2304 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 2305 | return lttng_channel_enable(channel); |
6dccd6c1 | 2306 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2307 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 2308 | return lttng_channel_disable(channel); |
12e579db MD |
2309 | case LTTNG_KERNEL_SYSCALL_MASK: |
2310 | return lttng_channel_syscall_mask(channel, | |
2311 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
2312 | default: |
2313 | return -ENOIOCTLCMD; | |
2314 | } | |
2315 | } | |
2316 | ||
5dbbdb43 MD |
2317 | /** |
2318 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2319 | * | |
2320 | * @file: the file | |
2321 | * @cmd: the command | |
2322 | * @arg: command arg | |
2323 | * | |
2324 | * This ioctl implements lttng commands: | |
38d024ae | 2325 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
2326 | * Returns an event stream file descriptor or failure. |
2327 | * | |
2328 | * Channel and event file descriptors also hold a reference on the session. | |
2329 | */ | |
2330 | static | |
2331 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2332 | { | |
2333 | switch (cmd) { | |
6dccd6c1 | 2334 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2335 | case LTTNG_KERNEL_STREAM: |
d83004aa | 2336 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2337 | default: |
2338 | return -ENOIOCTLCMD; | |
2339 | } | |
2340 | } | |
2341 | ||
653fe716 MD |
2342 | /** |
2343 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2344 | * | |
c0e31d2e | 2345 | * @file: the file |
653fe716 MD |
2346 | * @wait: poll table |
2347 | */ | |
c0e31d2e | 2348 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2349 | { |
a90917c3 | 2350 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2351 | unsigned int mask = 0; |
2352 | ||
c0e31d2e | 2353 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2354 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2355 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2356 | wait); | |
653fe716 | 2357 | |
254ec7bc MD |
2358 | if (channel->ops->is_disabled(channel->chan)) |
2359 | return POLLERR; | |
24cedcfe | 2360 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2361 | return POLLHUP; |
f71ecafa | 2362 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2363 | return POLLIN | POLLRDNORM; |
f71ecafa | 2364 | return 0; |
653fe716 MD |
2365 | } |
2366 | return mask; | |
2367 | ||
2368 | } | |
2369 | ||
0a84a57f MD |
2370 | static |
2371 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2372 | { | |
a90917c3 | 2373 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
2374 | |
2375 | if (channel) | |
2376 | fput(channel->session->file); | |
0a84a57f MD |
2377 | return 0; |
2378 | } | |
2379 | ||
d83004aa JD |
2380 | static |
2381 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2382 | { | |
2383 | struct lttng_channel *channel = file->private_data; | |
2384 | ||
2385 | if (channel) { | |
d83004aa | 2386 | fput(channel->session->file); |
a3381417 | 2387 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2388 | } |
2389 | ||
2390 | return 0; | |
2391 | } | |
2392 | ||
ad1c05e1 | 2393 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2394 | .owner = THIS_MODULE, |
03037b98 | 2395 | .release = lttng_channel_release, |
653fe716 | 2396 | .poll = lttng_channel_poll, |
ad1c05e1 | 2397 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2398 | #ifdef CONFIG_COMPAT |
03037b98 | 2399 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2400 | #endif |
11b5a3c2 | 2401 | }; |
baf20995 | 2402 | |
5dbbdb43 | 2403 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2404 | .owner = THIS_MODULE, |
d83004aa | 2405 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2406 | .unlocked_ioctl = lttng_metadata_ioctl, |
2407 | #ifdef CONFIG_COMPAT | |
2408 | .compat_ioctl = lttng_metadata_ioctl, | |
2409 | #endif | |
2410 | }; | |
2411 | ||
8070f5c0 MD |
2412 | /** |
2413 | * lttng_event_ioctl - lttng syscall through ioctl | |
2414 | * | |
2415 | * @file: the file | |
2416 | * @cmd: the command | |
2417 | * @arg: command arg | |
2418 | * | |
2419 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
2420 | * LTTNG_KERNEL_CONTEXT |
2421 | * Prepend a context field to each record of this event | |
e64957da MD |
2422 | * LTTNG_KERNEL_ENABLE |
2423 | * Enable recording for this event (weak enable) | |
2424 | * LTTNG_KERNEL_DISABLE | |
2425 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
2426 | */ |
2427 | static | |
2428 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2429 | { | |
3c997079 | 2430 | struct lttng_event *event; |
4442bc1b | 2431 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2432 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
2433 | |
2434 | switch (cmd) { | |
6dccd6c1 JD |
2435 | case LTTNG_KERNEL_OLD_CONTEXT: |
2436 | { | |
3c997079 MD |
2437 | /* Not implemented */ |
2438 | return -ENOSYS; | |
6dccd6c1 | 2439 | } |
8070f5c0 | 2440 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 2441 | { |
3c997079 MD |
2442 | /* Not implemented */ |
2443 | return -ENOSYS; | |
6dccd6c1 JD |
2444 | } |
2445 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2446 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
2447 | switch (*evtype) { |
2448 | case LTTNG_TYPE_EVENT: | |
2449 | event = file->private_data; | |
2450 | return lttng_event_enable(event); | |
2451 | case LTTNG_TYPE_ENABLER: | |
4442bc1b JR |
2452 | event_enabler = file->private_data; |
2453 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
2454 | default: |
2455 | WARN_ON_ONCE(1); | |
2456 | return -ENOSYS; | |
2457 | } | |
6dccd6c1 | 2458 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2459 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
2460 | switch (*evtype) { |
2461 | case LTTNG_TYPE_EVENT: | |
2462 | event = file->private_data; | |
2463 | return lttng_event_disable(event); | |
2464 | case LTTNG_TYPE_ENABLER: | |
4442bc1b JR |
2465 | event_enabler = file->private_data; |
2466 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
2467 | default: |
2468 | WARN_ON_ONCE(1); | |
2469 | return -ENOSYS; | |
2470 | } | |
07dfc1d0 MD |
2471 | case LTTNG_KERNEL_FILTER: |
2472 | switch (*evtype) { | |
2473 | case LTTNG_TYPE_EVENT: | |
2474 | return -EINVAL; | |
2475 | case LTTNG_TYPE_ENABLER: | |
2476 | { | |
4442bc1b JR |
2477 | event_enabler = file->private_data; |
2478 | return lttng_event_enabler_attach_filter_bytecode( | |
2479 | event_enabler, | |
07dfc1d0 MD |
2480 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2481 | } | |
0586316f MD |
2482 | default: |
2483 | WARN_ON_ONCE(1); | |
2484 | return -ENOSYS; | |
07dfc1d0 | 2485 | } |
3aed4dca FD |
2486 | case LTTNG_KERNEL_ADD_CALLSITE: |
2487 | switch (*evtype) { | |
2488 | case LTTNG_TYPE_EVENT: | |
2489 | event = file->private_data; | |
2490 | return lttng_event_add_callsite(event, | |
2491 | (struct lttng_kernel_event_callsite __user *) arg); | |
2492 | case LTTNG_TYPE_ENABLER: | |
2493 | return -EINVAL; | |
64c147c0 MD |
2494 | default: |
2495 | WARN_ON_ONCE(1); | |
2496 | return -ENOSYS; | |
3aed4dca | 2497 | } |
8070f5c0 MD |
2498 | default: |
2499 | return -ENOIOCTLCMD; | |
2500 | } | |
2501 | } | |
2502 | ||
0a84a57f MD |
2503 | static |
2504 | int lttng_event_release(struct inode *inode, struct file *file) | |
2505 | { | |
3c997079 | 2506 | struct lttng_event *event; |
4442bc1b | 2507 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2508 | enum lttng_event_type *evtype = file->private_data; |
2509 | ||
2510 | if (!evtype) | |
2511 | return 0; | |
2512 | ||
2513 | switch (*evtype) { | |
2514 | case LTTNG_TYPE_EVENT: | |
2515 | event = file->private_data; | |
2516 | if (event) | |
2517 | fput(event->chan->file); | |
2518 | break; | |
2519 | case LTTNG_TYPE_ENABLER: | |
4442bc1b JR |
2520 | event_enabler = file->private_data; |
2521 | if (event_enabler) | |
2522 | fput(event_enabler->chan->file); | |
3c997079 MD |
2523 | break; |
2524 | default: | |
2525 | WARN_ON_ONCE(1); | |
2526 | break; | |
2527 | } | |
c269fff4 | 2528 | |
0a84a57f MD |
2529 | return 0; |
2530 | } | |
2531 | ||
3b923e5b | 2532 | /* TODO: filter control ioctl */ |
0a84a57f | 2533 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 2534 | .owner = THIS_MODULE, |
0a84a57f | 2535 | .release = lttng_event_release, |
8070f5c0 MD |
2536 | .unlocked_ioctl = lttng_event_ioctl, |
2537 | #ifdef CONFIG_COMPAT | |
2538 | .compat_ioctl = lttng_event_ioctl, | |
2539 | #endif | |
11b5a3c2 | 2540 | }; |
0a84a57f | 2541 | |
3b731ab1 JD |
2542 | static int put_u64(uint64_t val, unsigned long arg) |
2543 | { | |
2544 | return put_user(val, (uint64_t __user *) arg); | |
2545 | } | |
2546 | ||
8b97fd42 MD |
2547 | static int put_u32(uint32_t val, unsigned long arg) |
2548 | { | |
2549 | return put_user(val, (uint32_t __user *) arg); | |
2550 | } | |
2551 | ||
ed8d02d6 JD |
2552 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2553 | unsigned int cmd, unsigned long arg) | |
2554 | { | |
3b731ab1 JD |
2555 | struct lib_ring_buffer *buf = filp->private_data; |
2556 | struct channel *chan = buf->backend.chan; | |
2557 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2558 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2559 | int ret; |
2560 | ||
2561 | if (atomic_read(&chan->record_disabled)) | |
2562 | return -EIO; | |
2563 | ||
ed8d02d6 | 2564 | switch (cmd) { |
3b731ab1 JD |
2565 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
2566 | { | |
2567 | uint64_t ts; | |
2568 | ||
dd5a0db3 | 2569 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2570 | if (ret < 0) |
2571 | goto error; | |
2572 | return put_u64(ts, arg); | |
2573 | } | |
2574 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
2575 | { | |
2576 | uint64_t ts; | |
2577 | ||
dd5a0db3 | 2578 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2579 | if (ret < 0) |
2580 | goto error; | |
2581 | return put_u64(ts, arg); | |
2582 | } | |
2583 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
2584 | { | |
2585 | uint64_t ed; | |
2586 | ||
dd5a0db3 | 2587 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2588 | if (ret < 0) |
2589 | goto error; | |
2590 | return put_u64(ed, arg); | |
2591 | } | |
2592 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
2593 | { | |
2594 | uint64_t cs; | |
2595 | ||
dd5a0db3 | 2596 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2597 | if (ret < 0) |
2598 | goto error; | |
2599 | return put_u64(cs, arg); | |
2600 | } | |
2601 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
2602 | { | |
2603 | uint64_t ps; | |
2604 | ||
dd5a0db3 | 2605 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2606 | if (ret < 0) |
2607 | goto error; | |
2608 | return put_u64(ps, arg); | |
2609 | } | |
2610 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
2611 | { | |
2612 | uint64_t si; | |
2613 | ||
dd5a0db3 | 2614 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2615 | if (ret < 0) |
2616 | goto error; | |
2617 | return put_u64(si, arg); | |
2618 | } | |
2348ca17 JD |
2619 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2620 | { | |
2621 | uint64_t ts; | |
2622 | ||
dd5a0db3 | 2623 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2624 | if (ret < 0) |
2625 | goto error; | |
2626 | return put_u64(ts, arg); | |
2627 | } | |
5b3cf4f9 JD |
2628 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
2629 | { | |
2630 | uint64_t seq; | |
2631 | ||
2632 | ret = ops->sequence_number(config, buf, &seq); | |
2633 | if (ret < 0) | |
2634 | goto error; | |
2635 | return put_u64(seq, arg); | |
2636 | } | |
5594698f JD |
2637 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
2638 | { | |
2639 | uint64_t id; | |
2640 | ||
2641 | ret = ops->instance_id(config, buf, &id); | |
2642 | if (ret < 0) | |
2643 | goto error; | |
2644 | return put_u64(id, arg); | |
2645 | } | |
3b731ab1 JD |
2646 | default: |
2647 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2648 | cmd, arg); | |
ed8d02d6 | 2649 | } |
3b731ab1 JD |
2650 | |
2651 | error: | |
2652 | return -ENOSYS; | |
ed8d02d6 JD |
2653 | } |
2654 | ||
2655 | #ifdef CONFIG_COMPAT | |
2656 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2657 | unsigned int cmd, unsigned long arg) | |
2658 | { | |
3b731ab1 JD |
2659 | struct lib_ring_buffer *buf = filp->private_data; |
2660 | struct channel *chan = buf->backend.chan; | |
2661 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2662 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2663 | int ret; |
2664 | ||
2665 | if (atomic_read(&chan->record_disabled)) | |
2666 | return -EIO; | |
2667 | ||
ed8d02d6 | 2668 | switch (cmd) { |
3b731ab1 JD |
2669 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2670 | { | |
2671 | uint64_t ts; | |
2672 | ||
dd5a0db3 | 2673 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2674 | if (ret < 0) |
2675 | goto error; | |
2676 | return put_u64(ts, arg); | |
2677 | } | |
2678 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
2679 | { | |
2680 | uint64_t ts; | |
2681 | ||
dd5a0db3 | 2682 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2683 | if (ret < 0) |
2684 | goto error; | |
2685 | return put_u64(ts, arg); | |
2686 | } | |
2687 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
2688 | { | |
2689 | uint64_t ed; | |
2690 | ||
dd5a0db3 | 2691 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2692 | if (ret < 0) |
2693 | goto error; | |
2694 | return put_u64(ed, arg); | |
ed8d02d6 | 2695 | } |
3b731ab1 JD |
2696 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
2697 | { | |
2698 | uint64_t cs; | |
2699 | ||
dd5a0db3 | 2700 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2701 | if (ret < 0) |
2702 | goto error; | |
2703 | return put_u64(cs, arg); | |
2704 | } | |
2705 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
2706 | { | |
2707 | uint64_t ps; | |
2708 | ||
dd5a0db3 | 2709 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2710 | if (ret < 0) |
2711 | goto error; | |
2712 | return put_u64(ps, arg); | |
2713 | } | |
2714 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
2715 | { | |
2716 | uint64_t si; | |
2717 | ||
dd5a0db3 | 2718 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2719 | if (ret < 0) |
2720 | goto error; | |
2721 | return put_u64(si, arg); | |
2722 | } | |
2348ca17 JD |
2723 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2724 | { | |
2725 | uint64_t ts; | |
2726 | ||
dd5a0db3 | 2727 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2728 | if (ret < 0) |
2729 | goto error; | |
2730 | return put_u64(ts, arg); | |
2731 | } | |
5b3cf4f9 JD |
2732 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2733 | { | |
2734 | uint64_t seq; | |
2735 | ||
2736 | ret = ops->sequence_number(config, buf, &seq); | |
2737 | if (ret < 0) | |
2738 | goto error; | |
2739 | return put_u64(seq, arg); | |
2740 | } | |
5594698f JD |
2741 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2742 | { | |
2743 | uint64_t id; | |
2744 | ||
2745 | ret = ops->instance_id(config, buf, &id); | |
2746 | if (ret < 0) | |
2747 | goto error; | |
2748 | return put_u64(id, arg); | |
2749 | } | |
3b731ab1 JD |
2750 | default: |
2751 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2752 | cmd, arg); | |
2753 | } | |
2754 | ||
2755 | error: | |
2756 | return -ENOSYS; | |
ed8d02d6 JD |
2757 | } |
2758 | #endif /* CONFIG_COMPAT */ | |
2759 | ||
2760 | static void lttng_stream_override_ring_buffer_fops(void) | |
2761 | { | |
2762 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2763 | lttng_stream_ring_buffer_file_operations.open = | |
2764 | lib_ring_buffer_file_operations.open; | |
2765 | lttng_stream_ring_buffer_file_operations.release = | |
2766 | lib_ring_buffer_file_operations.release; | |
2767 | lttng_stream_ring_buffer_file_operations.poll = | |
2768 | lib_ring_buffer_file_operations.poll; | |
2769 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2770 | lib_ring_buffer_file_operations.splice_read; | |
2771 | lttng_stream_ring_buffer_file_operations.mmap = | |
2772 | lib_ring_buffer_file_operations.mmap; | |
2773 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2774 | lttng_stream_ring_buffer_ioctl; | |
2775 | lttng_stream_ring_buffer_file_operations.llseek = | |
2776 | lib_ring_buffer_file_operations.llseek; | |
2777 | #ifdef CONFIG_COMPAT | |
2778 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2779 | lttng_stream_ring_buffer_compat_ioctl; | |
2780 | #endif | |
2781 | } | |
2782 | ||
80996790 | 2783 | int __init lttng_abi_init(void) |
baf20995 MD |
2784 | { |
2785 | int ret = 0; | |
2786 | ||
263b6c88 | 2787 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2788 | lttng_clock_ref(); |
f771eda6 JD |
2789 | |
2790 | ret = lttng_tp_mempool_init(); | |
2791 | if (ret) { | |
2792 | goto error; | |
2793 | } | |
2794 | ||
d29348f7 | 2795 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2796 | <tng_proc_ops, NULL); |
2470a237 | 2797 | |
255e52a4 | 2798 | if (!lttng_proc_dentry) { |
5a15f70c | 2799 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
2800 | ret = -ENOMEM; |
2801 | goto error; | |
2802 | } | |
ed8d02d6 | 2803 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2804 | return 0; |
ed8d02d6 | 2805 | |
baf20995 | 2806 | error: |
f771eda6 | 2807 | lttng_tp_mempool_destroy(); |
2754583e | 2808 | lttng_clock_unref(); |
baf20995 MD |
2809 | return ret; |
2810 | } | |
2811 | ||
e6e65fcd MD |
2812 | /* No __exit annotation because used by init error path too. */ |
2813 | void lttng_abi_exit(void) | |
baf20995 | 2814 | { |
f771eda6 | 2815 | lttng_tp_mempool_destroy(); |
2754583e | 2816 | lttng_clock_unref(); |
e6a17f26 MD |
2817 | if (lttng_proc_dentry) |
2818 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2819 | } |