| 1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
| 2 | * |
| 3 | * lttng-abi.c |
| 4 | * |
| 5 | * LTTng ABI |
| 6 | * |
| 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 8 | * |
| 9 | * Mimic system calls for: |
| 10 | * - session creation, returns a file descriptor or failure. |
| 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. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/proc_fs.h> |
| 28 | #include <linux/anon_inodes.h> |
| 29 | #include <linux/file.h> |
| 30 | #include <linux/uaccess.h> |
| 31 | #include <linux/slab.h> |
| 32 | #include <linux/err.h> |
| 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ |
| 34 | #include <wrapper/ringbuffer/vfs.h> |
| 35 | #include <wrapper/ringbuffer/backend.h> |
| 36 | #include <wrapper/ringbuffer/frontend.h> |
| 37 | #include <wrapper/poll.h> |
| 38 | #include <wrapper/file.h> |
| 39 | #include <wrapper/kref.h> |
| 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> |
| 46 | #include <lib/ringbuffer/frontend_types.h> |
| 47 | |
| 48 | /* |
| 49 | * This is LTTng's own personal way to create a system call as an external |
| 50 | * module. We use ioctl() on /proc/lttng. |
| 51 | */ |
| 52 | |
| 53 | static struct proc_dir_entry *lttng_proc_dentry; |
| 54 | |
| 55 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
| 56 | static const struct proc_ops lttng_proc_ops; |
| 57 | #else |
| 58 | static const struct file_operations lttng_proc_ops; |
| 59 | #endif |
| 60 | |
| 61 | static const struct file_operations lttng_session_fops; |
| 62 | static const struct file_operations lttng_channel_fops; |
| 63 | static const struct file_operations lttng_metadata_fops; |
| 64 | static const struct file_operations lttng_event_fops; |
| 65 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
| 66 | |
| 67 | static int put_u64(uint64_t val, unsigned long arg); |
| 68 | |
| 69 | /* |
| 70 | * Teardown management: opened file descriptors keep a refcount on the module, |
| 71 | * so it can only exit when all file descriptors are closed. |
| 72 | */ |
| 73 | |
| 74 | static |
| 75 | int lttng_abi_create_session(void) |
| 76 | { |
| 77 | struct lttng_session *session; |
| 78 | struct file *session_file; |
| 79 | int session_fd, ret; |
| 80 | |
| 81 | session = lttng_session_create(); |
| 82 | if (!session) |
| 83 | return -ENOMEM; |
| 84 | session_fd = lttng_get_unused_fd(); |
| 85 | if (session_fd < 0) { |
| 86 | ret = session_fd; |
| 87 | goto fd_error; |
| 88 | } |
| 89 | session_file = anon_inode_getfile("[lttng_session]", |
| 90 | <tng_session_fops, |
| 91 | session, O_RDWR); |
| 92 | if (IS_ERR(session_file)) { |
| 93 | ret = PTR_ERR(session_file); |
| 94 | goto file_error; |
| 95 | } |
| 96 | session->file = session_file; |
| 97 | fd_install(session_fd, session_file); |
| 98 | return session_fd; |
| 99 | |
| 100 | file_error: |
| 101 | put_unused_fd(session_fd); |
| 102 | fd_error: |
| 103 | lttng_session_destroy(session); |
| 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | static |
| 108 | int lttng_abi_tracepoint_list(void) |
| 109 | { |
| 110 | struct file *tracepoint_list_file; |
| 111 | int file_fd, ret; |
| 112 | |
| 113 | file_fd = lttng_get_unused_fd(); |
| 114 | if (file_fd < 0) { |
| 115 | ret = file_fd; |
| 116 | goto fd_error; |
| 117 | } |
| 118 | |
| 119 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
| 120 | <tng_tracepoint_list_fops, |
| 121 | NULL, O_RDWR); |
| 122 | if (IS_ERR(tracepoint_list_file)) { |
| 123 | ret = PTR_ERR(tracepoint_list_file); |
| 124 | goto file_error; |
| 125 | } |
| 126 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
| 127 | if (ret < 0) |
| 128 | goto open_error; |
| 129 | fd_install(file_fd, tracepoint_list_file); |
| 130 | return file_fd; |
| 131 | |
| 132 | open_error: |
| 133 | fput(tracepoint_list_file); |
| 134 | file_error: |
| 135 | put_unused_fd(file_fd); |
| 136 | fd_error: |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 140 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
| 141 | static inline |
| 142 | int lttng_abi_syscall_list(void) |
| 143 | { |
| 144 | return -ENOSYS; |
| 145 | } |
| 146 | #else |
| 147 | static |
| 148 | int lttng_abi_syscall_list(void) |
| 149 | { |
| 150 | struct file *syscall_list_file; |
| 151 | int file_fd, ret; |
| 152 | |
| 153 | file_fd = lttng_get_unused_fd(); |
| 154 | if (file_fd < 0) { |
| 155 | ret = file_fd; |
| 156 | goto fd_error; |
| 157 | } |
| 158 | |
| 159 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", |
| 160 | <tng_syscall_list_fops, |
| 161 | NULL, O_RDWR); |
| 162 | if (IS_ERR(syscall_list_file)) { |
| 163 | ret = PTR_ERR(syscall_list_file); |
| 164 | goto file_error; |
| 165 | } |
| 166 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); |
| 167 | if (ret < 0) |
| 168 | goto open_error; |
| 169 | fd_install(file_fd, syscall_list_file); |
| 170 | return file_fd; |
| 171 | |
| 172 | open_error: |
| 173 | fput(syscall_list_file); |
| 174 | file_error: |
| 175 | put_unused_fd(file_fd); |
| 176 | fd_error: |
| 177 | return ret; |
| 178 | } |
| 179 | #endif |
| 180 | |
| 181 | static |
| 182 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
| 183 | { |
| 184 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
| 185 | v->minor = LTTNG_MODULES_MINOR_VERSION; |
| 186 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; |
| 187 | } |
| 188 | |
| 189 | static |
| 190 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) |
| 191 | { |
| 192 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; |
| 193 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; |
| 194 | } |
| 195 | |
| 196 | static |
| 197 | long lttng_abi_add_context(struct file *file, |
| 198 | struct lttng_kernel_context *context_param, |
| 199 | struct lttng_ctx **ctx, struct lttng_session *session) |
| 200 | { |
| 201 | |
| 202 | if (session->been_active) |
| 203 | return -EPERM; |
| 204 | |
| 205 | switch (context_param->ctx) { |
| 206 | case LTTNG_KERNEL_CONTEXT_PID: |
| 207 | return lttng_add_pid_to_ctx(ctx); |
| 208 | case LTTNG_KERNEL_CONTEXT_PRIO: |
| 209 | return lttng_add_prio_to_ctx(ctx); |
| 210 | case LTTNG_KERNEL_CONTEXT_NICE: |
| 211 | return lttng_add_nice_to_ctx(ctx); |
| 212 | case LTTNG_KERNEL_CONTEXT_VPID: |
| 213 | return lttng_add_vpid_to_ctx(ctx); |
| 214 | case LTTNG_KERNEL_CONTEXT_TID: |
| 215 | return lttng_add_tid_to_ctx(ctx); |
| 216 | case LTTNG_KERNEL_CONTEXT_VTID: |
| 217 | return lttng_add_vtid_to_ctx(ctx); |
| 218 | case LTTNG_KERNEL_CONTEXT_PPID: |
| 219 | return lttng_add_ppid_to_ctx(ctx); |
| 220 | case LTTNG_KERNEL_CONTEXT_VPPID: |
| 221 | return lttng_add_vppid_to_ctx(ctx); |
| 222 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
| 223 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 224 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, |
| 225 | context_param->u.perf_counter.config, |
| 226 | context_param->u.perf_counter.name, |
| 227 | ctx); |
| 228 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
| 229 | return lttng_add_procname_to_ctx(ctx); |
| 230 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
| 231 | return lttng_add_hostname_to_ctx(ctx); |
| 232 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
| 233 | return lttng_add_cpu_id_to_ctx(ctx); |
| 234 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
| 235 | return lttng_add_interruptible_to_ctx(ctx); |
| 236 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: |
| 237 | return lttng_add_need_reschedule_to_ctx(ctx); |
| 238 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: |
| 239 | return lttng_add_preemptible_to_ctx(ctx); |
| 240 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: |
| 241 | return lttng_add_migratable_to_ctx(ctx); |
| 242 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
| 243 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: |
| 244 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); |
| 245 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
| 246 | return lttng_add_cgroup_ns_to_ctx(ctx); |
| 247 | case LTTNG_KERNEL_CONTEXT_IPC_NS: |
| 248 | return lttng_add_ipc_ns_to_ctx(ctx); |
| 249 | case LTTNG_KERNEL_CONTEXT_MNT_NS: |
| 250 | return lttng_add_mnt_ns_to_ctx(ctx); |
| 251 | case LTTNG_KERNEL_CONTEXT_NET_NS: |
| 252 | return lttng_add_net_ns_to_ctx(ctx); |
| 253 | case LTTNG_KERNEL_CONTEXT_PID_NS: |
| 254 | return lttng_add_pid_ns_to_ctx(ctx); |
| 255 | case LTTNG_KERNEL_CONTEXT_USER_NS: |
| 256 | return lttng_add_user_ns_to_ctx(ctx); |
| 257 | case LTTNG_KERNEL_CONTEXT_UTS_NS: |
| 258 | return lttng_add_uts_ns_to_ctx(ctx); |
| 259 | case LTTNG_KERNEL_CONTEXT_UID: |
| 260 | return lttng_add_uid_to_ctx(ctx); |
| 261 | case LTTNG_KERNEL_CONTEXT_EUID: |
| 262 | return lttng_add_euid_to_ctx(ctx); |
| 263 | case LTTNG_KERNEL_CONTEXT_SUID: |
| 264 | return lttng_add_suid_to_ctx(ctx); |
| 265 | case LTTNG_KERNEL_CONTEXT_GID: |
| 266 | return lttng_add_gid_to_ctx(ctx); |
| 267 | case LTTNG_KERNEL_CONTEXT_EGID: |
| 268 | return lttng_add_egid_to_ctx(ctx); |
| 269 | case LTTNG_KERNEL_CONTEXT_SGID: |
| 270 | return lttng_add_sgid_to_ctx(ctx); |
| 271 | case LTTNG_KERNEL_CONTEXT_VUID: |
| 272 | return lttng_add_vuid_to_ctx(ctx); |
| 273 | case LTTNG_KERNEL_CONTEXT_VEUID: |
| 274 | return lttng_add_veuid_to_ctx(ctx); |
| 275 | case LTTNG_KERNEL_CONTEXT_VSUID: |
| 276 | return lttng_add_vsuid_to_ctx(ctx); |
| 277 | case LTTNG_KERNEL_CONTEXT_VGID: |
| 278 | return lttng_add_vgid_to_ctx(ctx); |
| 279 | case LTTNG_KERNEL_CONTEXT_VEGID: |
| 280 | return lttng_add_vegid_to_ctx(ctx); |
| 281 | case LTTNG_KERNEL_CONTEXT_VSGID: |
| 282 | return lttng_add_vsgid_to_ctx(ctx); |
| 283 | default: |
| 284 | return -EINVAL; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | /** |
| 289 | * lttng_ioctl - lttng syscall through ioctl |
| 290 | * |
| 291 | * @file: the file |
| 292 | * @cmd: the command |
| 293 | * @arg: command arg |
| 294 | * |
| 295 | * This ioctl implements lttng commands: |
| 296 | * LTTNG_KERNEL_SESSION |
| 297 | * Returns a LTTng trace session file descriptor |
| 298 | * LTTNG_KERNEL_TRACER_VERSION |
| 299 | * Returns the LTTng kernel tracer version |
| 300 | * LTTNG_KERNEL_TRACEPOINT_LIST |
| 301 | * Returns a file descriptor listing available tracepoints |
| 302 | * LTTNG_KERNEL_WAIT_QUIESCENT |
| 303 | * Returns after all previously running probes have completed |
| 304 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
| 305 | * Returns the LTTng kernel tracer ABI version |
| 306 | * |
| 307 | * The returned session will be deleted when its file descriptor is closed. |
| 308 | */ |
| 309 | static |
| 310 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 311 | { |
| 312 | switch (cmd) { |
| 313 | case LTTNG_KERNEL_OLD_SESSION: |
| 314 | case LTTNG_KERNEL_SESSION: |
| 315 | return lttng_abi_create_session(); |
| 316 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
| 317 | { |
| 318 | struct lttng_kernel_tracer_version v; |
| 319 | struct lttng_kernel_old_tracer_version oldv; |
| 320 | struct lttng_kernel_old_tracer_version *uversion = |
| 321 | (struct lttng_kernel_old_tracer_version __user *) arg; |
| 322 | |
| 323 | lttng_abi_tracer_version(&v); |
| 324 | oldv.major = v.major; |
| 325 | oldv.minor = v.minor; |
| 326 | oldv.patchlevel = v.patchlevel; |
| 327 | |
| 328 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) |
| 329 | return -EFAULT; |
| 330 | return 0; |
| 331 | } |
| 332 | case LTTNG_KERNEL_TRACER_VERSION: |
| 333 | { |
| 334 | struct lttng_kernel_tracer_version version; |
| 335 | struct lttng_kernel_tracer_version *uversion = |
| 336 | (struct lttng_kernel_tracer_version __user *) arg; |
| 337 | |
| 338 | lttng_abi_tracer_version(&version); |
| 339 | |
| 340 | if (copy_to_user(uversion, &version, sizeof(version))) |
| 341 | return -EFAULT; |
| 342 | return 0; |
| 343 | } |
| 344 | case LTTNG_KERNEL_TRACER_ABI_VERSION: |
| 345 | { |
| 346 | struct lttng_kernel_tracer_abi_version version; |
| 347 | struct lttng_kernel_tracer_abi_version *uversion = |
| 348 | (struct lttng_kernel_tracer_abi_version __user *) arg; |
| 349 | |
| 350 | lttng_abi_tracer_abi_version(&version); |
| 351 | |
| 352 | if (copy_to_user(uversion, &version, sizeof(version))) |
| 353 | return -EFAULT; |
| 354 | return 0; |
| 355 | } |
| 356 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: |
| 357 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
| 358 | return lttng_abi_tracepoint_list(); |
| 359 | case LTTNG_KERNEL_SYSCALL_LIST: |
| 360 | return lttng_abi_syscall_list(); |
| 361 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
| 362 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
| 363 | synchronize_trace(); |
| 364 | return 0; |
| 365 | case LTTNG_KERNEL_OLD_CALIBRATE: |
| 366 | { |
| 367 | struct lttng_kernel_old_calibrate __user *ucalibrate = |
| 368 | (struct lttng_kernel_old_calibrate __user *) arg; |
| 369 | struct lttng_kernel_old_calibrate old_calibrate; |
| 370 | struct lttng_kernel_calibrate calibrate; |
| 371 | int ret; |
| 372 | |
| 373 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) |
| 374 | return -EFAULT; |
| 375 | calibrate.type = old_calibrate.type; |
| 376 | ret = lttng_calibrate(&calibrate); |
| 377 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) |
| 378 | return -EFAULT; |
| 379 | return ret; |
| 380 | } |
| 381 | case LTTNG_KERNEL_CALIBRATE: |
| 382 | { |
| 383 | struct lttng_kernel_calibrate __user *ucalibrate = |
| 384 | (struct lttng_kernel_calibrate __user *) arg; |
| 385 | struct lttng_kernel_calibrate calibrate; |
| 386 | int ret; |
| 387 | |
| 388 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) |
| 389 | return -EFAULT; |
| 390 | ret = lttng_calibrate(&calibrate); |
| 391 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) |
| 392 | return -EFAULT; |
| 393 | return ret; |
| 394 | } |
| 395 | default: |
| 396 | return -ENOIOCTLCMD; |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
| 401 | static const struct proc_ops lttng_proc_ops = { |
| 402 | .proc_ioctl = lttng_ioctl, |
| 403 | #ifdef CONFIG_COMPAT |
| 404 | .proc_compat_ioctl = lttng_ioctl, |
| 405 | #endif /* CONFIG_COMPAT */ |
| 406 | }; |
| 407 | #else |
| 408 | static const struct file_operations lttng_proc_ops = { |
| 409 | .owner = THIS_MODULE, |
| 410 | .unlocked_ioctl = lttng_ioctl, |
| 411 | #ifdef CONFIG_COMPAT |
| 412 | .compat_ioctl = lttng_ioctl, |
| 413 | #endif /* CONFIG_COMPAT */ |
| 414 | }; |
| 415 | #endif |
| 416 | |
| 417 | static |
| 418 | int lttng_abi_create_channel(struct file *session_file, |
| 419 | struct lttng_kernel_channel *chan_param, |
| 420 | enum channel_type channel_type) |
| 421 | { |
| 422 | struct lttng_session *session = session_file->private_data; |
| 423 | const struct file_operations *fops = NULL; |
| 424 | const char *transport_name; |
| 425 | struct lttng_channel *chan; |
| 426 | struct file *chan_file; |
| 427 | int chan_fd; |
| 428 | int ret = 0; |
| 429 | |
| 430 | chan_fd = lttng_get_unused_fd(); |
| 431 | if (chan_fd < 0) { |
| 432 | ret = chan_fd; |
| 433 | goto fd_error; |
| 434 | } |
| 435 | switch (channel_type) { |
| 436 | case PER_CPU_CHANNEL: |
| 437 | fops = <tng_channel_fops; |
| 438 | break; |
| 439 | case METADATA_CHANNEL: |
| 440 | fops = <tng_metadata_fops; |
| 441 | break; |
| 442 | } |
| 443 | |
| 444 | chan_file = anon_inode_getfile("[lttng_channel]", |
| 445 | fops, |
| 446 | NULL, O_RDWR); |
| 447 | if (IS_ERR(chan_file)) { |
| 448 | ret = PTR_ERR(chan_file); |
| 449 | goto file_error; |
| 450 | } |
| 451 | switch (channel_type) { |
| 452 | case PER_CPU_CHANNEL: |
| 453 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
| 454 | transport_name = chan_param->overwrite ? |
| 455 | "relay-overwrite" : "relay-discard"; |
| 456 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
| 457 | transport_name = chan_param->overwrite ? |
| 458 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
| 459 | } else { |
| 460 | return -EINVAL; |
| 461 | } |
| 462 | break; |
| 463 | case METADATA_CHANNEL: |
| 464 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
| 465 | transport_name = "relay-metadata"; |
| 466 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
| 467 | transport_name = "relay-metadata-mmap"; |
| 468 | else |
| 469 | return -EINVAL; |
| 470 | break; |
| 471 | default: |
| 472 | transport_name = "<unknown>"; |
| 473 | break; |
| 474 | } |
| 475 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
| 476 | ret = -EOVERFLOW; |
| 477 | goto refcount_error; |
| 478 | } |
| 479 | /* |
| 480 | * We tolerate no failure path after channel creation. It will stay |
| 481 | * invariant for the rest of the session. |
| 482 | */ |
| 483 | chan = lttng_channel_create(session, transport_name, NULL, |
| 484 | chan_param->subbuf_size, |
| 485 | chan_param->num_subbuf, |
| 486 | chan_param->switch_timer_interval, |
| 487 | chan_param->read_timer_interval, |
| 488 | channel_type); |
| 489 | if (!chan) { |
| 490 | ret = -EINVAL; |
| 491 | goto chan_error; |
| 492 | } |
| 493 | chan->file = chan_file; |
| 494 | chan_file->private_data = chan; |
| 495 | fd_install(chan_fd, chan_file); |
| 496 | |
| 497 | return chan_fd; |
| 498 | |
| 499 | chan_error: |
| 500 | atomic_long_dec(&session_file->f_count); |
| 501 | refcount_error: |
| 502 | fput(chan_file); |
| 503 | file_error: |
| 504 | put_unused_fd(chan_fd); |
| 505 | fd_error: |
| 506 | return ret; |
| 507 | } |
| 508 | |
| 509 | static |
| 510 | int lttng_abi_session_set_name(struct lttng_session *session, |
| 511 | struct lttng_kernel_session_name *name) |
| 512 | { |
| 513 | size_t len; |
| 514 | |
| 515 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); |
| 516 | |
| 517 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { |
| 518 | /* Name is too long/malformed */ |
| 519 | return -EINVAL; |
| 520 | } |
| 521 | |
| 522 | strcpy(session->name, name->name); |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | static |
| 527 | int lttng_abi_session_set_creation_time(struct lttng_session *session, |
| 528 | struct lttng_kernel_session_creation_time *time) |
| 529 | { |
| 530 | size_t len; |
| 531 | |
| 532 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); |
| 533 | |
| 534 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { |
| 535 | /* Time is too long/malformed */ |
| 536 | return -EINVAL; |
| 537 | } |
| 538 | |
| 539 | strcpy(session->creation_time, time->iso8601); |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | static |
| 544 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) |
| 545 | { |
| 546 | switch (tracker->type) { |
| 547 | case LTTNG_KERNEL_TRACKER_PID: |
| 548 | return TRACKER_PID; |
| 549 | case LTTNG_KERNEL_TRACKER_VPID: |
| 550 | return TRACKER_VPID; |
| 551 | case LTTNG_KERNEL_TRACKER_UID: |
| 552 | return TRACKER_UID; |
| 553 | case LTTNG_KERNEL_TRACKER_VUID: |
| 554 | return TRACKER_VUID; |
| 555 | case LTTNG_KERNEL_TRACKER_GID: |
| 556 | return TRACKER_GID; |
| 557 | case LTTNG_KERNEL_TRACKER_VGID: |
| 558 | return TRACKER_VGID; |
| 559 | default: |
| 560 | return TRACKER_UNKNOWN; |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * lttng_session_ioctl - lttng session fd ioctl |
| 566 | * |
| 567 | * @file: the file |
| 568 | * @cmd: the command |
| 569 | * @arg: command arg |
| 570 | * |
| 571 | * This ioctl implements lttng commands: |
| 572 | * LTTNG_KERNEL_CHANNEL |
| 573 | * Returns a LTTng channel file descriptor |
| 574 | * LTTNG_KERNEL_ENABLE |
| 575 | * Enables tracing for a session (weak enable) |
| 576 | * LTTNG_KERNEL_DISABLE |
| 577 | * Disables tracing for a session (strong disable) |
| 578 | * LTTNG_KERNEL_METADATA |
| 579 | * Returns a LTTng metadata file descriptor |
| 580 | * LTTNG_KERNEL_SESSION_TRACK_PID |
| 581 | * Add PID to session PID tracker |
| 582 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
| 583 | * Remove PID from session PID tracker |
| 584 | * LTTNG_KERNEL_SESSION_TRACK_ID |
| 585 | * Add ID to tracker |
| 586 | * LTTNG_KERNEL_SESSION_UNTRACK_ID |
| 587 | * Remove ID from tracker |
| 588 | * |
| 589 | * The returned channel will be deleted when its file descriptor is closed. |
| 590 | */ |
| 591 | static |
| 592 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 593 | { |
| 594 | struct lttng_session *session = file->private_data; |
| 595 | struct lttng_kernel_channel chan_param; |
| 596 | struct lttng_kernel_old_channel old_chan_param; |
| 597 | |
| 598 | switch (cmd) { |
| 599 | case LTTNG_KERNEL_OLD_CHANNEL: |
| 600 | { |
| 601 | if (copy_from_user(&old_chan_param, |
| 602 | (struct lttng_kernel_old_channel __user *) arg, |
| 603 | sizeof(struct lttng_kernel_old_channel))) |
| 604 | return -EFAULT; |
| 605 | chan_param.overwrite = old_chan_param.overwrite; |
| 606 | chan_param.subbuf_size = old_chan_param.subbuf_size; |
| 607 | chan_param.num_subbuf = old_chan_param.num_subbuf; |
| 608 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; |
| 609 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; |
| 610 | chan_param.output = old_chan_param.output; |
| 611 | |
| 612 | return lttng_abi_create_channel(file, &chan_param, |
| 613 | PER_CPU_CHANNEL); |
| 614 | } |
| 615 | case LTTNG_KERNEL_CHANNEL: |
| 616 | { |
| 617 | if (copy_from_user(&chan_param, |
| 618 | (struct lttng_kernel_channel __user *) arg, |
| 619 | sizeof(struct lttng_kernel_channel))) |
| 620 | return -EFAULT; |
| 621 | return lttng_abi_create_channel(file, &chan_param, |
| 622 | PER_CPU_CHANNEL); |
| 623 | } |
| 624 | case LTTNG_KERNEL_OLD_SESSION_START: |
| 625 | case LTTNG_KERNEL_OLD_ENABLE: |
| 626 | case LTTNG_KERNEL_SESSION_START: |
| 627 | case LTTNG_KERNEL_ENABLE: |
| 628 | return lttng_session_enable(session); |
| 629 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
| 630 | case LTTNG_KERNEL_OLD_DISABLE: |
| 631 | case LTTNG_KERNEL_SESSION_STOP: |
| 632 | case LTTNG_KERNEL_DISABLE: |
| 633 | return lttng_session_disable(session); |
| 634 | case LTTNG_KERNEL_OLD_METADATA: |
| 635 | { |
| 636 | if (copy_from_user(&old_chan_param, |
| 637 | (struct lttng_kernel_old_channel __user *) arg, |
| 638 | sizeof(struct lttng_kernel_old_channel))) |
| 639 | return -EFAULT; |
| 640 | chan_param.overwrite = old_chan_param.overwrite; |
| 641 | chan_param.subbuf_size = old_chan_param.subbuf_size; |
| 642 | chan_param.num_subbuf = old_chan_param.num_subbuf; |
| 643 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; |
| 644 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; |
| 645 | chan_param.output = old_chan_param.output; |
| 646 | |
| 647 | return lttng_abi_create_channel(file, &chan_param, |
| 648 | METADATA_CHANNEL); |
| 649 | } |
| 650 | case LTTNG_KERNEL_METADATA: |
| 651 | { |
| 652 | if (copy_from_user(&chan_param, |
| 653 | (struct lttng_kernel_channel __user *) arg, |
| 654 | sizeof(struct lttng_kernel_channel))) |
| 655 | return -EFAULT; |
| 656 | return lttng_abi_create_channel(file, &chan_param, |
| 657 | METADATA_CHANNEL); |
| 658 | } |
| 659 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
| 660 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
| 661 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
| 662 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
| 663 | case LTTNG_KERNEL_SESSION_TRACK_ID: |
| 664 | { |
| 665 | struct lttng_kernel_tracker_args tracker; |
| 666 | enum tracker_type tracker_type; |
| 667 | |
| 668 | if (copy_from_user(&tracker, |
| 669 | (struct lttng_kernel_tracker_args __user *) arg, |
| 670 | sizeof(struct lttng_kernel_tracker_args))) |
| 671 | return -EFAULT; |
| 672 | tracker_type = get_tracker_type(&tracker); |
| 673 | if (tracker_type == TRACKER_UNKNOWN) |
| 674 | return -EINVAL; |
| 675 | return lttng_session_track_id(session, tracker_type, tracker.id); |
| 676 | } |
| 677 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: |
| 678 | { |
| 679 | struct lttng_kernel_tracker_args tracker; |
| 680 | enum tracker_type tracker_type; |
| 681 | |
| 682 | if (copy_from_user(&tracker, |
| 683 | (struct lttng_kernel_tracker_args __user *) arg, |
| 684 | sizeof(struct lttng_kernel_tracker_args))) |
| 685 | return -EFAULT; |
| 686 | tracker_type = get_tracker_type(&tracker); |
| 687 | if (tracker_type == TRACKER_UNKNOWN) |
| 688 | return -EINVAL; |
| 689 | return lttng_session_untrack_id(session, tracker_type, |
| 690 | tracker.id); |
| 691 | } |
| 692 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
| 693 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
| 694 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: |
| 695 | { |
| 696 | struct lttng_kernel_tracker_args tracker; |
| 697 | enum tracker_type tracker_type; |
| 698 | |
| 699 | if (copy_from_user(&tracker, |
| 700 | (struct lttng_kernel_tracker_args __user *) arg, |
| 701 | sizeof(struct lttng_kernel_tracker_args))) |
| 702 | return -EFAULT; |
| 703 | tracker_type = get_tracker_type(&tracker); |
| 704 | if (tracker_type == TRACKER_UNKNOWN) |
| 705 | return -EINVAL; |
| 706 | return lttng_session_list_tracker_ids(session, tracker_type); |
| 707 | } |
| 708 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
| 709 | return lttng_session_metadata_regenerate(session); |
| 710 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
| 711 | return lttng_session_statedump(session); |
| 712 | case LTTNG_KERNEL_SESSION_SET_NAME: |
| 713 | { |
| 714 | struct lttng_kernel_session_name name; |
| 715 | |
| 716 | if (copy_from_user(&name, |
| 717 | (struct lttng_kernel_session_name __user *) arg, |
| 718 | sizeof(struct lttng_kernel_session_name))) |
| 719 | return -EFAULT; |
| 720 | return lttng_abi_session_set_name(session, &name); |
| 721 | } |
| 722 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
| 723 | { |
| 724 | struct lttng_kernel_session_creation_time time; |
| 725 | |
| 726 | if (copy_from_user(&time, |
| 727 | (struct lttng_kernel_session_creation_time __user *) arg, |
| 728 | sizeof(struct lttng_kernel_session_creation_time))) |
| 729 | return -EFAULT; |
| 730 | return lttng_abi_session_set_creation_time(session, &time); |
| 731 | } |
| 732 | default: |
| 733 | return -ENOIOCTLCMD; |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Called when the last file reference is dropped. |
| 739 | * |
| 740 | * Big fat note: channels and events are invariant for the whole session after |
| 741 | * their creation. So this session destruction also destroys all channel and |
| 742 | * event structures specific to this session (they are not destroyed when their |
| 743 | * individual file is released). |
| 744 | */ |
| 745 | static |
| 746 | int lttng_session_release(struct inode *inode, struct file *file) |
| 747 | { |
| 748 | struct lttng_session *session = file->private_data; |
| 749 | |
| 750 | if (session) |
| 751 | lttng_session_destroy(session); |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | static const struct file_operations lttng_session_fops = { |
| 756 | .owner = THIS_MODULE, |
| 757 | .release = lttng_session_release, |
| 758 | .unlocked_ioctl = lttng_session_ioctl, |
| 759 | #ifdef CONFIG_COMPAT |
| 760 | .compat_ioctl = lttng_session_ioctl, |
| 761 | #endif |
| 762 | }; |
| 763 | |
| 764 | /** |
| 765 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation |
| 766 | * @filp: the file |
| 767 | * @wait: poll table |
| 768 | * |
| 769 | * Handles the poll operations for the metadata channels. |
| 770 | */ |
| 771 | static |
| 772 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
| 773 | poll_table *wait) |
| 774 | { |
| 775 | struct lttng_metadata_stream *stream = filp->private_data; |
| 776 | struct lib_ring_buffer *buf = stream->priv; |
| 777 | int finalized; |
| 778 | unsigned int mask = 0; |
| 779 | |
| 780 | if (filp->f_mode & FMODE_READ) { |
| 781 | poll_wait_set_exclusive(wait); |
| 782 | poll_wait(filp, &stream->read_wait, wait); |
| 783 | |
| 784 | finalized = stream->finalized; |
| 785 | |
| 786 | /* |
| 787 | * lib_ring_buffer_is_finalized() contains a smp_rmb() |
| 788 | * ordering finalized load before offsets loads. |
| 789 | */ |
| 790 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); |
| 791 | |
| 792 | if (finalized) |
| 793 | mask |= POLLHUP; |
| 794 | |
| 795 | mutex_lock(&stream->metadata_cache->lock); |
| 796 | if (stream->metadata_cache->metadata_written > |
| 797 | stream->metadata_out) |
| 798 | mask |= POLLIN; |
| 799 | mutex_unlock(&stream->metadata_cache->lock); |
| 800 | } |
| 801 | |
| 802 | return mask; |
| 803 | } |
| 804 | |
| 805 | static |
| 806 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, |
| 807 | unsigned int cmd, unsigned long arg) |
| 808 | { |
| 809 | struct lttng_metadata_stream *stream = filp->private_data; |
| 810 | |
| 811 | stream->metadata_out = stream->metadata_in; |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * Reset the counter of how much metadata has been consumed to 0. That way, |
| 816 | * the consumer receives the content of the metadata cache unchanged. This is |
| 817 | * different from the metadata_regenerate where the offset from epoch is |
| 818 | * resampled, here we want the exact same content as the last time the metadata |
| 819 | * was generated. This command is only possible if all the metadata written |
| 820 | * in the cache has been output to the metadata stream to avoid corrupting the |
| 821 | * metadata file. |
| 822 | * |
| 823 | * Return 0 on success, a negative value on error. |
| 824 | */ |
| 825 | static |
| 826 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) |
| 827 | { |
| 828 | int ret; |
| 829 | struct lttng_metadata_cache *cache = stream->metadata_cache; |
| 830 | |
| 831 | mutex_lock(&cache->lock); |
| 832 | if (stream->metadata_out != cache->metadata_written) { |
| 833 | ret = -EBUSY; |
| 834 | goto end; |
| 835 | } |
| 836 | stream->metadata_out = 0; |
| 837 | stream->metadata_in = 0; |
| 838 | wake_up_interruptible(&stream->read_wait); |
| 839 | ret = 0; |
| 840 | |
| 841 | end: |
| 842 | mutex_unlock(&cache->lock); |
| 843 | return ret; |
| 844 | } |
| 845 | |
| 846 | static |
| 847 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, |
| 848 | unsigned int cmd, unsigned long arg) |
| 849 | { |
| 850 | int ret; |
| 851 | struct lttng_metadata_stream *stream = filp->private_data; |
| 852 | struct lib_ring_buffer *buf = stream->priv; |
| 853 | |
| 854 | switch (cmd) { |
| 855 | case RING_BUFFER_GET_NEXT_SUBBUF: |
| 856 | { |
| 857 | struct lttng_metadata_stream *stream = filp->private_data; |
| 858 | struct lib_ring_buffer *buf = stream->priv; |
| 859 | struct channel *chan = buf->backend.chan; |
| 860 | |
| 861 | ret = lttng_metadata_output_channel(stream, chan); |
| 862 | if (ret > 0) { |
| 863 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); |
| 864 | ret = 0; |
| 865 | } else if (ret < 0) |
| 866 | goto err; |
| 867 | break; |
| 868 | } |
| 869 | case RING_BUFFER_GET_SUBBUF: |
| 870 | { |
| 871 | /* |
| 872 | * Random access is not allowed for metadata channel. |
| 873 | */ |
| 874 | return -ENOSYS; |
| 875 | } |
| 876 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
| 877 | case RING_BUFFER_FLUSH: |
| 878 | { |
| 879 | struct lttng_metadata_stream *stream = filp->private_data; |
| 880 | struct lib_ring_buffer *buf = stream->priv; |
| 881 | struct channel *chan = buf->backend.chan; |
| 882 | |
| 883 | /* |
| 884 | * Before doing the actual ring buffer flush, write up to one |
| 885 | * packet of metadata in the ring buffer. |
| 886 | */ |
| 887 | ret = lttng_metadata_output_channel(stream, chan); |
| 888 | if (ret < 0) |
| 889 | goto err; |
| 890 | break; |
| 891 | } |
| 892 | case RING_BUFFER_GET_METADATA_VERSION: |
| 893 | { |
| 894 | struct lttng_metadata_stream *stream = filp->private_data; |
| 895 | |
| 896 | return put_u64(stream->version, arg); |
| 897 | } |
| 898 | case RING_BUFFER_METADATA_CACHE_DUMP: |
| 899 | { |
| 900 | struct lttng_metadata_stream *stream = filp->private_data; |
| 901 | |
| 902 | return lttng_metadata_cache_dump(stream); |
| 903 | } |
| 904 | default: |
| 905 | break; |
| 906 | } |
| 907 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
| 908 | |
| 909 | /* Performing lib ring buffer ioctl after our own. */ |
| 910 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
| 911 | if (ret < 0) |
| 912 | goto err; |
| 913 | |
| 914 | switch (cmd) { |
| 915 | case RING_BUFFER_PUT_NEXT_SUBBUF: |
| 916 | { |
| 917 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, |
| 918 | cmd, arg); |
| 919 | break; |
| 920 | } |
| 921 | default: |
| 922 | break; |
| 923 | } |
| 924 | err: |
| 925 | return ret; |
| 926 | } |
| 927 | |
| 928 | #ifdef CONFIG_COMPAT |
| 929 | static |
| 930 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, |
| 931 | unsigned int cmd, unsigned long arg) |
| 932 | { |
| 933 | int ret; |
| 934 | struct lttng_metadata_stream *stream = filp->private_data; |
| 935 | struct lib_ring_buffer *buf = stream->priv; |
| 936 | |
| 937 | switch (cmd) { |
| 938 | case RING_BUFFER_GET_NEXT_SUBBUF: |
| 939 | { |
| 940 | struct lttng_metadata_stream *stream = filp->private_data; |
| 941 | struct lib_ring_buffer *buf = stream->priv; |
| 942 | struct channel *chan = buf->backend.chan; |
| 943 | |
| 944 | ret = lttng_metadata_output_channel(stream, chan); |
| 945 | if (ret > 0) { |
| 946 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); |
| 947 | ret = 0; |
| 948 | } else if (ret < 0) |
| 949 | goto err; |
| 950 | break; |
| 951 | } |
| 952 | case RING_BUFFER_GET_SUBBUF: |
| 953 | { |
| 954 | /* |
| 955 | * Random access is not allowed for metadata channel. |
| 956 | */ |
| 957 | return -ENOSYS; |
| 958 | } |
| 959 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
| 960 | case RING_BUFFER_FLUSH: |
| 961 | { |
| 962 | struct lttng_metadata_stream *stream = filp->private_data; |
| 963 | struct lib_ring_buffer *buf = stream->priv; |
| 964 | struct channel *chan = buf->backend.chan; |
| 965 | |
| 966 | /* |
| 967 | * Before doing the actual ring buffer flush, write up to one |
| 968 | * packet of metadata in the ring buffer. |
| 969 | */ |
| 970 | ret = lttng_metadata_output_channel(stream, chan); |
| 971 | if (ret < 0) |
| 972 | goto err; |
| 973 | break; |
| 974 | } |
| 975 | case RING_BUFFER_GET_METADATA_VERSION: |
| 976 | { |
| 977 | struct lttng_metadata_stream *stream = filp->private_data; |
| 978 | |
| 979 | return put_u64(stream->version, arg); |
| 980 | } |
| 981 | case RING_BUFFER_METADATA_CACHE_DUMP: |
| 982 | { |
| 983 | struct lttng_metadata_stream *stream = filp->private_data; |
| 984 | |
| 985 | return lttng_metadata_cache_dump(stream); |
| 986 | } |
| 987 | default: |
| 988 | break; |
| 989 | } |
| 990 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
| 991 | |
| 992 | /* Performing lib ring buffer ioctl after our own. */ |
| 993 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
| 994 | if (ret < 0) |
| 995 | goto err; |
| 996 | |
| 997 | switch (cmd) { |
| 998 | case RING_BUFFER_PUT_NEXT_SUBBUF: |
| 999 | { |
| 1000 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, |
| 1001 | cmd, arg); |
| 1002 | break; |
| 1003 | } |
| 1004 | default: |
| 1005 | break; |
| 1006 | } |
| 1007 | err: |
| 1008 | return ret; |
| 1009 | } |
| 1010 | #endif |
| 1011 | |
| 1012 | /* |
| 1013 | * This is not used by anonymous file descriptors. This code is left |
| 1014 | * there if we ever want to implement an inode with open() operation. |
| 1015 | */ |
| 1016 | static |
| 1017 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) |
| 1018 | { |
| 1019 | struct lttng_metadata_stream *stream = inode->i_private; |
| 1020 | struct lib_ring_buffer *buf = stream->priv; |
| 1021 | |
| 1022 | file->private_data = buf; |
| 1023 | /* |
| 1024 | * Since life-time of metadata cache differs from that of |
| 1025 | * session, we need to keep our own reference on the transport. |
| 1026 | */ |
| 1027 | if (!try_module_get(stream->transport->owner)) { |
| 1028 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); |
| 1029 | return -EBUSY; |
| 1030 | } |
| 1031 | return lib_ring_buffer_open(inode, file, buf); |
| 1032 | } |
| 1033 | |
| 1034 | static |
| 1035 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) |
| 1036 | { |
| 1037 | struct lttng_metadata_stream *stream = file->private_data; |
| 1038 | struct lib_ring_buffer *buf = stream->priv; |
| 1039 | |
| 1040 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
| 1041 | module_put(stream->transport->owner); |
| 1042 | return lib_ring_buffer_release(inode, file, buf); |
| 1043 | } |
| 1044 | |
| 1045 | static |
| 1046 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, |
| 1047 | struct pipe_inode_info *pipe, size_t len, |
| 1048 | unsigned int flags) |
| 1049 | { |
| 1050 | struct lttng_metadata_stream *stream = in->private_data; |
| 1051 | struct lib_ring_buffer *buf = stream->priv; |
| 1052 | |
| 1053 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, |
| 1054 | flags, buf); |
| 1055 | } |
| 1056 | |
| 1057 | static |
| 1058 | int lttng_metadata_ring_buffer_mmap(struct file *filp, |
| 1059 | struct vm_area_struct *vma) |
| 1060 | { |
| 1061 | struct lttng_metadata_stream *stream = filp->private_data; |
| 1062 | struct lib_ring_buffer *buf = stream->priv; |
| 1063 | |
| 1064 | return lib_ring_buffer_mmap(filp, vma, buf); |
| 1065 | } |
| 1066 | |
| 1067 | static |
| 1068 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { |
| 1069 | .owner = THIS_MODULE, |
| 1070 | .open = lttng_metadata_ring_buffer_open, |
| 1071 | .release = lttng_metadata_ring_buffer_release, |
| 1072 | .poll = lttng_metadata_ring_buffer_poll, |
| 1073 | .splice_read = lttng_metadata_ring_buffer_splice_read, |
| 1074 | .mmap = lttng_metadata_ring_buffer_mmap, |
| 1075 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, |
| 1076 | .llseek = vfs_lib_ring_buffer_no_llseek, |
| 1077 | #ifdef CONFIG_COMPAT |
| 1078 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, |
| 1079 | #endif |
| 1080 | }; |
| 1081 | |
| 1082 | static |
| 1083 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, |
| 1084 | const struct file_operations *fops) |
| 1085 | { |
| 1086 | int stream_fd, ret; |
| 1087 | struct file *stream_file; |
| 1088 | |
| 1089 | stream_fd = lttng_get_unused_fd(); |
| 1090 | if (stream_fd < 0) { |
| 1091 | ret = stream_fd; |
| 1092 | goto fd_error; |
| 1093 | } |
| 1094 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
| 1095 | stream_priv, O_RDWR); |
| 1096 | if (IS_ERR(stream_file)) { |
| 1097 | ret = PTR_ERR(stream_file); |
| 1098 | goto file_error; |
| 1099 | } |
| 1100 | /* |
| 1101 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor |
| 1102 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this |
| 1103 | * file descriptor, so we set FMODE_PREAD here. |
| 1104 | */ |
| 1105 | stream_file->f_mode |= FMODE_PREAD; |
| 1106 | fd_install(stream_fd, stream_file); |
| 1107 | /* |
| 1108 | * The stream holds a reference to the channel within the generic ring |
| 1109 | * buffer library, so no need to hold a refcount on the channel and |
| 1110 | * session files here. |
| 1111 | */ |
| 1112 | return stream_fd; |
| 1113 | |
| 1114 | file_error: |
| 1115 | put_unused_fd(stream_fd); |
| 1116 | fd_error: |
| 1117 | return ret; |
| 1118 | } |
| 1119 | |
| 1120 | static |
| 1121 | int lttng_abi_open_stream(struct file *channel_file) |
| 1122 | { |
| 1123 | struct lttng_channel *channel = channel_file->private_data; |
| 1124 | struct lib_ring_buffer *buf; |
| 1125 | int ret; |
| 1126 | void *stream_priv; |
| 1127 | |
| 1128 | buf = channel->ops->buffer_read_open(channel->chan); |
| 1129 | if (!buf) |
| 1130 | return -ENOENT; |
| 1131 | |
| 1132 | stream_priv = buf; |
| 1133 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
| 1134 | <tng_stream_ring_buffer_file_operations); |
| 1135 | if (ret < 0) |
| 1136 | goto fd_error; |
| 1137 | |
| 1138 | return ret; |
| 1139 | |
| 1140 | fd_error: |
| 1141 | channel->ops->buffer_read_close(buf); |
| 1142 | return ret; |
| 1143 | } |
| 1144 | |
| 1145 | static |
| 1146 | int lttng_abi_open_metadata_stream(struct file *channel_file) |
| 1147 | { |
| 1148 | struct lttng_channel *channel = channel_file->private_data; |
| 1149 | struct lttng_session *session = channel->session; |
| 1150 | struct lib_ring_buffer *buf; |
| 1151 | int ret; |
| 1152 | struct lttng_metadata_stream *metadata_stream; |
| 1153 | void *stream_priv; |
| 1154 | |
| 1155 | buf = channel->ops->buffer_read_open(channel->chan); |
| 1156 | if (!buf) |
| 1157 | return -ENOENT; |
| 1158 | |
| 1159 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), |
| 1160 | GFP_KERNEL); |
| 1161 | if (!metadata_stream) { |
| 1162 | ret = -ENOMEM; |
| 1163 | goto nomem; |
| 1164 | } |
| 1165 | metadata_stream->metadata_cache = session->metadata_cache; |
| 1166 | init_waitqueue_head(&metadata_stream->read_wait); |
| 1167 | metadata_stream->priv = buf; |
| 1168 | stream_priv = metadata_stream; |
| 1169 | metadata_stream->transport = channel->transport; |
| 1170 | |
| 1171 | /* |
| 1172 | * Since life-time of metadata cache differs from that of |
| 1173 | * session, we need to keep our own reference on the transport. |
| 1174 | */ |
| 1175 | if (!try_module_get(metadata_stream->transport->owner)) { |
| 1176 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); |
| 1177 | ret = -EINVAL; |
| 1178 | goto notransport; |
| 1179 | } |
| 1180 | |
| 1181 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
| 1182 | ret = -EOVERFLOW; |
| 1183 | goto kref_error; |
| 1184 | } |
| 1185 | |
| 1186 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
| 1187 | <tng_metadata_ring_buffer_file_operations); |
| 1188 | if (ret < 0) |
| 1189 | goto fd_error; |
| 1190 | |
| 1191 | list_add(&metadata_stream->list, |
| 1192 | &session->metadata_cache->metadata_stream); |
| 1193 | return ret; |
| 1194 | |
| 1195 | fd_error: |
| 1196 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
| 1197 | kref_error: |
| 1198 | module_put(metadata_stream->transport->owner); |
| 1199 | notransport: |
| 1200 | kfree(metadata_stream); |
| 1201 | nomem: |
| 1202 | channel->ops->buffer_read_close(buf); |
| 1203 | return ret; |
| 1204 | } |
| 1205 | |
| 1206 | static |
| 1207 | int lttng_abi_create_event(struct file *channel_file, |
| 1208 | struct lttng_kernel_event *event_param) |
| 1209 | { |
| 1210 | struct lttng_channel *channel = channel_file->private_data; |
| 1211 | int event_fd, ret; |
| 1212 | struct file *event_file; |
| 1213 | void *priv; |
| 1214 | |
| 1215 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 1216 | switch (event_param->instrumentation) { |
| 1217 | case LTTNG_KERNEL_KRETPROBE: |
| 1218 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 1219 | break; |
| 1220 | case LTTNG_KERNEL_KPROBE: |
| 1221 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 1222 | break; |
| 1223 | case LTTNG_KERNEL_FUNCTION: |
| 1224 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 1225 | break; |
| 1226 | default: |
| 1227 | break; |
| 1228 | } |
| 1229 | event_fd = lttng_get_unused_fd(); |
| 1230 | if (event_fd < 0) { |
| 1231 | ret = event_fd; |
| 1232 | goto fd_error; |
| 1233 | } |
| 1234 | event_file = anon_inode_getfile("[lttng_event]", |
| 1235 | <tng_event_fops, |
| 1236 | NULL, O_RDWR); |
| 1237 | if (IS_ERR(event_file)) { |
| 1238 | ret = PTR_ERR(event_file); |
| 1239 | goto file_error; |
| 1240 | } |
| 1241 | /* The event holds a reference on the channel */ |
| 1242 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
| 1243 | ret = -EOVERFLOW; |
| 1244 | goto refcount_error; |
| 1245 | } |
| 1246 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
| 1247 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { |
| 1248 | struct lttng_enabler *enabler; |
| 1249 | |
| 1250 | if (strutils_is_star_glob_pattern(event_param->name)) { |
| 1251 | /* |
| 1252 | * If the event name is a star globbing pattern, |
| 1253 | * we create the special star globbing enabler. |
| 1254 | */ |
| 1255 | enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB, |
| 1256 | event_param, channel); |
| 1257 | } else { |
| 1258 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
| 1259 | event_param, channel); |
| 1260 | } |
| 1261 | priv = enabler; |
| 1262 | } else { |
| 1263 | struct lttng_event *event; |
| 1264 | |
| 1265 | /* |
| 1266 | * We tolerate no failure path after event creation. It |
| 1267 | * will stay invariant for the rest of the session. |
| 1268 | */ |
| 1269 | event = lttng_event_create(channel, event_param, |
| 1270 | NULL, NULL, |
| 1271 | event_param->instrumentation); |
| 1272 | WARN_ON_ONCE(!event); |
| 1273 | if (IS_ERR(event)) { |
| 1274 | ret = PTR_ERR(event); |
| 1275 | goto event_error; |
| 1276 | } |
| 1277 | priv = event; |
| 1278 | } |
| 1279 | event_file->private_data = priv; |
| 1280 | fd_install(event_fd, event_file); |
| 1281 | return event_fd; |
| 1282 | |
| 1283 | event_error: |
| 1284 | atomic_long_dec(&channel_file->f_count); |
| 1285 | refcount_error: |
| 1286 | fput(event_file); |
| 1287 | file_error: |
| 1288 | put_unused_fd(event_fd); |
| 1289 | fd_error: |
| 1290 | return ret; |
| 1291 | } |
| 1292 | |
| 1293 | /** |
| 1294 | * lttng_channel_ioctl - lttng syscall through ioctl |
| 1295 | * |
| 1296 | * @file: the file |
| 1297 | * @cmd: the command |
| 1298 | * @arg: command arg |
| 1299 | * |
| 1300 | * This ioctl implements lttng commands: |
| 1301 | * LTTNG_KERNEL_STREAM |
| 1302 | * Returns an event stream file descriptor or failure. |
| 1303 | * (typically, one event stream records events from one CPU) |
| 1304 | * LTTNG_KERNEL_EVENT |
| 1305 | * Returns an event file descriptor or failure. |
| 1306 | * LTTNG_KERNEL_CONTEXT |
| 1307 | * Prepend a context field to each event in the channel |
| 1308 | * LTTNG_KERNEL_ENABLE |
| 1309 | * Enable recording for events in this channel (weak enable) |
| 1310 | * LTTNG_KERNEL_DISABLE |
| 1311 | * Disable recording for events in this channel (strong disable) |
| 1312 | * |
| 1313 | * Channel and event file descriptors also hold a reference on the session. |
| 1314 | */ |
| 1315 | static |
| 1316 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1317 | { |
| 1318 | struct lttng_channel *channel = file->private_data; |
| 1319 | |
| 1320 | switch (cmd) { |
| 1321 | case LTTNG_KERNEL_OLD_STREAM: |
| 1322 | case LTTNG_KERNEL_STREAM: |
| 1323 | return lttng_abi_open_stream(file); |
| 1324 | case LTTNG_KERNEL_OLD_EVENT: |
| 1325 | { |
| 1326 | struct lttng_kernel_event *uevent_param; |
| 1327 | struct lttng_kernel_old_event *old_uevent_param; |
| 1328 | int ret; |
| 1329 | |
| 1330 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), |
| 1331 | GFP_KERNEL); |
| 1332 | if (!uevent_param) { |
| 1333 | ret = -ENOMEM; |
| 1334 | goto old_event_end; |
| 1335 | } |
| 1336 | old_uevent_param = kmalloc( |
| 1337 | sizeof(struct lttng_kernel_old_event), |
| 1338 | GFP_KERNEL); |
| 1339 | if (!old_uevent_param) { |
| 1340 | ret = -ENOMEM; |
| 1341 | goto old_event_error_free_param; |
| 1342 | } |
| 1343 | if (copy_from_user(old_uevent_param, |
| 1344 | (struct lttng_kernel_old_event __user *) arg, |
| 1345 | sizeof(struct lttng_kernel_old_event))) { |
| 1346 | ret = -EFAULT; |
| 1347 | goto old_event_error_free_old_param; |
| 1348 | } |
| 1349 | |
| 1350 | memcpy(uevent_param->name, old_uevent_param->name, |
| 1351 | sizeof(uevent_param->name)); |
| 1352 | uevent_param->instrumentation = |
| 1353 | old_uevent_param->instrumentation; |
| 1354 | |
| 1355 | switch (old_uevent_param->instrumentation) { |
| 1356 | case LTTNG_KERNEL_KPROBE: |
| 1357 | uevent_param->u.kprobe.addr = |
| 1358 | old_uevent_param->u.kprobe.addr; |
| 1359 | uevent_param->u.kprobe.offset = |
| 1360 | old_uevent_param->u.kprobe.offset; |
| 1361 | memcpy(uevent_param->u.kprobe.symbol_name, |
| 1362 | old_uevent_param->u.kprobe.symbol_name, |
| 1363 | sizeof(uevent_param->u.kprobe.symbol_name)); |
| 1364 | break; |
| 1365 | case LTTNG_KERNEL_KRETPROBE: |
| 1366 | uevent_param->u.kretprobe.addr = |
| 1367 | old_uevent_param->u.kretprobe.addr; |
| 1368 | uevent_param->u.kretprobe.offset = |
| 1369 | old_uevent_param->u.kretprobe.offset; |
| 1370 | memcpy(uevent_param->u.kretprobe.symbol_name, |
| 1371 | old_uevent_param->u.kretprobe.symbol_name, |
| 1372 | sizeof(uevent_param->u.kretprobe.symbol_name)); |
| 1373 | break; |
| 1374 | case LTTNG_KERNEL_FUNCTION: |
| 1375 | memcpy(uevent_param->u.ftrace.symbol_name, |
| 1376 | old_uevent_param->u.ftrace.symbol_name, |
| 1377 | sizeof(uevent_param->u.ftrace.symbol_name)); |
| 1378 | break; |
| 1379 | default: |
| 1380 | break; |
| 1381 | } |
| 1382 | ret = lttng_abi_create_event(file, uevent_param); |
| 1383 | |
| 1384 | old_event_error_free_old_param: |
| 1385 | kfree(old_uevent_param); |
| 1386 | old_event_error_free_param: |
| 1387 | kfree(uevent_param); |
| 1388 | old_event_end: |
| 1389 | return ret; |
| 1390 | } |
| 1391 | case LTTNG_KERNEL_EVENT: |
| 1392 | { |
| 1393 | struct lttng_kernel_event uevent_param; |
| 1394 | |
| 1395 | if (copy_from_user(&uevent_param, |
| 1396 | (struct lttng_kernel_event __user *) arg, |
| 1397 | sizeof(uevent_param))) |
| 1398 | return -EFAULT; |
| 1399 | return lttng_abi_create_event(file, &uevent_param); |
| 1400 | } |
| 1401 | case LTTNG_KERNEL_OLD_CONTEXT: |
| 1402 | { |
| 1403 | struct lttng_kernel_context *ucontext_param; |
| 1404 | struct lttng_kernel_old_context *old_ucontext_param; |
| 1405 | int ret; |
| 1406 | |
| 1407 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), |
| 1408 | GFP_KERNEL); |
| 1409 | if (!ucontext_param) { |
| 1410 | ret = -ENOMEM; |
| 1411 | goto old_ctx_end; |
| 1412 | } |
| 1413 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), |
| 1414 | GFP_KERNEL); |
| 1415 | if (!old_ucontext_param) { |
| 1416 | ret = -ENOMEM; |
| 1417 | goto old_ctx_error_free_param; |
| 1418 | } |
| 1419 | |
| 1420 | if (copy_from_user(old_ucontext_param, |
| 1421 | (struct lttng_kernel_old_context __user *) arg, |
| 1422 | sizeof(struct lttng_kernel_old_context))) { |
| 1423 | ret = -EFAULT; |
| 1424 | goto old_ctx_error_free_old_param; |
| 1425 | } |
| 1426 | ucontext_param->ctx = old_ucontext_param->ctx; |
| 1427 | memcpy(ucontext_param->padding, old_ucontext_param->padding, |
| 1428 | sizeof(ucontext_param->padding)); |
| 1429 | /* only type that uses the union */ |
| 1430 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { |
| 1431 | ucontext_param->u.perf_counter.type = |
| 1432 | old_ucontext_param->u.perf_counter.type; |
| 1433 | ucontext_param->u.perf_counter.config = |
| 1434 | old_ucontext_param->u.perf_counter.config; |
| 1435 | memcpy(ucontext_param->u.perf_counter.name, |
| 1436 | old_ucontext_param->u.perf_counter.name, |
| 1437 | sizeof(ucontext_param->u.perf_counter.name)); |
| 1438 | } |
| 1439 | |
| 1440 | ret = lttng_abi_add_context(file, |
| 1441 | ucontext_param, |
| 1442 | &channel->ctx, channel->session); |
| 1443 | |
| 1444 | old_ctx_error_free_old_param: |
| 1445 | kfree(old_ucontext_param); |
| 1446 | old_ctx_error_free_param: |
| 1447 | kfree(ucontext_param); |
| 1448 | old_ctx_end: |
| 1449 | return ret; |
| 1450 | } |
| 1451 | case LTTNG_KERNEL_CONTEXT: |
| 1452 | { |
| 1453 | struct lttng_kernel_context ucontext_param; |
| 1454 | |
| 1455 | if (copy_from_user(&ucontext_param, |
| 1456 | (struct lttng_kernel_context __user *) arg, |
| 1457 | sizeof(ucontext_param))) |
| 1458 | return -EFAULT; |
| 1459 | return lttng_abi_add_context(file, |
| 1460 | &ucontext_param, |
| 1461 | &channel->ctx, channel->session); |
| 1462 | } |
| 1463 | case LTTNG_KERNEL_OLD_ENABLE: |
| 1464 | case LTTNG_KERNEL_ENABLE: |
| 1465 | return lttng_channel_enable(channel); |
| 1466 | case LTTNG_KERNEL_OLD_DISABLE: |
| 1467 | case LTTNG_KERNEL_DISABLE: |
| 1468 | return lttng_channel_disable(channel); |
| 1469 | case LTTNG_KERNEL_SYSCALL_MASK: |
| 1470 | return lttng_channel_syscall_mask(channel, |
| 1471 | (struct lttng_kernel_syscall_mask __user *) arg); |
| 1472 | default: |
| 1473 | return -ENOIOCTLCMD; |
| 1474 | } |
| 1475 | } |
| 1476 | |
| 1477 | /** |
| 1478 | * lttng_metadata_ioctl - lttng syscall through ioctl |
| 1479 | * |
| 1480 | * @file: the file |
| 1481 | * @cmd: the command |
| 1482 | * @arg: command arg |
| 1483 | * |
| 1484 | * This ioctl implements lttng commands: |
| 1485 | * LTTNG_KERNEL_STREAM |
| 1486 | * Returns an event stream file descriptor or failure. |
| 1487 | * |
| 1488 | * Channel and event file descriptors also hold a reference on the session. |
| 1489 | */ |
| 1490 | static |
| 1491 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1492 | { |
| 1493 | switch (cmd) { |
| 1494 | case LTTNG_KERNEL_OLD_STREAM: |
| 1495 | case LTTNG_KERNEL_STREAM: |
| 1496 | return lttng_abi_open_metadata_stream(file); |
| 1497 | default: |
| 1498 | return -ENOIOCTLCMD; |
| 1499 | } |
| 1500 | } |
| 1501 | |
| 1502 | /** |
| 1503 | * lttng_channel_poll - lttng stream addition/removal monitoring |
| 1504 | * |
| 1505 | * @file: the file |
| 1506 | * @wait: poll table |
| 1507 | */ |
| 1508 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
| 1509 | { |
| 1510 | struct lttng_channel *channel = file->private_data; |
| 1511 | unsigned int mask = 0; |
| 1512 | |
| 1513 | if (file->f_mode & FMODE_READ) { |
| 1514 | poll_wait_set_exclusive(wait); |
| 1515 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
| 1516 | wait); |
| 1517 | |
| 1518 | if (channel->ops->is_disabled(channel->chan)) |
| 1519 | return POLLERR; |
| 1520 | if (channel->ops->is_finalized(channel->chan)) |
| 1521 | return POLLHUP; |
| 1522 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
| 1523 | return POLLIN | POLLRDNORM; |
| 1524 | return 0; |
| 1525 | } |
| 1526 | return mask; |
| 1527 | |
| 1528 | } |
| 1529 | |
| 1530 | static |
| 1531 | int lttng_channel_release(struct inode *inode, struct file *file) |
| 1532 | { |
| 1533 | struct lttng_channel *channel = file->private_data; |
| 1534 | |
| 1535 | if (channel) |
| 1536 | fput(channel->session->file); |
| 1537 | return 0; |
| 1538 | } |
| 1539 | |
| 1540 | static |
| 1541 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) |
| 1542 | { |
| 1543 | struct lttng_channel *channel = file->private_data; |
| 1544 | |
| 1545 | if (channel) { |
| 1546 | fput(channel->session->file); |
| 1547 | lttng_metadata_channel_destroy(channel); |
| 1548 | } |
| 1549 | |
| 1550 | return 0; |
| 1551 | } |
| 1552 | |
| 1553 | static const struct file_operations lttng_channel_fops = { |
| 1554 | .owner = THIS_MODULE, |
| 1555 | .release = lttng_channel_release, |
| 1556 | .poll = lttng_channel_poll, |
| 1557 | .unlocked_ioctl = lttng_channel_ioctl, |
| 1558 | #ifdef CONFIG_COMPAT |
| 1559 | .compat_ioctl = lttng_channel_ioctl, |
| 1560 | #endif |
| 1561 | }; |
| 1562 | |
| 1563 | static const struct file_operations lttng_metadata_fops = { |
| 1564 | .owner = THIS_MODULE, |
| 1565 | .release = lttng_metadata_channel_release, |
| 1566 | .unlocked_ioctl = lttng_metadata_ioctl, |
| 1567 | #ifdef CONFIG_COMPAT |
| 1568 | .compat_ioctl = lttng_metadata_ioctl, |
| 1569 | #endif |
| 1570 | }; |
| 1571 | |
| 1572 | /** |
| 1573 | * lttng_event_ioctl - lttng syscall through ioctl |
| 1574 | * |
| 1575 | * @file: the file |
| 1576 | * @cmd: the command |
| 1577 | * @arg: command arg |
| 1578 | * |
| 1579 | * This ioctl implements lttng commands: |
| 1580 | * LTTNG_KERNEL_CONTEXT |
| 1581 | * Prepend a context field to each record of this event |
| 1582 | * LTTNG_KERNEL_ENABLE |
| 1583 | * Enable recording for this event (weak enable) |
| 1584 | * LTTNG_KERNEL_DISABLE |
| 1585 | * Disable recording for this event (strong disable) |
| 1586 | */ |
| 1587 | static |
| 1588 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1589 | { |
| 1590 | struct lttng_event *event; |
| 1591 | struct lttng_enabler *enabler; |
| 1592 | enum lttng_event_type *evtype = file->private_data; |
| 1593 | |
| 1594 | switch (cmd) { |
| 1595 | case LTTNG_KERNEL_OLD_CONTEXT: |
| 1596 | { |
| 1597 | /* Not implemented */ |
| 1598 | return -ENOSYS; |
| 1599 | } |
| 1600 | case LTTNG_KERNEL_CONTEXT: |
| 1601 | { |
| 1602 | /* Not implemented */ |
| 1603 | return -ENOSYS; |
| 1604 | } |
| 1605 | case LTTNG_KERNEL_OLD_ENABLE: |
| 1606 | case LTTNG_KERNEL_ENABLE: |
| 1607 | switch (*evtype) { |
| 1608 | case LTTNG_TYPE_EVENT: |
| 1609 | event = file->private_data; |
| 1610 | return lttng_event_enable(event); |
| 1611 | case LTTNG_TYPE_ENABLER: |
| 1612 | enabler = file->private_data; |
| 1613 | return lttng_enabler_enable(enabler); |
| 1614 | default: |
| 1615 | WARN_ON_ONCE(1); |
| 1616 | return -ENOSYS; |
| 1617 | } |
| 1618 | case LTTNG_KERNEL_OLD_DISABLE: |
| 1619 | case LTTNG_KERNEL_DISABLE: |
| 1620 | switch (*evtype) { |
| 1621 | case LTTNG_TYPE_EVENT: |
| 1622 | event = file->private_data; |
| 1623 | return lttng_event_disable(event); |
| 1624 | case LTTNG_TYPE_ENABLER: |
| 1625 | enabler = file->private_data; |
| 1626 | return lttng_enabler_disable(enabler); |
| 1627 | default: |
| 1628 | WARN_ON_ONCE(1); |
| 1629 | return -ENOSYS; |
| 1630 | } |
| 1631 | case LTTNG_KERNEL_FILTER: |
| 1632 | switch (*evtype) { |
| 1633 | case LTTNG_TYPE_EVENT: |
| 1634 | return -EINVAL; |
| 1635 | case LTTNG_TYPE_ENABLER: |
| 1636 | { |
| 1637 | enabler = file->private_data; |
| 1638 | return lttng_enabler_attach_bytecode(enabler, |
| 1639 | (struct lttng_kernel_filter_bytecode __user *) arg); |
| 1640 | } |
| 1641 | default: |
| 1642 | WARN_ON_ONCE(1); |
| 1643 | return -ENOSYS; |
| 1644 | } |
| 1645 | case LTTNG_KERNEL_ADD_CALLSITE: |
| 1646 | switch (*evtype) { |
| 1647 | case LTTNG_TYPE_EVENT: |
| 1648 | event = file->private_data; |
| 1649 | return lttng_event_add_callsite(event, |
| 1650 | (struct lttng_kernel_event_callsite __user *) arg); |
| 1651 | case LTTNG_TYPE_ENABLER: |
| 1652 | return -EINVAL; |
| 1653 | default: |
| 1654 | WARN_ON_ONCE(1); |
| 1655 | return -ENOSYS; |
| 1656 | } |
| 1657 | default: |
| 1658 | return -ENOIOCTLCMD; |
| 1659 | } |
| 1660 | } |
| 1661 | |
| 1662 | static |
| 1663 | int lttng_event_release(struct inode *inode, struct file *file) |
| 1664 | { |
| 1665 | struct lttng_event *event; |
| 1666 | struct lttng_enabler *enabler; |
| 1667 | enum lttng_event_type *evtype = file->private_data; |
| 1668 | |
| 1669 | if (!evtype) |
| 1670 | return 0; |
| 1671 | |
| 1672 | switch (*evtype) { |
| 1673 | case LTTNG_TYPE_EVENT: |
| 1674 | event = file->private_data; |
| 1675 | if (event) |
| 1676 | fput(event->chan->file); |
| 1677 | break; |
| 1678 | case LTTNG_TYPE_ENABLER: |
| 1679 | enabler = file->private_data; |
| 1680 | if (enabler) |
| 1681 | fput(enabler->chan->file); |
| 1682 | break; |
| 1683 | default: |
| 1684 | WARN_ON_ONCE(1); |
| 1685 | break; |
| 1686 | } |
| 1687 | |
| 1688 | return 0; |
| 1689 | } |
| 1690 | |
| 1691 | /* TODO: filter control ioctl */ |
| 1692 | static const struct file_operations lttng_event_fops = { |
| 1693 | .owner = THIS_MODULE, |
| 1694 | .release = lttng_event_release, |
| 1695 | .unlocked_ioctl = lttng_event_ioctl, |
| 1696 | #ifdef CONFIG_COMPAT |
| 1697 | .compat_ioctl = lttng_event_ioctl, |
| 1698 | #endif |
| 1699 | }; |
| 1700 | |
| 1701 | static int put_u64(uint64_t val, unsigned long arg) |
| 1702 | { |
| 1703 | return put_user(val, (uint64_t __user *) arg); |
| 1704 | } |
| 1705 | |
| 1706 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
| 1707 | unsigned int cmd, unsigned long arg) |
| 1708 | { |
| 1709 | struct lib_ring_buffer *buf = filp->private_data; |
| 1710 | struct channel *chan = buf->backend.chan; |
| 1711 | const struct lib_ring_buffer_config *config = &chan->backend.config; |
| 1712 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
| 1713 | int ret; |
| 1714 | |
| 1715 | if (atomic_read(&chan->record_disabled)) |
| 1716 | return -EIO; |
| 1717 | |
| 1718 | switch (cmd) { |
| 1719 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
| 1720 | { |
| 1721 | uint64_t ts; |
| 1722 | |
| 1723 | ret = ops->timestamp_begin(config, buf, &ts); |
| 1724 | if (ret < 0) |
| 1725 | goto error; |
| 1726 | return put_u64(ts, arg); |
| 1727 | } |
| 1728 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: |
| 1729 | { |
| 1730 | uint64_t ts; |
| 1731 | |
| 1732 | ret = ops->timestamp_end(config, buf, &ts); |
| 1733 | if (ret < 0) |
| 1734 | goto error; |
| 1735 | return put_u64(ts, arg); |
| 1736 | } |
| 1737 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: |
| 1738 | { |
| 1739 | uint64_t ed; |
| 1740 | |
| 1741 | ret = ops->events_discarded(config, buf, &ed); |
| 1742 | if (ret < 0) |
| 1743 | goto error; |
| 1744 | return put_u64(ed, arg); |
| 1745 | } |
| 1746 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: |
| 1747 | { |
| 1748 | uint64_t cs; |
| 1749 | |
| 1750 | ret = ops->content_size(config, buf, &cs); |
| 1751 | if (ret < 0) |
| 1752 | goto error; |
| 1753 | return put_u64(cs, arg); |
| 1754 | } |
| 1755 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: |
| 1756 | { |
| 1757 | uint64_t ps; |
| 1758 | |
| 1759 | ret = ops->packet_size(config, buf, &ps); |
| 1760 | if (ret < 0) |
| 1761 | goto error; |
| 1762 | return put_u64(ps, arg); |
| 1763 | } |
| 1764 | case LTTNG_RING_BUFFER_GET_STREAM_ID: |
| 1765 | { |
| 1766 | uint64_t si; |
| 1767 | |
| 1768 | ret = ops->stream_id(config, buf, &si); |
| 1769 | if (ret < 0) |
| 1770 | goto error; |
| 1771 | return put_u64(si, arg); |
| 1772 | } |
| 1773 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
| 1774 | { |
| 1775 | uint64_t ts; |
| 1776 | |
| 1777 | ret = ops->current_timestamp(config, buf, &ts); |
| 1778 | if (ret < 0) |
| 1779 | goto error; |
| 1780 | return put_u64(ts, arg); |
| 1781 | } |
| 1782 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
| 1783 | { |
| 1784 | uint64_t seq; |
| 1785 | |
| 1786 | ret = ops->sequence_number(config, buf, &seq); |
| 1787 | if (ret < 0) |
| 1788 | goto error; |
| 1789 | return put_u64(seq, arg); |
| 1790 | } |
| 1791 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
| 1792 | { |
| 1793 | uint64_t id; |
| 1794 | |
| 1795 | ret = ops->instance_id(config, buf, &id); |
| 1796 | if (ret < 0) |
| 1797 | goto error; |
| 1798 | return put_u64(id, arg); |
| 1799 | } |
| 1800 | default: |
| 1801 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, |
| 1802 | cmd, arg); |
| 1803 | } |
| 1804 | |
| 1805 | error: |
| 1806 | return -ENOSYS; |
| 1807 | } |
| 1808 | |
| 1809 | #ifdef CONFIG_COMPAT |
| 1810 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, |
| 1811 | unsigned int cmd, unsigned long arg) |
| 1812 | { |
| 1813 | struct lib_ring_buffer *buf = filp->private_data; |
| 1814 | struct channel *chan = buf->backend.chan; |
| 1815 | const struct lib_ring_buffer_config *config = &chan->backend.config; |
| 1816 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
| 1817 | int ret; |
| 1818 | |
| 1819 | if (atomic_read(&chan->record_disabled)) |
| 1820 | return -EIO; |
| 1821 | |
| 1822 | switch (cmd) { |
| 1823 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
| 1824 | { |
| 1825 | uint64_t ts; |
| 1826 | |
| 1827 | ret = ops->timestamp_begin(config, buf, &ts); |
| 1828 | if (ret < 0) |
| 1829 | goto error; |
| 1830 | return put_u64(ts, arg); |
| 1831 | } |
| 1832 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: |
| 1833 | { |
| 1834 | uint64_t ts; |
| 1835 | |
| 1836 | ret = ops->timestamp_end(config, buf, &ts); |
| 1837 | if (ret < 0) |
| 1838 | goto error; |
| 1839 | return put_u64(ts, arg); |
| 1840 | } |
| 1841 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: |
| 1842 | { |
| 1843 | uint64_t ed; |
| 1844 | |
| 1845 | ret = ops->events_discarded(config, buf, &ed); |
| 1846 | if (ret < 0) |
| 1847 | goto error; |
| 1848 | return put_u64(ed, arg); |
| 1849 | } |
| 1850 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
| 1851 | { |
| 1852 | uint64_t cs; |
| 1853 | |
| 1854 | ret = ops->content_size(config, buf, &cs); |
| 1855 | if (ret < 0) |
| 1856 | goto error; |
| 1857 | return put_u64(cs, arg); |
| 1858 | } |
| 1859 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: |
| 1860 | { |
| 1861 | uint64_t ps; |
| 1862 | |
| 1863 | ret = ops->packet_size(config, buf, &ps); |
| 1864 | if (ret < 0) |
| 1865 | goto error; |
| 1866 | return put_u64(ps, arg); |
| 1867 | } |
| 1868 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: |
| 1869 | { |
| 1870 | uint64_t si; |
| 1871 | |
| 1872 | ret = ops->stream_id(config, buf, &si); |
| 1873 | if (ret < 0) |
| 1874 | goto error; |
| 1875 | return put_u64(si, arg); |
| 1876 | } |
| 1877 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
| 1878 | { |
| 1879 | uint64_t ts; |
| 1880 | |
| 1881 | ret = ops->current_timestamp(config, buf, &ts); |
| 1882 | if (ret < 0) |
| 1883 | goto error; |
| 1884 | return put_u64(ts, arg); |
| 1885 | } |
| 1886 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
| 1887 | { |
| 1888 | uint64_t seq; |
| 1889 | |
| 1890 | ret = ops->sequence_number(config, buf, &seq); |
| 1891 | if (ret < 0) |
| 1892 | goto error; |
| 1893 | return put_u64(seq, arg); |
| 1894 | } |
| 1895 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
| 1896 | { |
| 1897 | uint64_t id; |
| 1898 | |
| 1899 | ret = ops->instance_id(config, buf, &id); |
| 1900 | if (ret < 0) |
| 1901 | goto error; |
| 1902 | return put_u64(id, arg); |
| 1903 | } |
| 1904 | default: |
| 1905 | return lib_ring_buffer_file_operations.compat_ioctl(filp, |
| 1906 | cmd, arg); |
| 1907 | } |
| 1908 | |
| 1909 | error: |
| 1910 | return -ENOSYS; |
| 1911 | } |
| 1912 | #endif /* CONFIG_COMPAT */ |
| 1913 | |
| 1914 | static void lttng_stream_override_ring_buffer_fops(void) |
| 1915 | { |
| 1916 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; |
| 1917 | lttng_stream_ring_buffer_file_operations.open = |
| 1918 | lib_ring_buffer_file_operations.open; |
| 1919 | lttng_stream_ring_buffer_file_operations.release = |
| 1920 | lib_ring_buffer_file_operations.release; |
| 1921 | lttng_stream_ring_buffer_file_operations.poll = |
| 1922 | lib_ring_buffer_file_operations.poll; |
| 1923 | lttng_stream_ring_buffer_file_operations.splice_read = |
| 1924 | lib_ring_buffer_file_operations.splice_read; |
| 1925 | lttng_stream_ring_buffer_file_operations.mmap = |
| 1926 | lib_ring_buffer_file_operations.mmap; |
| 1927 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = |
| 1928 | lttng_stream_ring_buffer_ioctl; |
| 1929 | lttng_stream_ring_buffer_file_operations.llseek = |
| 1930 | lib_ring_buffer_file_operations.llseek; |
| 1931 | #ifdef CONFIG_COMPAT |
| 1932 | lttng_stream_ring_buffer_file_operations.compat_ioctl = |
| 1933 | lttng_stream_ring_buffer_compat_ioctl; |
| 1934 | #endif |
| 1935 | } |
| 1936 | |
| 1937 | int __init lttng_abi_init(void) |
| 1938 | { |
| 1939 | int ret = 0; |
| 1940 | |
| 1941 | wrapper_vmalloc_sync_all(); |
| 1942 | lttng_clock_ref(); |
| 1943 | |
| 1944 | ret = lttng_tp_mempool_init(); |
| 1945 | if (ret) { |
| 1946 | goto error; |
| 1947 | } |
| 1948 | |
| 1949 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
| 1950 | <tng_proc_ops, NULL); |
| 1951 | |
| 1952 | if (!lttng_proc_dentry) { |
| 1953 | printk(KERN_ERR "Error creating LTTng control file\n"); |
| 1954 | ret = -ENOMEM; |
| 1955 | goto error; |
| 1956 | } |
| 1957 | lttng_stream_override_ring_buffer_fops(); |
| 1958 | return 0; |
| 1959 | |
| 1960 | error: |
| 1961 | lttng_tp_mempool_destroy(); |
| 1962 | lttng_clock_unref(); |
| 1963 | return ret; |
| 1964 | } |
| 1965 | |
| 1966 | /* No __exit annotation because used by init error path too. */ |
| 1967 | void lttng_abi_exit(void) |
| 1968 | { |
| 1969 | lttng_tp_mempool_destroy(); |
| 1970 | lttng_clock_unref(); |
| 1971 | if (lttng_proc_dentry) |
| 1972 | remove_proc_entry("lttng", NULL); |
| 1973 | } |