| 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/compiler_attributes.h> |
| 34 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
| 35 | #include <wrapper/ringbuffer/vfs.h> |
| 36 | #include <wrapper/ringbuffer/backend.h> |
| 37 | #include <wrapper/ringbuffer/frontend.h> |
| 38 | #include <wrapper/poll.h> |
| 39 | #include <wrapper/file.h> |
| 40 | #include <wrapper/kref.h> |
| 41 | #include <lttng-string-utils.h> |
| 42 | #include <lttng-abi.h> |
| 43 | #include <lttng-abi-old.h> |
| 44 | #include <lttng-events.h> |
| 45 | #include <lttng-tracer.h> |
| 46 | #include <lttng-tp-mempool.h> |
| 47 | #include <lib/ringbuffer/frontend_types.h> |
| 48 | |
| 49 | /* |
| 50 | * This is LTTng's own personal way to create a system call as an external |
| 51 | * module. We use ioctl() on /proc/lttng. |
| 52 | */ |
| 53 | |
| 54 | static struct proc_dir_entry *lttng_proc_dentry; |
| 55 | |
| 56 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_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 | |
| 62 | static const struct file_operations lttng_session_fops; |
| 63 | static const struct file_operations lttng_channel_fops; |
| 64 | static const struct file_operations lttng_metadata_fops; |
| 65 | static const struct file_operations lttng_event_fops; |
| 66 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
| 67 | |
| 68 | static int put_u64(uint64_t val, unsigned long arg); |
| 69 | static int put_u32(uint32_t val, unsigned long arg); |
| 70 | |
| 71 | /* |
| 72 | * Teardown management: opened file descriptors keep a refcount on the module, |
| 73 | * so it can only exit when all file descriptors are closed. |
| 74 | */ |
| 75 | |
| 76 | static |
| 77 | int lttng_abi_create_session(void) |
| 78 | { |
| 79 | struct lttng_session *session; |
| 80 | struct file *session_file; |
| 81 | int session_fd, ret; |
| 82 | |
| 83 | session = lttng_session_create(); |
| 84 | if (!session) |
| 85 | return -ENOMEM; |
| 86 | session_fd = lttng_get_unused_fd(); |
| 87 | if (session_fd < 0) { |
| 88 | ret = session_fd; |
| 89 | goto fd_error; |
| 90 | } |
| 91 | session_file = anon_inode_getfile("[lttng_session]", |
| 92 | <tng_session_fops, |
| 93 | session, O_RDWR); |
| 94 | if (IS_ERR(session_file)) { |
| 95 | ret = PTR_ERR(session_file); |
| 96 | goto file_error; |
| 97 | } |
| 98 | session->file = session_file; |
| 99 | fd_install(session_fd, session_file); |
| 100 | return session_fd; |
| 101 | |
| 102 | file_error: |
| 103 | put_unused_fd(session_fd); |
| 104 | fd_error: |
| 105 | lttng_session_destroy(session); |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | static |
| 110 | int lttng_abi_tracepoint_list(void) |
| 111 | { |
| 112 | struct file *tracepoint_list_file; |
| 113 | int file_fd, ret; |
| 114 | |
| 115 | file_fd = lttng_get_unused_fd(); |
| 116 | if (file_fd < 0) { |
| 117 | ret = file_fd; |
| 118 | goto fd_error; |
| 119 | } |
| 120 | |
| 121 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
| 122 | <tng_tracepoint_list_fops, |
| 123 | NULL, O_RDWR); |
| 124 | if (IS_ERR(tracepoint_list_file)) { |
| 125 | ret = PTR_ERR(tracepoint_list_file); |
| 126 | goto file_error; |
| 127 | } |
| 128 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
| 129 | if (ret < 0) |
| 130 | goto open_error; |
| 131 | fd_install(file_fd, tracepoint_list_file); |
| 132 | return file_fd; |
| 133 | |
| 134 | open_error: |
| 135 | fput(tracepoint_list_file); |
| 136 | file_error: |
| 137 | put_unused_fd(file_fd); |
| 138 | fd_error: |
| 139 | return ret; |
| 140 | } |
| 141 | |
| 142 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
| 143 | static inline |
| 144 | int lttng_abi_syscall_list(void) |
| 145 | { |
| 146 | return -ENOSYS; |
| 147 | } |
| 148 | #else |
| 149 | static |
| 150 | int lttng_abi_syscall_list(void) |
| 151 | { |
| 152 | struct file *syscall_list_file; |
| 153 | int file_fd, ret; |
| 154 | |
| 155 | file_fd = lttng_get_unused_fd(); |
| 156 | if (file_fd < 0) { |
| 157 | ret = file_fd; |
| 158 | goto fd_error; |
| 159 | } |
| 160 | |
| 161 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", |
| 162 | <tng_syscall_list_fops, |
| 163 | NULL, O_RDWR); |
| 164 | if (IS_ERR(syscall_list_file)) { |
| 165 | ret = PTR_ERR(syscall_list_file); |
| 166 | goto file_error; |
| 167 | } |
| 168 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); |
| 169 | if (ret < 0) |
| 170 | goto open_error; |
| 171 | fd_install(file_fd, syscall_list_file); |
| 172 | return file_fd; |
| 173 | |
| 174 | open_error: |
| 175 | fput(syscall_list_file); |
| 176 | file_error: |
| 177 | put_unused_fd(file_fd); |
| 178 | fd_error: |
| 179 | return ret; |
| 180 | } |
| 181 | #endif |
| 182 | |
| 183 | static |
| 184 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
| 185 | { |
| 186 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
| 187 | v->minor = LTTNG_MODULES_MINOR_VERSION; |
| 188 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; |
| 189 | } |
| 190 | |
| 191 | static |
| 192 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) |
| 193 | { |
| 194 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; |
| 195 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; |
| 196 | } |
| 197 | |
| 198 | static |
| 199 | long lttng_abi_add_context(struct file *file, |
| 200 | struct lttng_kernel_context *context_param, |
| 201 | struct lttng_ctx **ctx, struct lttng_session *session) |
| 202 | { |
| 203 | |
| 204 | if (session->been_active) |
| 205 | return -EPERM; |
| 206 | |
| 207 | switch (context_param->ctx) { |
| 208 | case LTTNG_KERNEL_CONTEXT_PID: |
| 209 | return lttng_add_pid_to_ctx(ctx); |
| 210 | case LTTNG_KERNEL_CONTEXT_PRIO: |
| 211 | return lttng_add_prio_to_ctx(ctx); |
| 212 | case LTTNG_KERNEL_CONTEXT_NICE: |
| 213 | return lttng_add_nice_to_ctx(ctx); |
| 214 | case LTTNG_KERNEL_CONTEXT_VPID: |
| 215 | return lttng_add_vpid_to_ctx(ctx); |
| 216 | case LTTNG_KERNEL_CONTEXT_TID: |
| 217 | return lttng_add_tid_to_ctx(ctx); |
| 218 | case LTTNG_KERNEL_CONTEXT_VTID: |
| 219 | return lttng_add_vtid_to_ctx(ctx); |
| 220 | case LTTNG_KERNEL_CONTEXT_PPID: |
| 221 | return lttng_add_ppid_to_ctx(ctx); |
| 222 | case LTTNG_KERNEL_CONTEXT_VPPID: |
| 223 | return lttng_add_vppid_to_ctx(ctx); |
| 224 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
| 225 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 226 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, |
| 227 | context_param->u.perf_counter.config, |
| 228 | context_param->u.perf_counter.name, |
| 229 | ctx); |
| 230 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
| 231 | return lttng_add_procname_to_ctx(ctx); |
| 232 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
| 233 | return lttng_add_hostname_to_ctx(ctx); |
| 234 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
| 235 | return lttng_add_cpu_id_to_ctx(ctx); |
| 236 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
| 237 | return lttng_add_interruptible_to_ctx(ctx); |
| 238 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: |
| 239 | return lttng_add_need_reschedule_to_ctx(ctx); |
| 240 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: |
| 241 | return lttng_add_preemptible_to_ctx(ctx); |
| 242 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: |
| 243 | return lttng_add_migratable_to_ctx(ctx); |
| 244 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
| 245 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: |
| 246 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); |
| 247 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
| 248 | return lttng_add_cgroup_ns_to_ctx(ctx); |
| 249 | case LTTNG_KERNEL_CONTEXT_IPC_NS: |
| 250 | return lttng_add_ipc_ns_to_ctx(ctx); |
| 251 | case LTTNG_KERNEL_CONTEXT_MNT_NS: |
| 252 | return lttng_add_mnt_ns_to_ctx(ctx); |
| 253 | case LTTNG_KERNEL_CONTEXT_NET_NS: |
| 254 | return lttng_add_net_ns_to_ctx(ctx); |
| 255 | case LTTNG_KERNEL_CONTEXT_PID_NS: |
| 256 | return lttng_add_pid_ns_to_ctx(ctx); |
| 257 | case LTTNG_KERNEL_CONTEXT_USER_NS: |
| 258 | return lttng_add_user_ns_to_ctx(ctx); |
| 259 | case LTTNG_KERNEL_CONTEXT_UTS_NS: |
| 260 | return lttng_add_uts_ns_to_ctx(ctx); |
| 261 | case LTTNG_KERNEL_CONTEXT_UID: |
| 262 | return lttng_add_uid_to_ctx(ctx); |
| 263 | case LTTNG_KERNEL_CONTEXT_EUID: |
| 264 | return lttng_add_euid_to_ctx(ctx); |
| 265 | case LTTNG_KERNEL_CONTEXT_SUID: |
| 266 | return lttng_add_suid_to_ctx(ctx); |
| 267 | case LTTNG_KERNEL_CONTEXT_GID: |
| 268 | return lttng_add_gid_to_ctx(ctx); |
| 269 | case LTTNG_KERNEL_CONTEXT_EGID: |
| 270 | return lttng_add_egid_to_ctx(ctx); |
| 271 | case LTTNG_KERNEL_CONTEXT_SGID: |
| 272 | return lttng_add_sgid_to_ctx(ctx); |
| 273 | case LTTNG_KERNEL_CONTEXT_VUID: |
| 274 | return lttng_add_vuid_to_ctx(ctx); |
| 275 | case LTTNG_KERNEL_CONTEXT_VEUID: |
| 276 | return lttng_add_veuid_to_ctx(ctx); |
| 277 | case LTTNG_KERNEL_CONTEXT_VSUID: |
| 278 | return lttng_add_vsuid_to_ctx(ctx); |
| 279 | case LTTNG_KERNEL_CONTEXT_VGID: |
| 280 | return lttng_add_vgid_to_ctx(ctx); |
| 281 | case LTTNG_KERNEL_CONTEXT_VEGID: |
| 282 | return lttng_add_vegid_to_ctx(ctx); |
| 283 | case LTTNG_KERNEL_CONTEXT_VSGID: |
| 284 | return lttng_add_vsgid_to_ctx(ctx); |
| 285 | default: |
| 286 | return -EINVAL; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | /** |
| 291 | * lttng_ioctl - lttng syscall through ioctl |
| 292 | * |
| 293 | * @file: the file |
| 294 | * @cmd: the command |
| 295 | * @arg: command arg |
| 296 | * |
| 297 | * This ioctl implements lttng commands: |
| 298 | * LTTNG_KERNEL_SESSION |
| 299 | * Returns a LTTng trace session file descriptor |
| 300 | * LTTNG_KERNEL_TRACER_VERSION |
| 301 | * Returns the LTTng kernel tracer version |
| 302 | * LTTNG_KERNEL_TRACEPOINT_LIST |
| 303 | * Returns a file descriptor listing available tracepoints |
| 304 | * LTTNG_KERNEL_WAIT_QUIESCENT |
| 305 | * Returns after all previously running probes have completed |
| 306 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
| 307 | * Returns the LTTng kernel tracer ABI version |
| 308 | * |
| 309 | * The returned session will be deleted when its file descriptor is closed. |
| 310 | */ |
| 311 | static |
| 312 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 313 | { |
| 314 | switch (cmd) { |
| 315 | case LTTNG_KERNEL_OLD_SESSION: |
| 316 | case LTTNG_KERNEL_SESSION: |
| 317 | return lttng_abi_create_session(); |
| 318 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
| 319 | { |
| 320 | struct lttng_kernel_tracer_version v; |
| 321 | struct lttng_kernel_old_tracer_version oldv; |
| 322 | struct lttng_kernel_old_tracer_version *uversion = |
| 323 | (struct lttng_kernel_old_tracer_version __user *) arg; |
| 324 | |
| 325 | lttng_abi_tracer_version(&v); |
| 326 | oldv.major = v.major; |
| 327 | oldv.minor = v.minor; |
| 328 | oldv.patchlevel = v.patchlevel; |
| 329 | |
| 330 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) |
| 331 | return -EFAULT; |
| 332 | return 0; |
| 333 | } |
| 334 | case LTTNG_KERNEL_TRACER_VERSION: |
| 335 | { |
| 336 | struct lttng_kernel_tracer_version version; |
| 337 | struct lttng_kernel_tracer_version *uversion = |
| 338 | (struct lttng_kernel_tracer_version __user *) arg; |
| 339 | |
| 340 | lttng_abi_tracer_version(&version); |
| 341 | |
| 342 | if (copy_to_user(uversion, &version, sizeof(version))) |
| 343 | return -EFAULT; |
| 344 | return 0; |
| 345 | } |
| 346 | case LTTNG_KERNEL_TRACER_ABI_VERSION: |
| 347 | { |
| 348 | struct lttng_kernel_tracer_abi_version version; |
| 349 | struct lttng_kernel_tracer_abi_version *uversion = |
| 350 | (struct lttng_kernel_tracer_abi_version __user *) arg; |
| 351 | |
| 352 | lttng_abi_tracer_abi_version(&version); |
| 353 | |
| 354 | if (copy_to_user(uversion, &version, sizeof(version))) |
| 355 | return -EFAULT; |
| 356 | return 0; |
| 357 | } |
| 358 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: |
| 359 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
| 360 | return lttng_abi_tracepoint_list(); |
| 361 | case LTTNG_KERNEL_SYSCALL_LIST: |
| 362 | return lttng_abi_syscall_list(); |
| 363 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
| 364 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
| 365 | synchronize_trace(); |
| 366 | return 0; |
| 367 | case LTTNG_KERNEL_OLD_CALIBRATE: |
| 368 | { |
| 369 | struct lttng_kernel_old_calibrate __user *ucalibrate = |
| 370 | (struct lttng_kernel_old_calibrate __user *) arg; |
| 371 | struct lttng_kernel_old_calibrate old_calibrate; |
| 372 | struct lttng_kernel_calibrate calibrate; |
| 373 | int ret; |
| 374 | |
| 375 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) |
| 376 | return -EFAULT; |
| 377 | calibrate.type = old_calibrate.type; |
| 378 | ret = lttng_calibrate(&calibrate); |
| 379 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) |
| 380 | return -EFAULT; |
| 381 | return ret; |
| 382 | } |
| 383 | case LTTNG_KERNEL_CALIBRATE: |
| 384 | { |
| 385 | struct lttng_kernel_calibrate __user *ucalibrate = |
| 386 | (struct lttng_kernel_calibrate __user *) arg; |
| 387 | struct lttng_kernel_calibrate calibrate; |
| 388 | int ret; |
| 389 | |
| 390 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) |
| 391 | return -EFAULT; |
| 392 | ret = lttng_calibrate(&calibrate); |
| 393 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) |
| 394 | return -EFAULT; |
| 395 | return ret; |
| 396 | } |
| 397 | default: |
| 398 | return -ENOIOCTLCMD; |
| 399 | } |
| 400 | } |
| 401 | |
| 402 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
| 403 | static const struct proc_ops lttng_proc_ops = { |
| 404 | .proc_ioctl = lttng_ioctl, |
| 405 | #ifdef CONFIG_COMPAT |
| 406 | .proc_compat_ioctl = lttng_ioctl, |
| 407 | #endif /* CONFIG_COMPAT */ |
| 408 | }; |
| 409 | #else |
| 410 | static const struct file_operations lttng_proc_ops = { |
| 411 | .owner = THIS_MODULE, |
| 412 | .unlocked_ioctl = lttng_ioctl, |
| 413 | #ifdef CONFIG_COMPAT |
| 414 | .compat_ioctl = lttng_ioctl, |
| 415 | #endif /* CONFIG_COMPAT */ |
| 416 | }; |
| 417 | #endif |
| 418 | |
| 419 | static |
| 420 | int lttng_abi_create_channel(struct file *session_file, |
| 421 | struct lttng_kernel_channel *chan_param, |
| 422 | enum channel_type channel_type) |
| 423 | { |
| 424 | struct lttng_session *session = session_file->private_data; |
| 425 | const struct file_operations *fops = NULL; |
| 426 | const char *transport_name; |
| 427 | struct lttng_channel *chan; |
| 428 | struct file *chan_file; |
| 429 | int chan_fd; |
| 430 | int ret = 0; |
| 431 | |
| 432 | chan_fd = lttng_get_unused_fd(); |
| 433 | if (chan_fd < 0) { |
| 434 | ret = chan_fd; |
| 435 | goto fd_error; |
| 436 | } |
| 437 | switch (channel_type) { |
| 438 | case PER_CPU_CHANNEL: |
| 439 | fops = <tng_channel_fops; |
| 440 | break; |
| 441 | case METADATA_CHANNEL: |
| 442 | fops = <tng_metadata_fops; |
| 443 | break; |
| 444 | } |
| 445 | |
| 446 | chan_file = anon_inode_getfile("[lttng_channel]", |
| 447 | fops, |
| 448 | NULL, O_RDWR); |
| 449 | if (IS_ERR(chan_file)) { |
| 450 | ret = PTR_ERR(chan_file); |
| 451 | goto file_error; |
| 452 | } |
| 453 | switch (channel_type) { |
| 454 | case PER_CPU_CHANNEL: |
| 455 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
| 456 | transport_name = chan_param->overwrite ? |
| 457 | "relay-overwrite" : "relay-discard"; |
| 458 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
| 459 | transport_name = chan_param->overwrite ? |
| 460 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
| 461 | } else { |
| 462 | return -EINVAL; |
| 463 | } |
| 464 | break; |
| 465 | case METADATA_CHANNEL: |
| 466 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
| 467 | transport_name = "relay-metadata"; |
| 468 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
| 469 | transport_name = "relay-metadata-mmap"; |
| 470 | else |
| 471 | return -EINVAL; |
| 472 | break; |
| 473 | default: |
| 474 | transport_name = "<unknown>"; |
| 475 | break; |
| 476 | } |
| 477 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
| 478 | ret = -EOVERFLOW; |
| 479 | goto refcount_error; |
| 480 | } |
| 481 | /* |
| 482 | * We tolerate no failure path after channel creation. It will stay |
| 483 | * invariant for the rest of the session. |
| 484 | */ |
| 485 | chan = lttng_channel_create(session, transport_name, NULL, |
| 486 | chan_param->subbuf_size, |
| 487 | chan_param->num_subbuf, |
| 488 | chan_param->switch_timer_interval, |
| 489 | chan_param->read_timer_interval, |
| 490 | channel_type); |
| 491 | if (!chan) { |
| 492 | ret = -EINVAL; |
| 493 | goto chan_error; |
| 494 | } |
| 495 | chan->file = chan_file; |
| 496 | chan_file->private_data = chan; |
| 497 | fd_install(chan_fd, chan_file); |
| 498 | |
| 499 | return chan_fd; |
| 500 | |
| 501 | chan_error: |
| 502 | atomic_long_dec(&session_file->f_count); |
| 503 | refcount_error: |
| 504 | fput(chan_file); |
| 505 | file_error: |
| 506 | put_unused_fd(chan_fd); |
| 507 | fd_error: |
| 508 | return ret; |
| 509 | } |
| 510 | |
| 511 | static |
| 512 | int lttng_abi_session_set_name(struct lttng_session *session, |
| 513 | struct lttng_kernel_session_name *name) |
| 514 | { |
| 515 | size_t len; |
| 516 | |
| 517 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); |
| 518 | |
| 519 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { |
| 520 | /* Name is too long/malformed */ |
| 521 | return -EINVAL; |
| 522 | } |
| 523 | |
| 524 | strcpy(session->name, name->name); |
| 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | static |
| 529 | int lttng_abi_session_set_creation_time(struct lttng_session *session, |
| 530 | struct lttng_kernel_session_creation_time *time) |
| 531 | { |
| 532 | size_t len; |
| 533 | |
| 534 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); |
| 535 | |
| 536 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { |
| 537 | /* Time is too long/malformed */ |
| 538 | return -EINVAL; |
| 539 | } |
| 540 | |
| 541 | strcpy(session->creation_time, time->iso8601); |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | static |
| 546 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) |
| 547 | { |
| 548 | switch (tracker->type) { |
| 549 | case LTTNG_KERNEL_TRACKER_PID: |
| 550 | return TRACKER_PID; |
| 551 | case LTTNG_KERNEL_TRACKER_VPID: |
| 552 | return TRACKER_VPID; |
| 553 | case LTTNG_KERNEL_TRACKER_UID: |
| 554 | return TRACKER_UID; |
| 555 | case LTTNG_KERNEL_TRACKER_VUID: |
| 556 | return TRACKER_VUID; |
| 557 | case LTTNG_KERNEL_TRACKER_GID: |
| 558 | return TRACKER_GID; |
| 559 | case LTTNG_KERNEL_TRACKER_VGID: |
| 560 | return TRACKER_VGID; |
| 561 | default: |
| 562 | return TRACKER_UNKNOWN; |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | /** |
| 567 | * lttng_session_ioctl - lttng session fd ioctl |
| 568 | * |
| 569 | * @file: the file |
| 570 | * @cmd: the command |
| 571 | * @arg: command arg |
| 572 | * |
| 573 | * This ioctl implements lttng commands: |
| 574 | * LTTNG_KERNEL_CHANNEL |
| 575 | * Returns a LTTng channel file descriptor |
| 576 | * LTTNG_KERNEL_ENABLE |
| 577 | * Enables tracing for a session (weak enable) |
| 578 | * LTTNG_KERNEL_DISABLE |
| 579 | * Disables tracing for a session (strong disable) |
| 580 | * LTTNG_KERNEL_METADATA |
| 581 | * Returns a LTTng metadata file descriptor |
| 582 | * LTTNG_KERNEL_SESSION_TRACK_PID |
| 583 | * Add PID to session PID tracker |
| 584 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
| 585 | * Remove PID from session PID tracker |
| 586 | * LTTNG_KERNEL_SESSION_TRACK_ID |
| 587 | * Add ID to tracker |
| 588 | * LTTNG_KERNEL_SESSION_UNTRACK_ID |
| 589 | * Remove ID from tracker |
| 590 | * |
| 591 | * The returned channel will be deleted when its file descriptor is closed. |
| 592 | */ |
| 593 | static |
| 594 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 595 | { |
| 596 | struct lttng_session *session = file->private_data; |
| 597 | struct lttng_kernel_channel chan_param; |
| 598 | struct lttng_kernel_old_channel old_chan_param; |
| 599 | |
| 600 | switch (cmd) { |
| 601 | case LTTNG_KERNEL_OLD_CHANNEL: |
| 602 | { |
| 603 | if (copy_from_user(&old_chan_param, |
| 604 | (struct lttng_kernel_old_channel __user *) arg, |
| 605 | sizeof(struct lttng_kernel_old_channel))) |
| 606 | return -EFAULT; |
| 607 | chan_param.overwrite = old_chan_param.overwrite; |
| 608 | chan_param.subbuf_size = old_chan_param.subbuf_size; |
| 609 | chan_param.num_subbuf = old_chan_param.num_subbuf; |
| 610 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; |
| 611 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; |
| 612 | chan_param.output = old_chan_param.output; |
| 613 | |
| 614 | return lttng_abi_create_channel(file, &chan_param, |
| 615 | PER_CPU_CHANNEL); |
| 616 | } |
| 617 | case LTTNG_KERNEL_CHANNEL: |
| 618 | { |
| 619 | if (copy_from_user(&chan_param, |
| 620 | (struct lttng_kernel_channel __user *) arg, |
| 621 | sizeof(struct lttng_kernel_channel))) |
| 622 | return -EFAULT; |
| 623 | return lttng_abi_create_channel(file, &chan_param, |
| 624 | PER_CPU_CHANNEL); |
| 625 | } |
| 626 | case LTTNG_KERNEL_OLD_SESSION_START: |
| 627 | case LTTNG_KERNEL_OLD_ENABLE: |
| 628 | case LTTNG_KERNEL_SESSION_START: |
| 629 | case LTTNG_KERNEL_ENABLE: |
| 630 | return lttng_session_enable(session); |
| 631 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
| 632 | case LTTNG_KERNEL_OLD_DISABLE: |
| 633 | case LTTNG_KERNEL_SESSION_STOP: |
| 634 | case LTTNG_KERNEL_DISABLE: |
| 635 | return lttng_session_disable(session); |
| 636 | case LTTNG_KERNEL_OLD_METADATA: |
| 637 | { |
| 638 | if (copy_from_user(&old_chan_param, |
| 639 | (struct lttng_kernel_old_channel __user *) arg, |
| 640 | sizeof(struct lttng_kernel_old_channel))) |
| 641 | return -EFAULT; |
| 642 | chan_param.overwrite = old_chan_param.overwrite; |
| 643 | chan_param.subbuf_size = old_chan_param.subbuf_size; |
| 644 | chan_param.num_subbuf = old_chan_param.num_subbuf; |
| 645 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; |
| 646 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; |
| 647 | chan_param.output = old_chan_param.output; |
| 648 | |
| 649 | return lttng_abi_create_channel(file, &chan_param, |
| 650 | METADATA_CHANNEL); |
| 651 | } |
| 652 | case LTTNG_KERNEL_METADATA: |
| 653 | { |
| 654 | if (copy_from_user(&chan_param, |
| 655 | (struct lttng_kernel_channel __user *) arg, |
| 656 | sizeof(struct lttng_kernel_channel))) |
| 657 | return -EFAULT; |
| 658 | return lttng_abi_create_channel(file, &chan_param, |
| 659 | METADATA_CHANNEL); |
| 660 | } |
| 661 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
| 662 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
| 663 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
| 664 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
| 665 | case LTTNG_KERNEL_SESSION_TRACK_ID: |
| 666 | { |
| 667 | struct lttng_kernel_tracker_args tracker; |
| 668 | enum tracker_type tracker_type; |
| 669 | |
| 670 | if (copy_from_user(&tracker, |
| 671 | (struct lttng_kernel_tracker_args __user *) arg, |
| 672 | sizeof(struct lttng_kernel_tracker_args))) |
| 673 | return -EFAULT; |
| 674 | tracker_type = get_tracker_type(&tracker); |
| 675 | if (tracker_type == TRACKER_UNKNOWN) |
| 676 | return -EINVAL; |
| 677 | return lttng_session_track_id(session, tracker_type, tracker.id); |
| 678 | } |
| 679 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: |
| 680 | { |
| 681 | struct lttng_kernel_tracker_args tracker; |
| 682 | enum tracker_type tracker_type; |
| 683 | |
| 684 | if (copy_from_user(&tracker, |
| 685 | (struct lttng_kernel_tracker_args __user *) arg, |
| 686 | sizeof(struct lttng_kernel_tracker_args))) |
| 687 | return -EFAULT; |
| 688 | tracker_type = get_tracker_type(&tracker); |
| 689 | if (tracker_type == TRACKER_UNKNOWN) |
| 690 | return -EINVAL; |
| 691 | return lttng_session_untrack_id(session, tracker_type, |
| 692 | tracker.id); |
| 693 | } |
| 694 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
| 695 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
| 696 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: |
| 697 | { |
| 698 | struct lttng_kernel_tracker_args tracker; |
| 699 | enum tracker_type tracker_type; |
| 700 | |
| 701 | if (copy_from_user(&tracker, |
| 702 | (struct lttng_kernel_tracker_args __user *) arg, |
| 703 | sizeof(struct lttng_kernel_tracker_args))) |
| 704 | return -EFAULT; |
| 705 | tracker_type = get_tracker_type(&tracker); |
| 706 | if (tracker_type == TRACKER_UNKNOWN) |
| 707 | return -EINVAL; |
| 708 | return lttng_session_list_tracker_ids(session, tracker_type); |
| 709 | } |
| 710 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
| 711 | return lttng_session_metadata_regenerate(session); |
| 712 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
| 713 | return lttng_session_statedump(session); |
| 714 | case LTTNG_KERNEL_SESSION_SET_NAME: |
| 715 | { |
| 716 | struct lttng_kernel_session_name name; |
| 717 | |
| 718 | if (copy_from_user(&name, |
| 719 | (struct lttng_kernel_session_name __user *) arg, |
| 720 | sizeof(struct lttng_kernel_session_name))) |
| 721 | return -EFAULT; |
| 722 | return lttng_abi_session_set_name(session, &name); |
| 723 | } |
| 724 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
| 725 | { |
| 726 | struct lttng_kernel_session_creation_time time; |
| 727 | |
| 728 | if (copy_from_user(&time, |
| 729 | (struct lttng_kernel_session_creation_time __user *) arg, |
| 730 | sizeof(struct lttng_kernel_session_creation_time))) |
| 731 | return -EFAULT; |
| 732 | return lttng_abi_session_set_creation_time(session, &time); |
| 733 | } |
| 734 | default: |
| 735 | return -ENOIOCTLCMD; |
| 736 | } |
| 737 | } |
| 738 | |
| 739 | /* |
| 740 | * Called when the last file reference is dropped. |
| 741 | * |
| 742 | * Big fat note: channels and events are invariant for the whole session after |
| 743 | * their creation. So this session destruction also destroys all channel and |
| 744 | * event structures specific to this session (they are not destroyed when their |
| 745 | * individual file is released). |
| 746 | */ |
| 747 | static |
| 748 | int lttng_session_release(struct inode *inode, struct file *file) |
| 749 | { |
| 750 | struct lttng_session *session = file->private_data; |
| 751 | |
| 752 | if (session) |
| 753 | lttng_session_destroy(session); |
| 754 | return 0; |
| 755 | } |
| 756 | |
| 757 | static const struct file_operations lttng_session_fops = { |
| 758 | .owner = THIS_MODULE, |
| 759 | .release = lttng_session_release, |
| 760 | .unlocked_ioctl = lttng_session_ioctl, |
| 761 | #ifdef CONFIG_COMPAT |
| 762 | .compat_ioctl = lttng_session_ioctl, |
| 763 | #endif |
| 764 | }; |
| 765 | |
| 766 | /** |
| 767 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation |
| 768 | * @filp: the file |
| 769 | * @wait: poll table |
| 770 | * |
| 771 | * Handles the poll operations for the metadata channels. |
| 772 | */ |
| 773 | static |
| 774 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
| 775 | poll_table *wait) |
| 776 | { |
| 777 | struct lttng_metadata_stream *stream = filp->private_data; |
| 778 | struct lib_ring_buffer *buf = stream->priv; |
| 779 | int finalized; |
| 780 | unsigned int mask = 0; |
| 781 | |
| 782 | if (filp->f_mode & FMODE_READ) { |
| 783 | poll_wait_set_exclusive(wait); |
| 784 | poll_wait(filp, &stream->read_wait, wait); |
| 785 | |
| 786 | finalized = stream->finalized; |
| 787 | |
| 788 | /* |
| 789 | * lib_ring_buffer_is_finalized() contains a smp_rmb() |
| 790 | * ordering finalized load before offsets loads. |
| 791 | */ |
| 792 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); |
| 793 | |
| 794 | if (finalized) |
| 795 | mask |= POLLHUP; |
| 796 | |
| 797 | mutex_lock(&stream->metadata_cache->lock); |
| 798 | if (stream->metadata_cache->metadata_written > |
| 799 | stream->metadata_out) |
| 800 | mask |= POLLIN; |
| 801 | mutex_unlock(&stream->metadata_cache->lock); |
| 802 | } |
| 803 | |
| 804 | return mask; |
| 805 | } |
| 806 | |
| 807 | static |
| 808 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, |
| 809 | unsigned int cmd, unsigned long arg) |
| 810 | { |
| 811 | struct lttng_metadata_stream *stream = filp->private_data; |
| 812 | |
| 813 | stream->metadata_out = stream->metadata_in; |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * Reset the counter of how much metadata has been consumed to 0. That way, |
| 818 | * the consumer receives the content of the metadata cache unchanged. This is |
| 819 | * different from the metadata_regenerate where the offset from epoch is |
| 820 | * resampled, here we want the exact same content as the last time the metadata |
| 821 | * was generated. This command is only possible if all the metadata written |
| 822 | * in the cache has been output to the metadata stream to avoid corrupting the |
| 823 | * metadata file. |
| 824 | * |
| 825 | * Return 0 on success, a negative value on error. |
| 826 | */ |
| 827 | static |
| 828 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) |
| 829 | { |
| 830 | int ret; |
| 831 | struct lttng_metadata_cache *cache = stream->metadata_cache; |
| 832 | |
| 833 | mutex_lock(&cache->lock); |
| 834 | if (stream->metadata_out != cache->metadata_written) { |
| 835 | ret = -EBUSY; |
| 836 | goto end; |
| 837 | } |
| 838 | stream->metadata_out = 0; |
| 839 | stream->metadata_in = 0; |
| 840 | wake_up_interruptible(&stream->read_wait); |
| 841 | ret = 0; |
| 842 | |
| 843 | end: |
| 844 | mutex_unlock(&cache->lock); |
| 845 | return ret; |
| 846 | } |
| 847 | |
| 848 | static |
| 849 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, |
| 850 | unsigned int cmd, unsigned long arg) |
| 851 | { |
| 852 | int ret; |
| 853 | struct lttng_metadata_stream *stream = filp->private_data; |
| 854 | struct lib_ring_buffer *buf = stream->priv; |
| 855 | unsigned int rb_cmd; |
| 856 | bool coherent; |
| 857 | |
| 858 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
| 859 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; |
| 860 | else |
| 861 | rb_cmd = cmd; |
| 862 | |
| 863 | switch (cmd) { |
| 864 | case RING_BUFFER_GET_NEXT_SUBBUF: |
| 865 | { |
| 866 | struct lttng_metadata_stream *stream = filp->private_data; |
| 867 | struct lib_ring_buffer *buf = stream->priv; |
| 868 | struct channel *chan = buf->backend.chan; |
| 869 | |
| 870 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
| 871 | if (ret > 0) { |
| 872 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); |
| 873 | ret = 0; |
| 874 | } else if (ret < 0) |
| 875 | goto err; |
| 876 | break; |
| 877 | } |
| 878 | case RING_BUFFER_GET_SUBBUF: |
| 879 | { |
| 880 | /* |
| 881 | * Random access is not allowed for metadata channel. |
| 882 | */ |
| 883 | return -ENOSYS; |
| 884 | } |
| 885 | case RING_BUFFER_FLUSH_EMPTY: |
| 886 | lttng_fallthrough; |
| 887 | case RING_BUFFER_FLUSH: |
| 888 | { |
| 889 | struct lttng_metadata_stream *stream = filp->private_data; |
| 890 | struct lib_ring_buffer *buf = stream->priv; |
| 891 | struct channel *chan = buf->backend.chan; |
| 892 | |
| 893 | /* |
| 894 | * Before doing the actual ring buffer flush, write up to one |
| 895 | * packet of metadata in the ring buffer. |
| 896 | */ |
| 897 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
| 898 | if (ret < 0) |
| 899 | goto err; |
| 900 | break; |
| 901 | } |
| 902 | case RING_BUFFER_GET_METADATA_VERSION: |
| 903 | { |
| 904 | struct lttng_metadata_stream *stream = filp->private_data; |
| 905 | |
| 906 | return put_u64(stream->version, arg); |
| 907 | } |
| 908 | case RING_BUFFER_METADATA_CACHE_DUMP: |
| 909 | { |
| 910 | struct lttng_metadata_stream *stream = filp->private_data; |
| 911 | |
| 912 | return lttng_metadata_cache_dump(stream); |
| 913 | } |
| 914 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
| 915 | { |
| 916 | struct lttng_metadata_stream *stream = filp->private_data; |
| 917 | struct lib_ring_buffer *buf = stream->priv; |
| 918 | struct channel *chan = buf->backend.chan; |
| 919 | |
| 920 | ret = lttng_metadata_output_channel(stream, chan, &coherent); |
| 921 | if (ret > 0) { |
| 922 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); |
| 923 | ret = 0; |
| 924 | } else if (ret < 0) { |
| 925 | goto err; |
| 926 | } |
| 927 | break; |
| 928 | } |
| 929 | default: |
| 930 | break; |
| 931 | } |
| 932 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
| 933 | |
| 934 | /* Performing lib ring buffer ioctl after our own. */ |
| 935 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
| 936 | if (ret < 0) |
| 937 | goto err; |
| 938 | |
| 939 | switch (cmd) { |
| 940 | case RING_BUFFER_PUT_NEXT_SUBBUF: |
| 941 | { |
| 942 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, |
| 943 | cmd, arg); |
| 944 | break; |
| 945 | } |
| 946 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
| 947 | { |
| 948 | return put_u32(coherent, arg); |
| 949 | } |
| 950 | default: |
| 951 | break; |
| 952 | } |
| 953 | err: |
| 954 | return ret; |
| 955 | } |
| 956 | |
| 957 | #ifdef CONFIG_COMPAT |
| 958 | static |
| 959 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, |
| 960 | unsigned int cmd, unsigned long arg) |
| 961 | { |
| 962 | int ret; |
| 963 | struct lttng_metadata_stream *stream = filp->private_data; |
| 964 | struct lib_ring_buffer *buf = stream->priv; |
| 965 | unsigned int rb_cmd; |
| 966 | bool coherent; |
| 967 | |
| 968 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) |
| 969 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; |
| 970 | else |
| 971 | rb_cmd = cmd; |
| 972 | |
| 973 | switch (cmd) { |
| 974 | case RING_BUFFER_GET_NEXT_SUBBUF: |
| 975 | { |
| 976 | struct lttng_metadata_stream *stream = filp->private_data; |
| 977 | struct lib_ring_buffer *buf = stream->priv; |
| 978 | struct channel *chan = buf->backend.chan; |
| 979 | |
| 980 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
| 981 | if (ret > 0) { |
| 982 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); |
| 983 | ret = 0; |
| 984 | } else if (ret < 0) |
| 985 | goto err; |
| 986 | break; |
| 987 | } |
| 988 | case RING_BUFFER_GET_SUBBUF: |
| 989 | { |
| 990 | /* |
| 991 | * Random access is not allowed for metadata channel. |
| 992 | */ |
| 993 | return -ENOSYS; |
| 994 | } |
| 995 | case RING_BUFFER_FLUSH_EMPTY: |
| 996 | lttng_fallthrough; |
| 997 | case RING_BUFFER_FLUSH: |
| 998 | { |
| 999 | struct lttng_metadata_stream *stream = filp->private_data; |
| 1000 | struct lib_ring_buffer *buf = stream->priv; |
| 1001 | struct channel *chan = buf->backend.chan; |
| 1002 | |
| 1003 | /* |
| 1004 | * Before doing the actual ring buffer flush, write up to one |
| 1005 | * packet of metadata in the ring buffer. |
| 1006 | */ |
| 1007 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
| 1008 | if (ret < 0) |
| 1009 | goto err; |
| 1010 | break; |
| 1011 | } |
| 1012 | case RING_BUFFER_GET_METADATA_VERSION: |
| 1013 | { |
| 1014 | struct lttng_metadata_stream *stream = filp->private_data; |
| 1015 | |
| 1016 | return put_u64(stream->version, arg); |
| 1017 | } |
| 1018 | case RING_BUFFER_METADATA_CACHE_DUMP: |
| 1019 | { |
| 1020 | struct lttng_metadata_stream *stream = filp->private_data; |
| 1021 | |
| 1022 | return lttng_metadata_cache_dump(stream); |
| 1023 | } |
| 1024 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
| 1025 | { |
| 1026 | struct lttng_metadata_stream *stream = filp->private_data; |
| 1027 | struct lib_ring_buffer *buf = stream->priv; |
| 1028 | struct channel *chan = buf->backend.chan; |
| 1029 | |
| 1030 | ret = lttng_metadata_output_channel(stream, chan, &coherent); |
| 1031 | if (ret > 0) { |
| 1032 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); |
| 1033 | ret = 0; |
| 1034 | } else if (ret < 0) { |
| 1035 | goto err; |
| 1036 | } |
| 1037 | break; |
| 1038 | } |
| 1039 | default: |
| 1040 | break; |
| 1041 | } |
| 1042 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
| 1043 | |
| 1044 | /* Performing lib ring buffer ioctl after our own. */ |
| 1045 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
| 1046 | if (ret < 0) |
| 1047 | goto err; |
| 1048 | |
| 1049 | switch (cmd) { |
| 1050 | case RING_BUFFER_PUT_NEXT_SUBBUF: |
| 1051 | { |
| 1052 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, |
| 1053 | cmd, arg); |
| 1054 | break; |
| 1055 | } |
| 1056 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
| 1057 | { |
| 1058 | return put_u32(coherent, arg); |
| 1059 | } |
| 1060 | default: |
| 1061 | break; |
| 1062 | } |
| 1063 | err: |
| 1064 | return ret; |
| 1065 | } |
| 1066 | #endif |
| 1067 | |
| 1068 | /* |
| 1069 | * This is not used by anonymous file descriptors. This code is left |
| 1070 | * there if we ever want to implement an inode with open() operation. |
| 1071 | */ |
| 1072 | static |
| 1073 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) |
| 1074 | { |
| 1075 | struct lttng_metadata_stream *stream = inode->i_private; |
| 1076 | struct lib_ring_buffer *buf = stream->priv; |
| 1077 | |
| 1078 | file->private_data = buf; |
| 1079 | /* |
| 1080 | * Since life-time of metadata cache differs from that of |
| 1081 | * session, we need to keep our own reference on the transport. |
| 1082 | */ |
| 1083 | if (!try_module_get(stream->transport->owner)) { |
| 1084 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); |
| 1085 | return -EBUSY; |
| 1086 | } |
| 1087 | return lib_ring_buffer_open(inode, file, buf); |
| 1088 | } |
| 1089 | |
| 1090 | static |
| 1091 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) |
| 1092 | { |
| 1093 | struct lttng_metadata_stream *stream = file->private_data; |
| 1094 | struct lib_ring_buffer *buf = stream->priv; |
| 1095 | |
| 1096 | mutex_lock(&stream->metadata_cache->lock); |
| 1097 | list_del(&stream->list); |
| 1098 | mutex_unlock(&stream->metadata_cache->lock); |
| 1099 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
| 1100 | module_put(stream->transport->owner); |
| 1101 | kfree(stream); |
| 1102 | return lib_ring_buffer_release(inode, file, buf); |
| 1103 | } |
| 1104 | |
| 1105 | static |
| 1106 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, |
| 1107 | struct pipe_inode_info *pipe, size_t len, |
| 1108 | unsigned int flags) |
| 1109 | { |
| 1110 | struct lttng_metadata_stream *stream = in->private_data; |
| 1111 | struct lib_ring_buffer *buf = stream->priv; |
| 1112 | |
| 1113 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, |
| 1114 | flags, buf); |
| 1115 | } |
| 1116 | |
| 1117 | static |
| 1118 | int lttng_metadata_ring_buffer_mmap(struct file *filp, |
| 1119 | struct vm_area_struct *vma) |
| 1120 | { |
| 1121 | struct lttng_metadata_stream *stream = filp->private_data; |
| 1122 | struct lib_ring_buffer *buf = stream->priv; |
| 1123 | |
| 1124 | return lib_ring_buffer_mmap(filp, vma, buf); |
| 1125 | } |
| 1126 | |
| 1127 | static |
| 1128 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { |
| 1129 | .owner = THIS_MODULE, |
| 1130 | .open = lttng_metadata_ring_buffer_open, |
| 1131 | .release = lttng_metadata_ring_buffer_release, |
| 1132 | .poll = lttng_metadata_ring_buffer_poll, |
| 1133 | .splice_read = lttng_metadata_ring_buffer_splice_read, |
| 1134 | .mmap = lttng_metadata_ring_buffer_mmap, |
| 1135 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, |
| 1136 | .llseek = vfs_lib_ring_buffer_no_llseek, |
| 1137 | #ifdef CONFIG_COMPAT |
| 1138 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, |
| 1139 | #endif |
| 1140 | }; |
| 1141 | |
| 1142 | static |
| 1143 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, |
| 1144 | const struct file_operations *fops) |
| 1145 | { |
| 1146 | int stream_fd, ret; |
| 1147 | struct file *stream_file; |
| 1148 | |
| 1149 | stream_fd = lttng_get_unused_fd(); |
| 1150 | if (stream_fd < 0) { |
| 1151 | ret = stream_fd; |
| 1152 | goto fd_error; |
| 1153 | } |
| 1154 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
| 1155 | stream_priv, O_RDWR); |
| 1156 | if (IS_ERR(stream_file)) { |
| 1157 | ret = PTR_ERR(stream_file); |
| 1158 | goto file_error; |
| 1159 | } |
| 1160 | /* |
| 1161 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor |
| 1162 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this |
| 1163 | * file descriptor, so we set FMODE_PREAD here. |
| 1164 | */ |
| 1165 | stream_file->f_mode |= FMODE_PREAD; |
| 1166 | fd_install(stream_fd, stream_file); |
| 1167 | /* |
| 1168 | * The stream holds a reference to the channel within the generic ring |
| 1169 | * buffer library, so no need to hold a refcount on the channel and |
| 1170 | * session files here. |
| 1171 | */ |
| 1172 | return stream_fd; |
| 1173 | |
| 1174 | file_error: |
| 1175 | put_unused_fd(stream_fd); |
| 1176 | fd_error: |
| 1177 | return ret; |
| 1178 | } |
| 1179 | |
| 1180 | static |
| 1181 | int lttng_abi_open_stream(struct file *channel_file) |
| 1182 | { |
| 1183 | struct lttng_channel *channel = channel_file->private_data; |
| 1184 | struct lib_ring_buffer *buf; |
| 1185 | int ret; |
| 1186 | void *stream_priv; |
| 1187 | |
| 1188 | buf = channel->ops->buffer_read_open(channel->chan); |
| 1189 | if (!buf) |
| 1190 | return -ENOENT; |
| 1191 | |
| 1192 | stream_priv = buf; |
| 1193 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
| 1194 | <tng_stream_ring_buffer_file_operations); |
| 1195 | if (ret < 0) |
| 1196 | goto fd_error; |
| 1197 | |
| 1198 | return ret; |
| 1199 | |
| 1200 | fd_error: |
| 1201 | channel->ops->buffer_read_close(buf); |
| 1202 | return ret; |
| 1203 | } |
| 1204 | |
| 1205 | static |
| 1206 | int lttng_abi_open_metadata_stream(struct file *channel_file) |
| 1207 | { |
| 1208 | struct lttng_channel *channel = channel_file->private_data; |
| 1209 | struct lttng_session *session = channel->session; |
| 1210 | struct lib_ring_buffer *buf; |
| 1211 | int ret; |
| 1212 | struct lttng_metadata_stream *metadata_stream; |
| 1213 | void *stream_priv; |
| 1214 | |
| 1215 | buf = channel->ops->buffer_read_open(channel->chan); |
| 1216 | if (!buf) |
| 1217 | return -ENOENT; |
| 1218 | |
| 1219 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), |
| 1220 | GFP_KERNEL); |
| 1221 | if (!metadata_stream) { |
| 1222 | ret = -ENOMEM; |
| 1223 | goto nomem; |
| 1224 | } |
| 1225 | metadata_stream->metadata_cache = session->metadata_cache; |
| 1226 | init_waitqueue_head(&metadata_stream->read_wait); |
| 1227 | metadata_stream->priv = buf; |
| 1228 | stream_priv = metadata_stream; |
| 1229 | metadata_stream->transport = channel->transport; |
| 1230 | /* Initial state is an empty metadata, considered as incoherent. */ |
| 1231 | metadata_stream->coherent = false; |
| 1232 | |
| 1233 | /* |
| 1234 | * Since life-time of metadata cache differs from that of |
| 1235 | * session, we need to keep our own reference on the transport. |
| 1236 | */ |
| 1237 | if (!try_module_get(metadata_stream->transport->owner)) { |
| 1238 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); |
| 1239 | ret = -EINVAL; |
| 1240 | goto notransport; |
| 1241 | } |
| 1242 | |
| 1243 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
| 1244 | ret = -EOVERFLOW; |
| 1245 | goto kref_error; |
| 1246 | } |
| 1247 | |
| 1248 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
| 1249 | <tng_metadata_ring_buffer_file_operations); |
| 1250 | if (ret < 0) |
| 1251 | goto fd_error; |
| 1252 | |
| 1253 | mutex_lock(&session->metadata_cache->lock); |
| 1254 | list_add(&metadata_stream->list, |
| 1255 | &session->metadata_cache->metadata_stream); |
| 1256 | mutex_unlock(&session->metadata_cache->lock); |
| 1257 | return ret; |
| 1258 | |
| 1259 | fd_error: |
| 1260 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
| 1261 | kref_error: |
| 1262 | module_put(metadata_stream->transport->owner); |
| 1263 | notransport: |
| 1264 | kfree(metadata_stream); |
| 1265 | nomem: |
| 1266 | channel->ops->buffer_read_close(buf); |
| 1267 | return ret; |
| 1268 | } |
| 1269 | |
| 1270 | static |
| 1271 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) |
| 1272 | { |
| 1273 | /* Limit ABI to implemented features. */ |
| 1274 | switch (event_param->instrumentation) { |
| 1275 | case LTTNG_KERNEL_SYSCALL: |
| 1276 | switch (event_param->u.syscall.entryexit) { |
| 1277 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: |
| 1278 | break; |
| 1279 | default: |
| 1280 | return -EINVAL; |
| 1281 | } |
| 1282 | switch (event_param->u.syscall.abi) { |
| 1283 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: |
| 1284 | break; |
| 1285 | default: |
| 1286 | return -EINVAL; |
| 1287 | } |
| 1288 | switch (event_param->u.syscall.match) { |
| 1289 | case LTTNG_SYSCALL_MATCH_NAME: |
| 1290 | break; |
| 1291 | default: |
| 1292 | return -EINVAL; |
| 1293 | } |
| 1294 | break; |
| 1295 | |
| 1296 | case LTTNG_KERNEL_TRACEPOINT: |
| 1297 | lttng_fallthrough; |
| 1298 | case LTTNG_KERNEL_KPROBE: |
| 1299 | lttng_fallthrough; |
| 1300 | case LTTNG_KERNEL_KRETPROBE: |
| 1301 | lttng_fallthrough; |
| 1302 | case LTTNG_KERNEL_NOOP: |
| 1303 | lttng_fallthrough; |
| 1304 | case LTTNG_KERNEL_UPROBE: |
| 1305 | break; |
| 1306 | |
| 1307 | case LTTNG_KERNEL_FUNCTION: |
| 1308 | lttng_fallthrough; |
| 1309 | default: |
| 1310 | return -EINVAL; |
| 1311 | } |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | static |
| 1316 | int lttng_abi_create_event(struct file *channel_file, |
| 1317 | struct lttng_kernel_event *event_param) |
| 1318 | { |
| 1319 | struct lttng_channel *channel = channel_file->private_data; |
| 1320 | int event_fd, ret; |
| 1321 | struct file *event_file; |
| 1322 | void *priv; |
| 1323 | |
| 1324 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 1325 | switch (event_param->instrumentation) { |
| 1326 | case LTTNG_KERNEL_KRETPROBE: |
| 1327 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 1328 | break; |
| 1329 | case LTTNG_KERNEL_KPROBE: |
| 1330 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 1331 | break; |
| 1332 | case LTTNG_KERNEL_FUNCTION: |
| 1333 | WARN_ON_ONCE(1); |
| 1334 | /* Not implemented. */ |
| 1335 | break; |
| 1336 | default: |
| 1337 | break; |
| 1338 | } |
| 1339 | event_fd = lttng_get_unused_fd(); |
| 1340 | if (event_fd < 0) { |
| 1341 | ret = event_fd; |
| 1342 | goto fd_error; |
| 1343 | } |
| 1344 | event_file = anon_inode_getfile("[lttng_event]", |
| 1345 | <tng_event_fops, |
| 1346 | NULL, O_RDWR); |
| 1347 | if (IS_ERR(event_file)) { |
| 1348 | ret = PTR_ERR(event_file); |
| 1349 | goto file_error; |
| 1350 | } |
| 1351 | /* The event holds a reference on the channel */ |
| 1352 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
| 1353 | ret = -EOVERFLOW; |
| 1354 | goto refcount_error; |
| 1355 | } |
| 1356 | ret = lttng_abi_validate_event_param(event_param); |
| 1357 | if (ret) |
| 1358 | goto event_error; |
| 1359 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
| 1360 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { |
| 1361 | struct lttng_enabler *enabler; |
| 1362 | |
| 1363 | if (strutils_is_star_glob_pattern(event_param->name)) { |
| 1364 | /* |
| 1365 | * If the event name is a star globbing pattern, |
| 1366 | * we create the special star globbing enabler. |
| 1367 | */ |
| 1368 | enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB, |
| 1369 | event_param, channel); |
| 1370 | } else { |
| 1371 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
| 1372 | event_param, channel); |
| 1373 | } |
| 1374 | priv = enabler; |
| 1375 | } else { |
| 1376 | struct lttng_event *event; |
| 1377 | |
| 1378 | /* |
| 1379 | * We tolerate no failure path after event creation. It |
| 1380 | * will stay invariant for the rest of the session. |
| 1381 | */ |
| 1382 | event = lttng_event_create(channel, event_param, |
| 1383 | NULL, NULL, |
| 1384 | event_param->instrumentation); |
| 1385 | WARN_ON_ONCE(!event); |
| 1386 | if (IS_ERR(event)) { |
| 1387 | ret = PTR_ERR(event); |
| 1388 | goto event_error; |
| 1389 | } |
| 1390 | priv = event; |
| 1391 | } |
| 1392 | event_file->private_data = priv; |
| 1393 | fd_install(event_fd, event_file); |
| 1394 | return event_fd; |
| 1395 | |
| 1396 | event_error: |
| 1397 | atomic_long_dec(&channel_file->f_count); |
| 1398 | refcount_error: |
| 1399 | fput(event_file); |
| 1400 | file_error: |
| 1401 | put_unused_fd(event_fd); |
| 1402 | fd_error: |
| 1403 | return ret; |
| 1404 | } |
| 1405 | |
| 1406 | /** |
| 1407 | * lttng_channel_ioctl - lttng syscall through ioctl |
| 1408 | * |
| 1409 | * @file: the file |
| 1410 | * @cmd: the command |
| 1411 | * @arg: command arg |
| 1412 | * |
| 1413 | * This ioctl implements lttng commands: |
| 1414 | * LTTNG_KERNEL_STREAM |
| 1415 | * Returns an event stream file descriptor or failure. |
| 1416 | * (typically, one event stream records events from one CPU) |
| 1417 | * LTTNG_KERNEL_EVENT |
| 1418 | * Returns an event file descriptor or failure. |
| 1419 | * LTTNG_KERNEL_CONTEXT |
| 1420 | * Prepend a context field to each event in the channel |
| 1421 | * LTTNG_KERNEL_ENABLE |
| 1422 | * Enable recording for events in this channel (weak enable) |
| 1423 | * LTTNG_KERNEL_DISABLE |
| 1424 | * Disable recording for events in this channel (strong disable) |
| 1425 | * |
| 1426 | * Channel and event file descriptors also hold a reference on the session. |
| 1427 | */ |
| 1428 | static |
| 1429 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1430 | { |
| 1431 | struct lttng_channel *channel = file->private_data; |
| 1432 | |
| 1433 | switch (cmd) { |
| 1434 | case LTTNG_KERNEL_OLD_STREAM: |
| 1435 | case LTTNG_KERNEL_STREAM: |
| 1436 | return lttng_abi_open_stream(file); |
| 1437 | case LTTNG_KERNEL_OLD_EVENT: |
| 1438 | { |
| 1439 | struct lttng_kernel_event *uevent_param; |
| 1440 | struct lttng_kernel_old_event *old_uevent_param; |
| 1441 | int ret; |
| 1442 | |
| 1443 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), |
| 1444 | GFP_KERNEL); |
| 1445 | if (!uevent_param) { |
| 1446 | ret = -ENOMEM; |
| 1447 | goto old_event_end; |
| 1448 | } |
| 1449 | old_uevent_param = kmalloc( |
| 1450 | sizeof(struct lttng_kernel_old_event), |
| 1451 | GFP_KERNEL); |
| 1452 | if (!old_uevent_param) { |
| 1453 | ret = -ENOMEM; |
| 1454 | goto old_event_error_free_param; |
| 1455 | } |
| 1456 | if (copy_from_user(old_uevent_param, |
| 1457 | (struct lttng_kernel_old_event __user *) arg, |
| 1458 | sizeof(struct lttng_kernel_old_event))) { |
| 1459 | ret = -EFAULT; |
| 1460 | goto old_event_error_free_old_param; |
| 1461 | } |
| 1462 | |
| 1463 | memcpy(uevent_param->name, old_uevent_param->name, |
| 1464 | sizeof(uevent_param->name)); |
| 1465 | uevent_param->instrumentation = |
| 1466 | old_uevent_param->instrumentation; |
| 1467 | |
| 1468 | switch (old_uevent_param->instrumentation) { |
| 1469 | case LTTNG_KERNEL_KPROBE: |
| 1470 | uevent_param->u.kprobe.addr = |
| 1471 | old_uevent_param->u.kprobe.addr; |
| 1472 | uevent_param->u.kprobe.offset = |
| 1473 | old_uevent_param->u.kprobe.offset; |
| 1474 | memcpy(uevent_param->u.kprobe.symbol_name, |
| 1475 | old_uevent_param->u.kprobe.symbol_name, |
| 1476 | sizeof(uevent_param->u.kprobe.symbol_name)); |
| 1477 | break; |
| 1478 | case LTTNG_KERNEL_KRETPROBE: |
| 1479 | uevent_param->u.kretprobe.addr = |
| 1480 | old_uevent_param->u.kretprobe.addr; |
| 1481 | uevent_param->u.kretprobe.offset = |
| 1482 | old_uevent_param->u.kretprobe.offset; |
| 1483 | memcpy(uevent_param->u.kretprobe.symbol_name, |
| 1484 | old_uevent_param->u.kretprobe.symbol_name, |
| 1485 | sizeof(uevent_param->u.kretprobe.symbol_name)); |
| 1486 | break; |
| 1487 | case LTTNG_KERNEL_FUNCTION: |
| 1488 | WARN_ON_ONCE(1); |
| 1489 | /* Not implemented. */ |
| 1490 | break; |
| 1491 | default: |
| 1492 | break; |
| 1493 | } |
| 1494 | ret = lttng_abi_create_event(file, uevent_param); |
| 1495 | |
| 1496 | old_event_error_free_old_param: |
| 1497 | kfree(old_uevent_param); |
| 1498 | old_event_error_free_param: |
| 1499 | kfree(uevent_param); |
| 1500 | old_event_end: |
| 1501 | return ret; |
| 1502 | } |
| 1503 | case LTTNG_KERNEL_EVENT: |
| 1504 | { |
| 1505 | struct lttng_kernel_event uevent_param; |
| 1506 | |
| 1507 | if (copy_from_user(&uevent_param, |
| 1508 | (struct lttng_kernel_event __user *) arg, |
| 1509 | sizeof(uevent_param))) |
| 1510 | return -EFAULT; |
| 1511 | return lttng_abi_create_event(file, &uevent_param); |
| 1512 | } |
| 1513 | case LTTNG_KERNEL_OLD_CONTEXT: |
| 1514 | { |
| 1515 | struct lttng_kernel_context *ucontext_param; |
| 1516 | struct lttng_kernel_old_context *old_ucontext_param; |
| 1517 | int ret; |
| 1518 | |
| 1519 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), |
| 1520 | GFP_KERNEL); |
| 1521 | if (!ucontext_param) { |
| 1522 | ret = -ENOMEM; |
| 1523 | goto old_ctx_end; |
| 1524 | } |
| 1525 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), |
| 1526 | GFP_KERNEL); |
| 1527 | if (!old_ucontext_param) { |
| 1528 | ret = -ENOMEM; |
| 1529 | goto old_ctx_error_free_param; |
| 1530 | } |
| 1531 | |
| 1532 | if (copy_from_user(old_ucontext_param, |
| 1533 | (struct lttng_kernel_old_context __user *) arg, |
| 1534 | sizeof(struct lttng_kernel_old_context))) { |
| 1535 | ret = -EFAULT; |
| 1536 | goto old_ctx_error_free_old_param; |
| 1537 | } |
| 1538 | ucontext_param->ctx = old_ucontext_param->ctx; |
| 1539 | memcpy(ucontext_param->padding, old_ucontext_param->padding, |
| 1540 | sizeof(ucontext_param->padding)); |
| 1541 | /* only type that uses the union */ |
| 1542 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { |
| 1543 | ucontext_param->u.perf_counter.type = |
| 1544 | old_ucontext_param->u.perf_counter.type; |
| 1545 | ucontext_param->u.perf_counter.config = |
| 1546 | old_ucontext_param->u.perf_counter.config; |
| 1547 | memcpy(ucontext_param->u.perf_counter.name, |
| 1548 | old_ucontext_param->u.perf_counter.name, |
| 1549 | sizeof(ucontext_param->u.perf_counter.name)); |
| 1550 | } |
| 1551 | |
| 1552 | ret = lttng_abi_add_context(file, |
| 1553 | ucontext_param, |
| 1554 | &channel->ctx, channel->session); |
| 1555 | |
| 1556 | old_ctx_error_free_old_param: |
| 1557 | kfree(old_ucontext_param); |
| 1558 | old_ctx_error_free_param: |
| 1559 | kfree(ucontext_param); |
| 1560 | old_ctx_end: |
| 1561 | return ret; |
| 1562 | } |
| 1563 | case LTTNG_KERNEL_CONTEXT: |
| 1564 | { |
| 1565 | struct lttng_kernel_context ucontext_param; |
| 1566 | |
| 1567 | if (copy_from_user(&ucontext_param, |
| 1568 | (struct lttng_kernel_context __user *) arg, |
| 1569 | sizeof(ucontext_param))) |
| 1570 | return -EFAULT; |
| 1571 | return lttng_abi_add_context(file, |
| 1572 | &ucontext_param, |
| 1573 | &channel->ctx, channel->session); |
| 1574 | } |
| 1575 | case LTTNG_KERNEL_OLD_ENABLE: |
| 1576 | case LTTNG_KERNEL_ENABLE: |
| 1577 | return lttng_channel_enable(channel); |
| 1578 | case LTTNG_KERNEL_OLD_DISABLE: |
| 1579 | case LTTNG_KERNEL_DISABLE: |
| 1580 | return lttng_channel_disable(channel); |
| 1581 | case LTTNG_KERNEL_SYSCALL_MASK: |
| 1582 | return lttng_channel_syscall_mask(channel, |
| 1583 | (struct lttng_kernel_syscall_mask __user *) arg); |
| 1584 | default: |
| 1585 | return -ENOIOCTLCMD; |
| 1586 | } |
| 1587 | } |
| 1588 | |
| 1589 | /** |
| 1590 | * lttng_metadata_ioctl - lttng syscall through ioctl |
| 1591 | * |
| 1592 | * @file: the file |
| 1593 | * @cmd: the command |
| 1594 | * @arg: command arg |
| 1595 | * |
| 1596 | * This ioctl implements lttng commands: |
| 1597 | * LTTNG_KERNEL_STREAM |
| 1598 | * Returns an event stream file descriptor or failure. |
| 1599 | * |
| 1600 | * Channel and event file descriptors also hold a reference on the session. |
| 1601 | */ |
| 1602 | static |
| 1603 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1604 | { |
| 1605 | switch (cmd) { |
| 1606 | case LTTNG_KERNEL_OLD_STREAM: |
| 1607 | case LTTNG_KERNEL_STREAM: |
| 1608 | return lttng_abi_open_metadata_stream(file); |
| 1609 | default: |
| 1610 | return -ENOIOCTLCMD; |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | /** |
| 1615 | * lttng_channel_poll - lttng stream addition/removal monitoring |
| 1616 | * |
| 1617 | * @file: the file |
| 1618 | * @wait: poll table |
| 1619 | */ |
| 1620 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
| 1621 | { |
| 1622 | struct lttng_channel *channel = file->private_data; |
| 1623 | unsigned int mask = 0; |
| 1624 | |
| 1625 | if (file->f_mode & FMODE_READ) { |
| 1626 | poll_wait_set_exclusive(wait); |
| 1627 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
| 1628 | wait); |
| 1629 | |
| 1630 | if (channel->ops->is_disabled(channel->chan)) |
| 1631 | return POLLERR; |
| 1632 | if (channel->ops->is_finalized(channel->chan)) |
| 1633 | return POLLHUP; |
| 1634 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
| 1635 | return POLLIN | POLLRDNORM; |
| 1636 | return 0; |
| 1637 | } |
| 1638 | return mask; |
| 1639 | |
| 1640 | } |
| 1641 | |
| 1642 | static |
| 1643 | int lttng_channel_release(struct inode *inode, struct file *file) |
| 1644 | { |
| 1645 | struct lttng_channel *channel = file->private_data; |
| 1646 | |
| 1647 | if (channel) |
| 1648 | fput(channel->session->file); |
| 1649 | return 0; |
| 1650 | } |
| 1651 | |
| 1652 | static |
| 1653 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) |
| 1654 | { |
| 1655 | struct lttng_channel *channel = file->private_data; |
| 1656 | |
| 1657 | if (channel) { |
| 1658 | fput(channel->session->file); |
| 1659 | lttng_metadata_channel_destroy(channel); |
| 1660 | } |
| 1661 | |
| 1662 | return 0; |
| 1663 | } |
| 1664 | |
| 1665 | static const struct file_operations lttng_channel_fops = { |
| 1666 | .owner = THIS_MODULE, |
| 1667 | .release = lttng_channel_release, |
| 1668 | .poll = lttng_channel_poll, |
| 1669 | .unlocked_ioctl = lttng_channel_ioctl, |
| 1670 | #ifdef CONFIG_COMPAT |
| 1671 | .compat_ioctl = lttng_channel_ioctl, |
| 1672 | #endif |
| 1673 | }; |
| 1674 | |
| 1675 | static const struct file_operations lttng_metadata_fops = { |
| 1676 | .owner = THIS_MODULE, |
| 1677 | .release = lttng_metadata_channel_release, |
| 1678 | .unlocked_ioctl = lttng_metadata_ioctl, |
| 1679 | #ifdef CONFIG_COMPAT |
| 1680 | .compat_ioctl = lttng_metadata_ioctl, |
| 1681 | #endif |
| 1682 | }; |
| 1683 | |
| 1684 | /** |
| 1685 | * lttng_event_ioctl - lttng syscall through ioctl |
| 1686 | * |
| 1687 | * @file: the file |
| 1688 | * @cmd: the command |
| 1689 | * @arg: command arg |
| 1690 | * |
| 1691 | * This ioctl implements lttng commands: |
| 1692 | * LTTNG_KERNEL_CONTEXT |
| 1693 | * Prepend a context field to each record of this event |
| 1694 | * LTTNG_KERNEL_ENABLE |
| 1695 | * Enable recording for this event (weak enable) |
| 1696 | * LTTNG_KERNEL_DISABLE |
| 1697 | * Disable recording for this event (strong disable) |
| 1698 | */ |
| 1699 | static |
| 1700 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1701 | { |
| 1702 | struct lttng_event *event; |
| 1703 | struct lttng_enabler *enabler; |
| 1704 | enum lttng_event_type *evtype = file->private_data; |
| 1705 | |
| 1706 | switch (cmd) { |
| 1707 | case LTTNG_KERNEL_OLD_CONTEXT: |
| 1708 | { |
| 1709 | /* Not implemented */ |
| 1710 | return -ENOSYS; |
| 1711 | } |
| 1712 | case LTTNG_KERNEL_CONTEXT: |
| 1713 | { |
| 1714 | /* Not implemented */ |
| 1715 | return -ENOSYS; |
| 1716 | } |
| 1717 | case LTTNG_KERNEL_OLD_ENABLE: |
| 1718 | case LTTNG_KERNEL_ENABLE: |
| 1719 | switch (*evtype) { |
| 1720 | case LTTNG_TYPE_EVENT: |
| 1721 | event = file->private_data; |
| 1722 | return lttng_event_enable(event); |
| 1723 | case LTTNG_TYPE_ENABLER: |
| 1724 | enabler = file->private_data; |
| 1725 | return lttng_enabler_enable(enabler); |
| 1726 | default: |
| 1727 | WARN_ON_ONCE(1); |
| 1728 | return -ENOSYS; |
| 1729 | } |
| 1730 | case LTTNG_KERNEL_OLD_DISABLE: |
| 1731 | case LTTNG_KERNEL_DISABLE: |
| 1732 | switch (*evtype) { |
| 1733 | case LTTNG_TYPE_EVENT: |
| 1734 | event = file->private_data; |
| 1735 | return lttng_event_disable(event); |
| 1736 | case LTTNG_TYPE_ENABLER: |
| 1737 | enabler = file->private_data; |
| 1738 | return lttng_enabler_disable(enabler); |
| 1739 | default: |
| 1740 | WARN_ON_ONCE(1); |
| 1741 | return -ENOSYS; |
| 1742 | } |
| 1743 | case LTTNG_KERNEL_FILTER: |
| 1744 | switch (*evtype) { |
| 1745 | case LTTNG_TYPE_EVENT: |
| 1746 | return -EINVAL; |
| 1747 | case LTTNG_TYPE_ENABLER: |
| 1748 | { |
| 1749 | enabler = file->private_data; |
| 1750 | return lttng_enabler_attach_bytecode(enabler, |
| 1751 | (struct lttng_kernel_filter_bytecode __user *) arg); |
| 1752 | } |
| 1753 | default: |
| 1754 | WARN_ON_ONCE(1); |
| 1755 | return -ENOSYS; |
| 1756 | } |
| 1757 | case LTTNG_KERNEL_ADD_CALLSITE: |
| 1758 | switch (*evtype) { |
| 1759 | case LTTNG_TYPE_EVENT: |
| 1760 | event = file->private_data; |
| 1761 | return lttng_event_add_callsite(event, |
| 1762 | (struct lttng_kernel_event_callsite __user *) arg); |
| 1763 | case LTTNG_TYPE_ENABLER: |
| 1764 | return -EINVAL; |
| 1765 | default: |
| 1766 | WARN_ON_ONCE(1); |
| 1767 | return -ENOSYS; |
| 1768 | } |
| 1769 | default: |
| 1770 | return -ENOIOCTLCMD; |
| 1771 | } |
| 1772 | } |
| 1773 | |
| 1774 | static |
| 1775 | int lttng_event_release(struct inode *inode, struct file *file) |
| 1776 | { |
| 1777 | struct lttng_event *event; |
| 1778 | struct lttng_enabler *enabler; |
| 1779 | enum lttng_event_type *evtype = file->private_data; |
| 1780 | |
| 1781 | if (!evtype) |
| 1782 | return 0; |
| 1783 | |
| 1784 | switch (*evtype) { |
| 1785 | case LTTNG_TYPE_EVENT: |
| 1786 | event = file->private_data; |
| 1787 | if (event) |
| 1788 | fput(event->chan->file); |
| 1789 | break; |
| 1790 | case LTTNG_TYPE_ENABLER: |
| 1791 | enabler = file->private_data; |
| 1792 | if (enabler) |
| 1793 | fput(enabler->chan->file); |
| 1794 | break; |
| 1795 | default: |
| 1796 | WARN_ON_ONCE(1); |
| 1797 | break; |
| 1798 | } |
| 1799 | |
| 1800 | return 0; |
| 1801 | } |
| 1802 | |
| 1803 | /* TODO: filter control ioctl */ |
| 1804 | static const struct file_operations lttng_event_fops = { |
| 1805 | .owner = THIS_MODULE, |
| 1806 | .release = lttng_event_release, |
| 1807 | .unlocked_ioctl = lttng_event_ioctl, |
| 1808 | #ifdef CONFIG_COMPAT |
| 1809 | .compat_ioctl = lttng_event_ioctl, |
| 1810 | #endif |
| 1811 | }; |
| 1812 | |
| 1813 | static int put_u64(uint64_t val, unsigned long arg) |
| 1814 | { |
| 1815 | return put_user(val, (uint64_t __user *) arg); |
| 1816 | } |
| 1817 | |
| 1818 | static int put_u32(uint32_t val, unsigned long arg) |
| 1819 | { |
| 1820 | return put_user(val, (uint32_t __user *) arg); |
| 1821 | } |
| 1822 | |
| 1823 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
| 1824 | unsigned int cmd, unsigned long arg) |
| 1825 | { |
| 1826 | struct lib_ring_buffer *buf = filp->private_data; |
| 1827 | struct channel *chan = buf->backend.chan; |
| 1828 | const struct lib_ring_buffer_config *config = &chan->backend.config; |
| 1829 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
| 1830 | int ret; |
| 1831 | |
| 1832 | if (atomic_read(&chan->record_disabled)) |
| 1833 | return -EIO; |
| 1834 | |
| 1835 | switch (cmd) { |
| 1836 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
| 1837 | { |
| 1838 | uint64_t ts; |
| 1839 | |
| 1840 | ret = ops->timestamp_begin(config, buf, &ts); |
| 1841 | if (ret < 0) |
| 1842 | goto error; |
| 1843 | return put_u64(ts, arg); |
| 1844 | } |
| 1845 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: |
| 1846 | { |
| 1847 | uint64_t ts; |
| 1848 | |
| 1849 | ret = ops->timestamp_end(config, buf, &ts); |
| 1850 | if (ret < 0) |
| 1851 | goto error; |
| 1852 | return put_u64(ts, arg); |
| 1853 | } |
| 1854 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: |
| 1855 | { |
| 1856 | uint64_t ed; |
| 1857 | |
| 1858 | ret = ops->events_discarded(config, buf, &ed); |
| 1859 | if (ret < 0) |
| 1860 | goto error; |
| 1861 | return put_u64(ed, arg); |
| 1862 | } |
| 1863 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: |
| 1864 | { |
| 1865 | uint64_t cs; |
| 1866 | |
| 1867 | ret = ops->content_size(config, buf, &cs); |
| 1868 | if (ret < 0) |
| 1869 | goto error; |
| 1870 | return put_u64(cs, arg); |
| 1871 | } |
| 1872 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: |
| 1873 | { |
| 1874 | uint64_t ps; |
| 1875 | |
| 1876 | ret = ops->packet_size(config, buf, &ps); |
| 1877 | if (ret < 0) |
| 1878 | goto error; |
| 1879 | return put_u64(ps, arg); |
| 1880 | } |
| 1881 | case LTTNG_RING_BUFFER_GET_STREAM_ID: |
| 1882 | { |
| 1883 | uint64_t si; |
| 1884 | |
| 1885 | ret = ops->stream_id(config, buf, &si); |
| 1886 | if (ret < 0) |
| 1887 | goto error; |
| 1888 | return put_u64(si, arg); |
| 1889 | } |
| 1890 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
| 1891 | { |
| 1892 | uint64_t ts; |
| 1893 | |
| 1894 | ret = ops->current_timestamp(config, buf, &ts); |
| 1895 | if (ret < 0) |
| 1896 | goto error; |
| 1897 | return put_u64(ts, arg); |
| 1898 | } |
| 1899 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
| 1900 | { |
| 1901 | uint64_t seq; |
| 1902 | |
| 1903 | ret = ops->sequence_number(config, buf, &seq); |
| 1904 | if (ret < 0) |
| 1905 | goto error; |
| 1906 | return put_u64(seq, arg); |
| 1907 | } |
| 1908 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
| 1909 | { |
| 1910 | uint64_t id; |
| 1911 | |
| 1912 | ret = ops->instance_id(config, buf, &id); |
| 1913 | if (ret < 0) |
| 1914 | goto error; |
| 1915 | return put_u64(id, arg); |
| 1916 | } |
| 1917 | default: |
| 1918 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, |
| 1919 | cmd, arg); |
| 1920 | } |
| 1921 | |
| 1922 | error: |
| 1923 | return -ENOSYS; |
| 1924 | } |
| 1925 | |
| 1926 | #ifdef CONFIG_COMPAT |
| 1927 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, |
| 1928 | unsigned int cmd, unsigned long arg) |
| 1929 | { |
| 1930 | struct lib_ring_buffer *buf = filp->private_data; |
| 1931 | struct channel *chan = buf->backend.chan; |
| 1932 | const struct lib_ring_buffer_config *config = &chan->backend.config; |
| 1933 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
| 1934 | int ret; |
| 1935 | |
| 1936 | if (atomic_read(&chan->record_disabled)) |
| 1937 | return -EIO; |
| 1938 | |
| 1939 | switch (cmd) { |
| 1940 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
| 1941 | { |
| 1942 | uint64_t ts; |
| 1943 | |
| 1944 | ret = ops->timestamp_begin(config, buf, &ts); |
| 1945 | if (ret < 0) |
| 1946 | goto error; |
| 1947 | return put_u64(ts, arg); |
| 1948 | } |
| 1949 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: |
| 1950 | { |
| 1951 | uint64_t ts; |
| 1952 | |
| 1953 | ret = ops->timestamp_end(config, buf, &ts); |
| 1954 | if (ret < 0) |
| 1955 | goto error; |
| 1956 | return put_u64(ts, arg); |
| 1957 | } |
| 1958 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: |
| 1959 | { |
| 1960 | uint64_t ed; |
| 1961 | |
| 1962 | ret = ops->events_discarded(config, buf, &ed); |
| 1963 | if (ret < 0) |
| 1964 | goto error; |
| 1965 | return put_u64(ed, arg); |
| 1966 | } |
| 1967 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
| 1968 | { |
| 1969 | uint64_t cs; |
| 1970 | |
| 1971 | ret = ops->content_size(config, buf, &cs); |
| 1972 | if (ret < 0) |
| 1973 | goto error; |
| 1974 | return put_u64(cs, arg); |
| 1975 | } |
| 1976 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: |
| 1977 | { |
| 1978 | uint64_t ps; |
| 1979 | |
| 1980 | ret = ops->packet_size(config, buf, &ps); |
| 1981 | if (ret < 0) |
| 1982 | goto error; |
| 1983 | return put_u64(ps, arg); |
| 1984 | } |
| 1985 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: |
| 1986 | { |
| 1987 | uint64_t si; |
| 1988 | |
| 1989 | ret = ops->stream_id(config, buf, &si); |
| 1990 | if (ret < 0) |
| 1991 | goto error; |
| 1992 | return put_u64(si, arg); |
| 1993 | } |
| 1994 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
| 1995 | { |
| 1996 | uint64_t ts; |
| 1997 | |
| 1998 | ret = ops->current_timestamp(config, buf, &ts); |
| 1999 | if (ret < 0) |
| 2000 | goto error; |
| 2001 | return put_u64(ts, arg); |
| 2002 | } |
| 2003 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
| 2004 | { |
| 2005 | uint64_t seq; |
| 2006 | |
| 2007 | ret = ops->sequence_number(config, buf, &seq); |
| 2008 | if (ret < 0) |
| 2009 | goto error; |
| 2010 | return put_u64(seq, arg); |
| 2011 | } |
| 2012 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
| 2013 | { |
| 2014 | uint64_t id; |
| 2015 | |
| 2016 | ret = ops->instance_id(config, buf, &id); |
| 2017 | if (ret < 0) |
| 2018 | goto error; |
| 2019 | return put_u64(id, arg); |
| 2020 | } |
| 2021 | default: |
| 2022 | return lib_ring_buffer_file_operations.compat_ioctl(filp, |
| 2023 | cmd, arg); |
| 2024 | } |
| 2025 | |
| 2026 | error: |
| 2027 | return -ENOSYS; |
| 2028 | } |
| 2029 | #endif /* CONFIG_COMPAT */ |
| 2030 | |
| 2031 | static void lttng_stream_override_ring_buffer_fops(void) |
| 2032 | { |
| 2033 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; |
| 2034 | lttng_stream_ring_buffer_file_operations.open = |
| 2035 | lib_ring_buffer_file_operations.open; |
| 2036 | lttng_stream_ring_buffer_file_operations.release = |
| 2037 | lib_ring_buffer_file_operations.release; |
| 2038 | lttng_stream_ring_buffer_file_operations.poll = |
| 2039 | lib_ring_buffer_file_operations.poll; |
| 2040 | lttng_stream_ring_buffer_file_operations.splice_read = |
| 2041 | lib_ring_buffer_file_operations.splice_read; |
| 2042 | lttng_stream_ring_buffer_file_operations.mmap = |
| 2043 | lib_ring_buffer_file_operations.mmap; |
| 2044 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = |
| 2045 | lttng_stream_ring_buffer_ioctl; |
| 2046 | lttng_stream_ring_buffer_file_operations.llseek = |
| 2047 | lib_ring_buffer_file_operations.llseek; |
| 2048 | #ifdef CONFIG_COMPAT |
| 2049 | lttng_stream_ring_buffer_file_operations.compat_ioctl = |
| 2050 | lttng_stream_ring_buffer_compat_ioctl; |
| 2051 | #endif |
| 2052 | } |
| 2053 | |
| 2054 | int __init lttng_abi_init(void) |
| 2055 | { |
| 2056 | int ret = 0; |
| 2057 | |
| 2058 | wrapper_vmalloc_sync_mappings(); |
| 2059 | lttng_clock_ref(); |
| 2060 | |
| 2061 | ret = lttng_tp_mempool_init(); |
| 2062 | if (ret) { |
| 2063 | goto error; |
| 2064 | } |
| 2065 | |
| 2066 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
| 2067 | <tng_proc_ops, NULL); |
| 2068 | |
| 2069 | if (!lttng_proc_dentry) { |
| 2070 | printk(KERN_ERR "Error creating LTTng control file\n"); |
| 2071 | ret = -ENOMEM; |
| 2072 | goto error; |
| 2073 | } |
| 2074 | lttng_stream_override_ring_buffer_fops(); |
| 2075 | return 0; |
| 2076 | |
| 2077 | error: |
| 2078 | lttng_tp_mempool_destroy(); |
| 2079 | lttng_clock_unref(); |
| 2080 | return ret; |
| 2081 | } |
| 2082 | |
| 2083 | /* No __exit annotation because used by init error path too. */ |
| 2084 | void lttng_abi_exit(void) |
| 2085 | { |
| 2086 | lttng_tp_mempool_destroy(); |
| 2087 | lttng_clock_unref(); |
| 2088 | if (lttng_proc_dentry) |
| 2089 | remove_proc_entry("lttng", NULL); |
| 2090 | } |