| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-only |
| 3 | * |
| 4 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 5 | * |
| 6 | * LTTng UST ABI |
| 7 | * |
| 8 | * Mimic system calls for: |
| 9 | * - session creation, returns an object descriptor or failure. |
| 10 | * - channel creation, returns an object descriptor or failure. |
| 11 | * - Operates on a session object descriptor |
| 12 | * - Takes all channel options as parameters. |
| 13 | * - stream get, returns an object descriptor or failure. |
| 14 | * - Operates on a channel object descriptor. |
| 15 | * - stream notifier get, returns an object descriptor or failure. |
| 16 | * - Operates on a channel object descriptor. |
| 17 | * - event creation, returns an object descriptor or failure. |
| 18 | * - Operates on a channel object descriptor |
| 19 | * - Takes an event name as parameter |
| 20 | * - Takes an instrumentation source as parameter |
| 21 | * - e.g. tracepoints, dynamic_probes... |
| 22 | * - Takes instrumentation source specific arguments. |
| 23 | */ |
| 24 | |
| 25 | #define _LGPL_SOURCE |
| 26 | #include <fcntl.h> |
| 27 | #include <stdint.h> |
| 28 | #include <unistd.h> |
| 29 | |
| 30 | #include <urcu/compiler.h> |
| 31 | #include <urcu/list.h> |
| 32 | |
| 33 | #include <lttng/tracepoint.h> |
| 34 | #include <lttng/ust-abi.h> |
| 35 | #include <lttng/ust-error.h> |
| 36 | #include <lttng/ust-events.h> |
| 37 | #include <lttng/ust-version.h> |
| 38 | |
| 39 | #include "common/ust-fd.h" |
| 40 | #include "common/logging.h" |
| 41 | #include "common/align.h" |
| 42 | |
| 43 | #include "common/ringbuffer/frontend_types.h" |
| 44 | #include "common/ringbuffer/frontend.h" |
| 45 | #include "common/ringbuffer/shm.h" |
| 46 | #include "common/counter/counter.h" |
| 47 | #include "common/tracepoint.h" |
| 48 | #include "common/tracer.h" |
| 49 | #include "common/strutils.h" |
| 50 | #include "lib/lttng-ust/events.h" |
| 51 | #include "lib/lttng-ust/lttng-tracer-core.h" |
| 52 | #include "context-internal.h" |
| 53 | #include "common/macros.h" |
| 54 | |
| 55 | #define OBJ_NAME_LEN 16 |
| 56 | |
| 57 | static int lttng_ust_abi_close_in_progress; |
| 58 | |
| 59 | static |
| 60 | int lttng_abi_tracepoint_list(void *owner); |
| 61 | static |
| 62 | int lttng_abi_tracepoint_field_list(void *owner); |
| 63 | |
| 64 | /* |
| 65 | * Object descriptor table. Should be protected from concurrent access |
| 66 | * by the caller. |
| 67 | */ |
| 68 | |
| 69 | struct lttng_ust_abi_obj { |
| 70 | union { |
| 71 | struct { |
| 72 | void *private_data; |
| 73 | const struct lttng_ust_abi_objd_ops *ops; |
| 74 | int f_count; |
| 75 | int owner_ref; /* has ref from owner */ |
| 76 | void *owner; |
| 77 | char name[OBJ_NAME_LEN]; |
| 78 | } s; |
| 79 | int freelist_next; /* offset freelist. end is -1. */ |
| 80 | } u; |
| 81 | }; |
| 82 | |
| 83 | struct lttng_ust_abi_objd_table { |
| 84 | struct lttng_ust_abi_obj *array; |
| 85 | unsigned int len, allocated_len; |
| 86 | int freelist_head; /* offset freelist head. end is -1 */ |
| 87 | }; |
| 88 | |
| 89 | static struct lttng_ust_abi_objd_table objd_table = { |
| 90 | .freelist_head = -1, |
| 91 | }; |
| 92 | |
| 93 | static |
| 94 | int objd_alloc(void *private_data, const struct lttng_ust_abi_objd_ops *ops, |
| 95 | void *owner, const char *name) |
| 96 | { |
| 97 | struct lttng_ust_abi_obj *obj; |
| 98 | |
| 99 | if (objd_table.freelist_head != -1) { |
| 100 | obj = &objd_table.array[objd_table.freelist_head]; |
| 101 | objd_table.freelist_head = obj->u.freelist_next; |
| 102 | goto end; |
| 103 | } |
| 104 | |
| 105 | if (objd_table.len >= objd_table.allocated_len) { |
| 106 | unsigned int new_allocated_len, old_allocated_len; |
| 107 | struct lttng_ust_abi_obj *new_table, *old_table; |
| 108 | |
| 109 | old_allocated_len = objd_table.allocated_len; |
| 110 | old_table = objd_table.array; |
| 111 | if (!old_allocated_len) |
| 112 | new_allocated_len = 1; |
| 113 | else |
| 114 | new_allocated_len = old_allocated_len << 1; |
| 115 | new_table = zmalloc(sizeof(struct lttng_ust_abi_obj) * new_allocated_len); |
| 116 | if (!new_table) |
| 117 | return -ENOMEM; |
| 118 | memcpy(new_table, old_table, |
| 119 | sizeof(struct lttng_ust_abi_obj) * old_allocated_len); |
| 120 | free(old_table); |
| 121 | objd_table.array = new_table; |
| 122 | objd_table.allocated_len = new_allocated_len; |
| 123 | } |
| 124 | obj = &objd_table.array[objd_table.len]; |
| 125 | objd_table.len++; |
| 126 | end: |
| 127 | obj->u.s.private_data = private_data; |
| 128 | obj->u.s.ops = ops; |
| 129 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
| 130 | /* count == 2 : allocated + hold ref */ |
| 131 | obj->u.s.owner_ref = 1; /* One owner reference */ |
| 132 | obj->u.s.owner = owner; |
| 133 | strncpy(obj->u.s.name, name, OBJ_NAME_LEN); |
| 134 | obj->u.s.name[OBJ_NAME_LEN - 1] = '\0'; |
| 135 | return obj - objd_table.array; |
| 136 | } |
| 137 | |
| 138 | static |
| 139 | struct lttng_ust_abi_obj *_objd_get(int id) |
| 140 | { |
| 141 | if (id >= objd_table.len) |
| 142 | return NULL; |
| 143 | if (!objd_table.array[id].u.s.f_count) |
| 144 | return NULL; |
| 145 | return &objd_table.array[id]; |
| 146 | } |
| 147 | |
| 148 | static |
| 149 | void *objd_private(int id) |
| 150 | { |
| 151 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
| 152 | assert(obj); |
| 153 | return obj->u.s.private_data; |
| 154 | } |
| 155 | |
| 156 | static |
| 157 | void objd_set_private(int id, void *private_data) |
| 158 | { |
| 159 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
| 160 | assert(obj); |
| 161 | obj->u.s.private_data = private_data; |
| 162 | } |
| 163 | |
| 164 | const struct lttng_ust_abi_objd_ops *lttng_ust_abi_objd_ops(int id) |
| 165 | { |
| 166 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
| 167 | |
| 168 | if (!obj) |
| 169 | return NULL; |
| 170 | return obj->u.s.ops; |
| 171 | } |
| 172 | |
| 173 | static |
| 174 | void objd_free(int id) |
| 175 | { |
| 176 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
| 177 | |
| 178 | assert(obj); |
| 179 | obj->u.freelist_next = objd_table.freelist_head; |
| 180 | objd_table.freelist_head = obj - objd_table.array; |
| 181 | assert(obj->u.s.f_count == 1); |
| 182 | obj->u.s.f_count = 0; /* deallocated */ |
| 183 | } |
| 184 | |
| 185 | static |
| 186 | void objd_ref(int id) |
| 187 | { |
| 188 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
| 189 | assert(obj != NULL); |
| 190 | obj->u.s.f_count++; |
| 191 | } |
| 192 | |
| 193 | int lttng_ust_abi_objd_unref(int id, int is_owner) |
| 194 | { |
| 195 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
| 196 | |
| 197 | if (!obj) |
| 198 | return -EINVAL; |
| 199 | if (obj->u.s.f_count == 1) { |
| 200 | ERR("Reference counting error\n"); |
| 201 | return -EINVAL; |
| 202 | } |
| 203 | if (is_owner) { |
| 204 | if (!obj->u.s.owner_ref) { |
| 205 | ERR("Error decrementing owner reference"); |
| 206 | return -EINVAL; |
| 207 | } |
| 208 | obj->u.s.owner_ref--; |
| 209 | } |
| 210 | if ((--obj->u.s.f_count) == 1) { |
| 211 | const struct lttng_ust_abi_objd_ops *ops = lttng_ust_abi_objd_ops(id); |
| 212 | |
| 213 | if (ops->release) |
| 214 | ops->release(id); |
| 215 | objd_free(id); |
| 216 | } |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static |
| 221 | void objd_table_destroy(void) |
| 222 | { |
| 223 | int i; |
| 224 | |
| 225 | for (i = 0; i < objd_table.allocated_len; i++) { |
| 226 | struct lttng_ust_abi_obj *obj; |
| 227 | |
| 228 | obj = _objd_get(i); |
| 229 | if (!obj) |
| 230 | continue; |
| 231 | if (!obj->u.s.owner_ref) |
| 232 | continue; /* only unref owner ref. */ |
| 233 | (void) lttng_ust_abi_objd_unref(i, 1); |
| 234 | } |
| 235 | free(objd_table.array); |
| 236 | objd_table.array = NULL; |
| 237 | objd_table.len = 0; |
| 238 | objd_table.allocated_len = 0; |
| 239 | objd_table.freelist_head = -1; |
| 240 | } |
| 241 | |
| 242 | const char *lttng_ust_obj_get_name(int id) |
| 243 | { |
| 244 | struct lttng_ust_abi_obj *obj = _objd_get(id); |
| 245 | |
| 246 | if (!obj) |
| 247 | return NULL; |
| 248 | return obj->u.s.name; |
| 249 | } |
| 250 | |
| 251 | void lttng_ust_abi_objd_table_owner_cleanup(void *owner) |
| 252 | { |
| 253 | int i; |
| 254 | |
| 255 | for (i = 0; i < objd_table.allocated_len; i++) { |
| 256 | struct lttng_ust_abi_obj *obj; |
| 257 | |
| 258 | obj = _objd_get(i); |
| 259 | if (!obj) |
| 260 | continue; |
| 261 | if (!obj->u.s.owner) |
| 262 | continue; /* skip root handles */ |
| 263 | if (!obj->u.s.owner_ref) |
| 264 | continue; /* only unref owner ref. */ |
| 265 | if (obj->u.s.owner == owner) |
| 266 | (void) lttng_ust_abi_objd_unref(i, 1); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * This is LTTng's own personal way to create an ABI for sessiond. |
| 272 | * We send commands over a socket. |
| 273 | */ |
| 274 | |
| 275 | static const struct lttng_ust_abi_objd_ops lttng_ops; |
| 276 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops; |
| 277 | static const struct lttng_ust_abi_objd_ops lttng_session_ops; |
| 278 | static const struct lttng_ust_abi_objd_ops lttng_channel_ops; |
| 279 | static const struct lttng_ust_abi_objd_ops lttng_counter_ops; |
| 280 | static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops; |
| 281 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops; |
| 282 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops; |
| 283 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops; |
| 284 | |
| 285 | int lttng_abi_create_root_handle(void) |
| 286 | { |
| 287 | int root_handle; |
| 288 | |
| 289 | /* root handles have NULL owners */ |
| 290 | root_handle = objd_alloc(NULL, <tng_ops, NULL, "root"); |
| 291 | return root_handle; |
| 292 | } |
| 293 | |
| 294 | static |
| 295 | int lttng_is_channel_ready(struct lttng_ust_channel_buffer *lttng_chan) |
| 296 | { |
| 297 | struct lttng_ust_ring_buffer_channel *chan; |
| 298 | unsigned int nr_streams, exp_streams; |
| 299 | |
| 300 | chan = lttng_chan->priv->rb_chan; |
| 301 | nr_streams = channel_handle_get_nr_streams(lttng_chan->priv->rb_chan->handle); |
| 302 | exp_streams = chan->nr_streams; |
| 303 | return nr_streams == exp_streams; |
| 304 | } |
| 305 | |
| 306 | static |
| 307 | int lttng_abi_create_session(void *owner) |
| 308 | { |
| 309 | struct lttng_ust_session *session; |
| 310 | int session_objd, ret; |
| 311 | |
| 312 | session = lttng_session_create(); |
| 313 | if (!session) |
| 314 | return -ENOMEM; |
| 315 | session_objd = objd_alloc(session, <tng_session_ops, owner, "session"); |
| 316 | if (session_objd < 0) { |
| 317 | ret = session_objd; |
| 318 | goto objd_error; |
| 319 | } |
| 320 | session->priv->objd = session_objd; |
| 321 | session->priv->owner = owner; |
| 322 | return session_objd; |
| 323 | |
| 324 | objd_error: |
| 325 | lttng_session_destroy(session); |
| 326 | return ret; |
| 327 | } |
| 328 | |
| 329 | static |
| 330 | long lttng_abi_tracer_version(int objd __attribute__((unused)), |
| 331 | struct lttng_ust_abi_tracer_version *v) |
| 332 | { |
| 333 | v->major = LTTNG_UST_MAJOR_VERSION; |
| 334 | v->minor = LTTNG_UST_MINOR_VERSION; |
| 335 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | static |
| 340 | int lttng_abi_event_notifier_send_fd(void *owner, int *event_notifier_notif_fd) |
| 341 | { |
| 342 | struct lttng_event_notifier_group *event_notifier_group; |
| 343 | int event_notifier_group_objd, ret, fd_flag; |
| 344 | |
| 345 | event_notifier_group = lttng_event_notifier_group_create(); |
| 346 | if (!event_notifier_group) |
| 347 | return -ENOMEM; |
| 348 | |
| 349 | /* |
| 350 | * Set this file descriptor as NON-BLOCKING. |
| 351 | */ |
| 352 | fd_flag = fcntl(*event_notifier_notif_fd, F_GETFL); |
| 353 | |
| 354 | fd_flag |= O_NONBLOCK; |
| 355 | |
| 356 | ret = fcntl(*event_notifier_notif_fd, F_SETFL, fd_flag); |
| 357 | if (ret) { |
| 358 | ret = -errno; |
| 359 | goto fd_error; |
| 360 | } |
| 361 | |
| 362 | event_notifier_group_objd = objd_alloc(event_notifier_group, |
| 363 | <tng_event_notifier_group_ops, owner, "event_notifier_group"); |
| 364 | if (event_notifier_group_objd < 0) { |
| 365 | ret = event_notifier_group_objd; |
| 366 | goto objd_error; |
| 367 | } |
| 368 | |
| 369 | event_notifier_group->objd = event_notifier_group_objd; |
| 370 | event_notifier_group->owner = owner; |
| 371 | event_notifier_group->notification_fd = *event_notifier_notif_fd; |
| 372 | /* Object descriptor takes ownership of notification fd. */ |
| 373 | *event_notifier_notif_fd = -1; |
| 374 | |
| 375 | return event_notifier_group_objd; |
| 376 | |
| 377 | objd_error: |
| 378 | lttng_event_notifier_group_destroy(event_notifier_group); |
| 379 | fd_error: |
| 380 | return ret; |
| 381 | } |
| 382 | |
| 383 | static |
| 384 | long lttng_abi_add_context(int objd __attribute__((unused)), |
| 385 | struct lttng_ust_abi_context *context_param, |
| 386 | union lttng_ust_abi_args *uargs, |
| 387 | struct lttng_ust_ctx **ctx, struct lttng_ust_session *session) |
| 388 | { |
| 389 | return lttng_attach_context(context_param, uargs, ctx, session); |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * lttng_cmd - lttng control through socket commands |
| 394 | * |
| 395 | * @objd: the object descriptor |
| 396 | * @cmd: the command |
| 397 | * @arg: command arg |
| 398 | * @uargs: UST arguments (internal) |
| 399 | * @owner: objd owner |
| 400 | * |
| 401 | * This descriptor implements lttng commands: |
| 402 | * LTTNG_UST_ABI_SESSION |
| 403 | * Returns a LTTng trace session object descriptor |
| 404 | * LTTNG_UST_ABI_TRACER_VERSION |
| 405 | * Returns the LTTng kernel tracer version |
| 406 | * LTTNG_UST_ABI_TRACEPOINT_LIST |
| 407 | * Returns a file descriptor listing available tracepoints |
| 408 | * LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST |
| 409 | * Returns a file descriptor listing available tracepoint fields |
| 410 | * LTTNG_UST_ABI_WAIT_QUIESCENT |
| 411 | * Returns after all previously running probes have completed |
| 412 | * |
| 413 | * The returned session will be deleted when its file descriptor is closed. |
| 414 | */ |
| 415 | static |
| 416 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 417 | union lttng_ust_abi_args *uargs, void *owner) |
| 418 | { |
| 419 | switch (cmd) { |
| 420 | case LTTNG_UST_ABI_SESSION: |
| 421 | return lttng_abi_create_session(owner); |
| 422 | case LTTNG_UST_ABI_TRACER_VERSION: |
| 423 | return lttng_abi_tracer_version(objd, |
| 424 | (struct lttng_ust_abi_tracer_version *) arg); |
| 425 | case LTTNG_UST_ABI_TRACEPOINT_LIST: |
| 426 | return lttng_abi_tracepoint_list(owner); |
| 427 | case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST: |
| 428 | return lttng_abi_tracepoint_field_list(owner); |
| 429 | case LTTNG_UST_ABI_WAIT_QUIESCENT: |
| 430 | lttng_ust_urcu_synchronize_rcu(); |
| 431 | return 0; |
| 432 | case LTTNG_UST_ABI_EVENT_NOTIFIER_GROUP_CREATE: |
| 433 | return lttng_abi_event_notifier_send_fd(owner, |
| 434 | &uargs->event_notifier_handle.event_notifier_notif_fd); |
| 435 | default: |
| 436 | return -EINVAL; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | static const struct lttng_ust_abi_objd_ops lttng_ops = { |
| 441 | .cmd = lttng_cmd, |
| 442 | }; |
| 443 | |
| 444 | static |
| 445 | int lttng_abi_map_channel(int session_objd, |
| 446 | struct lttng_ust_abi_channel *ust_chan, |
| 447 | union lttng_ust_abi_args *uargs, |
| 448 | void *owner) |
| 449 | { |
| 450 | struct lttng_ust_session *session = objd_private(session_objd); |
| 451 | const char *transport_name; |
| 452 | struct lttng_transport *transport; |
| 453 | const char *chan_name; |
| 454 | int chan_objd; |
| 455 | struct lttng_ust_shm_handle *channel_handle; |
| 456 | struct lttng_ust_abi_channel_config *lttng_chan_config; |
| 457 | struct lttng_ust_channel_buffer *lttng_chan_buf; |
| 458 | struct lttng_ust_ring_buffer_channel *chan; |
| 459 | struct lttng_ust_ring_buffer_config *config; |
| 460 | void *chan_data; |
| 461 | int wakeup_fd; |
| 462 | uint64_t len; |
| 463 | int ret; |
| 464 | enum lttng_ust_abi_chan_type type; |
| 465 | |
| 466 | chan_data = uargs->channel.chan_data; |
| 467 | wakeup_fd = uargs->channel.wakeup_fd; |
| 468 | len = ust_chan->len; |
| 469 | type = ust_chan->type; |
| 470 | |
| 471 | switch (type) { |
| 472 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
| 473 | break; |
| 474 | default: |
| 475 | ret = -EINVAL; |
| 476 | goto invalid; |
| 477 | } |
| 478 | |
| 479 | if (session->priv->been_active) { |
| 480 | ret = -EBUSY; |
| 481 | goto active; /* Refuse to add channel to active session */ |
| 482 | } |
| 483 | |
| 484 | lttng_chan_buf = lttng_ust_alloc_channel_buffer(); |
| 485 | if (!lttng_chan_buf) { |
| 486 | ret = -ENOMEM; |
| 487 | goto lttng_chan_buf_error; |
| 488 | } |
| 489 | |
| 490 | channel_handle = channel_handle_create(chan_data, len, wakeup_fd); |
| 491 | if (!channel_handle) { |
| 492 | ret = -EINVAL; |
| 493 | goto handle_error; |
| 494 | } |
| 495 | |
| 496 | /* Ownership of chan_data and wakeup_fd taken by channel handle. */ |
| 497 | uargs->channel.chan_data = NULL; |
| 498 | uargs->channel.wakeup_fd = -1; |
| 499 | |
| 500 | chan = shmp(channel_handle, channel_handle->chan); |
| 501 | assert(chan); |
| 502 | chan->handle = channel_handle; |
| 503 | config = &chan->backend.config; |
| 504 | lttng_chan_config = channel_get_private_config(chan); |
| 505 | if (!lttng_chan_config) { |
| 506 | ret = -EINVAL; |
| 507 | goto alloc_error; |
| 508 | } |
| 509 | |
| 510 | if (lttng_ust_session_uuid_validate(session, lttng_chan_config->uuid)) { |
| 511 | ret = -EINVAL; |
| 512 | goto uuid_error; |
| 513 | } |
| 514 | |
| 515 | /* Lookup transport name */ |
| 516 | switch (type) { |
| 517 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
| 518 | if (config->output == RING_BUFFER_MMAP) { |
| 519 | if (config->mode == RING_BUFFER_OVERWRITE) { |
| 520 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { |
| 521 | transport_name = "relay-overwrite-mmap"; |
| 522 | } else { |
| 523 | transport_name = "relay-overwrite-rt-mmap"; |
| 524 | } |
| 525 | } else { |
| 526 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { |
| 527 | transport_name = "relay-discard-mmap"; |
| 528 | } else { |
| 529 | transport_name = "relay-discard-rt-mmap"; |
| 530 | } |
| 531 | } |
| 532 | } else { |
| 533 | ret = -EINVAL; |
| 534 | goto notransport; |
| 535 | } |
| 536 | chan_name = "channel"; |
| 537 | break; |
| 538 | default: |
| 539 | ret = -EINVAL; |
| 540 | goto notransport; |
| 541 | } |
| 542 | transport = lttng_ust_transport_find(transport_name); |
| 543 | if (!transport) { |
| 544 | DBG("LTTng transport %s not found\n", |
| 545 | transport_name); |
| 546 | ret = -EINVAL; |
| 547 | goto notransport; |
| 548 | } |
| 549 | |
| 550 | chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name); |
| 551 | if (chan_objd < 0) { |
| 552 | ret = chan_objd; |
| 553 | goto objd_error; |
| 554 | } |
| 555 | |
| 556 | /* Initialize our lttng chan */ |
| 557 | lttng_chan_buf->parent->enabled = 1; |
| 558 | lttng_chan_buf->parent->session = session; |
| 559 | |
| 560 | lttng_chan_buf->priv->parent.tstate = 1; |
| 561 | lttng_chan_buf->priv->ctx = NULL; |
| 562 | lttng_chan_buf->priv->rb_chan = chan; |
| 563 | |
| 564 | lttng_chan_buf->ops = &transport->ops; |
| 565 | |
| 566 | memcpy(&chan->backend.config, |
| 567 | transport->client_config, |
| 568 | sizeof(chan->backend.config)); |
| 569 | cds_list_add(<tng_chan_buf->priv->node, &session->priv->chan_head); |
| 570 | lttng_chan_buf->priv->header_type = 0; |
| 571 | lttng_chan_buf->priv->type = type; |
| 572 | /* Copy fields from lttng ust chan config. */ |
| 573 | lttng_chan_buf->priv->id = lttng_chan_config->id; |
| 574 | memcpy(lttng_chan_buf->priv->uuid, lttng_chan_config->uuid, LTTNG_UST_UUID_LEN); |
| 575 | channel_set_private(chan, lttng_chan_buf); |
| 576 | |
| 577 | /* |
| 578 | * We tolerate no failure path after channel creation. It will stay |
| 579 | * invariant for the rest of the session. |
| 580 | */ |
| 581 | objd_set_private(chan_objd, lttng_chan_buf); |
| 582 | lttng_chan_buf->priv->parent.objd = chan_objd; |
| 583 | /* The channel created holds a reference on the session */ |
| 584 | objd_ref(session_objd); |
| 585 | return chan_objd; |
| 586 | |
| 587 | /* error path after channel was created */ |
| 588 | objd_error: |
| 589 | notransport: |
| 590 | uuid_error: |
| 591 | alloc_error: |
| 592 | channel_destroy(chan, channel_handle, 0); |
| 593 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
| 594 | return ret; |
| 595 | |
| 596 | handle_error: |
| 597 | lttng_ust_free_channel_common(lttng_chan_buf->parent); |
| 598 | lttng_chan_buf_error: |
| 599 | active: |
| 600 | invalid: |
| 601 | return ret; |
| 602 | } |
| 603 | |
| 604 | static |
| 605 | bool check_zero(const char *p, size_t len) |
| 606 | { |
| 607 | size_t i; |
| 608 | |
| 609 | for (i = 0; i < len; i++) { |
| 610 | if (p[i] != 0) |
| 611 | return false; |
| 612 | } |
| 613 | return true; |
| 614 | } |
| 615 | |
| 616 | static |
| 617 | int copy_abi_struct(void *dst_struct, size_t dst_struct_len, |
| 618 | const void *src_struct, size_t src_struct_len) |
| 619 | { |
| 620 | if (dst_struct_len >= src_struct_len) { |
| 621 | memcpy(dst_struct, src_struct, src_struct_len); |
| 622 | if (dst_struct_len > src_struct_len) |
| 623 | memset(dst_struct + src_struct_len, 0, dst_struct_len - src_struct_len); |
| 624 | } else { /* dst_struct_len < src_struct_len */ |
| 625 | /* Validate zero-padding. */ |
| 626 | if (!check_zero(src_struct + dst_struct_len, src_struct_len - dst_struct_len)) |
| 627 | return -E2BIG; |
| 628 | memcpy(dst_struct, src_struct, dst_struct_len); |
| 629 | } |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | static |
| 634 | long lttng_session_create_counter( |
| 635 | int session_objd, |
| 636 | const struct lttng_ust_abi_counter_conf *abi_counter_conf, |
| 637 | union lttng_ust_abi_args *uargs, |
| 638 | void *owner) |
| 639 | { |
| 640 | struct lttng_ust_session *session = objd_private(session_objd); |
| 641 | int counter_objd, ret; |
| 642 | const char *counter_transport_name; |
| 643 | struct lttng_ust_channel_counter *counter = NULL; |
| 644 | struct lttng_counter_dimension dimensions[1] = {}; |
| 645 | size_t number_dimensions = 1; |
| 646 | struct lttng_ust_abi_counter_conf counter_conf; |
| 647 | uint32_t min_expected_len = lttng_ust_offsetofend(struct lttng_ust_abi_counter_conf, elem_len); |
| 648 | const struct lttng_ust_abi_counter_dimension *abi_dimension; |
| 649 | struct lttng_ust_abi_counter_dimension dimension; |
| 650 | |
| 651 | if (uargs->counter.len < min_expected_len) { |
| 652 | ERR("LTTng: Map: Counter configuration of wrong size."); |
| 653 | return -EINVAL; |
| 654 | } |
| 655 | if (abi_counter_conf->len > uargs->counter.len || abi_counter_conf->len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_conf, elem_len)) { |
| 656 | return -EINVAL; |
| 657 | } |
| 658 | ret = copy_abi_struct(&counter_conf, sizeof(counter_conf), abi_counter_conf, abi_counter_conf->len); |
| 659 | if (ret) { |
| 660 | ERR("Unexpected counter configuration structure content"); |
| 661 | return ret; |
| 662 | } |
| 663 | if (counter_conf.number_dimensions != 1) { |
| 664 | ERR("LTTng: Map: Unsupprted number of dimensions %u.", counter_conf.number_dimensions); |
| 665 | return -EINVAL; |
| 666 | } |
| 667 | if (counter_conf.elem_len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_dimension, overflow_index)) { |
| 668 | ERR("Unexpected dimension array element length %u.", counter_conf.elem_len); |
| 669 | return -EINVAL; |
| 670 | } |
| 671 | if (counter_conf.len + counter_conf.elem_len > uargs->counter.len) { |
| 672 | return -EINVAL; |
| 673 | } |
| 674 | abi_dimension = (const struct lttng_ust_abi_counter_dimension *)(((char *)abi_counter_conf) + counter_conf.len); |
| 675 | ret = copy_abi_struct(&dimension, sizeof(dimension), abi_dimension, counter_conf.elem_len); |
| 676 | if (ret) { |
| 677 | ERR("Unexpected dimension structure content"); |
| 678 | return ret; |
| 679 | } |
| 680 | if (counter_conf.arithmetic != LTTNG_UST_ABI_COUNTER_ARITHMETIC_MODULAR) { |
| 681 | ERR("LTTng: Map: Counter of the wrong type."); |
| 682 | return -EINVAL; |
| 683 | } |
| 684 | if (counter_conf.global_sum_step) { |
| 685 | /* Unsupported. */ |
| 686 | return -EINVAL; |
| 687 | } |
| 688 | switch (counter_conf.bitness) { |
| 689 | case LTTNG_UST_ABI_COUNTER_BITNESS_64: |
| 690 | counter_transport_name = "counter-per-cpu-64-modular"; |
| 691 | break; |
| 692 | case LTTNG_UST_ABI_COUNTER_BITNESS_32: |
| 693 | counter_transport_name = "counter-per-cpu-32-modular"; |
| 694 | break; |
| 695 | default: |
| 696 | return -EINVAL; |
| 697 | } |
| 698 | |
| 699 | dimensions[0].size = dimension.size; |
| 700 | dimensions[0].underflow_index = dimension.underflow_index; |
| 701 | dimensions[0].overflow_index = dimension.overflow_index; |
| 702 | dimensions[0].has_underflow = dimension.flags & LTTNG_UST_ABI_COUNTER_DIMENSION_FLAG_UNDERFLOW; |
| 703 | dimensions[0].has_overflow = dimension.flags & LTTNG_UST_ABI_COUNTER_DIMENSION_FLAG_OVERFLOW; |
| 704 | switch (dimension.key_type) { |
| 705 | case LTTNG_UST_ABI_KEY_TYPE_TOKENS: |
| 706 | dimensions[0].key_type = LTTNG_KEY_TYPE_TOKENS; |
| 707 | break; |
| 708 | case LTTNG_UST_ABI_KEY_TYPE_INTEGER: /* Fall-through */ |
| 709 | default: |
| 710 | return -EINVAL; |
| 711 | } |
| 712 | |
| 713 | counter_objd = objd_alloc(NULL, <tng_counter_ops, owner, "counter"); |
| 714 | if (counter_objd < 0) { |
| 715 | ret = counter_objd; |
| 716 | goto objd_error; |
| 717 | } |
| 718 | |
| 719 | counter = lttng_ust_counter_create(counter_transport_name, |
| 720 | number_dimensions, dimensions, |
| 721 | 0, counter_conf.flags & LTTNG_UST_ABI_COUNTER_CONF_FLAG_COALESCE_HITS); |
| 722 | if (!counter) { |
| 723 | ret = -EINVAL; |
| 724 | goto counter_error; |
| 725 | } |
| 726 | counter->parent->session = session; |
| 727 | cds_list_add(&counter->priv->node, &session->priv->counters_head); |
| 728 | objd_set_private(counter_objd, counter); |
| 729 | counter->priv->parent.objd = counter_objd; |
| 730 | counter->priv->parent.tstate = 1; |
| 731 | counter->parent->enabled = 1; |
| 732 | /* The channel created holds a reference on the session */ |
| 733 | objd_ref(session_objd); |
| 734 | return counter_objd; |
| 735 | |
| 736 | counter_error: |
| 737 | { |
| 738 | int err; |
| 739 | |
| 740 | err = lttng_ust_abi_objd_unref(counter_objd, 1); |
| 741 | assert(!err); |
| 742 | } |
| 743 | objd_error: |
| 744 | return ret; |
| 745 | } |
| 746 | |
| 747 | /** |
| 748 | * lttng_session_cmd - lttng session object command |
| 749 | * |
| 750 | * @obj: the object |
| 751 | * @cmd: the command |
| 752 | * @arg: command arg |
| 753 | * @uargs: UST arguments (internal) |
| 754 | * @owner: objd owner |
| 755 | * |
| 756 | * This descriptor implements lttng commands: |
| 757 | * LTTNG_UST_ABI_CHANNEL |
| 758 | * Returns a LTTng channel object descriptor |
| 759 | * LTTNG_UST_ABI_ENABLE |
| 760 | * Enables tracing for a session (weak enable) |
| 761 | * LTTNG_UST_ABI_DISABLE |
| 762 | * Disables tracing for a session (strong disable) |
| 763 | * |
| 764 | * The returned channel will be deleted when its file descriptor is closed. |
| 765 | */ |
| 766 | static |
| 767 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 768 | union lttng_ust_abi_args *uargs, void *owner) |
| 769 | { |
| 770 | struct lttng_ust_session *session = objd_private(objd); |
| 771 | |
| 772 | switch (cmd) { |
| 773 | case LTTNG_UST_ABI_CHANNEL: |
| 774 | return lttng_abi_map_channel(objd, |
| 775 | (struct lttng_ust_abi_channel *) arg, |
| 776 | uargs, owner); |
| 777 | case LTTNG_UST_ABI_SESSION_START: |
| 778 | case LTTNG_UST_ABI_ENABLE: |
| 779 | return lttng_session_enable(session); |
| 780 | case LTTNG_UST_ABI_SESSION_STOP: |
| 781 | case LTTNG_UST_ABI_DISABLE: |
| 782 | return lttng_session_disable(session); |
| 783 | case LTTNG_UST_ABI_SESSION_STATEDUMP: |
| 784 | return lttng_session_statedump(session); |
| 785 | case LTTNG_UST_ABI_COUNTER: |
| 786 | return lttng_session_create_counter(objd, |
| 787 | (struct lttng_ust_abi_counter_conf *)arg, |
| 788 | uargs, owner); |
| 789 | default: |
| 790 | return -EINVAL; |
| 791 | } |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * Called when the last file reference is dropped. |
| 796 | * |
| 797 | * Big fat note: channels and events are invariant for the whole session after |
| 798 | * their creation. So this session destruction also destroys all channel and |
| 799 | * event structures specific to this session (they are not destroyed when their |
| 800 | * individual file is released). |
| 801 | */ |
| 802 | static |
| 803 | int lttng_release_session(int objd) |
| 804 | { |
| 805 | struct lttng_ust_session *session = objd_private(objd); |
| 806 | |
| 807 | if (session) { |
| 808 | lttng_session_destroy(session); |
| 809 | return 0; |
| 810 | } else { |
| 811 | return -EINVAL; |
| 812 | } |
| 813 | } |
| 814 | |
| 815 | static const struct lttng_ust_abi_objd_ops lttng_session_ops = { |
| 816 | .release = lttng_release_session, |
| 817 | .cmd = lttng_session_cmd, |
| 818 | }; |
| 819 | |
| 820 | static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj, |
| 821 | void *owner, struct lttng_ust_abi_event_notifier *event_notifier_param, |
| 822 | enum lttng_enabler_format_type type) |
| 823 | { |
| 824 | struct lttng_event_notifier_group *event_notifier_group = |
| 825 | objd_private(event_notifier_group_obj); |
| 826 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
| 827 | int event_notifier_objd, ret; |
| 828 | |
| 829 | event_notifier_param->event.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
| 830 | event_notifier_objd = objd_alloc(NULL, <tng_event_notifier_enabler_ops, owner, |
| 831 | "event_notifier enabler"); |
| 832 | if (event_notifier_objd < 0) { |
| 833 | ret = event_notifier_objd; |
| 834 | goto objd_error; |
| 835 | } |
| 836 | |
| 837 | event_notifier_enabler = lttng_event_notifier_enabler_create( |
| 838 | event_notifier_group, type, event_notifier_param); |
| 839 | if (!event_notifier_enabler) { |
| 840 | ret = -ENOMEM; |
| 841 | goto event_notifier_error; |
| 842 | } |
| 843 | |
| 844 | objd_set_private(event_notifier_objd, event_notifier_enabler); |
| 845 | /* The event_notifier holds a reference on the event_notifier group. */ |
| 846 | objd_ref(event_notifier_enabler->group->objd); |
| 847 | |
| 848 | return event_notifier_objd; |
| 849 | |
| 850 | event_notifier_error: |
| 851 | { |
| 852 | int err; |
| 853 | |
| 854 | err = lttng_ust_abi_objd_unref(event_notifier_objd, 1); |
| 855 | assert(!err); |
| 856 | } |
| 857 | objd_error: |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | static |
| 862 | long lttng_event_notifier_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 863 | union lttng_ust_abi_args *uargs __attribute__((unused)), |
| 864 | void *owner __attribute__((unused))) |
| 865 | { |
| 866 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); |
| 867 | switch (cmd) { |
| 868 | case LTTNG_UST_ABI_FILTER: |
| 869 | return lttng_event_enabler_attach_filter_bytecode( |
| 870 | &event_notifier_enabler->parent, |
| 871 | (struct lttng_ust_bytecode_node **) arg); |
| 872 | case LTTNG_UST_ABI_EXCLUSION: |
| 873 | return lttng_event_enabler_attach_exclusion(&event_notifier_enabler->parent, |
| 874 | (struct lttng_ust_excluder_node **) arg); |
| 875 | case LTTNG_UST_ABI_CAPTURE: |
| 876 | return lttng_event_notifier_enabler_attach_capture_bytecode( |
| 877 | event_notifier_enabler, |
| 878 | (struct lttng_ust_bytecode_node **) arg); |
| 879 | case LTTNG_UST_ABI_ENABLE: |
| 880 | return lttng_event_enabler_enable(&event_notifier_enabler->parent); |
| 881 | case LTTNG_UST_ABI_DISABLE: |
| 882 | return lttng_event_enabler_disable(&event_notifier_enabler->parent); |
| 883 | default: |
| 884 | return -EINVAL; |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | /** |
| 889 | * lttng_event_notifier_group_error_counter_cmd - lttng event_notifier group error counter object command |
| 890 | * |
| 891 | * @obj: the object |
| 892 | * @cmd: the command |
| 893 | * @arg: command arg |
| 894 | * @uargs: UST arguments (internal) |
| 895 | * @owner: objd owner |
| 896 | * |
| 897 | * This descriptor implements lttng commands: |
| 898 | * LTTNG_UST_ABI_COUNTER_GLOBAL |
| 899 | * Return negative error code on error, 0 on success. |
| 900 | * LTTNG_UST_ABI_COUNTER_CPU |
| 901 | * Return negative error code on error, 0 on success. |
| 902 | */ |
| 903 | static |
| 904 | long lttng_event_notifier_group_error_counter_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 905 | union lttng_ust_abi_args *uargs, void *owner __attribute__((unused))) |
| 906 | { |
| 907 | int ret; |
| 908 | struct lttng_ust_channel_counter *counter = objd_private(objd); |
| 909 | |
| 910 | switch (cmd) { |
| 911 | case LTTNG_UST_ABI_COUNTER_GLOBAL: |
| 912 | ret = -EINVAL; /* Unimplemented. */ |
| 913 | break; |
| 914 | case LTTNG_UST_ABI_COUNTER_CPU: |
| 915 | { |
| 916 | struct lttng_ust_abi_counter_cpu *abi_counter_cpu = |
| 917 | (struct lttng_ust_abi_counter_cpu *) arg; |
| 918 | struct lttng_ust_abi_counter_cpu counter_cpu; |
| 919 | |
| 920 | if (abi_counter_cpu->len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_cpu, cpu_nr)) { |
| 921 | return -EINVAL; |
| 922 | } |
| 923 | ret = copy_abi_struct(&counter_cpu, sizeof(counter_cpu), |
| 924 | abi_counter_cpu, abi_counter_cpu->len); |
| 925 | if (ret) |
| 926 | return ret; |
| 927 | ret = lttng_counter_set_cpu_shm(counter->priv->counter, |
| 928 | counter_cpu.cpu_nr, uargs->counter_shm.shm_fd); |
| 929 | if (!ret) { |
| 930 | /* Take ownership of the shm_fd. */ |
| 931 | uargs->counter_shm.shm_fd = -1; |
| 932 | } |
| 933 | break; |
| 934 | } |
| 935 | default: |
| 936 | ret = -EINVAL; |
| 937 | break; |
| 938 | } |
| 939 | |
| 940 | return ret; |
| 941 | } |
| 942 | |
| 943 | int lttng_release_event_notifier_group_error_counter(int objd) |
| 944 | __attribute__((visibility("hidden"))); |
| 945 | int lttng_release_event_notifier_group_error_counter(int objd) |
| 946 | { |
| 947 | struct lttng_ust_channel_counter *counter = objd_private(objd); |
| 948 | |
| 949 | if (counter) { |
| 950 | return lttng_ust_abi_objd_unref(counter->priv->event_notifier_group->objd, 0); |
| 951 | } else { |
| 952 | return -EINVAL; |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_error_counter_ops = { |
| 957 | .release = lttng_release_event_notifier_group_error_counter, |
| 958 | .cmd = lttng_event_notifier_group_error_counter_cmd, |
| 959 | }; |
| 960 | |
| 961 | static |
| 962 | int lttng_ust_event_notifier_group_create_error_counter(int event_notifier_group_objd, |
| 963 | struct lttng_ust_abi_counter_conf *abi_counter_conf, |
| 964 | union lttng_ust_abi_args *uargs, |
| 965 | void *owner) |
| 966 | { |
| 967 | const char *counter_transport_name; |
| 968 | struct lttng_event_notifier_group *event_notifier_group = |
| 969 | objd_private(event_notifier_group_objd); |
| 970 | struct lttng_ust_channel_counter *counter; |
| 971 | int counter_objd, ret; |
| 972 | size_t counter_len; |
| 973 | struct lttng_counter_dimension dimensions[1] = {}; |
| 974 | struct lttng_ust_abi_counter_conf counter_conf; |
| 975 | uint32_t min_expected_len = lttng_ust_offsetofend(struct lttng_ust_abi_counter_conf, elem_len); |
| 976 | const struct lttng_ust_abi_counter_dimension *abi_dimension; |
| 977 | struct lttng_ust_abi_counter_dimension dimension; |
| 978 | |
| 979 | if (event_notifier_group->error_counter) |
| 980 | return -EBUSY; |
| 981 | |
| 982 | if (uargs->counter.len < min_expected_len) { |
| 983 | ERR("LTTng: Counter configuration of wrong size."); |
| 984 | return -EINVAL; |
| 985 | } |
| 986 | if (abi_counter_conf->len > uargs->counter.len || abi_counter_conf->len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_conf, elem_len)) { |
| 987 | return -EINVAL; |
| 988 | } |
| 989 | ret = copy_abi_struct(&counter_conf, sizeof(counter_conf), abi_counter_conf, abi_counter_conf->len); |
| 990 | if (ret) { |
| 991 | ERR("Unexpected counter configuration structure content"); |
| 992 | return ret; |
| 993 | } |
| 994 | if (counter_conf.number_dimensions != 1) { |
| 995 | ERR("LTTng: Map: Unsupprted number of dimensions %u.", counter_conf.number_dimensions); |
| 996 | return -EINVAL; |
| 997 | } |
| 998 | if (counter_conf.elem_len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_dimension, overflow_index)) { |
| 999 | ERR("Unexpected dimension array element length %u.", counter_conf.elem_len); |
| 1000 | return -EINVAL; |
| 1001 | } |
| 1002 | if (counter_conf.len + counter_conf.elem_len > uargs->counter.len) { |
| 1003 | return -EINVAL; |
| 1004 | } |
| 1005 | abi_dimension = (const struct lttng_ust_abi_counter_dimension *)(((char *)abi_counter_conf) + counter_conf.len); |
| 1006 | ret = copy_abi_struct(&dimension, sizeof(dimension), abi_dimension, counter_conf.elem_len); |
| 1007 | if (ret) { |
| 1008 | ERR("Unexpected dimension structure content"); |
| 1009 | return ret; |
| 1010 | } |
| 1011 | if (counter_conf.arithmetic != LTTNG_UST_ABI_COUNTER_ARITHMETIC_MODULAR) { |
| 1012 | ERR("LTTng: Counter of the wrong type."); |
| 1013 | return -EINVAL; |
| 1014 | } |
| 1015 | if (counter_conf.global_sum_step) { |
| 1016 | /* Unsupported. */ |
| 1017 | return -EINVAL; |
| 1018 | } |
| 1019 | switch (counter_conf.bitness) { |
| 1020 | case LTTNG_UST_ABI_COUNTER_BITNESS_64: |
| 1021 | counter_transport_name = "counter-per-cpu-64-modular"; |
| 1022 | break; |
| 1023 | case LTTNG_UST_ABI_COUNTER_BITNESS_32: |
| 1024 | counter_transport_name = "counter-per-cpu-32-modular"; |
| 1025 | break; |
| 1026 | default: |
| 1027 | return -EINVAL; |
| 1028 | } |
| 1029 | |
| 1030 | counter_len = dimension.size; |
| 1031 | dimensions[0].size = counter_len; |
| 1032 | dimensions[0].underflow_index = dimension.underflow_index; |
| 1033 | dimensions[0].overflow_index = dimension.overflow_index; |
| 1034 | dimensions[0].has_underflow = dimension.flags & LTTNG_UST_ABI_COUNTER_DIMENSION_FLAG_UNDERFLOW; |
| 1035 | dimensions[0].has_overflow = dimension.flags & LTTNG_UST_ABI_COUNTER_DIMENSION_FLAG_OVERFLOW; |
| 1036 | |
| 1037 | counter_objd = objd_alloc(NULL, <tng_event_notifier_group_error_counter_ops, owner, |
| 1038 | "event_notifier group error counter"); |
| 1039 | if (counter_objd < 0) { |
| 1040 | ret = counter_objd; |
| 1041 | goto objd_error; |
| 1042 | } |
| 1043 | |
| 1044 | counter = lttng_ust_counter_create(counter_transport_name, 1, dimensions, 0, false); |
| 1045 | if (!counter) { |
| 1046 | ret = -EINVAL; |
| 1047 | goto create_error; |
| 1048 | } |
| 1049 | |
| 1050 | event_notifier_group->error_counter_len = counter_len; |
| 1051 | /* |
| 1052 | * store-release to publish error counter matches load-acquire |
| 1053 | * in record_error. Ensures the counter is created and the |
| 1054 | * error_counter_len is set before they are used. |
| 1055 | * Currently a full memory barrier is used, which could be |
| 1056 | * turned into acquire-release barriers. |
| 1057 | */ |
| 1058 | cmm_smp_mb(); |
| 1059 | CMM_STORE_SHARED(event_notifier_group->error_counter, counter); |
| 1060 | |
| 1061 | counter->priv->parent.objd = counter_objd; |
| 1062 | counter->priv->event_notifier_group = event_notifier_group; /* owner */ |
| 1063 | |
| 1064 | objd_set_private(counter_objd, counter); |
| 1065 | /* The error counter holds a reference on the event_notifier group. */ |
| 1066 | objd_ref(event_notifier_group->objd); |
| 1067 | |
| 1068 | return counter_objd; |
| 1069 | |
| 1070 | create_error: |
| 1071 | { |
| 1072 | int err; |
| 1073 | |
| 1074 | err = lttng_ust_abi_objd_unref(counter_objd, 1); |
| 1075 | assert(!err); |
| 1076 | } |
| 1077 | objd_error: |
| 1078 | return ret; |
| 1079 | } |
| 1080 | |
| 1081 | static |
| 1082 | long lttng_event_notifier_group_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 1083 | union lttng_ust_abi_args *uargs, void *owner) |
| 1084 | { |
| 1085 | int ret; |
| 1086 | |
| 1087 | switch (cmd) { |
| 1088 | case LTTNG_UST_ABI_EVENT_NOTIFIER_CREATE: |
| 1089 | { |
| 1090 | struct lttng_ust_abi_event_notifier *abi_event_notifier = |
| 1091 | (struct lttng_ust_abi_event_notifier *) arg; |
| 1092 | struct lttng_ust_abi_event_notifier event_notifier = {}; |
| 1093 | |
| 1094 | if (uargs->event_notifier.len < lttng_ust_offsetofend(struct lttng_ust_abi_event_notifier, error_counter_index)) |
| 1095 | return -EINVAL; |
| 1096 | ret = copy_abi_struct(&event_notifier, sizeof(event_notifier), |
| 1097 | abi_event_notifier, uargs->event_notifier.len); |
| 1098 | if (ret) |
| 1099 | return ret; |
| 1100 | event_notifier.event.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
| 1101 | if (strutils_is_star_glob_pattern(event_notifier.event.name)) { |
| 1102 | /* |
| 1103 | * If the event name is a star globbing pattern, |
| 1104 | * we create the special star globbing enabler. |
| 1105 | */ |
| 1106 | return lttng_ust_event_notifier_enabler_create(objd, |
| 1107 | owner, &event_notifier, |
| 1108 | LTTNG_ENABLER_FORMAT_STAR_GLOB); |
| 1109 | } else { |
| 1110 | return lttng_ust_event_notifier_enabler_create(objd, |
| 1111 | owner, &event_notifier, |
| 1112 | LTTNG_ENABLER_FORMAT_EVENT); |
| 1113 | } |
| 1114 | } |
| 1115 | case LTTNG_UST_ABI_COUNTER: |
| 1116 | { |
| 1117 | return lttng_ust_event_notifier_group_create_error_counter( |
| 1118 | objd, (struct lttng_ust_abi_counter_conf *) arg, uargs, owner); |
| 1119 | } |
| 1120 | default: |
| 1121 | return -EINVAL; |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | static |
| 1126 | int lttng_event_notifier_enabler_release(int objd) |
| 1127 | { |
| 1128 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); |
| 1129 | |
| 1130 | if (event_notifier_enabler) |
| 1131 | return lttng_ust_abi_objd_unref(event_notifier_enabler->group->objd, 0); |
| 1132 | return 0; |
| 1133 | } |
| 1134 | |
| 1135 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops = { |
| 1136 | .release = lttng_event_notifier_enabler_release, |
| 1137 | .cmd = lttng_event_notifier_enabler_cmd, |
| 1138 | }; |
| 1139 | |
| 1140 | static |
| 1141 | int lttng_release_event_notifier_group(int objd) |
| 1142 | { |
| 1143 | struct lttng_event_notifier_group *event_notifier_group = objd_private(objd); |
| 1144 | |
| 1145 | if (event_notifier_group) { |
| 1146 | lttng_event_notifier_group_destroy(event_notifier_group); |
| 1147 | return 0; |
| 1148 | } else { |
| 1149 | return -EINVAL; |
| 1150 | } |
| 1151 | } |
| 1152 | |
| 1153 | static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops = { |
| 1154 | .release = lttng_release_event_notifier_group, |
| 1155 | .cmd = lttng_event_notifier_group_cmd, |
| 1156 | }; |
| 1157 | |
| 1158 | static |
| 1159 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 1160 | union lttng_ust_abi_args *uargs __attribute__((unused)), |
| 1161 | void *owner __attribute__((unused))) |
| 1162 | { |
| 1163 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
| 1164 | struct lttng_ust_abi_tracepoint_iter *tp = |
| 1165 | (struct lttng_ust_abi_tracepoint_iter *) arg; |
| 1166 | struct lttng_ust_abi_tracepoint_iter *iter; |
| 1167 | |
| 1168 | switch (cmd) { |
| 1169 | case LTTNG_UST_ABI_TRACEPOINT_LIST_GET: |
| 1170 | { |
| 1171 | iter = lttng_ust_tracepoint_list_get_iter_next(list); |
| 1172 | if (!iter) |
| 1173 | return -LTTNG_UST_ERR_NOENT; |
| 1174 | memcpy(tp, iter, sizeof(*tp)); |
| 1175 | return 0; |
| 1176 | } |
| 1177 | default: |
| 1178 | return -EINVAL; |
| 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | static |
| 1183 | int lttng_abi_tracepoint_list(void *owner) |
| 1184 | { |
| 1185 | int list_objd, ret; |
| 1186 | struct lttng_ust_tracepoint_list *list; |
| 1187 | |
| 1188 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list"); |
| 1189 | if (list_objd < 0) { |
| 1190 | ret = list_objd; |
| 1191 | goto objd_error; |
| 1192 | } |
| 1193 | list = zmalloc(sizeof(*list)); |
| 1194 | if (!list) { |
| 1195 | ret = -ENOMEM; |
| 1196 | goto alloc_error; |
| 1197 | } |
| 1198 | objd_set_private(list_objd, list); |
| 1199 | |
| 1200 | /* populate list by walking on all registered probes. */ |
| 1201 | ret = lttng_probes_get_event_list(list); |
| 1202 | if (ret) { |
| 1203 | goto list_error; |
| 1204 | } |
| 1205 | return list_objd; |
| 1206 | |
| 1207 | list_error: |
| 1208 | free(list); |
| 1209 | alloc_error: |
| 1210 | { |
| 1211 | int err; |
| 1212 | |
| 1213 | err = lttng_ust_abi_objd_unref(list_objd, 1); |
| 1214 | assert(!err); |
| 1215 | } |
| 1216 | objd_error: |
| 1217 | return ret; |
| 1218 | } |
| 1219 | |
| 1220 | static |
| 1221 | int lttng_release_tracepoint_list(int objd) |
| 1222 | { |
| 1223 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
| 1224 | |
| 1225 | if (list) { |
| 1226 | lttng_probes_prune_event_list(list); |
| 1227 | free(list); |
| 1228 | return 0; |
| 1229 | } else { |
| 1230 | return -EINVAL; |
| 1231 | } |
| 1232 | } |
| 1233 | |
| 1234 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops = { |
| 1235 | .release = lttng_release_tracepoint_list, |
| 1236 | .cmd = lttng_tracepoint_list_cmd, |
| 1237 | }; |
| 1238 | |
| 1239 | static |
| 1240 | long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd, |
| 1241 | unsigned long arg __attribute__((unused)), union lttng_ust_abi_args *uargs, |
| 1242 | void *owner __attribute__((unused))) |
| 1243 | { |
| 1244 | struct lttng_ust_field_list *list = objd_private(objd); |
| 1245 | struct lttng_ust_abi_field_iter *tp = &uargs->field_list.entry; |
| 1246 | struct lttng_ust_abi_field_iter *iter; |
| 1247 | |
| 1248 | switch (cmd) { |
| 1249 | case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST_GET: |
| 1250 | { |
| 1251 | iter = lttng_ust_field_list_get_iter_next(list); |
| 1252 | if (!iter) |
| 1253 | return -LTTNG_UST_ERR_NOENT; |
| 1254 | memcpy(tp, iter, sizeof(*tp)); |
| 1255 | return 0; |
| 1256 | } |
| 1257 | default: |
| 1258 | return -EINVAL; |
| 1259 | } |
| 1260 | } |
| 1261 | |
| 1262 | static |
| 1263 | int lttng_abi_tracepoint_field_list(void *owner) |
| 1264 | { |
| 1265 | int list_objd, ret; |
| 1266 | struct lttng_ust_field_list *list; |
| 1267 | |
| 1268 | list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner, |
| 1269 | "tp_field_list"); |
| 1270 | if (list_objd < 0) { |
| 1271 | ret = list_objd; |
| 1272 | goto objd_error; |
| 1273 | } |
| 1274 | list = zmalloc(sizeof(*list)); |
| 1275 | if (!list) { |
| 1276 | ret = -ENOMEM; |
| 1277 | goto alloc_error; |
| 1278 | } |
| 1279 | objd_set_private(list_objd, list); |
| 1280 | |
| 1281 | /* populate list by walking on all registered probes. */ |
| 1282 | ret = lttng_probes_get_field_list(list); |
| 1283 | if (ret) { |
| 1284 | goto list_error; |
| 1285 | } |
| 1286 | return list_objd; |
| 1287 | |
| 1288 | list_error: |
| 1289 | free(list); |
| 1290 | alloc_error: |
| 1291 | { |
| 1292 | int err; |
| 1293 | |
| 1294 | err = lttng_ust_abi_objd_unref(list_objd, 1); |
| 1295 | assert(!err); |
| 1296 | } |
| 1297 | objd_error: |
| 1298 | return ret; |
| 1299 | } |
| 1300 | |
| 1301 | static |
| 1302 | int lttng_release_tracepoint_field_list(int objd) |
| 1303 | { |
| 1304 | struct lttng_ust_field_list *list = objd_private(objd); |
| 1305 | |
| 1306 | if (list) { |
| 1307 | lttng_probes_prune_field_list(list); |
| 1308 | free(list); |
| 1309 | return 0; |
| 1310 | } else { |
| 1311 | return -EINVAL; |
| 1312 | } |
| 1313 | } |
| 1314 | |
| 1315 | static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops = { |
| 1316 | .release = lttng_release_tracepoint_field_list, |
| 1317 | .cmd = lttng_tracepoint_field_list_cmd, |
| 1318 | }; |
| 1319 | |
| 1320 | static |
| 1321 | int lttng_abi_map_stream(int channel_objd, struct lttng_ust_abi_stream *info, |
| 1322 | union lttng_ust_abi_args *uargs, void *owner __attribute__((unused))) |
| 1323 | { |
| 1324 | struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(channel_objd); |
| 1325 | int ret; |
| 1326 | |
| 1327 | ret = channel_handle_add_stream(lttng_chan_buf->priv->rb_chan->handle, |
| 1328 | uargs->stream.shm_fd, uargs->stream.wakeup_fd, |
| 1329 | info->stream_nr, info->len); |
| 1330 | if (ret) |
| 1331 | goto error_add_stream; |
| 1332 | /* Take ownership of shm_fd and wakeup_fd. */ |
| 1333 | uargs->stream.shm_fd = -1; |
| 1334 | uargs->stream.wakeup_fd = -1; |
| 1335 | |
| 1336 | return 0; |
| 1337 | |
| 1338 | error_add_stream: |
| 1339 | return ret; |
| 1340 | } |
| 1341 | |
| 1342 | static |
| 1343 | int lttng_abi_create_event_recorder_enabler(int channel_objd, |
| 1344 | struct lttng_ust_channel_buffer *channel, |
| 1345 | struct lttng_ust_abi_event *event_param, |
| 1346 | void *owner, |
| 1347 | enum lttng_enabler_format_type format_type) |
| 1348 | { |
| 1349 | struct lttng_event_recorder_enabler *enabler; |
| 1350 | int event_objd, ret; |
| 1351 | |
| 1352 | event_param->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
| 1353 | event_objd = objd_alloc(NULL, <tng_event_enabler_ops, owner, |
| 1354 | "event recorder enabler"); |
| 1355 | if (event_objd < 0) { |
| 1356 | ret = event_objd; |
| 1357 | goto objd_error; |
| 1358 | } |
| 1359 | /* |
| 1360 | * We tolerate no failure path after event creation. It will stay |
| 1361 | * invariant for the rest of the session. |
| 1362 | */ |
| 1363 | enabler = lttng_event_recorder_enabler_create(format_type, event_param, |
| 1364 | channel); |
| 1365 | if (!enabler) { |
| 1366 | ret = -ENOMEM; |
| 1367 | goto event_error; |
| 1368 | } |
| 1369 | objd_set_private(event_objd, &enabler->parent); |
| 1370 | /* The event holds a reference on the channel */ |
| 1371 | objd_ref(channel_objd); |
| 1372 | return event_objd; |
| 1373 | |
| 1374 | event_error: |
| 1375 | { |
| 1376 | int err; |
| 1377 | |
| 1378 | err = lttng_ust_abi_objd_unref(event_objd, 1); |
| 1379 | assert(!err); |
| 1380 | } |
| 1381 | objd_error: |
| 1382 | return ret; |
| 1383 | } |
| 1384 | |
| 1385 | static |
| 1386 | int copy_counter_key_dimension_tokens(const struct lttng_ust_abi_counter_key_dimension_tokens *abi_dim_tokens, |
| 1387 | const char *addr, size_t *offset, size_t arg_len, struct lttng_counter_key_dimension *internal_dim) |
| 1388 | { |
| 1389 | struct lttng_ust_abi_counter_key_dimension_tokens dim_tokens; |
| 1390 | size_t nr_key_tokens, j; |
| 1391 | int ret; |
| 1392 | |
| 1393 | if (abi_dim_tokens->parent.len < sizeof(struct lttng_ust_abi_counter_key_dimension_tokens)) |
| 1394 | return -EINVAL; |
| 1395 | ret = copy_abi_struct(&dim_tokens, sizeof(dim_tokens), abi_dim_tokens, abi_dim_tokens->parent.len); |
| 1396 | if (ret) |
| 1397 | return ret; |
| 1398 | nr_key_tokens = dim_tokens.nr_key_tokens; |
| 1399 | if (!nr_key_tokens || nr_key_tokens > LTTNG_NR_KEY_TOKEN) |
| 1400 | return -EINVAL; |
| 1401 | internal_dim->key_type = LTTNG_KEY_TYPE_TOKENS; |
| 1402 | internal_dim->u.tokens.nr_key_tokens = nr_key_tokens; |
| 1403 | *offset += sizeof(struct lttng_ust_abi_counter_key_dimension_tokens); |
| 1404 | for (j = 0; j < nr_key_tokens; j++) { |
| 1405 | struct lttng_key_token *internal_token = &internal_dim->u.tokens.key_tokens[j]; |
| 1406 | const struct lttng_ust_abi_key_token *abi_token; |
| 1407 | |
| 1408 | if (*offset + sizeof(struct lttng_ust_abi_key_token) > arg_len) |
| 1409 | return -EINVAL; |
| 1410 | abi_token = (const struct lttng_ust_abi_key_token *)(addr + *offset); |
| 1411 | if (abi_token->len < sizeof(struct lttng_ust_abi_key_token)) |
| 1412 | return -EINVAL; |
| 1413 | if (*offset + abi_token->len > arg_len) |
| 1414 | return -EINVAL; |
| 1415 | switch (abi_token->type) { |
| 1416 | case LTTNG_UST_ABI_KEY_TOKEN_STRING: |
| 1417 | { |
| 1418 | const struct lttng_ust_abi_key_token_string *abi_key_string; |
| 1419 | struct lttng_ust_abi_key_token_string token_string; |
| 1420 | |
| 1421 | if (abi_token->len < sizeof(struct lttng_ust_abi_key_token_string)) |
| 1422 | return -EINVAL; |
| 1423 | abi_key_string = (const struct lttng_ust_abi_key_token_string *)(addr + *offset); |
| 1424 | ret = copy_abi_struct(&token_string, sizeof(token_string), abi_key_string, abi_key_string->parent.len); |
| 1425 | if (ret) |
| 1426 | return ret; |
| 1427 | *offset += abi_key_string->parent.len; |
| 1428 | internal_token->type = LTTNG_KEY_TOKEN_STRING; |
| 1429 | if (!abi_key_string->string_len || abi_key_string->string_len > LTTNG_KEY_TOKEN_STRING_LEN_MAX) |
| 1430 | return -EINVAL; |
| 1431 | *offset += abi_key_string->string_len; |
| 1432 | if (*offset > arg_len) |
| 1433 | return -EINVAL; |
| 1434 | if (abi_key_string->str[abi_key_string->string_len - 1] != '\0' || |
| 1435 | strlen(abi_key_string->str) + 1 != abi_key_string->string_len) |
| 1436 | return -EINVAL; |
| 1437 | memcpy(internal_token->arg.string, abi_key_string->str, abi_key_string->string_len); |
| 1438 | break; |
| 1439 | } |
| 1440 | case LTTNG_UST_ABI_KEY_TOKEN_EVENT_NAME: |
| 1441 | internal_token->type = LTTNG_KEY_TOKEN_EVENT_NAME; |
| 1442 | *offset += abi_token->len; |
| 1443 | break; |
| 1444 | case LTTNG_UST_ABI_KEY_TOKEN_PROVIDER_NAME: |
| 1445 | internal_token->type = LTTNG_KEY_TOKEN_PROVIDER_NAME; |
| 1446 | *offset += abi_token->len; |
| 1447 | break; |
| 1448 | default: |
| 1449 | return -EINVAL; |
| 1450 | } |
| 1451 | } |
| 1452 | return 0; |
| 1453 | } |
| 1454 | |
| 1455 | static |
| 1456 | int copy_counter_key(struct lttng_counter_key *internal_key, |
| 1457 | unsigned long arg, size_t action_fields_len, size_t arg_len, |
| 1458 | const struct lttng_ust_abi_counter_event *counter_event) |
| 1459 | { |
| 1460 | size_t i, nr_dimensions, offset = 0; |
| 1461 | const char *addr = (const char *)arg; |
| 1462 | int ret; |
| 1463 | |
| 1464 | nr_dimensions = counter_event->number_key_dimensions; |
| 1465 | if (nr_dimensions != 1) |
| 1466 | return -EINVAL; |
| 1467 | internal_key->nr_dimensions = nr_dimensions; |
| 1468 | offset += counter_event->len + action_fields_len; |
| 1469 | for (i = 0; i < nr_dimensions; i++) { |
| 1470 | struct lttng_counter_key_dimension *internal_dim = &internal_key->key_dimensions[i]; |
| 1471 | const struct lttng_ust_abi_counter_key_dimension *abi_dim; |
| 1472 | |
| 1473 | abi_dim = (const struct lttng_ust_abi_counter_key_dimension *)(addr + offset); |
| 1474 | if (offset + abi_dim->len > arg_len || abi_dim->len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_key_dimension, key_type)) |
| 1475 | return -EINVAL; |
| 1476 | switch (abi_dim->key_type) { |
| 1477 | case LTTNG_UST_ABI_KEY_TYPE_TOKENS: |
| 1478 | { |
| 1479 | struct lttng_ust_abi_counter_key_dimension_tokens *dim_tokens = |
| 1480 | caa_container_of(abi_dim, struct lttng_ust_abi_counter_key_dimension_tokens, parent); |
| 1481 | ret = copy_counter_key_dimension_tokens(dim_tokens, addr, &offset, arg_len, |
| 1482 | internal_dim); |
| 1483 | if (ret) |
| 1484 | return ret; |
| 1485 | break; |
| 1486 | } |
| 1487 | default: |
| 1488 | return -EINVAL; |
| 1489 | } |
| 1490 | } |
| 1491 | return 0; |
| 1492 | } |
| 1493 | |
| 1494 | static |
| 1495 | int lttng_abi_create_event_counter_enabler(int channel_objd, |
| 1496 | struct lttng_ust_channel_counter *channel, |
| 1497 | unsigned long arg, size_t arg_len, void *owner) |
| 1498 | { |
| 1499 | struct lttng_ust_abi_counter_event *abi_counter_event = (struct lttng_ust_abi_counter_event *)arg; |
| 1500 | struct lttng_ust_abi_counter_event counter_event = {}; |
| 1501 | struct lttng_counter_key counter_key = {}; |
| 1502 | struct lttng_event_counter_enabler *enabler; |
| 1503 | enum lttng_enabler_format_type format_type; |
| 1504 | size_t action_fields_len = 0; |
| 1505 | int event_objd, ret; |
| 1506 | size_t i; |
| 1507 | |
| 1508 | if (arg_len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_event, number_key_dimensions)) { |
| 1509 | return -EINVAL; |
| 1510 | } |
| 1511 | if (arg_len < abi_counter_event->len || |
| 1512 | abi_counter_event->len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_event, number_key_dimensions)) { |
| 1513 | return -EINVAL; |
| 1514 | } |
| 1515 | ret = copy_abi_struct(&counter_event, sizeof(counter_event), |
| 1516 | abi_counter_event, abi_counter_event->len); |
| 1517 | if (ret) { |
| 1518 | return ret; |
| 1519 | } |
| 1520 | switch (counter_event.action) { |
| 1521 | case LTTNG_UST_ABI_COUNTER_ACTION_INCREMENT: |
| 1522 | /* No additional fields specific to this action. */ |
| 1523 | break; |
| 1524 | default: |
| 1525 | return -EINVAL; |
| 1526 | } |
| 1527 | counter_event.event.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0'; |
| 1528 | if (strutils_is_star_glob_pattern(counter_event.event.name)) { |
| 1529 | format_type = LTTNG_ENABLER_FORMAT_STAR_GLOB; |
| 1530 | } else { |
| 1531 | format_type = LTTNG_ENABLER_FORMAT_EVENT; |
| 1532 | } |
| 1533 | ret = copy_counter_key(&counter_key, arg, action_fields_len, arg_len, &counter_event); |
| 1534 | if (ret) { |
| 1535 | return ret; |
| 1536 | } |
| 1537 | /* |
| 1538 | * Validate that each dimension counter key type match the map |
| 1539 | * key type. |
| 1540 | */ |
| 1541 | for (i = 0; i < counter_key.nr_dimensions; i++) { |
| 1542 | if (channel->priv->dimension_key_types[i] != counter_key.key_dimensions[i].key_type) |
| 1543 | return -EINVAL; |
| 1544 | } |
| 1545 | event_objd = objd_alloc(NULL, <tng_event_enabler_ops, owner, |
| 1546 | "event enabler"); |
| 1547 | if (event_objd < 0) { |
| 1548 | ret = event_objd; |
| 1549 | goto objd_error; |
| 1550 | } |
| 1551 | /* |
| 1552 | * We tolerate no failure path after event creation. It will stay |
| 1553 | * invariant for the rest of the session. |
| 1554 | */ |
| 1555 | enabler = lttng_event_counter_enabler_create(format_type, &counter_event, &counter_key, channel); |
| 1556 | if (!enabler) { |
| 1557 | ret = -ENOMEM; |
| 1558 | goto event_error; |
| 1559 | } |
| 1560 | objd_set_private(event_objd, &enabler->parent); |
| 1561 | /* The event holds a reference on the channel */ |
| 1562 | objd_ref(channel_objd); |
| 1563 | return event_objd; |
| 1564 | |
| 1565 | event_error: |
| 1566 | { |
| 1567 | int err; |
| 1568 | |
| 1569 | err = lttng_ust_abi_objd_unref(event_objd, 1); |
| 1570 | assert(!err); |
| 1571 | } |
| 1572 | objd_error: |
| 1573 | return ret; |
| 1574 | } |
| 1575 | |
| 1576 | /** |
| 1577 | * lttng_channel_cmd - lttng control through object descriptors |
| 1578 | * |
| 1579 | * @objd: the object descriptor |
| 1580 | * @cmd: the command |
| 1581 | * @arg: command arg |
| 1582 | * @uargs: UST arguments (internal) |
| 1583 | * @owner: objd owner |
| 1584 | * |
| 1585 | * This object descriptor implements lttng commands: |
| 1586 | * LTTNG_UST_ABI_STREAM |
| 1587 | * Returns an event stream object descriptor or failure. |
| 1588 | * (typically, one event stream records events from one CPU) |
| 1589 | * LTTNG_UST_ABI_EVENT |
| 1590 | * Returns an event object descriptor or failure. |
| 1591 | * LTTNG_UST_ABI_CONTEXT |
| 1592 | * Prepend a context field to each event in the channel |
| 1593 | * LTTNG_UST_ABI_ENABLE |
| 1594 | * Enable recording for events in this channel (weak enable) |
| 1595 | * LTTNG_UST_ABI_DISABLE |
| 1596 | * Disable recording for events in this channel (strong disable) |
| 1597 | * |
| 1598 | * Channel and event file descriptors also hold a reference on the session. |
| 1599 | */ |
| 1600 | static |
| 1601 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 1602 | union lttng_ust_abi_args *uargs, void *owner) |
| 1603 | { |
| 1604 | struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(objd); |
| 1605 | |
| 1606 | if (cmd != LTTNG_UST_ABI_STREAM) { |
| 1607 | /* |
| 1608 | * Check if channel received all streams. |
| 1609 | */ |
| 1610 | if (!lttng_is_channel_ready(lttng_chan_buf)) |
| 1611 | return -EPERM; |
| 1612 | } |
| 1613 | |
| 1614 | switch (cmd) { |
| 1615 | case LTTNG_UST_ABI_STREAM: |
| 1616 | { |
| 1617 | struct lttng_ust_abi_stream *stream; |
| 1618 | |
| 1619 | stream = (struct lttng_ust_abi_stream *) arg; |
| 1620 | /* stream used as output */ |
| 1621 | return lttng_abi_map_stream(objd, stream, uargs, owner); |
| 1622 | } |
| 1623 | case LTTNG_UST_ABI_EVENT: |
| 1624 | { |
| 1625 | struct lttng_ust_abi_event *event_param = |
| 1626 | (struct lttng_ust_abi_event *) arg; |
| 1627 | |
| 1628 | if (strutils_is_star_glob_pattern(event_param->name)) { |
| 1629 | /* |
| 1630 | * If the event name is a star globbing pattern, |
| 1631 | * we create the special star globbing enabler. |
| 1632 | */ |
| 1633 | return lttng_abi_create_event_recorder_enabler(objd, lttng_chan_buf, |
| 1634 | event_param, owner, |
| 1635 | LTTNG_ENABLER_FORMAT_STAR_GLOB); |
| 1636 | } else { |
| 1637 | return lttng_abi_create_event_recorder_enabler(objd, lttng_chan_buf, |
| 1638 | event_param, owner, |
| 1639 | LTTNG_ENABLER_FORMAT_EVENT); |
| 1640 | } |
| 1641 | } |
| 1642 | case LTTNG_UST_ABI_CONTEXT: |
| 1643 | return lttng_abi_add_context(objd, |
| 1644 | (struct lttng_ust_abi_context *) arg, uargs, |
| 1645 | <tng_chan_buf->priv->ctx, |
| 1646 | lttng_chan_buf->parent->session); |
| 1647 | case LTTNG_UST_ABI_ENABLE: |
| 1648 | return lttng_channel_enable(lttng_chan_buf->parent); |
| 1649 | case LTTNG_UST_ABI_DISABLE: |
| 1650 | return lttng_channel_disable(lttng_chan_buf->parent); |
| 1651 | case LTTNG_UST_ABI_FLUSH_BUFFER: |
| 1652 | return lttng_chan_buf->ops->priv->flush_buffer(lttng_chan_buf); |
| 1653 | default: |
| 1654 | return -EINVAL; |
| 1655 | } |
| 1656 | } |
| 1657 | |
| 1658 | static |
| 1659 | int lttng_channel_release(int objd) |
| 1660 | { |
| 1661 | struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(objd); |
| 1662 | |
| 1663 | if (lttng_chan_buf) |
| 1664 | return lttng_ust_abi_objd_unref(lttng_chan_buf->parent->session->priv->objd, 0); |
| 1665 | return 0; |
| 1666 | } |
| 1667 | |
| 1668 | static const struct lttng_ust_abi_objd_ops lttng_channel_ops = { |
| 1669 | .release = lttng_channel_release, |
| 1670 | .cmd = lttng_channel_cmd, |
| 1671 | }; |
| 1672 | |
| 1673 | /** |
| 1674 | * lttng_counter_cmd - lttng control through object descriptors |
| 1675 | * |
| 1676 | * @objd: the object descriptor |
| 1677 | * @cmd: the command |
| 1678 | * @arg: command arg |
| 1679 | * @uargs: UST arguments (internal) |
| 1680 | * @owner: objd owner |
| 1681 | * |
| 1682 | * This object descriptor implements lttng commands: |
| 1683 | * LTTNG_UST_ABI_COUNTER_GLOBAL: |
| 1684 | * Returns a global counter object descriptor or failure. |
| 1685 | * LTTNG_UST_ABI_COUNTER_CPU: |
| 1686 | * Returns a per-cpu counter object descriptor or failure. |
| 1687 | * LTTNG_UST_ABI_COUNTER_EVENT |
| 1688 | * Returns an event object descriptor or failure. |
| 1689 | * LTTNG_UST_ABI_ENABLE |
| 1690 | * Enable recording for events in this channel (weak enable) |
| 1691 | * LTTNG_UST_ABI_DISABLE |
| 1692 | * Disable recording for events in this channel (strong disable) |
| 1693 | * |
| 1694 | * Counter and event object descriptors also hold a reference on the session. |
| 1695 | */ |
| 1696 | static |
| 1697 | long lttng_counter_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 1698 | union lttng_ust_abi_args *uargs, void *owner) |
| 1699 | { |
| 1700 | struct lttng_ust_channel_counter *counter = objd_private(objd); |
| 1701 | |
| 1702 | if (cmd != LTTNG_UST_ABI_COUNTER_GLOBAL && cmd != LTTNG_UST_ABI_COUNTER_CPU) { |
| 1703 | /* |
| 1704 | * Check if counter received all global/per-cpu objects. |
| 1705 | */ |
| 1706 | if (!lttng_counter_ready(counter->priv->counter)) |
| 1707 | return -EPERM; |
| 1708 | } |
| 1709 | |
| 1710 | switch (cmd) { |
| 1711 | case LTTNG_UST_ABI_COUNTER_GLOBAL: |
| 1712 | { |
| 1713 | struct lttng_ust_abi_counter_global *abi_counter_global = |
| 1714 | (struct lttng_ust_abi_counter_global *) arg; |
| 1715 | struct lttng_ust_abi_counter_global counter_global; |
| 1716 | long ret; |
| 1717 | int shm_fd; |
| 1718 | |
| 1719 | if (uargs->counter_shm.len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_global, shm_len)) |
| 1720 | return -EINVAL; |
| 1721 | if (abi_counter_global->len > uargs->counter_shm.len || |
| 1722 | abi_counter_global->len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_global, shm_len)) { |
| 1723 | return -EINVAL; |
| 1724 | } |
| 1725 | ret = copy_abi_struct(&counter_global, sizeof(counter_global), |
| 1726 | abi_counter_global, abi_counter_global->len); |
| 1727 | if (ret) |
| 1728 | return ret; |
| 1729 | shm_fd = uargs->counter_shm.shm_fd; |
| 1730 | ret = lttng_counter_set_global_shm(counter->priv->counter, shm_fd); |
| 1731 | if (!ret) { |
| 1732 | /* Take ownership of shm_fd. */ |
| 1733 | uargs->counter_shm.shm_fd = -1; |
| 1734 | } |
| 1735 | return ret; |
| 1736 | } |
| 1737 | case LTTNG_UST_ABI_COUNTER_CPU: |
| 1738 | { |
| 1739 | struct lttng_ust_abi_counter_cpu *abi_counter_cpu = |
| 1740 | (struct lttng_ust_abi_counter_cpu *) arg; |
| 1741 | struct lttng_ust_abi_counter_cpu counter_cpu; |
| 1742 | long ret; |
| 1743 | int shm_fd; |
| 1744 | |
| 1745 | if (uargs->counter_shm.len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_cpu, cpu_nr)) |
| 1746 | return -EINVAL; |
| 1747 | if (abi_counter_cpu->len > uargs->counter_shm.len || |
| 1748 | abi_counter_cpu->len < lttng_ust_offsetofend(struct lttng_ust_abi_counter_cpu, cpu_nr)) { |
| 1749 | return -EINVAL; |
| 1750 | } |
| 1751 | ret = copy_abi_struct(&counter_cpu, sizeof(counter_cpu), |
| 1752 | abi_counter_cpu, abi_counter_cpu->len); |
| 1753 | if (ret) |
| 1754 | return ret; |
| 1755 | shm_fd = uargs->counter_shm.shm_fd; |
| 1756 | ret = lttng_counter_set_cpu_shm(counter->priv->counter, |
| 1757 | counter_cpu.cpu_nr, shm_fd); |
| 1758 | if (!ret) { |
| 1759 | /* Take ownership of shm_fd. */ |
| 1760 | uargs->counter_shm.shm_fd = -1; |
| 1761 | } |
| 1762 | return ret; |
| 1763 | } |
| 1764 | case LTTNG_UST_ABI_COUNTER_EVENT: |
| 1765 | { |
| 1766 | return lttng_abi_create_event_counter_enabler(objd, counter, |
| 1767 | arg, uargs->counter_event.len, owner); |
| 1768 | } |
| 1769 | case LTTNG_UST_ABI_ENABLE: |
| 1770 | return lttng_channel_enable(counter->parent); |
| 1771 | case LTTNG_UST_ABI_DISABLE: |
| 1772 | return lttng_channel_disable(counter->parent); |
| 1773 | default: |
| 1774 | return -EINVAL; |
| 1775 | } |
| 1776 | } |
| 1777 | |
| 1778 | static |
| 1779 | int lttng_counter_release(int objd) |
| 1780 | { |
| 1781 | struct lttng_ust_channel_counter *counter = objd_private(objd); |
| 1782 | |
| 1783 | if (counter) { |
| 1784 | return lttng_ust_abi_objd_unref(counter->parent->session->priv->objd, 0); |
| 1785 | } |
| 1786 | return 0; |
| 1787 | } |
| 1788 | |
| 1789 | static const struct lttng_ust_abi_objd_ops lttng_counter_ops = { |
| 1790 | .release = lttng_counter_release, |
| 1791 | .cmd = lttng_counter_cmd, |
| 1792 | }; |
| 1793 | |
| 1794 | /** |
| 1795 | * lttng_enabler_cmd - lttng control through object descriptors |
| 1796 | * |
| 1797 | * @objd: the object descriptor |
| 1798 | * @cmd: the command |
| 1799 | * @arg: command arg |
| 1800 | * @uargs: UST arguments (internal) |
| 1801 | * @owner: objd owner |
| 1802 | * |
| 1803 | * This object descriptor implements lttng commands: |
| 1804 | * LTTNG_UST_ABI_CONTEXT |
| 1805 | * Prepend a context field to each record of events of this |
| 1806 | * enabler. |
| 1807 | * LTTNG_UST_ABI_ENABLE |
| 1808 | * Enable recording for this enabler |
| 1809 | * LTTNG_UST_ABI_DISABLE |
| 1810 | * Disable recording for this enabler |
| 1811 | * LTTNG_UST_ABI_FILTER |
| 1812 | * Attach a filter to an enabler. |
| 1813 | * LTTNG_UST_ABI_EXCLUSION |
| 1814 | * Attach exclusions to an enabler. |
| 1815 | */ |
| 1816 | static |
| 1817 | long lttng_event_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
| 1818 | union lttng_ust_abi_args *uargs __attribute__((unused)), |
| 1819 | void *owner __attribute__((unused))) |
| 1820 | { |
| 1821 | struct lttng_event_enabler_session_common *enabler = objd_private(objd); |
| 1822 | |
| 1823 | switch (cmd) { |
| 1824 | case LTTNG_UST_ABI_CONTEXT: |
| 1825 | return lttng_event_enabler_attach_context(enabler, |
| 1826 | (struct lttng_ust_abi_context *) arg); |
| 1827 | case LTTNG_UST_ABI_ENABLE: |
| 1828 | return lttng_event_enabler_enable(&enabler->parent); |
| 1829 | case LTTNG_UST_ABI_DISABLE: |
| 1830 | return lttng_event_enabler_disable(&enabler->parent); |
| 1831 | case LTTNG_UST_ABI_FILTER: |
| 1832 | { |
| 1833 | int ret; |
| 1834 | |
| 1835 | ret = lttng_event_enabler_attach_filter_bytecode(&enabler->parent, |
| 1836 | (struct lttng_ust_bytecode_node **) arg); |
| 1837 | if (ret) |
| 1838 | return ret; |
| 1839 | return 0; |
| 1840 | } |
| 1841 | case LTTNG_UST_ABI_EXCLUSION: |
| 1842 | { |
| 1843 | return lttng_event_enabler_attach_exclusion(&enabler->parent, |
| 1844 | (struct lttng_ust_excluder_node **) arg); |
| 1845 | } |
| 1846 | default: |
| 1847 | return -EINVAL; |
| 1848 | } |
| 1849 | } |
| 1850 | |
| 1851 | static |
| 1852 | int lttng_event_enabler_release(int objd) |
| 1853 | { |
| 1854 | struct lttng_event_recorder_enabler *event_enabler = objd_private(objd); |
| 1855 | |
| 1856 | if (event_enabler) |
| 1857 | return lttng_ust_abi_objd_unref(event_enabler->chan->priv->parent.objd, 0); |
| 1858 | |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
| 1862 | static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops = { |
| 1863 | .release = lttng_event_enabler_release, |
| 1864 | .cmd = lttng_event_enabler_cmd, |
| 1865 | }; |
| 1866 | |
| 1867 | void lttng_ust_abi_exit(void) |
| 1868 | { |
| 1869 | lttng_ust_abi_close_in_progress = 1; |
| 1870 | ust_lock_nocheck(); |
| 1871 | objd_table_destroy(); |
| 1872 | ust_unlock(); |
| 1873 | lttng_ust_abi_close_in_progress = 0; |
| 1874 | } |