disk/part.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #include <common.h>
   8 #include <blk.h>
   9 #include <command.h>
  10 #include <env.h>
  11 #include <errno.h>
  12 #include <ide.h>
  13 #include <log.h>
  14 #include <malloc.h>
  15 #include <part.h>
  16 #include <ubifs_uboot.h>
  17
  18 #undef  PART_DEBUG
  19
  20 #ifdef  PART_DEBUG
  21 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  22 #else
  23 #define PRINTF(fmt,args...)
  24 #endif
  25
  26 /* Check all partition types */
  27 #define PART_TYPE_ALL           -1
  28
  29 /**
  30  * part_driver_get_type() - Get a driver given its type
  31  *
  32  * @part_type: Partition type to find the driver for
  33  * Return: Driver for that type, or NULL if none
  34  */
  35 static struct part_driver *part_driver_get_type(int part_type)
  36 {
  37         struct part_driver *drv =
  38                 ll_entry_start(struct part_driver, part_driver);
  39         const int n_ents = ll_entry_count(struct part_driver, part_driver);
  40         struct part_driver *entry;
  41
  42         for (entry = drv; entry != drv + n_ents; entry++) {
  43                 if (part_type == entry->part_type)
  44                         return entry;
  45         }
  46
  47         /* Not found */
  48         return NULL;
  49 }
  50
  51 /**
  52  * part_driver_lookup_type() - Look up the partition driver for a blk device
  53  *
  54  * If @desc->part_type is PART_TYPE_UNKNOWN, this checks each parition driver
  55  * against the blk device to see if there is a valid partition table acceptable
  56  * to that driver.
  57  *
  58  * If @desc->part_type is already set, it just returns the driver for that
  59  * type, without testing if the driver can find a valid partition on the
  60  * descriptor.
  61  *
  62  * On success it updates @desc->part_type if set to PART_TYPE_UNKNOWN on entry
  63  *
  64  * @dev_desc: Device descriptor
  65  * Return: Driver found, or NULL if none
  66  */
  67 static struct part_driver *part_driver_lookup_type(struct blk_desc *desc)
  68 {
  69         struct part_driver *drv =
  70                 ll_entry_start(struct part_driver, part_driver);
  71         const int n_ents = ll_entry_count(struct part_driver, part_driver);
  72         struct part_driver *entry;
  73
  74         if (desc->part_type == PART_TYPE_UNKNOWN) {
  75                 for (entry = drv; entry != drv + n_ents; entry++) {
  76                         int ret;
  77
  78                         ret = entry->test(desc);
  79                         if (!ret) {
  80                                 desc->part_type = entry->part_type;
  81                                 return entry;
  82                         }
  83                 }
  84         } else {
  85                 return part_driver_get_type(desc->part_type);
  86         }
  87
  88         /* Not found */
  89         return NULL;
  90 }
  91
  92 int part_get_type_by_name(const char *name)
  93 {
  94         struct part_driver *drv =
  95                 ll_entry_start(struct part_driver, part_driver);
  96         const int n_ents = ll_entry_count(struct part_driver, part_driver);
  97         struct part_driver *entry;
  98
  99         for (entry = drv; entry != drv + n_ents; entry++) {
 100                 if (!strcasecmp(name, entry->name))
 101                         return entry->part_type;
 102         }
 103
 104         /* Not found */
 105         return PART_TYPE_UNKNOWN;
 106 }
 107
 108 /**
 109  * get_dev_hwpart() - Get the descriptor for a device with hardware partitions
 110  *
 111  * @ifname:     Interface name (e.g. "ide", "scsi")
 112  * @dev:        Device number (0 for first device on that interface, 1 for
 113  *              second, etc.
 114  * @hwpart: Hardware partition, or 0 if none (used for MMC)
 115  * Return: pointer to the block device, or NULL if not available, or an
 116  *         error occurred.
 117  */
 118 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
 119 {
 120         struct blk_desc *desc;
 121         int ret;
 122
 123         if (!blk_enabled())
 124                 return NULL;
 125         desc = blk_get_devnum_by_uclass_idname(ifname, dev);
 126         if (!desc) {
 127                 debug("%s: No device for iface '%s', dev %d\n", __func__,
 128                       ifname, dev);
 129                 return NULL;
 130         }
 131         ret = blk_dselect_hwpart(desc, hwpart);
 132         if (ret) {
 133                 debug("%s: Failed to select h/w partition: err-%d\n", __func__,
 134                       ret);
 135                 return NULL;
 136         }
 137
 138         return desc;
 139 }
 140
 141 struct blk_desc *blk_get_dev(const char *ifname, int dev)
 142 {
 143         if (!blk_enabled())
 144                 return NULL;
 145
 146         return get_dev_hwpart(ifname, dev, 0);
 147 }
 148
 149 /* ------------------------------------------------------------------------- */
 150 /*
 151  * reports device info to the user
 152  */
 153
 154 #ifdef CONFIG_LBA48
 155 typedef uint64_t lba512_t;
 156 #else
 157 typedef lbaint_t lba512_t;
 158 #endif
 159
 160 /*
 161  * Overflowless variant of (block_count * mul_by / 2**right_shift)
 162  * when 2**right_shift > mul_by
 163  */
 164 static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by,
 165                               int right_shift)
 166 {
 167         lba512_t bc_quot, bc_rem;
 168
 169         /* x * m / d == x / d * m + (x % d) * m / d */
 170         bc_quot = block_count >> right_shift;
 171         bc_rem  = block_count - (bc_quot << right_shift);
 172         return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift);
 173 }
 174
 175 void dev_print(struct blk_desc *desc)
 176 {
 177         lba512_t lba512; /* number of blocks if 512bytes block size */
 178
 179         if (desc->type == DEV_TYPE_UNKNOWN) {
 180                 puts ("not available\n");
 181                 return;
 182         }
 183
 184         switch (desc->uclass_id) {
 185         case UCLASS_SCSI:
 186                 printf("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n", desc->target,
 187                        desc->lun, desc->vendor, desc->product, desc->revision);
 188                 break;
 189         case UCLASS_IDE:
 190         case UCLASS_AHCI:
 191                 printf("Model: %s Firm: %s Ser#: %s\n", desc->vendor,
 192                        desc->revision, desc->product);
 193                 break;
 194         case UCLASS_MMC:
 195         case UCLASS_USB:
 196         case UCLASS_NVME:
 197         case UCLASS_PVBLOCK:
 198         case UCLASS_HOST:
 199         case UCLASS_BLKMAP:
 200         case UCLASS_RKMTD:
 201                 printf ("Vendor: %s Rev: %s Prod: %s\n",
 202                         desc->vendor,
 203                         desc->revision,
 204                         desc->product);
 205                 break;
 206         case UCLASS_VIRTIO:
 207                 printf("%s VirtIO Block Device\n", desc->vendor);
 208                 break;
 209         case UCLASS_EFI_MEDIA:
 210                 printf("EFI media Block Device %d\n", desc->devnum);
 211                 break;
 212         case UCLASS_INVALID:
 213                 puts("device type unknown\n");
 214                 return;
 215         default:
 216                 printf("Unhandled device type: %i\n", desc->uclass_id);
 217                 return;
 218         }
 219         puts ("            Type: ");
 220         if (desc->removable)
 221                 puts ("Removable ");
 222         switch (desc->type & 0x1F) {
 223         case DEV_TYPE_HARDDISK:
 224                 puts ("Hard Disk");
 225                 break;
 226         case DEV_TYPE_CDROM:
 227                 puts ("CD ROM");
 228                 break;
 229         case DEV_TYPE_OPDISK:
 230                 puts ("Optical Device");
 231                 break;
 232         case DEV_TYPE_TAPE:
 233                 puts ("Tape");
 234                 break;
 235         default:
 236                 printf("# %02X #", desc->type & 0x1F);
 237                 break;
 238         }
 239         puts ("\n");
 240         if (desc->lba > 0L && desc->blksz > 0L) {
 241                 ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
 242                 lbaint_t lba;
 243
 244                 lba = desc->lba;
 245
 246                 lba512 = lba * (desc->blksz / 512);
 247                 /* round to 1 digit */
 248                 /* 2048 = (1024 * 1024) / 512 MB */
 249                 mb = lba512_muldiv(lba512, 10, 11);
 250
 251                 mb_quot = mb / 10;
 252                 mb_rem  = mb - (10 * mb_quot);
 253
 254                 gb = mb / 1024;
 255                 gb_quot = gb / 10;
 256                 gb_rem  = gb - (10 * gb_quot);
 257 #ifdef CONFIG_LBA48
 258                 if (desc->lba48)
 259                         printf ("            Supports 48-bit addressing\n");
 260 #endif
 261 #if defined(CONFIG_SYS_64BIT_LBA)
 262                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
 263                         mb_quot, mb_rem,
 264                         gb_quot, gb_rem,
 265                         lba,
 266                         desc->blksz);
 267 #else
 268                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
 269                         mb_quot, mb_rem,
 270                         gb_quot, gb_rem,
 271                         (ulong)lba,
 272                         desc->blksz);
 273 #endif
 274         } else {
 275                 puts ("            Capacity: not available\n");
 276         }
 277 }
 278
 279 void part_init(struct blk_desc *desc)
 280 {
 281         struct part_driver *drv =
 282                 ll_entry_start(struct part_driver, part_driver);
 283         const int n_ents = ll_entry_count(struct part_driver, part_driver);
 284         struct part_driver *entry;
 285
 286         blkcache_invalidate(desc->uclass_id, desc->devnum);
 287
 288         desc->part_type = PART_TYPE_UNKNOWN;
 289         for (entry = drv; entry != drv + n_ents; entry++) {
 290                 int ret;
 291
 292                 ret = entry->test(desc);
 293                 debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
 294                 if (!ret) {
 295                         desc->part_type = entry->part_type;
 296                         break;
 297                 }
 298         }
 299 }
 300
 301 static void print_part_header(const char *type, struct blk_desc *desc)
 302 {
 303 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
 304         CONFIG_IS_ENABLED(DOS_PARTITION) || \
 305         CONFIG_IS_ENABLED(ISO_PARTITION) || \
 306         CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
 307         CONFIG_IS_ENABLED(EFI_PARTITION)
 308         puts ("\nPartition Map for ");
 309         switch (desc->uclass_id) {
 310         case UCLASS_IDE:
 311                 puts ("IDE");
 312                 break;
 313         case UCLASS_AHCI:
 314                 puts ("SATA");
 315                 break;
 316         case UCLASS_SCSI:
 317                 puts ("SCSI");
 318                 break;
 319         case UCLASS_USB:
 320                 puts ("USB");
 321                 break;
 322         case UCLASS_MMC:
 323                 puts ("MMC");
 324                 break;
 325         case UCLASS_HOST:
 326                 puts ("HOST");
 327                 break;
 328         case UCLASS_NVME:
 329                 puts ("NVMe");
 330                 break;
 331         case UCLASS_PVBLOCK:
 332                 puts("PV BLOCK");
 333                 break;
 334         case UCLASS_RKMTD:
 335                 puts("RKMTD");
 336                 break;
 337         case UCLASS_VIRTIO:
 338                 puts("VirtIO");
 339                 break;
 340         case UCLASS_EFI_MEDIA:
 341                 puts("EFI");
 342                 break;
 343         case UCLASS_BLKMAP:
 344                 puts("BLKMAP");
 345                 break;
 346         default:
 347                 printf("UNKNOWN(%d)", desc->uclass_id);
 348                 break;
 349         }
 350         printf (" device %d  --   Partition Type: %s\n\n",
 351                         desc->devnum, type);
 352 #endif /* any CONFIG_..._PARTITION */
 353 }
 354
 355 void part_print(struct blk_desc *desc)
 356 {
 357         struct part_driver *drv;
 358
 359         drv = part_driver_lookup_type(desc);
 360         if (!drv) {
 361                 printf("## Unknown partition table type %x\n",
 362                        desc->part_type);
 363                 return;
 364         }
 365
 366         PRINTF("## Testing for valid %s partition ##\n", drv->name);
 367         print_part_header(drv->name, desc);
 368         if (drv->print)
 369                 drv->print(desc);
 370 }
 371
 372 int part_get_info_by_type(struct blk_desc *desc, int part, int part_type,
 373                           struct disk_partition *info)
 374 {
 375         struct part_driver *drv;
 376
 377         if (blk_enabled()) {
 378                 /* The common case is no UUID support */
 379                 disk_partition_clr_uuid(info);
 380                 disk_partition_clr_type_guid(info);
 381
 382                 if (part_type == PART_TYPE_UNKNOWN) {
 383                         drv = part_driver_lookup_type(desc);
 384                 } else {
 385                         drv = part_driver_get_type(part_type);
 386                 }
 387
 388                 if (!drv) {
 389                         debug("## Unknown partition table type %x\n",
 390                               desc->part_type);
 391                         return -EPROTONOSUPPORT;
 392                 }
 393                 if (!drv->get_info) {
 394                         PRINTF("## Driver %s does not have the get_info() method\n",
 395                                drv->name);
 396                         return -ENOSYS;
 397                 }
 398                 if (drv->get_info(desc, part, info) == 0) {
 399                         PRINTF("## Valid %s partition found ##\n", drv->name);
 400                         return 0;
 401                 }
 402         }
 403
 404         return -ENOENT;
 405 }
 406
 407 int part_get_info(struct blk_desc *desc, int part,
 408                   struct disk_partition *info)
 409 {
 410         return part_get_info_by_type(desc, part, PART_TYPE_UNKNOWN, info);
 411 }
 412
 413 int part_get_info_whole_disk(struct blk_desc *desc,
 414                              struct disk_partition *info)
 415 {
 416         info->start = 0;
 417         info->size = desc->lba;
 418         info->blksz = desc->blksz;
 419         info->bootable = 0;
 420         strcpy((char *)info->type, BOOT_PART_TYPE);
 421         strcpy((char *)info->name, "Whole Disk");
 422         disk_partition_clr_uuid(info);
 423         disk_partition_clr_type_guid(info);
 424
 425         return 0;
 426 }
 427
 428 int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
 429                           struct blk_desc **desc)
 430 {
 431         char *ep;
 432         char *dup_str = NULL;
 433         const char *dev_str, *hwpart_str;
 434         int dev, hwpart;
 435
 436         hwpart_str = strchr(dev_hwpart_str, '.');
 437         if (hwpart_str) {
 438                 dup_str = strdup(dev_hwpart_str);
 439                 dup_str[hwpart_str - dev_hwpart_str] = 0;
 440                 dev_str = dup_str;
 441                 hwpart_str++;
 442         } else {
 443                 dev_str = dev_hwpart_str;
 444                 hwpart = 0;
 445         }
 446
 447         dev = hextoul(dev_str, &ep);
 448         if (*ep) {
 449                 printf("** Bad device specification %s %s **\n",
 450                        ifname, dev_str);
 451                 dev = -EINVAL;
 452                 goto cleanup;
 453         }
 454
 455         if (hwpart_str) {
 456                 hwpart = hextoul(hwpart_str, &ep);
 457                 if (*ep) {
 458                         printf("** Bad HW partition specification %s %s **\n",
 459                             ifname, hwpart_str);
 460                         dev = -EINVAL;
 461                         goto cleanup;
 462                 }
 463         }
 464
 465         *desc = get_dev_hwpart(ifname, dev, hwpart);
 466         if (!(*desc) || ((*desc)->type == DEV_TYPE_UNKNOWN)) {
 467                 debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
 468                 dev = -ENODEV;
 469                 goto cleanup;
 470         }
 471
 472         if (blk_enabled()) {
 473                 /*
 474                  * Updates the partition table for the specified hw partition.
 475                  * Always should be done, otherwise hw partition 0 will return
 476                  * stale data after displaying a non-zero hw partition.
 477                  */
 478                 if ((*desc)->uclass_id == UCLASS_MMC)
 479                         part_init(*desc);
 480         }
 481
 482 cleanup:
 483         free(dup_str);
 484         return dev;
 485 }
 486
 487 #define PART_UNSPECIFIED -2
 488 #define PART_AUTO -1
 489 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 490                              struct blk_desc **desc,
 491                              struct disk_partition *info, int allow_whole_dev)
 492 {
 493         int ret;
 494         const char *part_str;
 495         char *dup_str = NULL;
 496         const char *dev_str;
 497         int dev;
 498         char *ep;
 499         int p;
 500         int part;
 501         struct disk_partition tmpinfo;
 502
 503         *desc = NULL;
 504         memset(info, 0, sizeof(*info));
 505
 506 #if IS_ENABLED(CONFIG_SANDBOX) || IS_ENABLED(CONFIG_SEMIHOSTING)
 507         /*
 508          * Special-case a pseudo block device "hostfs", to allow access to the
 509          * host's own filesystem.
 510          */
 511         if (!strcmp(ifname, "hostfs")) {
 512                 strcpy((char *)info->type, BOOT_PART_TYPE);
 513                 strcpy((char *)info->name, "Host filesystem");
 514
 515                 return 0;
 516         }
 517 #endif
 518
 519 #if IS_ENABLED(CONFIG_CMD_UBIFS) && !IS_ENABLED(CONFIG_SPL_BUILD)
 520         /*
 521          * Special-case ubi, ubi goes through a mtd, rather than through
 522          * a regular block device.
 523          */
 524         if (!strcmp(ifname, "ubi")) {
 525                 if (!ubifs_is_mounted()) {
 526                         printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
 527                         return -EINVAL;
 528                 }
 529
 530                 strcpy((char *)info->type, BOOT_PART_TYPE);
 531                 strcpy((char *)info->name, "UBI");
 532                 return 0;
 533         }
 534 #endif
 535
 536         /* If no dev_part_str, use bootdevice environment variable */
 537         if (CONFIG_IS_ENABLED(ENV_SUPPORT)) {
 538                 if (!dev_part_str || !strlen(dev_part_str) ||
 539                     !strcmp(dev_part_str, "-"))
 540                         dev_part_str = env_get("bootdevice");
 541         }
 542
 543         /* If still no dev_part_str, it's an error */
 544         if (!dev_part_str) {
 545                 printf("** No device specified **\n");
 546                 ret = -ENODEV;
 547                 goto cleanup;
 548         }
 549
 550         /* Separate device and partition ID specification */
 551         part_str = strchr(dev_part_str, ':');
 552         if (part_str) {
 553                 dup_str = strdup(dev_part_str);
 554                 dup_str[part_str - dev_part_str] = 0;
 555                 dev_str = dup_str;
 556                 part_str++;
 557         } else {
 558                 dev_str = dev_part_str;
 559         }
 560
 561         /* Look up the device */
 562         dev = blk_get_device_by_str(ifname, dev_str, desc);
 563         if (dev < 0) {
 564                 printf("** Bad device specification %s %s **\n",
 565                        ifname, dev_str);
 566                 ret = dev;
 567                 goto cleanup;
 568         }
 569
 570         /* Convert partition ID string to number */
 571         if (!part_str || !*part_str) {
 572                 part = PART_UNSPECIFIED;
 573         } else if (!strcmp(part_str, "auto")) {
 574                 part = PART_AUTO;
 575         } else {
 576                 /* Something specified -> use exactly that */
 577                 part = (int)hextoul(part_str, &ep);
 578                 /*
 579                  * Less than whole string converted,
 580                  * or request for whole device, but caller requires partition.
 581                  */
 582                 if (*ep || (part == 0 && !allow_whole_dev)) {
 583                         printf("** Bad partition specification %s %s **\n",
 584                             ifname, dev_part_str);
 585                         ret = -ENOENT;
 586                         goto cleanup;
 587                 }
 588         }
 589
 590         /*
 591          * No partition table on device,
 592          * or user requested partition 0 (entire device).
 593          */
 594         if (((*desc)->part_type == PART_TYPE_UNKNOWN) || !part) {
 595                 if (!(*desc)->lba) {
 596                         printf("** Bad device size - %s %s **\n", ifname,
 597                                dev_str);
 598                         ret = -EINVAL;
 599                         goto cleanup;
 600                 }
 601
 602                 /*
 603                  * If user specified a partition ID other than 0,
 604                  * or the calling command only accepts partitions,
 605                  * it's an error.
 606                  */
 607                 if ((part > 0) || (!allow_whole_dev)) {
 608                         printf("** No partition table - %s %s **\n", ifname,
 609                                dev_str);
 610                         ret = -EPROTONOSUPPORT;
 611                         goto cleanup;
 612                 }
 613
 614                 (*desc)->log2blksz = LOG2((*desc)->blksz);
 615
 616                 part_get_info_whole_disk(*desc, info);
 617
 618                 ret = 0;
 619                 goto cleanup;
 620         }
 621
 622         /*
 623          * Now there's known to be a partition table,
 624          * not specifying a partition means to pick partition 1.
 625          */
 626         if (part == PART_UNSPECIFIED)
 627                 part = 1;
 628
 629         /*
 630          * If user didn't specify a partition number, or did specify something
 631          * other than "auto", use that partition number directly.
 632          */
 633         if (part != PART_AUTO) {
 634                 ret = part_get_info(*desc, part, info);
 635                 if (ret) {
 636                         printf("** Invalid partition %d **\n", part);
 637                         goto cleanup;
 638                 }
 639         } else {
 640                 /*
 641                  * Find the first bootable partition.
 642                  * If none are bootable, fall back to the first valid partition.
 643                  */
 644                 part = 0;
 645                 for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
 646                         ret = part_get_info(*desc, p, info);
 647                         if (ret)
 648                                 continue;
 649
 650                         /*
 651                          * First valid partition, or new better partition?
 652                          * If so, save partition ID.
 653                          */
 654                         if (!part || info->bootable)
 655                                 part = p;
 656
 657                         /* Best possible partition? Stop searching. */
 658                         if (info->bootable)
 659                                 break;
 660
 661                         /*
 662                          * We now need to search further for best possible.
 663                          * If we what we just queried was the best so far,
 664                          * save the info since we over-write it next loop.
 665                          */
 666                         if (part == p)
 667                                 tmpinfo = *info;
 668                 }
 669                 /* If we found any acceptable partition */
 670                 if (part) {
 671                         /*
 672                          * If we searched all possible partition IDs,
 673                          * return the first valid partition we found.
 674                          */
 675                         if (p == MAX_SEARCH_PARTITIONS + 1)
 676                                 *info = tmpinfo;
 677                 } else {
 678                         printf("** No valid partitions found **\n");
 679                         goto cleanup;
 680                 }
 681         }
 682         if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
 683                 printf("** Invalid partition type \"%.32s\""
 684                         " (expect \"" BOOT_PART_TYPE "\")\n",
 685                         info->type);
 686                 ret  = -EINVAL;
 687                 goto cleanup;
 688         }
 689
 690         (*desc)->log2blksz = LOG2((*desc)->blksz);
 691
 692         ret = part;
 693         goto cleanup;
 694
 695 cleanup:
 696         free(dup_str);
 697         return ret;
 698 }
 699
 700 int part_get_info_by_name(struct blk_desc *desc, const char *name,
 701                           struct disk_partition *info)
 702 {
 703         struct part_driver *part_drv;
 704         int ret;
 705         int i;
 706
 707         part_drv = part_driver_lookup_type(desc);
 708         if (!part_drv)
 709                 return -1;
 710
 711         if (!part_drv->get_info) {
 712                 log_debug("## Driver %s does not have the get_info() method\n",
 713                           part_drv->name);
 714                 return -ENOSYS;
 715         }
 716
 717         for (i = 1; i < part_drv->max_entries; i++) {
 718                 ret = part_drv->get_info(desc, i, info);
 719                 if (ret != 0) {
 720                         /*
 721                          * Partition with this index can't be obtained, but
 722                          * further partitions might be, so keep checking.
 723                          */
 724                         continue;
 725                 }
 726                 if (strcmp(name, (const char *)info->name) == 0) {
 727                         /* matched */
 728                         return i;
 729                 }
 730         }
 731
 732         return -ENOENT;
 733 }
 734
 735 /**
 736  * Get partition info from device number and partition name.
 737  *
 738  * Parse a device number and partition name string in the form of
 739  * "devicenum.hwpartnum#partition_name", for example "0.1#misc". devicenum and
 740  * hwpartnum are both optional, defaulting to 0. If the partition is found,
 741  * sets desc and part_info accordingly with the information of the
 742  * partition with the given partition_name.
 743  *
 744  * @param[in] dev_iface Device interface
 745  * @param[in] dev_part_str Input string argument, like "0.1#misc"
 746  * @param[out] desc Place to store the device description pointer
 747  * @param[out] part_info Place to store the partition information
 748  * Return: 0 on success, or a negative on error
 749  */
 750 static int part_get_info_by_dev_and_name(const char *dev_iface,
 751                                          const char *dev_part_str,
 752                                          struct blk_desc **desc,
 753                                          struct disk_partition *part_info)
 754 {
 755         char *dup_str = NULL;
 756         const char *dev_str, *part_str;
 757         int ret;
 758
 759         /* Separate device and partition name specification */
 760         if (dev_part_str)
 761                 part_str = strchr(dev_part_str, '#');
 762         else
 763                 part_str = NULL;
 764
 765         if (part_str) {
 766                 dup_str = strdup(dev_part_str);
 767                 dup_str[part_str - dev_part_str] = 0;
 768                 dev_str = dup_str;
 769                 part_str++;
 770         } else {
 771                 return -EINVAL;
 772         }
 773
 774         ret = blk_get_device_by_str(dev_iface, dev_str, desc);
 775         if (ret < 0)
 776                 goto cleanup;
 777
 778         ret = part_get_info_by_name(*desc, part_str, part_info);
 779         if (ret < 0)
 780                 printf("Could not find \"%s\" partition\n", part_str);
 781
 782 cleanup:
 783         free(dup_str);
 784         return ret;
 785 }
 786
 787 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 788                                          const char *dev_part_str,
 789                                          struct blk_desc **desc,
 790                                          struct disk_partition *part_info,
 791                                          int allow_whole_dev)
 792 {
 793         int ret;
 794
 795         /* Split the part_name if passed as "$dev_num#part_name". */
 796         ret = part_get_info_by_dev_and_name(dev_iface, dev_part_str, desc,
 797                                             part_info);
 798         if (ret >= 0)
 799                 return ret;
 800         /*
 801          * Couldn't lookup by name, try looking up the partition description
 802          * directly.
 803          */
 804         ret = blk_get_device_part_str(dev_iface, dev_part_str, desc, part_info,
 805                                       allow_whole_dev);
 806         if (ret < 0)
 807                 printf("Couldn't find partition %s %s\n",
 808                        dev_iface, dev_part_str);
 809         return ret;
 810 }
 811
 812 void part_set_generic_name(const struct blk_desc *desc, int part_num,
 813                            char *name)
 814 {
 815         char *devtype;
 816
 817         switch (desc->uclass_id) {
 818         case UCLASS_IDE:
 819         case UCLASS_AHCI:
 820                 devtype = "hd";
 821                 break;
 822         case UCLASS_SCSI:
 823                 devtype = "sd";
 824                 break;
 825         case UCLASS_USB:
 826                 devtype = "usbd";
 827                 break;
 828         case UCLASS_MMC:
 829                 devtype = "mmcsd";
 830                 break;
 831         default:
 832                 devtype = "xx";
 833                 break;
 834         }
 835
 836         sprintf(name, "%s%c%d", devtype, 'a' + desc->devnum, part_num);
 837 }
 838
 839 int part_get_bootable(struct blk_desc *desc)
 840 {
 841         struct disk_partition info;
 842         int p;
 843
 844         for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
 845                 int ret;
 846
 847                 ret = part_get_info(desc, p, &info);
 848                 if (!ret && info.bootable)
 849                         return p;
 850         }
 851
 852         return 0;
 853 }