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