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sys/dev/bhnd/nvram/bhnd_nvram_store.c
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1 /*- 2 * Copyright (c) 2015-2016 Landon Fuller <landonf@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer, 10 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 13 * redistribution must be conditioned upon including a substantially 14 * similar Disclaimer requirement for further binary redistribution. 15 * 16 * NO WARRANTY 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGES. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/hash.h> 35 #include <sys/limits.h> 36 #include <sys/queue.h> 37 38 #ifdef _KERNEL 39 40 #include <sys/ctype.h> 41 #include <sys/systm.h> 42 43 #include <machine/_inttypes.h> 44 45 #else /* !_KERNEL */ 46 47 #include <ctype.h> 48 #include <errno.h> 49 #include <inttypes.h> 50 #include <stdbool.h> 51 #include <stdio.h> 52 #include <stdint.h> 53 #include <stdlib.h> 54 #include <string.h> 55 56 #endif /* _KERNEL */ 57 58 #include "bhnd_nvram_private.h" 59 #include "bhnd_nvram_datavar.h" 60 61 #include "bhnd_nvram_storevar.h" 62 63 /* 64 * BHND NVRAM Store 65 * 66 * Manages in-memory and persistent representations of NVRAM data. 67 */ 68 69 static int bhnd_nvstore_parse_data( 70 struct bhnd_nvram_store *sc); 71 72 static int bhnd_nvstore_parse_path_entries( 73 struct bhnd_nvram_store *sc); 74 75 static int bhnd_nvram_store_export_child( 76 struct bhnd_nvram_store *sc, 77 bhnd_nvstore_path *top, 78 bhnd_nvstore_path *child, 79 bhnd_nvram_plist *plist, 80 uint32_t flags); 81 82 static int bhnd_nvstore_export_merge( 83 struct bhnd_nvram_store *sc, 84 bhnd_nvstore_path *path, 85 bhnd_nvram_plist *merged, 86 uint32_t flags); 87 88 static int bhnd_nvstore_export_devpath_alias( 89 struct bhnd_nvram_store *sc, 90 bhnd_nvstore_path *path, 91 const char *devpath, 92 bhnd_nvram_plist *plist, 93 u_long *alias_val); 94 95 /** 96 * Allocate and initialize a new NVRAM data store instance. 97 * 98 * The caller is responsible for deallocating the instance via 99 * bhnd_nvram_store_free(). 100 * 101 * @param[out] store On success, a pointer to the newly allocated NVRAM data 102 * instance. 103 * @param data The NVRAM data to be managed by the returned NVRAM data store 104 * instance. 105 * 106 * @retval 0 success 107 * @retval non-zero if an error occurs during allocation or initialization, a 108 * regular unix error code will be returned. 109 */ 110 int 111 bhnd_nvram_store_new(struct bhnd_nvram_store **store, 112 struct bhnd_nvram_data *data) 113 { 114 struct bhnd_nvram_store *sc; 115 int error; 116 117 /* Allocate new instance */ 118 sc = bhnd_nv_calloc(1, sizeof(*sc)); 119 if (sc == NULL) 120 return (ENOMEM); 121 122 BHND_NVSTORE_LOCK_INIT(sc); 123 BHND_NVSTORE_LOCK(sc); 124 125 /* Initialize path hash table */ 126 sc->num_paths = 0; 127 for (size_t i = 0; i < nitems(sc->paths); i++) 128 LIST_INIT(&sc->paths[i]); 129 130 /* Initialize alias hash table */ 131 sc->num_aliases = 0; 132 for (size_t i = 0; i < nitems(sc->aliases); i++) 133 LIST_INIT(&sc->aliases[i]); 134 135 /* Retain the NVRAM data */ 136 sc->data = bhnd_nvram_data_retain(data); 137 sc->data_caps = bhnd_nvram_data_caps(data); 138 sc->data_opts = bhnd_nvram_data_options(data); 139 if (sc->data_opts != NULL) { 140 bhnd_nvram_plist_retain(sc->data_opts); 141 } else { 142 sc->data_opts = bhnd_nvram_plist_new(); 143 if (sc->data_opts == NULL) { 144 error = ENOMEM; 145 goto cleanup; 146 } 147 } 148 149 /* Register required root path */ 150 error = bhnd_nvstore_register_path(sc, BHND_NVSTORE_ROOT_PATH, 151 BHND_NVSTORE_ROOT_PATH_LEN); 152 if (error) 153 goto cleanup; 154 155 sc->root_path = bhnd_nvstore_get_path(sc, BHND_NVSTORE_ROOT_PATH, 156 BHND_NVSTORE_ROOT_PATH_LEN); 157 BHND_NV_ASSERT(sc->root_path, ("missing root path")); 158 159 /* Parse all variables vended by our backing NVRAM data instance, 160 * generating all path entries, alias entries, and variable indexes */ 161 if ((error = bhnd_nvstore_parse_data(sc))) 162 goto cleanup; 163 164 *store = sc; 165 166 BHND_NVSTORE_UNLOCK(sc); 167 return (0); 168 169 cleanup: 170 BHND_NVSTORE_UNLOCK(sc); 171 bhnd_nvram_store_free(sc); 172 return (error); 173 } 174 175 /** 176 * Allocate and initialize a new NVRAM data store instance, parsing the 177 * NVRAM data from @p io. 178 * 179 * The caller is responsible for deallocating the instance via 180 * bhnd_nvram_store_free(). 181 * 182 * The NVRAM data mapped by @p io will be copied, and @p io may be safely 183 * deallocated after bhnd_nvram_store_new() returns. 184 * 185 * @param[out] store On success, a pointer to the newly allocated NVRAM data 186 * instance. 187 * @param io An I/O context mapping the NVRAM data to be copied and parsed. 188 * @param cls The NVRAM data class to be used when parsing @p io, or NULL 189 * to perform runtime identification of the appropriate data class. 190 * 191 * @retval 0 success 192 * @retval non-zero if an error occurs during allocation or initialization, a 193 * regular unix error code will be returned. 194 */ 195 int 196 bhnd_nvram_store_parse_new(struct bhnd_nvram_store **store, 197 struct bhnd_nvram_io *io, bhnd_nvram_data_class *cls) 198 { 199 struct bhnd_nvram_data *data; 200 int error; 201 202 /* Try to parse the data */ 203 if ((error = bhnd_nvram_data_new(cls, &data, io))) 204 return (error); 205 206 /* Try to create our new store instance */ 207 error = bhnd_nvram_store_new(store, data); 208 bhnd_nvram_data_release(data); 209 210 return (error); 211 } 212 213 /** 214 * Free an NVRAM store instance, releasing all associated resources. 215 * 216 * @param sc A store instance previously allocated via 217 * bhnd_nvram_store_new(). 218 */ 219 void 220 bhnd_nvram_store_free(struct bhnd_nvram_store *sc) 221 { 222 223 /* Clean up alias hash table */ 224 for (size_t i = 0; i < nitems(sc->aliases); i++) { 225 bhnd_nvstore_alias *alias, *anext; 226 LIST_FOREACH_SAFE(alias, &sc->aliases[i], na_link, anext) 227 bhnd_nv_free(alias); 228 } 229 230 /* Clean up path hash table */ 231 for (size_t i = 0; i < nitems(sc->paths); i++) { 232 bhnd_nvstore_path *path, *pnext; 233 LIST_FOREACH_SAFE(path, &sc->paths[i], np_link, pnext) 234 bhnd_nvstore_path_free(path); 235 } 236 237 if (sc->data != NULL) 238 bhnd_nvram_data_release(sc->data); 239 240 if (sc->data_opts != NULL) 241 bhnd_nvram_plist_release(sc->data_opts); 242 243 BHND_NVSTORE_LOCK_DESTROY(sc); 244 bhnd_nv_free(sc); 245 } 246 247 /** 248 * Parse all variables vended by our backing NVRAM data instance, 249 * generating all path entries, alias entries, and variable indexes. 250 * 251 * @param sc The NVRAM store instance to be initialized with 252 * paths, aliases, and data parsed from its backing 253 * data. 254 * 255 * @retval 0 success 256 * @retval non-zero if an error occurs during parsing, a regular unix error 257 * code will be returned. 258 */ 259 static int 260 bhnd_nvstore_parse_data(struct bhnd_nvram_store *sc) 261 { 262 const char *name; 263 void *cookiep; 264 int error; 265 266 /* Parse and register all device paths and path aliases. This enables 267 * resolution of _forward_ references to device paths aliases when 268 * scanning variable entries below */ 269 if ((error = bhnd_nvstore_parse_path_entries(sc))) 270 return (error); 271 272 /* Calculate the per-path variable counts, and report dangling alias 273 * references as an error. */ 274 cookiep = NULL; 275 while ((name = bhnd_nvram_data_next(sc->data, &cookiep))) { 276 bhnd_nvstore_path *path; 277 bhnd_nvstore_name_info info; 278 279 /* Parse the name info */ 280 error = bhnd_nvstore_parse_name_info(name, 281 BHND_NVSTORE_NAME_INTERNAL, sc->data_caps, &info); 282 if (error) 283 return (error); 284 285 switch (info.type) { 286 case BHND_NVSTORE_VAR: 287 /* Fetch referenced path */ 288 path = bhnd_nvstore_var_get_path(sc, &info); 289 if (path == NULL) { 290 BHND_NV_LOG("variable '%s' has dangling " 291 "path reference\n", name); 292 return (EFTYPE); 293 } 294 295 /* Increment path variable count */ 296 if (path->num_vars == SIZE_MAX) { 297 BHND_NV_LOG("more than SIZE_MAX variables in " 298 "path %s\n", path->path_str); 299 return (EFTYPE); 300 } 301 path->num_vars++; 302 break; 303 304 case BHND_NVSTORE_ALIAS_DECL: 305 /* Skip -- path alias already parsed and recorded */ 306 break; 307 } 308 } 309 310 /* If the backing NVRAM data instance vends only a single root ("/") 311 * path, we may be able to skip generating an index for the root 312 * path */ 313 if (sc->num_paths == 1) { 314 bhnd_nvstore_path *path; 315 316 /* If the backing instance provides its own name-based lookup 317 * indexing, we can skip generating a duplicate here */ 318 if (sc->data_caps & BHND_NVRAM_DATA_CAP_INDEXED) 319 return (0); 320 321 /* If the sole root path contains fewer variables than the 322 * minimum indexing threshhold, we do not need to generate an 323 * index */ 324 path = bhnd_nvstore_get_root_path(sc); 325 if (path->num_vars < BHND_NV_IDX_VAR_THRESHOLD) 326 return (0); 327 } 328 329 /* Allocate per-path index instances */ 330 for (size_t i = 0; i < nitems(sc->paths); i++) { 331 bhnd_nvstore_path *path; 332 333 LIST_FOREACH(path, &sc->paths[i], np_link) { 334 path->index = bhnd_nvstore_index_new(path->num_vars); 335 if (path->index == NULL) 336 return (ENOMEM); 337 } 338 } 339 340 /* Populate per-path indexes */ 341 cookiep = NULL; 342 while ((name = bhnd_nvram_data_next(sc->data, &cookiep))) { 343 bhnd_nvstore_name_info info; 344 bhnd_nvstore_path *path; 345 346 /* Parse the name info */ 347 error = bhnd_nvstore_parse_name_info(name, 348 BHND_NVSTORE_NAME_INTERNAL, sc->data_caps, &info); 349 if (error) 350 return (error); 351 352 switch (info.type) { 353 case BHND_NVSTORE_VAR: 354 /* Fetch referenced path */ 355 path = bhnd_nvstore_var_get_path(sc, &info); 356 BHND_NV_ASSERT(path != NULL, 357 ("dangling path reference")); 358 359 /* Append to index */ 360 error = bhnd_nvstore_index_append(sc, path->index, 361 cookiep); 362 if (error) 363 return (error); 364 break; 365 366 case BHND_NVSTORE_ALIAS_DECL: 367 /* Skip */ 368 break; 369 } 370 } 371 372 /* Prepare indexes for querying */ 373 for (size_t i = 0; i < nitems(sc->paths); i++) { 374 bhnd_nvstore_path *path; 375 376 LIST_FOREACH(path, &sc->paths[i], np_link) { 377 error = bhnd_nvstore_index_prepare(sc, path->index); 378 if (error) 379 return (error); 380 } 381 } 382 383 return (0); 384 } 385 386 /** 387 * Parse and register path and path alias entries for all declarations found in 388 * the NVRAM data backing @p nvram. 389 * 390 * @param sc The NVRAM store instance. 391 * 392 * @retval 0 success 393 * @retval non-zero If parsing fails, a regular unix error code will be 394 * returned. 395 */ 396 static int 397 bhnd_nvstore_parse_path_entries(struct bhnd_nvram_store *sc) 398 { 399 const char *name; 400 void *cookiep; 401 int error; 402 403 BHND_NVSTORE_LOCK_ASSERT(sc, MA_OWNED); 404 405 /* Skip path registration if the data source does not support device 406 * paths. */ 407 if (!(sc->data_caps & BHND_NVRAM_DATA_CAP_DEVPATHS)) { 408 BHND_NV_ASSERT(sc->root_path != NULL, ("missing root path")); 409 return (0); 410 } 411 412 /* Otherwise, parse and register all paths and path aliases */ 413 cookiep = NULL; 414 while ((name = bhnd_nvram_data_next(sc->data, &cookiep))) { 415 bhnd_nvstore_name_info info; 416 417 /* Parse the name info */ 418 error = bhnd_nvstore_parse_name_info(name, 419 BHND_NVSTORE_NAME_INTERNAL, sc->data_caps, &info); 420 if (error) 421 return (error); 422 423 /* Register the path */ 424 error = bhnd_nvstore_var_register_path(sc, &info, cookiep); 425 if (error) { 426 BHND_NV_LOG("failed to register path for %s: %d\n", 427 name, error); 428 return (error); 429 } 430 } 431 432 return (0); 433 } 434 435 /** 436 * Merge exported per-path variables (uncommitted, committed, or both) into 437 * the empty @p merged property list. 438 * 439 * @param sc The NVRAM store instance. 440 * @param path The NVRAM path to be exported. 441 * @param merged The property list to populate with the merged results. 442 * @param flags Export flags. See BHND_NVSTORE_EXPORT_*. 443 * 444 * @retval 0 success 445 * @retval ENOMEM If allocation fails. 446 * @retval non-zero If merging the variables defined in @p path otherwise 447 * fails, a regular unix error code will be returned. 448 */ 449 static int 450 bhnd_nvstore_export_merge(struct bhnd_nvram_store *sc, 451 bhnd_nvstore_path *path, bhnd_nvram_plist *merged, uint32_t flags) 452 { 453 void *cookiep, *idxp; 454 int error; 455 456 /* Populate merged list with all pending variables */ 457 if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_UNCOMMITTED)) { 458 bhnd_nvram_prop *prop; 459 460 prop = NULL; 461 while ((prop = bhnd_nvram_plist_next(path->pending, prop))) { 462 /* Skip variables marked for deletion */ 463 if (!BHND_NVSTORE_GET_FLAG(flags, EXPORT_DELETED)) { 464 if (bhnd_nvram_prop_is_null(prop)) 465 continue; 466 } 467 468 /* Append to merged list */ 469 error = bhnd_nvram_plist_append(merged, prop); 470 if (error) 471 return (error); 472 } 473 } 474 475 /* Skip merging committed variables? */ 476 if (!BHND_NVSTORE_GET_FLAG(flags, EXPORT_COMMITTED)) 477 return (0); 478 479 /* Merge in the committed NVRAM variables */ 480 idxp = NULL; 481 while ((cookiep = bhnd_nvstore_path_data_next(sc, path, &idxp))) { 482 const char *name; 483 bhnd_nvram_val *val; 484 485 /* Fetch the variable name */ 486 name = bhnd_nvram_data_getvar_name(sc->data, cookiep); 487 488 /* Trim device path prefix */ 489 if (sc->data_caps & BHND_NVRAM_DATA_CAP_DEVPATHS) 490 name = bhnd_nvram_trim_path_name(name); 491 492 /* Skip if already defined in pending updates */ 493 if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_UNCOMMITTED)) { 494 if (bhnd_nvram_plist_contains(path->pending, name)) 495 continue; 496 } 497 498 /* Skip if higher precedence value was already defined. This 499 * may occur if the underlying data store contains duplicate 500 * keys; iteration will always return the definition with 501 * the highest precedence first */ 502 if (bhnd_nvram_plist_contains(merged, name)) 503 continue; 504 505 /* Fetch the variable's value representation */ 506 if ((error = bhnd_nvram_data_copy_val(sc->data, cookiep, &val))) 507 return (error); 508 509 /* Add to path variable list */ 510 error = bhnd_nvram_plist_append_val(merged, name, val); 511 bhnd_nvram_val_release(val); 512 if (error) 513 return (error); 514 } 515 516 return (0); 517 } 518 519 /** 520 * Find a free alias value for @p path, and append the devpathXX alias 521 * declaration to @p plist. 522 * 523 * @param sc The NVRAM store instance. 524 * @param path The NVRAM path for which a devpath alias 525 * variable should be produced. 526 * @param devpath The devpathXX path value for @p path. 527 * @param plist The property list to which @p path's devpath 528 * variable will be appended. 529 * @param[out] alias_val On success, will be set to the alias value 530 * allocated for @p path. 531 * 532 * @retval 0 success 533 * @retval ENOMEM If allocation fails. 534 * @retval non-zero If merging the variables defined in @p path otherwise 535 * fails, a regular unix error code will be returned. 536 */ 537 static int 538 bhnd_nvstore_export_devpath_alias(struct bhnd_nvram_store *sc, 539 bhnd_nvstore_path *path, const char *devpath, bhnd_nvram_plist *plist, 540 u_long *alias_val) 541 { 542 bhnd_nvstore_alias *alias; 543 char *pathvar; 544 int error; 545 546 *alias_val = 0; 547 548 /* Prefer alias value already reserved for this path. */ 549 alias = bhnd_nvstore_find_alias(sc, path->path_str); 550 if (alias != NULL) { 551 *alias_val = alias->alias; 552 553 /* Allocate devpathXX variable name */ 554 bhnd_nv_asprintf(&pathvar, "devpath%lu", *alias_val); 555 if (pathvar == NULL) 556 return (ENOMEM); 557 558 /* Append alias variable to property list */ 559 error = bhnd_nvram_plist_append_string(plist, pathvar, devpath); 560 561 BHND_NV_ASSERT(error != EEXIST, ("reserved alias %lu:%s in use", 562 * alias_val, path->path_str)); 563 564 bhnd_nv_free(pathvar); 565 return (error); 566 } 567 568 /* Find the next free devpathXX alias entry */ 569 while (1) { 570 /* Skip existing reserved alias values */ 571 while (bhnd_nvstore_get_alias(sc, *alias_val) != NULL) { 572 if (*alias_val == ULONG_MAX) 573 return (ENOMEM); 574 575 (*alias_val)++; 576 } 577 578 /* Allocate devpathXX variable name */ 579 bhnd_nv_asprintf(&pathvar, "devpath%lu", *alias_val); 580 if (pathvar == NULL) 581 return (ENOMEM); 582 583 /* If not in-use, we can terminate the search */ 584 if (!bhnd_nvram_plist_contains(plist, pathvar)) 585 break; 586 587 /* Keep searching */ 588 bhnd_nv_free(pathvar); 589 590 if (*alias_val == ULONG_MAX) 591 return (ENOMEM); 592 593 (*alias_val)++; 594 } 595 596 /* Append alias variable to property list */ 597 error = bhnd_nvram_plist_append_string(plist, pathvar, devpath); 598 599 bhnd_nv_free(pathvar); 600 return (error); 601 } 602 603 /** 604 * Export a single @p child path's properties, appending the result to @p plist. 605 * 606 * @param sc The NVRAM store instance. 607 * @param top The root NVRAM path being exported. 608 * @param child The NVRAM path to be exported. 609 * @param plist The property list to which @p child's exported 610 * properties should be appended. 611 * @param flags Export flags. See BHND_NVSTORE_EXPORT_*. 612 * 613 * @retval 0 success 614 * @retval ENOMEM If allocation fails. 615 * @retval non-zero If merging the variables defined in @p path otherwise 616 * fails, a regular unix error code will be returned. 617 */ 618 static int 619 bhnd_nvram_store_export_child(struct bhnd_nvram_store *sc, 620 bhnd_nvstore_path *top, bhnd_nvstore_path *child, bhnd_nvram_plist *plist, 621 uint32_t flags) 622 { 623 bhnd_nvram_plist *path_vars; 624 bhnd_nvram_prop *prop; 625 const char *relpath; 626 char *prefix, *namebuf; 627 size_t prefix_len, relpath_len; 628 size_t namebuf_size; 629 bool emit_compact_devpath; 630 int error; 631 632 BHND_NVSTORE_LOCK_ASSERT(sc, MA_OWNED); 633 634 prefix = NULL; 635 path_vars = NULL; 636 namebuf = NULL; 637 638 /* Determine the path relative to the top-level path */ 639 relpath = bhnd_nvstore_parse_relpath(top->path_str, child->path_str); 640 if (relpath == NULL) { 641 /* Skip -- not a child of the root path */ 642 return (0); 643 } 644 relpath_len = strlen(relpath); 645 646 /* Skip sub-path if export of children was not requested, */ 647 if (!BHND_NVSTORE_GET_FLAG(flags, EXPORT_CHILDREN) && relpath_len > 0) 648 return (0); 649 650 /* Collect all variables to be included in the export */ 651 if ((path_vars = bhnd_nvram_plist_new()) == NULL) 652 return (ENOMEM); 653 654 if ((error = bhnd_nvstore_export_merge(sc, child, path_vars, flags))) { 655 bhnd_nvram_plist_release(path_vars); 656 return (error); 657 } 658 659 /* Skip if no children are to be exported */ 660 if (bhnd_nvram_plist_count(path_vars) == 0) { 661 bhnd_nvram_plist_release(path_vars); 662 return (0); 663 } 664 665 /* Determine appropriate device path encoding */ 666 emit_compact_devpath = false; 667 if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_COMPACT_DEVPATHS)) { 668 /* Re-encode as compact (if non-empty path) */ 669 if (relpath_len > 0) 670 emit_compact_devpath = true; 671 } else if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_EXPAND_DEVPATHS)) { 672 /* Re-encode with fully expanded device path */ 673 emit_compact_devpath = false; 674 } else if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_PRESERVE_DEVPATHS)) { 675 /* Preserve existing encoding of this path */ 676 if (bhnd_nvstore_find_alias(sc, child->path_str) != NULL) 677 emit_compact_devpath = true; 678 } else { 679 BHND_NV_LOG("invalid device path flag: %#" PRIx32, flags); 680 error = EINVAL; 681 goto finished; 682 } 683 684 /* Allocate variable device path prefix to use for all property names, 685 * and if using compact encoding, emit the devpathXX= variable */ 686 prefix = NULL; 687 prefix_len = 0; 688 if (emit_compact_devpath) { 689 u_long alias_val; 690 int len; 691 692 /* Reserve an alias value and append the devpathXX= variable to 693 * the property list */ 694 error = bhnd_nvstore_export_devpath_alias(sc, child, relpath, 695 plist, &alias_val); 696 if (error) 697 goto finished; 698 699 /* Allocate variable name prefix */ 700 len = bhnd_nv_asprintf(&prefix, "%lu:", alias_val); 701 if (prefix == NULL) { 702 error = ENOMEM; 703 goto finished; 704 } 705 706 prefix_len = len; 707 } else if (relpath_len > 0) { 708 int len; 709 710 /* Allocate the variable name prefix, appending '/' to the 711 * relative path */ 712 len = bhnd_nv_asprintf(&prefix, "%s/", relpath); 713 if (prefix == NULL) { 714 error = ENOMEM; 715 goto finished; 716 } 717 718 prefix_len = len; 719 } 720 721 /* If prefixing of variable names is required, allocate a name 722 * formatting buffer */ 723 namebuf_size = 0; 724 if (prefix != NULL) { 725 size_t maxlen; 726 727 /* Find the maximum name length */ 728 maxlen = 0; 729 prop = NULL; 730 while ((prop = bhnd_nvram_plist_next(path_vars, prop))) { 731 const char *name; 732 733 name = bhnd_nvram_prop_name(prop); 734 maxlen = bhnd_nv_ummax(strlen(name), maxlen); 735 } 736 737 /* Allocate name buffer (path-prefix + name + '\0') */ 738 namebuf_size = prefix_len + maxlen + 1; 739 namebuf = bhnd_nv_malloc(namebuf_size); 740 if (namebuf == NULL) { 741 error = ENOMEM; 742 goto finished; 743 } 744 } 745 746 /* Append all path variables to the export plist, prepending the 747 * device-path prefix to the variable names, if required */ 748 prop = NULL; 749 while ((prop = bhnd_nvram_plist_next(path_vars, prop)) != NULL) { 750 const char *name; 751 752 /* Prepend device prefix to the variable name */ 753 name = bhnd_nvram_prop_name(prop); 754 if (prefix != NULL) { 755 int len; 756 757 /* 758 * Write prefixed variable name to our name buffer. 759 * 760 * We precalcuate the size when scanning all names 761 * above, so this should always succeed. 762 */ 763 len = snprintf(namebuf, namebuf_size, "%s%s", prefix, 764 name); 765 if (len < 0 || (size_t)len >= namebuf_size) 766 BHND_NV_PANIC("invalid max_name_len"); 767 768 name = namebuf; 769 } 770 771 /* Add property to export plist */ 772 error = bhnd_nvram_plist_append_val(plist, name, 773 bhnd_nvram_prop_val(prop)); 774 if (error) 775 goto finished; 776 } 777 778 /* Success */ 779 error = 0; 780 781 finished: 782 if (prefix != NULL) 783 bhnd_nv_free(prefix); 784 785 if (namebuf != NULL) 786 bhnd_nv_free(namebuf); 787 788 if (path_vars != NULL) 789 bhnd_nvram_plist_release(path_vars); 790 791 return (error); 792 } 793 794 /** 795 * Export a flat, ordered NVRAM property list representation of all NVRAM 796 * properties at @p path. 797 * 798 * @param sc The NVRAM store instance. 799 * @param path The NVRAM path to export, or NULL to select the root 800 * path. 801 * @param[out] cls On success, will be set to the backing data class 802 * of @p sc. If the data class is are not desired, 803 * a NULL pointer may be provided. 804 * @param[out] props On success, will be set to a caller-owned property 805 * list containing the exported properties. The caller is 806 * responsible for releasing this value via 807 * bhnd_nvram_plist_release(). 808 * @param[out] options On success, will be set to a caller-owned property 809 * list containing the current NVRAM serialization options 810 * for @p sc. The caller is responsible for releasing this 811 * value via bhnd_nvram_plist_release(). 812 * @param flags Export flags. See BHND_NVSTORE_EXPORT_*. 813 * 814 * @retval 0 success 815 * @retval EINVAL If @p flags is invalid. 816 * @retval ENOENT The requested path was not found. 817 * @retval ENOMEM If allocation fails. 818 * @retval non-zero If export of @p path otherwise fails, a regular unix 819 * error code will be returned. 820 */ 821 int 822 bhnd_nvram_store_export(struct bhnd_nvram_store *sc, const char *path, 823 bhnd_nvram_data_class **cls, bhnd_nvram_plist **props, 824 bhnd_nvram_plist **options, uint32_t flags) 825 { 826 bhnd_nvram_plist *unordered; 827 bhnd_nvstore_path *top; 828 bhnd_nvram_prop *prop; 829 const char *name; 830 void *cookiep; 831 size_t num_dpath_flags; 832 int error; 833 834 *props = NULL; 835 unordered = NULL; 836 num_dpath_flags = 0; 837 if (options != NULL) 838 *options = NULL; 839 840 /* Default to exporting root path */ 841 if (path == NULL) 842 path = BHND_NVSTORE_ROOT_PATH; 843 844 /* Default to exporting all properties */ 845 if (!BHND_NVSTORE_GET_FLAG(flags, EXPORT_COMMITTED) && 846 !BHND_NVSTORE_GET_FLAG(flags, EXPORT_UNCOMMITTED)) 847 { 848 flags |= BHND_NVSTORE_EXPORT_ALL_VARS; 849 } 850 851 /* Default to preserving the current device path encoding */ 852 if (!BHND_NVSTORE_GET_FLAG(flags, EXPORT_COMPACT_DEVPATHS) && 853 !BHND_NVSTORE_GET_FLAG(flags, EXPORT_EXPAND_DEVPATHS)) 854 { 855 flags |= BHND_NVSTORE_EXPORT_PRESERVE_DEVPATHS; 856 } 857 858 /* Exactly one device path encoding flag must be set */ 859 if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_COMPACT_DEVPATHS)) 860 num_dpath_flags++; 861 862 if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_EXPAND_DEVPATHS)) 863 num_dpath_flags++; 864 865 if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_PRESERVE_DEVPATHS)) 866 num_dpath_flags++; 867 868 if (num_dpath_flags != 1) 869 return (EINVAL); 870 871 /* If EXPORT_DELETED is set, EXPORT_UNCOMMITTED must be set too */ 872 if (BHND_NVSTORE_GET_FLAG(flags, EXPORT_DELETED) && 873 !BHND_NVSTORE_GET_FLAG(flags, EXPORT_DELETED)) 874 { 875 return (EINVAL); 876 } 877 878 /* Lock internal state before querying paths/properties */ 879 BHND_NVSTORE_LOCK(sc); 880 881 /* Fetch referenced path */ 882 top = bhnd_nvstore_get_path(sc, path, strlen(path)); 883 if (top == NULL) { 884 error = ENOENT; 885 goto failed; 886 } 887 888 /* Allocate new, empty property list */ 889 if ((unordered = bhnd_nvram_plist_new()) == NULL) { 890 error = ENOMEM; 891 goto failed; 892 } 893 894 /* Export the top-level path first */ 895 error = bhnd_nvram_store_export_child(sc, top, top, unordered, flags); 896 if (error) 897 goto failed; 898 899 /* Attempt to export any children of the root path */ 900 for (size_t i = 0; i < nitems(sc->paths); i++) { 901 bhnd_nvstore_path *child; 902 903 LIST_FOREACH(child, &sc->paths[i], np_link) { 904 /* Top-level path was already exported */ 905 if (child == top) 906 continue; 907 908 error = bhnd_nvram_store_export_child(sc, top, 909 child, unordered, flags); 910 if (error) 911 goto failed; 912 } 913 } 914 915 /* If requested, provide the current class and serialization options */ 916 if (cls != NULL) 917 *cls = bhnd_nvram_data_get_class(sc->data); 918 919 if (options != NULL) 920 *options = bhnd_nvram_plist_retain(sc->data_opts); 921 922 /* 923 * If we're re-encoding device paths, don't bother preserving the 924 * existing NVRAM variable order; our variable names will not match 925 * the existing backing NVRAM data. 926 */ 927 if (!BHND_NVSTORE_GET_FLAG(flags, EXPORT_PRESERVE_DEVPATHS)) { 928 *props = unordered; 929 unordered = NULL; 930 931 goto finished; 932 } 933 934 /* 935 * Re-order the flattened output to match the existing NVRAM variable 936 * ordering. 937 * 938 * We append all new variables at the end of the input; this should 939 * reduce the delta that needs to be written (e.g. to flash) when 940 * committing NVRAM updates, and should result in a serialization 941 * identical to the input serialization if uncommitted updates are 942 * excluded from the export. 943 */ 944 if ((*props = bhnd_nvram_plist_new()) == NULL) { 945 error = ENOMEM; 946 goto failed; 947 } 948 949 /* Using the backing NVRAM data ordering to order all variables 950 * currently defined in the backing store */ 951 cookiep = NULL; 952 while ((name = bhnd_nvram_data_next(sc->data, &cookiep))) { 953 prop = bhnd_nvram_plist_get_prop(unordered, name); 954 if (prop == NULL) 955 continue; 956 957 /* Append to ordered result */ 958 if ((error = bhnd_nvram_plist_append(*props, prop))) 959 goto failed; 960 961 /* Remove from unordered list */ 962 bhnd_nvram_plist_remove(unordered, name); 963 } 964 965 /* Any remaining variables are new, and should be appended to the 966 * end of the export list */ 967 prop = NULL; 968 while ((prop = bhnd_nvram_plist_next(unordered, prop)) != NULL) { 969 if ((error = bhnd_nvram_plist_append(*props, prop))) 970 goto failed; 971 } 972 973 /* Export complete */ 974 finished: 975 BHND_NVSTORE_UNLOCK(sc); 976 977 if (unordered != NULL) 978 bhnd_nvram_plist_release(unordered); 979 980 return (0); 981 982 failed: 983 BHND_NVSTORE_UNLOCK(sc); 984 985 if (unordered != NULL) 986 bhnd_nvram_plist_release(unordered); 987 988 if (options != NULL && *options != NULL) 989 bhnd_nvram_plist_release(*options); 990 991 if (*props != NULL) 992 bhnd_nvram_plist_release(*props); 993 994 return (error); 995 } 996 997 /** 998 * Encode all NVRAM properties at @p path, using the @p store's current NVRAM 999 * data format. 1000 * 1001 * @param sc The NVRAM store instance. 1002 * @param path The NVRAM path to export, or NULL to select the root 1003 * path. 1004 * @param[out] data On success, will be set to the newly serialized value. 1005 * The caller is responsible for freeing this value 1006 * via bhnd_nvram_io_free(). 1007 * @param flags Export flags. See BHND_NVSTORE_EXPORT_*. 1008 * 1009 * @retval 0 success 1010 * @retval EINVAL If @p flags is invalid. 1011 * @retval ENOENT The requested path was not found. 1012 * @retval ENOMEM If allocation fails. 1013 * @retval non-zero If serialization of @p path otherwise fails, a regular 1014 * unix error code will be returned. 1015 */ 1016 int 1017 bhnd_nvram_store_serialize(struct bhnd_nvram_store *sc, const char *path, 1018 struct bhnd_nvram_io **data, uint32_t flags) 1019 { 1020 bhnd_nvram_plist *props; 1021 bhnd_nvram_plist *options; 1022 bhnd_nvram_data_class *cls; 1023 struct bhnd_nvram_io *io; 1024 void *outp; 1025 size_t olen; 1026 int error; 1027 1028 props = NULL; 1029 options = NULL; 1030 io = NULL; 1031 1032 /* Perform requested export */ 1033 error = bhnd_nvram_store_export(sc, path, &cls, &props, &options, 1034 flags); 1035 if (error) 1036 return (error); 1037 1038 /* Determine serialized size */ 1039 error = bhnd_nvram_data_serialize(cls, props, options, NULL, &olen); 1040 if (error) 1041 goto failed; 1042 1043 /* Allocate output buffer */ 1044 if ((io = bhnd_nvram_iobuf_empty(olen, olen)) == NULL) { 1045 error = ENOMEM; 1046 goto failed; 1047 } 1048 1049 /* Fetch write pointer */ 1050 if ((error = bhnd_nvram_io_write_ptr(io, 0, &outp, olen, NULL))) 1051 goto failed; 1052 1053 /* Perform serialization */ 1054 error = bhnd_nvram_data_serialize(cls, props, options, outp, &olen); 1055 if (error) 1056 goto failed; 1057 1058 if ((error = bhnd_nvram_io_setsize(io, olen))) 1059 goto failed; 1060 1061 /* Success */ 1062 bhnd_nvram_plist_release(props); 1063 bhnd_nvram_plist_release(options); 1064 1065 *data = io; 1066 return (0); 1067 1068 failed: 1069 if (props != NULL) 1070 bhnd_nvram_plist_release(props); 1071 1072 if (options != NULL) 1073 bhnd_nvram_plist_release(options); 1074 1075 if (io != NULL) 1076 bhnd_nvram_io_free(io); 1077 1078 return (error); 1079 } 1080 1081 /** 1082 * Read an NVRAM variable. 1083 * 1084 * @param sc The NVRAM parser state. 1085 * @param name The NVRAM variable name. 1086 * @param[out] outp On success, the requested value will be written 1087 * to this buffer. This argment may be NULL if 1088 * the value is not desired. 1089 * @param[in,out] olen The capacity of @p outp. On success, will be set 1090 * to the actual size of the requested value. 1091 * @param otype The requested data type to be written to 1092 * @p outp. 1093 * 1094 * @retval 0 success 1095 * @retval ENOENT The requested variable was not found. 1096 * @retval ENOMEM If @p outp is non-NULL and a buffer of @p olen is too 1097 * small to hold the requested value. 1098 * @retval non-zero If reading @p name otherwise fails, a regular unix 1099 * error code will be returned. 1100 */ 1101 int 1102 bhnd_nvram_store_getvar(struct bhnd_nvram_store *sc, const char *name, 1103 void *outp, size_t *olen, bhnd_nvram_type otype) 1104 { 1105 bhnd_nvstore_name_info info; 1106 bhnd_nvstore_path *path; 1107 bhnd_nvram_prop *prop; 1108 void *cookiep; 1109 int error; 1110 1111 BHND_NVSTORE_LOCK(sc); 1112 1113 /* Parse the variable name */ 1114 error = bhnd_nvstore_parse_name_info(name, BHND_NVSTORE_NAME_EXTERNAL, 1115 sc->data_caps, &info); 1116 if (error) 1117 goto finished; 1118 1119 /* Fetch the variable's enclosing path entry */ 1120 if ((path = bhnd_nvstore_var_get_path(sc, &info)) == NULL) { 1121 error = ENOENT; 1122 goto finished; 1123 } 1124 1125 /* Search uncommitted updates first */ 1126 prop = bhnd_nvstore_path_get_update(sc, path, info.name); 1127 if (prop != NULL) { 1128 if (bhnd_nvram_prop_is_null(prop)) { 1129 /* NULL denotes a pending deletion */ 1130 error = ENOENT; 1131 } else { 1132 error = bhnd_nvram_prop_encode(prop, outp, olen, otype); 1133 } 1134 goto finished; 1135 } 1136 1137 /* Search the backing NVRAM data */ 1138 cookiep = bhnd_nvstore_path_data_lookup(sc, path, info.name); 1139 if (cookiep != NULL) { 1140 /* Found in backing store */ 1141 error = bhnd_nvram_data_getvar(sc->data, cookiep, outp, olen, 1142 otype); 1143 goto finished; 1144 } 1145 1146 /* Not found */ 1147 error = ENOENT; 1148 1149 finished: 1150 BHND_NVSTORE_UNLOCK(sc); 1151 return (error); 1152 } 1153 1154 /** 1155 * Common bhnd_nvram_store_set*() and bhnd_nvram_store_unsetvar() 1156 * implementation. 1157 * 1158 * If @p value is NULL, the variable will be marked for deletion. 1159 */ 1160 static int 1161 bhnd_nvram_store_setval_common(struct bhnd_nvram_store *sc, const char *name, 1162 bhnd_nvram_val *value) 1163 { 1164 bhnd_nvstore_path *path; 1165 bhnd_nvstore_name_info info; 1166 int error; 1167 1168 BHND_NVSTORE_LOCK_ASSERT(sc, MA_OWNED); 1169 1170 /* Parse the variable name */ 1171 error = bhnd_nvstore_parse_name_info(name, BHND_NVSTORE_NAME_EXTERNAL, 1172 sc->data_caps, &info); 1173 if (error) 1174 return (error); 1175 1176 /* Fetch the variable's enclosing path entry */ 1177 if ((path = bhnd_nvstore_var_get_path(sc, &info)) == NULL) 1178 return (error); 1179 1180 /* Register the update entry */ 1181 return (bhnd_nvstore_path_register_update(sc, path, info.name, value)); 1182 } 1183 1184 /** 1185 * Set an NVRAM variable. 1186 * 1187 * @param sc The NVRAM parser state. 1188 * @param name The NVRAM variable name. 1189 * @param value The new value. 1190 * 1191 * @retval 0 success 1192 * @retval ENOENT The requested variable @p name was not found. 1193 * @retval EINVAL If @p value is invalid. 1194 */ 1195 int 1196 bhnd_nvram_store_setval(struct bhnd_nvram_store *sc, const char *name, 1197 bhnd_nvram_val *value) 1198 { 1199 int error; 1200 1201 BHND_NVSTORE_LOCK(sc); 1202 error = bhnd_nvram_store_setval_common(sc, name, value); 1203 BHND_NVSTORE_UNLOCK(sc); 1204 1205 return (error); 1206 } 1207 1208 /** 1209 * Set an NVRAM variable. 1210 * 1211 * @param sc The NVRAM parser state. 1212 * @param name The NVRAM variable name. 1213 * @param[out] inp The new value. 1214 * @param[in,out] ilen The size of @p inp. 1215 * @param itype The data type of @p inp. 1216 * 1217 * @retval 0 success 1218 * @retval ENOENT The requested variable @p name was not found. 1219 * @retval EINVAL If the new value is invalid. 1220 * @retval EINVAL If @p name is read-only. 1221 */ 1222 int 1223 bhnd_nvram_store_setvar(struct bhnd_nvram_store *sc, const char *name, 1224 const void *inp, size_t ilen, bhnd_nvram_type itype) 1225 { 1226 bhnd_nvram_val val; 1227 int error; 1228 1229 error = bhnd_nvram_val_init(&val, NULL, inp, ilen, itype, 1230 BHND_NVRAM_VAL_FIXED|BHND_NVRAM_VAL_BORROW_DATA); 1231 if (error) { 1232 BHND_NV_LOG("error initializing value: %d\n", error); 1233 return (EINVAL); 1234 } 1235 1236 BHND_NVSTORE_LOCK(sc); 1237 error = bhnd_nvram_store_setval_common(sc, name, &val); 1238 BHND_NVSTORE_UNLOCK(sc); 1239 1240 bhnd_nvram_val_release(&val); 1241 1242 return (error); 1243 } 1244 1245 /** 1246 * Unset an NVRAM variable. 1247 * 1248 * @param sc The NVRAM parser state. 1249 * @param name The NVRAM variable name. 1250 * 1251 * @retval 0 success 1252 * @retval ENOENT The requested variable @p name was not found. 1253 * @retval EINVAL If @p name is read-only. 1254 */ 1255 int 1256 bhnd_nvram_store_unsetvar(struct bhnd_nvram_store *sc, const char *name) 1257 { 1258 int error; 1259 1260 BHND_NVSTORE_LOCK(sc); 1261 error = bhnd_nvram_store_setval_common(sc, name, BHND_NVRAM_VAL_NULL); 1262 BHND_NVSTORE_UNLOCK(sc); 1263 1264 return (error); 1265 }
Cache object: 7a546221aac801dc220950a65b031e68
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