scsi/utils.c

   1 /*
   2  *  SCSI helpers
   3  *
   4  *  Copyright 2017 Red Hat, Inc.
   5  *
   6  *  Authors:
   7  *   Fam Zheng <famz@redhat.com>
   8  *   Paolo Bonzini <pbonzini@redhat.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  */
  15
  16 #include "qemu/osdep.h"
  17 #include "scsi/constants.h"
  18 #include "scsi/utils.h"
  19 #include "qemu/bswap.h"
  20
  21 uint32_t scsi_data_cdb_xfer(uint8_t *buf)
  22 {
  23     if ((buf[0] >> 5) == 0 && buf[4] == 0) {
  24         return 256;
  25     } else {
  26         return scsi_cdb_xfer(buf);
  27     }
  28 }
  29
  30 uint32_t scsi_cdb_xfer(uint8_t *buf)
  31 {
  32     switch (buf[0] >> 5) {
  33     case 0:
  34         return buf[4];
  35     case 1:
  36     case 2:
  37         return lduw_be_p(&buf[7]);
  38     case 4:
  39         return ldl_be_p(&buf[10]) & 0xffffffffULL;
  40     case 5:
  41         return ldl_be_p(&buf[6]) & 0xffffffffULL;
  42     default:
  43         return -1;
  44     }
  45 }
  46
  47 uint64_t scsi_cmd_lba(SCSICommand *cmd)
  48 {
  49     uint8_t *buf = cmd->buf;
  50     uint64_t lba;
  51
  52     switch (buf[0] >> 5) {
  53     case 0:
  54         lba = ldl_be_p(&buf[0]) & 0x1fffff;
  55         break;
  56     case 1:
  57     case 2:
  58     case 5:
  59         lba = ldl_be_p(&buf[2]) & 0xffffffffULL;
  60         break;
  61     case 4:
  62         lba = ldq_be_p(&buf[2]);
  63         break;
  64     default:
  65         lba = -1;
  66
  67     }
  68     return lba;
  69 }
  70
  71 int scsi_cdb_length(uint8_t *buf)
  72 {
  73     int cdb_len;
  74
  75     switch (buf[0] >> 5) {
  76     case 0:
  77         cdb_len = 6;
  78         break;
  79     case 1:
  80     case 2:
  81         cdb_len = 10;
  82         break;
  83     case 4:
  84         cdb_len = 16;
  85         break;
  86     case 5:
  87         cdb_len = 12;
  88         break;
  89     default:
  90         cdb_len = -1;
  91     }
  92     return cdb_len;
  93 }
  94
  95 SCSISense scsi_parse_sense_buf(const uint8_t *in_buf, int in_len)
  96 {
  97     bool fixed_in;
  98     SCSISense sense;
  99
 100     assert(in_len > 0);
 101     fixed_in = (in_buf[0] & 2) == 0;
 102     if (fixed_in) {
 103         if (in_len < 14) {
 104             return SENSE_CODE(IO_ERROR);
 105         }
 106         sense.key = in_buf[2];
 107         sense.asc = in_buf[12];
 108         sense.ascq = in_buf[13];
 109     } else {
 110         if (in_len < 4) {
 111             return SENSE_CODE(IO_ERROR);
 112         }
 113         sense.key = in_buf[1];
 114         sense.asc = in_buf[2];
 115         sense.ascq = in_buf[3];
 116     }
 117
 118     return sense;
 119 }
 120
 121 int scsi_build_sense_buf(uint8_t *out_buf, size_t size, SCSISense sense,
 122                          bool fixed_sense)
 123 {
 124     int len;
 125     uint8_t buf[SCSI_SENSE_LEN] = { 0 };
 126
 127     if (fixed_sense) {
 128         buf[0] = 0x70;
 129         buf[2] = sense.key;
 130         buf[7] = 10;
 131         buf[12] = sense.asc;
 132         buf[13] = sense.ascq;
 133         len = 18;
 134     } else {
 135         buf[0] = 0x72;
 136         buf[1] = sense.key;
 137         buf[2] = sense.asc;
 138         buf[3] = sense.ascq;
 139         len = 8;
 140     }
 141     len = MIN(len, size);
 142     memcpy(out_buf, buf, len);
 143     return len;
 144 }
 145
 146 int scsi_build_sense(uint8_t *buf, SCSISense sense)
 147 {
 148     return scsi_build_sense_buf(buf, SCSI_SENSE_LEN, sense, true);
 149 }
 150
 151 /*
 152  * Predefined sense codes
 153  */
 154
 155 /* No sense data available */
 156 const struct SCSISense sense_code_NO_SENSE = {
 157     .key = NO_SENSE , .asc = 0x00 , .ascq = 0x00
 158 };
 159
 160 /* LUN not ready, Manual intervention required */
 161 const struct SCSISense sense_code_LUN_NOT_READY = {
 162     .key = NOT_READY, .asc = 0x04, .ascq = 0x03
 163 };
 164
 165 /* LUN not ready, Medium not present */
 166 const struct SCSISense sense_code_NO_MEDIUM = {
 167     .key = NOT_READY, .asc = 0x3a, .ascq = 0x00
 168 };
 169
 170 /* LUN not ready, medium removal prevented */
 171 const struct SCSISense sense_code_NOT_READY_REMOVAL_PREVENTED = {
 172     .key = NOT_READY, .asc = 0x53, .ascq = 0x02
 173 };
 174
 175 /* Hardware error, internal target failure */
 176 const struct SCSISense sense_code_TARGET_FAILURE = {
 177     .key = HARDWARE_ERROR, .asc = 0x44, .ascq = 0x00
 178 };
 179
 180 /* Illegal request, invalid command operation code */
 181 const struct SCSISense sense_code_INVALID_OPCODE = {
 182     .key = ILLEGAL_REQUEST, .asc = 0x20, .ascq = 0x00
 183 };
 184
 185 /* Illegal request, LBA out of range */
 186 const struct SCSISense sense_code_LBA_OUT_OF_RANGE = {
 187     .key = ILLEGAL_REQUEST, .asc = 0x21, .ascq = 0x00
 188 };
 189
 190 /* Illegal request, Invalid field in CDB */
 191 const struct SCSISense sense_code_INVALID_FIELD = {
 192     .key = ILLEGAL_REQUEST, .asc = 0x24, .ascq = 0x00
 193 };
 194
 195 /* Illegal request, Invalid field in parameter list */
 196 const struct SCSISense sense_code_INVALID_PARAM = {
 197     .key = ILLEGAL_REQUEST, .asc = 0x26, .ascq = 0x00
 198 };
 199
 200 /* Illegal request, Parameter list length error */
 201 const struct SCSISense sense_code_INVALID_PARAM_LEN = {
 202     .key = ILLEGAL_REQUEST, .asc = 0x1a, .ascq = 0x00
 203 };
 204
 205 /* Illegal request, LUN not supported */
 206 const struct SCSISense sense_code_LUN_NOT_SUPPORTED = {
 207     .key = ILLEGAL_REQUEST, .asc = 0x25, .ascq = 0x00
 208 };
 209
 210 /* Illegal request, Saving parameters not supported */
 211 const struct SCSISense sense_code_SAVING_PARAMS_NOT_SUPPORTED = {
 212     .key = ILLEGAL_REQUEST, .asc = 0x39, .ascq = 0x00
 213 };
 214
 215 /* Illegal request, Incompatible medium installed */
 216 const struct SCSISense sense_code_INCOMPATIBLE_FORMAT = {
 217     .key = ILLEGAL_REQUEST, .asc = 0x30, .ascq = 0x00
 218 };
 219
 220 /* Illegal request, medium removal prevented */
 221 const struct SCSISense sense_code_ILLEGAL_REQ_REMOVAL_PREVENTED = {
 222     .key = ILLEGAL_REQUEST, .asc = 0x53, .ascq = 0x02
 223 };
 224
 225 /* Illegal request, Invalid Transfer Tag */
 226 const struct SCSISense sense_code_INVALID_TAG = {
 227     .key = ILLEGAL_REQUEST, .asc = 0x4b, .ascq = 0x01
 228 };
 229
 230 /* Command aborted, I/O process terminated */
 231 const struct SCSISense sense_code_IO_ERROR = {
 232     .key = ABORTED_COMMAND, .asc = 0x00, .ascq = 0x06
 233 };
 234
 235 /* Command aborted, I_T Nexus loss occurred */
 236 const struct SCSISense sense_code_I_T_NEXUS_LOSS = {
 237     .key = ABORTED_COMMAND, .asc = 0x29, .ascq = 0x07
 238 };
 239
 240 /* Command aborted, Logical Unit failure */
 241 const struct SCSISense sense_code_LUN_FAILURE = {
 242     .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
 243 };
 244
 245 /* Command aborted, Overlapped Commands Attempted */
 246 const struct SCSISense sense_code_OVERLAPPED_COMMANDS = {
 247     .key = ABORTED_COMMAND, .asc = 0x4e, .ascq = 0x00
 248 };
 249
 250 /* Command aborted, LUN Communication Failure */
 251 const struct SCSISense sense_code_LUN_COMM_FAILURE = {
 252     .key = ABORTED_COMMAND, .asc = 0x08, .ascq = 0x00
 253 };
 254
 255 /* Medium Error, Unrecovered read error */
 256 const struct SCSISense sense_code_READ_ERROR = {
 257     .key = MEDIUM_ERROR, .asc = 0x11, .ascq = 0x00
 258 };
 259
 260 /* Not ready, Cause not reportable */
 261 const struct SCSISense sense_code_NOT_READY = {
 262     .key = NOT_READY, .asc = 0x04, .ascq = 0x00
 263 };
 264
 265 /* Unit attention, Capacity data has changed */
 266 const struct SCSISense sense_code_CAPACITY_CHANGED = {
 267     .key = UNIT_ATTENTION, .asc = 0x2a, .ascq = 0x09
 268 };
 269
 270 /* Unit attention, Power on, reset or bus device reset occurred */
 271 const struct SCSISense sense_code_RESET = {
 272     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
 273 };
 274
 275 /* Unit attention, SCSI bus reset */
 276 const struct SCSISense sense_code_SCSI_BUS_RESET = {
 277     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x02
 278 };
 279
 280 /* Unit attention, No medium */
 281 const struct SCSISense sense_code_UNIT_ATTENTION_NO_MEDIUM = {
 282     .key = UNIT_ATTENTION, .asc = 0x3a, .ascq = 0x00
 283 };
 284
 285 /* Unit attention, Medium may have changed */
 286 const struct SCSISense sense_code_MEDIUM_CHANGED = {
 287     .key = UNIT_ATTENTION, .asc = 0x28, .ascq = 0x00
 288 };
 289
 290 /* Unit attention, Reported LUNs data has changed */
 291 const struct SCSISense sense_code_REPORTED_LUNS_CHANGED = {
 292     .key = UNIT_ATTENTION, .asc = 0x3f, .ascq = 0x0e
 293 };
 294
 295 /* Unit attention, Device internal reset */
 296 const struct SCSISense sense_code_DEVICE_INTERNAL_RESET = {
 297     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x04
 298 };
 299
 300 /* Data Protection, Write Protected */
 301 const struct SCSISense sense_code_WRITE_PROTECTED = {
 302     .key = DATA_PROTECT, .asc = 0x27, .ascq = 0x00
 303 };
 304
 305 /* Data Protection, Space Allocation Failed Write Protect */
 306 const struct SCSISense sense_code_SPACE_ALLOC_FAILED = {
 307     .key = DATA_PROTECT, .asc = 0x27, .ascq = 0x07
 308 };
 309
 310 /*
 311  * scsi_convert_sense
 312  *
 313  * Convert between fixed and descriptor sense buffers
 314  */
 315 int scsi_convert_sense(uint8_t *in_buf, int in_len,
 316                        uint8_t *buf, int len, bool fixed)
 317 {
 318     SCSISense sense;
 319     bool fixed_in;
 320
 321     if (in_len == 0) {
 322         return scsi_build_sense_buf(buf, len, SENSE_CODE(NO_SENSE), fixed);
 323     }
 324
 325     fixed_in = (in_buf[0] & 2) == 0;
 326     if (fixed == fixed_in) {
 327         memcpy(buf, in_buf, MIN(len, in_len));
 328         return MIN(len, in_len);
 329     } else {
 330         sense = scsi_parse_sense_buf(in_buf, in_len);
 331         return scsi_build_sense_buf(buf, len, sense, fixed);
 332     }
 333 }
 334
 335 static bool scsi_sense_is_guest_recoverable(int key, int asc, int ascq)
 336 {
 337     switch (key) {
 338     case NO_SENSE:
 339     case RECOVERED_ERROR:
 340     case UNIT_ATTENTION:
 341     case ABORTED_COMMAND:
 342         return true;
 343     case NOT_READY:
 344     case ILLEGAL_REQUEST:
 345     case DATA_PROTECT:
 346         /* Parse ASCQ */
 347         break;
 348     default:
 349         return false;
 350     }
 351
 352     switch ((asc << 8) | ascq) {
 353     case 0x1a00: /* PARAMETER LIST LENGTH ERROR */
 354     case 0x2000: /* INVALID OPERATION CODE */
 355     case 0x2400: /* INVALID FIELD IN CDB */
 356     case 0x2500: /* LOGICAL UNIT NOT SUPPORTED */
 357     case 0x2600: /* INVALID FIELD IN PARAMETER LIST */
 358
 359     case 0x2104: /* UNALIGNED WRITE COMMAND */
 360     case 0x2105: /* WRITE BOUNDARY VIOLATION */
 361     case 0x2106: /* ATTEMPT TO READ INVALID DATA */
 362     case 0x550e: /* INSUFFICIENT ZONE RESOURCES */
 363
 364     case 0x0401: /* NOT READY, IN PROGRESS OF BECOMING READY */
 365     case 0x0402: /* NOT READY, INITIALIZING COMMAND REQUIRED */
 366         return true;
 367     default:
 368         return false;
 369     }
 370 }
 371
 372 int scsi_sense_to_errno(int key, int asc, int ascq)
 373 {
 374     switch (key) {
 375     case NO_SENSE:
 376     case RECOVERED_ERROR:
 377     case UNIT_ATTENTION:
 378         return EAGAIN;
 379     case ABORTED_COMMAND: /* COMMAND ABORTED */
 380         return ECANCELED;
 381     case NOT_READY:
 382     case ILLEGAL_REQUEST:
 383     case DATA_PROTECT:
 384         /* Parse ASCQ */
 385         break;
 386     default:
 387         return EIO;
 388     }
 389     switch ((asc << 8) | ascq) {
 390     case 0x1a00: /* PARAMETER LIST LENGTH ERROR */
 391     case 0x2000: /* INVALID OPERATION CODE */
 392     case 0x2400: /* INVALID FIELD IN CDB */
 393     case 0x2600: /* INVALID FIELD IN PARAMETER LIST */
 394         return EINVAL;
 395     case 0x2100: /* LBA OUT OF RANGE */
 396     case 0x2707: /* SPACE ALLOC FAILED */
 397         return ENOSPC;
 398     case 0x2500: /* LOGICAL UNIT NOT SUPPORTED */
 399         return ENOTSUP;
 400     case 0x3a00: /* MEDIUM NOT PRESENT */
 401     case 0x3a01: /* MEDIUM NOT PRESENT TRAY CLOSED */
 402     case 0x3a02: /* MEDIUM NOT PRESENT TRAY OPEN */
 403         return ENOMEDIUM;
 404     case 0x2700: /* WRITE PROTECTED */
 405         return EACCES;
 406     case 0x0401: /* NOT READY, IN PROGRESS OF BECOMING READY */
 407         return EINPROGRESS;
 408     case 0x0402: /* NOT READY, INITIALIZING COMMAND REQUIRED */
 409         return ENOTCONN;
 410     default:
 411         return EIO;
 412     }
 413 }
 414
 415 int scsi_sense_buf_to_errno(const uint8_t *in_buf, size_t in_len)
 416 {
 417     SCSISense sense;
 418     if (in_len < 1) {
 419         return EIO;
 420     }
 421
 422     sense = scsi_parse_sense_buf(in_buf, in_len);
 423     return scsi_sense_to_errno(sense.key, sense.asc, sense.ascq);
 424 }
 425
 426 bool scsi_sense_buf_is_guest_recoverable(const uint8_t *in_buf, size_t in_len)
 427 {
 428     SCSISense sense;
 429     if (in_len < 1) {
 430         return false;
 431     }
 432
 433     sense = scsi_parse_sense_buf(in_buf, in_len);
 434     return scsi_sense_is_guest_recoverable(sense.key, sense.asc, sense.ascq);
 435 }
 436
 437 const char *scsi_command_name(uint8_t cmd)
 438 {
 439     static const char *names[] = {
 440         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
 441         [ REWIND                   ] = "REWIND",
 442         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
 443         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
 444         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
 445         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS/INITIALIZE ELEMENT STATUS",
 446         /* LOAD_UNLOAD and INITIALIZE_ELEMENT_STATUS use the same operation code */
 447         [ READ_6                   ] = "READ_6",
 448         [ WRITE_6                  ] = "WRITE_6",
 449         [ SET_CAPACITY             ] = "SET_CAPACITY",
 450         [ READ_REVERSE             ] = "READ_REVERSE",
 451         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
 452         [ SPACE                    ] = "SPACE",
 453         [ INQUIRY                  ] = "INQUIRY",
 454         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
 455         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
 456         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
 457         [ MODE_SELECT              ] = "MODE_SELECT",
 458         [ RESERVE                  ] = "RESERVE",
 459         [ RELEASE                  ] = "RELEASE",
 460         [ COPY                     ] = "COPY",
 461         [ ERASE                    ] = "ERASE",
 462         [ MODE_SENSE               ] = "MODE_SENSE",
 463         [ START_STOP               ] = "START_STOP/LOAD_UNLOAD",
 464         /* LOAD_UNLOAD and START_STOP use the same operation code */
 465         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
 466         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
 467         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
 468         [ READ_CAPACITY_10         ] = "READ_CAPACITY_10",
 469         [ READ_10                  ] = "READ_10",
 470         [ WRITE_10                 ] = "WRITE_10",
 471         [ SEEK_10                  ] = "SEEK_10/POSITION_TO_ELEMENT",
 472         /* SEEK_10 and POSITION_TO_ELEMENT use the same operation code */
 473         [ WRITE_VERIFY_10          ] = "WRITE_VERIFY_10",
 474         [ VERIFY_10                ] = "VERIFY_10",
 475         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
 476         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
 477         [ SEARCH_LOW               ] = "SEARCH_LOW",
 478         [ SET_LIMITS               ] = "SET_LIMITS",
 479         [ PRE_FETCH                ] = "PRE_FETCH/READ_POSITION",
 480         /* READ_POSITION and PRE_FETCH use the same operation code */
 481         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
 482         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
 483         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA/INITIALIZE_ELEMENT_STATUS_WITH_RANGE",
 484         /* READ_DEFECT_DATA and INITIALIZE_ELEMENT_STATUS_WITH_RANGE use the same operation code */
 485         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
 486         [ COMPARE                  ] = "COMPARE",
 487         [ COPY_VERIFY              ] = "COPY_VERIFY",
 488         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
 489         [ READ_BUFFER              ] = "READ_BUFFER",
 490         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
 491         [ READ_LONG_10             ] = "READ_LONG_10",
 492         [ WRITE_LONG_10            ] = "WRITE_LONG_10",
 493         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
 494         [ WRITE_SAME_10            ] = "WRITE_SAME_10",
 495         [ UNMAP                    ] = "UNMAP",
 496         [ READ_TOC                 ] = "READ_TOC",
 497         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
 498         [ SANITIZE                 ] = "SANITIZE",
 499         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
 500         [ LOG_SELECT               ] = "LOG_SELECT",
 501         [ LOG_SENSE                ] = "LOG_SENSE",
 502         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
 503         [ RESERVE_10               ] = "RESERVE_10",
 504         [ RELEASE_10               ] = "RELEASE_10",
 505         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
 506         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
 507         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
 508         [ WRITE_FILEMARKS_16       ] = "WRITE_FILEMARKS_16",
 509         [ EXTENDED_COPY            ] = "EXTENDED_COPY",
 510         [ ATA_PASSTHROUGH_16       ] = "ATA_PASSTHROUGH_16",
 511         [ ACCESS_CONTROL_IN        ] = "ACCESS_CONTROL_IN",
 512         [ ACCESS_CONTROL_OUT       ] = "ACCESS_CONTROL_OUT",
 513         [ READ_16                  ] = "READ_16",
 514         [ COMPARE_AND_WRITE        ] = "COMPARE_AND_WRITE",
 515         [ WRITE_16                 ] = "WRITE_16",
 516         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
 517         [ VERIFY_16                ] = "VERIFY_16",
 518         [ PRE_FETCH_16             ] = "PRE_FETCH_16",
 519         [ SYNCHRONIZE_CACHE_16     ] = "SPACE_16/SYNCHRONIZE_CACHE_16",
 520         /* SPACE_16 and SYNCHRONIZE_CACHE_16 use the same operation code */
 521         [ LOCATE_16                ] = "LOCATE_16",
 522         [ WRITE_SAME_16            ] = "ERASE_16/WRITE_SAME_16",
 523         /* ERASE_16 and WRITE_SAME_16 use the same operation code */
 524         [ SERVICE_ACTION_IN_16     ] = "SERVICE_ACTION_IN_16",
 525         [ WRITE_LONG_16            ] = "WRITE_LONG_16",
 526         [ REPORT_LUNS              ] = "REPORT_LUNS",
 527         [ ATA_PASSTHROUGH_12       ] = "BLANK/ATA_PASSTHROUGH_12",
 528         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
 529         [ EXCHANGE_MEDIUM          ] = "EXCHANGE MEDIUM",
 530         [ READ_12                  ] = "READ_12",
 531         [ WRITE_12                 ] = "WRITE_12",
 532         [ ERASE_12                 ] = "ERASE_12/GET_PERFORMANCE",
 533         /* ERASE_12 and GET_PERFORMANCE use the same operation code */
 534         [ SERVICE_ACTION_IN_12     ] = "SERVICE_ACTION_IN_12",
 535         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
 536         [ VERIFY_12                ] = "VERIFY_12",
 537         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
 538         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
 539         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
 540         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
 541         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG/SET_STREAMING",
 542         /* SEND_VOLUME_TAG and SET_STREAMING use the same operation code */
 543         [ READ_CD                  ] = "READ_CD",
 544         [ READ_DEFECT_DATA_12      ] = "READ_DEFECT_DATA_12",
 545         [ READ_DVD_STRUCTURE       ] = "READ_DVD_STRUCTURE",
 546         [ RESERVE_TRACK            ] = "RESERVE_TRACK",
 547         [ SEND_CUE_SHEET           ] = "SEND_CUE_SHEET",
 548         [ SEND_DVD_STRUCTURE       ] = "SEND_DVD_STRUCTURE",
 549         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
 550         [ SET_READ_AHEAD           ] = "SET_READ_AHEAD",
 551         [ ALLOW_OVERWRITE          ] = "ALLOW_OVERWRITE",
 552         [ MECHANISM_STATUS         ] = "MECHANISM_STATUS",
 553         [ GET_EVENT_STATUS_NOTIFICATION ] = "GET_EVENT_STATUS_NOTIFICATION",
 554         [ READ_DISC_INFORMATION    ] = "READ_DISC_INFORMATION",
 555     };
 556
 557     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL) {
 558         return "*UNKNOWN*";
 559     }
 560     return names[cmd];
 561 }
 562
 563 #ifdef CONFIG_LINUX
 564 int sg_io_sense_from_errno(int errno_value, struct sg_io_hdr *io_hdr,
 565                            SCSISense *sense)
 566 {
 567     if (errno_value != 0) {
 568         switch (errno_value) {
 569         case EDOM:
 570             return TASK_SET_FULL;
 571         case ENOMEM:
 572             *sense = SENSE_CODE(TARGET_FAILURE);
 573             return CHECK_CONDITION;
 574         default:
 575             *sense = SENSE_CODE(IO_ERROR);
 576             return CHECK_CONDITION;
 577         }
 578     } else {
 579         if (io_hdr->host_status == SG_ERR_DID_NO_CONNECT ||
 580             io_hdr->host_status == SG_ERR_DID_BUS_BUSY ||
 581             io_hdr->host_status == SG_ERR_DID_TIME_OUT ||
 582             (io_hdr->driver_status & SG_ERR_DRIVER_TIMEOUT)) {
 583             return BUSY;
 584         } else if (io_hdr->host_status) {
 585             *sense = SENSE_CODE(I_T_NEXUS_LOSS);
 586             return CHECK_CONDITION;
 587         } else if (io_hdr->status) {
 588             return io_hdr->status;
 589         } else if (io_hdr->driver_status & SG_ERR_DRIVER_SENSE) {
 590             return CHECK_CONDITION;
 591         } else {
 592             return GOOD;
 593         }
 594     }
 595 }
 596 #endif