disk/part.c

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