include/scsi/scsi.h

   1 /*
   2  * This header file contains public constants and structures used by
   3  * the scsi code for linux.
   4  *
   5  * For documentation on the OPCODES, MESSAGES, and SENSE values,
   6  * please consult the SCSI standard.
   7  */
   8 #ifndef _SCSI_SCSI_H
   9 #define _SCSI_SCSI_H
  10
  11 #include <linux/types.h>
  12
  13 struct scsi_cmnd;
  14
  15 /*
  16  * The maximum number of SG segments that we will put inside a
  17  * scatterlist (unless chaining is used). Should ideally fit inside a
  18  * single page, to avoid a higher order allocation.  We could define this
  19  * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order.  The
  20  * minimum value is 32
  21  */
  22 #define SCSI_MAX_SG_SEGMENTS    128
  23
  24 /*
  25  * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
  26  * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
  27  */
  28 #ifdef ARCH_HAS_SG_CHAIN
  29 #define SCSI_MAX_SG_CHAIN_SEGMENTS      2048
  30 #else
  31 #define SCSI_MAX_SG_CHAIN_SEGMENTS      SCSI_MAX_SG_SEGMENTS
  32 #endif
  33
  34 /*
  35  * DIX-capable adapters effectively support infinite chaining for the
  36  * protection information scatterlist
  37  */
  38 #define SCSI_MAX_PROT_SG_SEGMENTS       0xFFFF
  39
  40 /*
  41  * Special value for scanning to specify scanning or rescanning of all
  42  * possible channels, (target) ids, or luns on a given shost.
  43  */
  44 #define SCAN_WILD_CARD  ~0
  45
  46 /*
  47  *      SCSI opcodes
  48  */
  49
  50 #define TEST_UNIT_READY       0x00
  51 #define REZERO_UNIT           0x01
  52 #define REQUEST_SENSE         0x03
  53 #define FORMAT_UNIT           0x04
  54 #define READ_BLOCK_LIMITS     0x05
  55 #define REASSIGN_BLOCKS       0x07
  56 #define INITIALIZE_ELEMENT_STATUS 0x07
  57 #define READ_6                0x08
  58 #define WRITE_6               0x0a
  59 #define SEEK_6                0x0b
  60 #define READ_REVERSE          0x0f
  61 #define WRITE_FILEMARKS       0x10
  62 #define SPACE                 0x11
  63 #define INQUIRY               0x12
  64 #define RECOVER_BUFFERED_DATA 0x14
  65 #define MODE_SELECT           0x15
  66 #define RESERVE               0x16
  67 #define RELEASE               0x17
  68 #define COPY                  0x18
  69 #define ERASE                 0x19
  70 #define MODE_SENSE            0x1a
  71 #define START_STOP            0x1b
  72 #define RECEIVE_DIAGNOSTIC    0x1c
  73 #define SEND_DIAGNOSTIC       0x1d
  74 #define ALLOW_MEDIUM_REMOVAL  0x1e
  75
  76 #define READ_FORMAT_CAPACITIES 0x23
  77 #define SET_WINDOW            0x24
  78 #define READ_CAPACITY         0x25
  79 #define READ_10               0x28
  80 #define WRITE_10              0x2a
  81 #define SEEK_10               0x2b
  82 #define POSITION_TO_ELEMENT   0x2b
  83 #define WRITE_VERIFY          0x2e
  84 #define VERIFY                0x2f
  85 #define SEARCH_HIGH           0x30
  86 #define SEARCH_EQUAL          0x31
  87 #define SEARCH_LOW            0x32
  88 #define SET_LIMITS            0x33
  89 #define PRE_FETCH             0x34
  90 #define READ_POSITION         0x34
  91 #define SYNCHRONIZE_CACHE     0x35
  92 #define LOCK_UNLOCK_CACHE     0x36
  93 #define READ_DEFECT_DATA      0x37
  94 #define MEDIUM_SCAN           0x38
  95 #define COMPARE               0x39
  96 #define COPY_VERIFY           0x3a
  97 #define WRITE_BUFFER          0x3b
  98 #define READ_BUFFER           0x3c
  99 #define UPDATE_BLOCK          0x3d
 100 #define READ_LONG             0x3e
 101 #define WRITE_LONG            0x3f
 102 #define CHANGE_DEFINITION     0x40
 103 #define WRITE_SAME            0x41
 104 #define UNMAP                 0x42
 105 #define READ_TOC              0x43
 106 #define READ_HEADER           0x44
 107 #define LOG_SELECT            0x4c
 108 #define LOG_SENSE             0x4d
 109 #define XDWRITEREAD_10        0x53
 110 #define MODE_SELECT_10        0x55
 111 #define RESERVE_10            0x56
 112 #define RELEASE_10            0x57
 113 #define MODE_SENSE_10         0x5a
 114 #define PERSISTENT_RESERVE_IN 0x5e
 115 #define PERSISTENT_RESERVE_OUT 0x5f
 116 #define VARIABLE_LENGTH_CMD   0x7f
 117 #define REPORT_LUNS           0xa0
 118 #define SECURITY_PROTOCOL_IN  0xa2
 119 #define MAINTENANCE_IN        0xa3
 120 #define MAINTENANCE_OUT       0xa4
 121 #define MOVE_MEDIUM           0xa5
 122 #define EXCHANGE_MEDIUM       0xa6
 123 #define READ_12               0xa8
 124 #define WRITE_12              0xaa
 125 #define READ_MEDIA_SERIAL_NUMBER 0xab
 126 #define WRITE_VERIFY_12       0xae
 127 #define VERIFY_12             0xaf
 128 #define SEARCH_HIGH_12        0xb0
 129 #define SEARCH_EQUAL_12       0xb1
 130 #define SEARCH_LOW_12         0xb2
 131 #define SECURITY_PROTOCOL_OUT 0xb5
 132 #define READ_ELEMENT_STATUS   0xb8
 133 #define SEND_VOLUME_TAG       0xb6
 134 #define WRITE_LONG_2          0xea
 135 #define EXTENDED_COPY         0x83
 136 #define RECEIVE_COPY_RESULTS  0x84
 137 #define ACCESS_CONTROL_IN     0x86
 138 #define ACCESS_CONTROL_OUT    0x87
 139 #define READ_16               0x88
 140 #define WRITE_16              0x8a
 141 #define READ_ATTRIBUTE        0x8c
 142 #define WRITE_ATTRIBUTE       0x8d
 143 #define VERIFY_16             0x8f
 144 #define WRITE_SAME_16         0x93
 145 #define SERVICE_ACTION_IN     0x9e
 146 /* values for service action in */
 147 #define SAI_READ_CAPACITY_16  0x10
 148 #define SAI_GET_LBA_STATUS    0x12
 149 /* values for VARIABLE_LENGTH_CMD service action codes
 150  * see spc4r17 Section D.3.5, table D.7 and D.8 */
 151 #define VLC_SA_RECEIVE_CREDENTIAL 0x1800
 152 /* values for maintenance in */
 153 #define MI_REPORT_IDENTIFYING_INFORMATION 0x05
 154 #define MI_REPORT_TARGET_PGS  0x0a
 155 #define MI_REPORT_ALIASES     0x0b
 156 #define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
 157 #define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
 158 #define MI_REPORT_PRIORITY   0x0e
 159 #define MI_REPORT_TIMESTAMP  0x0f
 160 #define MI_MANAGEMENT_PROTOCOL_IN 0x10
 161 /* values for maintenance out */
 162 #define MO_SET_IDENTIFYING_INFORMATION 0x06
 163 #define MO_SET_TARGET_PGS     0x0a
 164 #define MO_CHANGE_ALIASES     0x0b
 165 #define MO_SET_PRIORITY       0x0e
 166 #define MO_SET_TIMESTAMP      0x0f
 167 #define MO_MANAGEMENT_PROTOCOL_OUT 0x10
 168 /* values for variable length command */
 169 #define XDREAD_32             0x03
 170 #define XDWRITE_32            0x04
 171 #define XPWRITE_32            0x06
 172 #define XDWRITEREAD_32        0x07
 173 #define READ_32               0x09
 174 #define VERIFY_32             0x0a
 175 #define WRITE_32              0x0b
 176 #define WRITE_SAME_32         0x0d
 177
 178 /* Values for T10/04-262r7 */
 179 #define ATA_16                0x85      /* 16-byte pass-thru */
 180 #define ATA_12                0xa1      /* 12-byte pass-thru */
 181
 182 /*
 183  *      SCSI command lengths
 184  */
 185
 186 #define SCSI_MAX_VARLEN_CDB_SIZE 260
 187
 188 /* defined in T10 SCSI Primary Commands-2 (SPC2) */
 189 struct scsi_varlen_cdb_hdr {
 190         __u8 opcode;        /* opcode always == VARIABLE_LENGTH_CMD */
 191         __u8 control;
 192         __u8 misc[5];
 193         __u8 additional_cdb_length;         /* total cdb length - 8 */
 194         __be16 service_action;
 195         /* service specific data follows */
 196 };
 197
 198 static inline unsigned
 199 scsi_varlen_cdb_length(const void *hdr)
 200 {
 201         return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
 202 }
 203
 204 extern const unsigned char scsi_command_size_tbl[8];
 205 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
 206
 207 static inline unsigned
 208 scsi_command_size(const unsigned char *cmnd)
 209 {
 210         return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
 211                 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
 212 }
 213
 214 /*
 215  *  SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
 216  *  T10/1561-D Revision 4 Draft dated 7th November 2002.
 217  */
 218 #define SAM_STAT_GOOD            0x00
 219 #define SAM_STAT_CHECK_CONDITION 0x02
 220 #define SAM_STAT_CONDITION_MET   0x04
 221 #define SAM_STAT_BUSY            0x08
 222 #define SAM_STAT_INTERMEDIATE    0x10
 223 #define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
 224 #define SAM_STAT_RESERVATION_CONFLICT 0x18
 225 #define SAM_STAT_COMMAND_TERMINATED 0x22        /* obsolete in SAM-3 */
 226 #define SAM_STAT_TASK_SET_FULL   0x28
 227 #define SAM_STAT_ACA_ACTIVE      0x30
 228 #define SAM_STAT_TASK_ABORTED    0x40
 229
 230 /** scsi_status_is_good - check the status return.
 231  *
 232  * @status: the status passed up from the driver (including host and
 233  *          driver components)
 234  *
 235  * This returns true for known good conditions that may be treated as
 236  * command completed normally
 237  */
 238 static inline int scsi_status_is_good(int status)
 239 {
 240         /*
 241          * FIXME: bit0 is listed as reserved in SCSI-2, but is
 242          * significant in SCSI-3.  For now, we follow the SCSI-2
 243          * behaviour and ignore reserved bits.
 244          */
 245         status &= 0xfe;
 246         return ((status == SAM_STAT_GOOD) ||
 247                 (status == SAM_STAT_INTERMEDIATE) ||
 248                 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
 249                 /* FIXME: this is obsolete in SAM-3 */
 250                 (status == SAM_STAT_COMMAND_TERMINATED));
 251 }
 252
 253 /*
 254  *  Status codes. These are deprecated as they are shifted 1 bit right
 255  *  from those found in the SCSI standards. This causes confusion for
 256  *  applications that are ported to several OSes. Prefer SAM Status codes
 257  *  above.
 258  */
 259
 260 #define GOOD                 0x00
 261 #define CHECK_CONDITION      0x01
 262 #define CONDITION_GOOD       0x02
 263 #define BUSY                 0x04
 264 #define INTERMEDIATE_GOOD    0x08
 265 #define INTERMEDIATE_C_GOOD  0x0a
 266 #define RESERVATION_CONFLICT 0x0c
 267 #define COMMAND_TERMINATED   0x11
 268 #define QUEUE_FULL           0x14
 269 #define ACA_ACTIVE           0x18
 270 #define TASK_ABORTED         0x20
 271
 272 #define STATUS_MASK          0xfe
 273
 274 /*
 275  *  SENSE KEYS
 276  */
 277
 278 #define NO_SENSE            0x00
 279 #define RECOVERED_ERROR     0x01
 280 #define NOT_READY           0x02
 281 #define MEDIUM_ERROR        0x03
 282 #define HARDWARE_ERROR      0x04
 283 #define ILLEGAL_REQUEST     0x05
 284 #define UNIT_ATTENTION      0x06
 285 #define DATA_PROTECT        0x07
 286 #define BLANK_CHECK         0x08
 287 #define COPY_ABORTED        0x0a
 288 #define ABORTED_COMMAND     0x0b
 289 #define VOLUME_OVERFLOW     0x0d
 290 #define MISCOMPARE          0x0e
 291
 292
 293 /*
 294  *  DEVICE TYPES
 295  *  Please keep them in 0x%02x format for $MODALIAS to work
 296  */
 297
 298 #define TYPE_DISK           0x00
 299 #define TYPE_TAPE           0x01
 300 #define TYPE_PRINTER        0x02
 301 #define TYPE_PROCESSOR      0x03    /* HP scanners use this */
 302 #define TYPE_WORM           0x04    /* Treated as ROM by our system */
 303 #define TYPE_ROM            0x05
 304 #define TYPE_SCANNER        0x06
 305 #define TYPE_MOD            0x07    /* Magneto-optical disk -
 306                                      * - treated as TYPE_DISK */
 307 #define TYPE_MEDIUM_CHANGER 0x08
 308 #define TYPE_COMM           0x09    /* Communications device */
 309 #define TYPE_RAID           0x0c
 310 #define TYPE_ENCLOSURE      0x0d    /* Enclosure Services Device */
 311 #define TYPE_RBC            0x0e
 312 #define TYPE_OSD            0x11
 313 #define TYPE_NO_LUN         0x7f
 314
 315 /* SCSI protocols; these are taken from SPC-3 section 7.5 */
 316 enum scsi_protocol {
 317         SCSI_PROTOCOL_FCP = 0,  /* Fibre Channel */
 318         SCSI_PROTOCOL_SPI = 1,  /* parallel SCSI */
 319         SCSI_PROTOCOL_SSA = 2,  /* Serial Storage Architecture - Obsolete */
 320         SCSI_PROTOCOL_SBP = 3,  /* firewire */
 321         SCSI_PROTOCOL_SRP = 4,  /* Infiniband RDMA */
 322         SCSI_PROTOCOL_ISCSI = 5,
 323         SCSI_PROTOCOL_SAS = 6,
 324         SCSI_PROTOCOL_ADT = 7,  /* Media Changers */
 325         SCSI_PROTOCOL_ATA = 8,
 326         SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
 327 };
 328
 329 /* Returns a human-readable name for the device */
 330 extern const char * scsi_device_type(unsigned type);
 331
 332 /*
 333  * standard mode-select header prepended to all mode-select commands
 334  */
 335
 336 struct ccs_modesel_head {
 337         __u8 _r1;                       /* reserved */
 338         __u8 medium;            /* device-specific medium type */
 339         __u8 _r2;                       /* reserved */
 340         __u8 block_desc_length; /* block descriptor length */
 341         __u8 density;           /* device-specific density code */
 342         __u8 number_blocks_hi;  /* number of blocks in this block desc */
 343         __u8 number_blocks_med;
 344         __u8 number_blocks_lo;
 345         __u8 _r3;
 346         __u8 block_length_hi;   /* block length for blocks in this desc */
 347         __u8 block_length_med;
 348         __u8 block_length_lo;
 349 };
 350
 351 /*
 352  * ScsiLun: 8 byte LUN.
 353  */
 354 struct scsi_lun {
 355         __u8 scsi_lun[8];
 356 };
 357
 358 /*
 359  * The Well Known LUNS (SAM-3) in our int representation of a LUN
 360  */
 361 #define SCSI_W_LUN_BASE 0xc100
 362 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
 363 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
 364 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
 365
 366 static inline int scsi_is_wlun(unsigned int lun)
 367 {
 368         return (lun & 0xff00) == SCSI_W_LUN_BASE;
 369 }
 370
 371
 372 /*
 373  *  MESSAGE CODES
 374  */
 375
 376 #define COMMAND_COMPLETE    0x00
 377 #define EXTENDED_MESSAGE    0x01
 378 #define     EXTENDED_MODIFY_DATA_POINTER    0x00
 379 #define     EXTENDED_SDTR                   0x01
 380 #define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
 381 #define     EXTENDED_WDTR                   0x03
 382 #define     EXTENDED_PPR                    0x04
 383 #define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05
 384 #define SAVE_POINTERS       0x02
 385 #define RESTORE_POINTERS    0x03
 386 #define DISCONNECT          0x04
 387 #define INITIATOR_ERROR     0x05
 388 #define ABORT_TASK_SET      0x06
 389 #define MESSAGE_REJECT      0x07
 390 #define NOP                 0x08
 391 #define MSG_PARITY_ERROR    0x09
 392 #define LINKED_CMD_COMPLETE 0x0a
 393 #define LINKED_FLG_CMD_COMPLETE 0x0b
 394 #define TARGET_RESET        0x0c
 395 #define ABORT_TASK          0x0d
 396 #define CLEAR_TASK_SET      0x0e
 397 #define INITIATE_RECOVERY   0x0f            /* SCSI-II only */
 398 #define RELEASE_RECOVERY    0x10            /* SCSI-II only */
 399 #define CLEAR_ACA           0x16
 400 #define LOGICAL_UNIT_RESET  0x17
 401 #define SIMPLE_QUEUE_TAG    0x20
 402 #define HEAD_OF_QUEUE_TAG   0x21
 403 #define ORDERED_QUEUE_TAG   0x22
 404 #define IGNORE_WIDE_RESIDUE 0x23
 405 #define ACA                 0x24
 406 #define QAS_REQUEST         0x55
 407
 408 /* Old SCSI2 names, don't use in new code */
 409 #define BUS_DEVICE_RESET    TARGET_RESET
 410 #define ABORT               ABORT_TASK_SET
 411
 412 /*
 413  * Host byte codes
 414  */
 415
 416 #define DID_OK          0x00    /* NO error                                */
 417 #define DID_NO_CONNECT  0x01    /* Couldn't connect before timeout period  */
 418 #define DID_BUS_BUSY    0x02    /* BUS stayed busy through time out period */
 419 #define DID_TIME_OUT    0x03    /* TIMED OUT for other reason              */
 420 #define DID_BAD_TARGET  0x04    /* BAD target.                             */
 421 #define DID_ABORT       0x05    /* Told to abort for some other reason     */
 422 #define DID_PARITY      0x06    /* Parity error                            */
 423 #define DID_ERROR       0x07    /* Internal error                          */
 424 #define DID_RESET       0x08    /* Reset by somebody.                      */
 425 #define DID_BAD_INTR    0x09    /* Got an interrupt we weren't expecting.  */
 426 #define DID_PASSTHROUGH 0x0a    /* Force command past mid-layer            */
 427 #define DID_SOFT_ERROR  0x0b    /* The low level driver just wish a retry  */
 428 #define DID_IMM_RETRY   0x0c    /* Retry without decrementing retry count  */
 429 #define DID_REQUEUE     0x0d    /* Requeue command (no immediate retry) also
 430                                  * without decrementing the retry count    */
 431 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
 432                                       * and the driver blocked the port to
 433                                       * recover the link. Transport class will
 434                                       * retry or fail IO */
 435 #define DID_TRANSPORT_FAILFAST  0x0f /* Transport class fastfailed the io */
 436 #define DRIVER_OK       0x00    /* Driver status                           */
 437
 438 /*
 439  *  These indicate the error that occurred, and what is available.
 440  */
 441
 442 #define DRIVER_BUSY         0x01
 443 #define DRIVER_SOFT         0x02
 444 #define DRIVER_MEDIA        0x03
 445 #define DRIVER_ERROR        0x04
 446
 447 #define DRIVER_INVALID      0x05
 448 #define DRIVER_TIMEOUT      0x06
 449 #define DRIVER_HARD         0x07
 450 #define DRIVER_SENSE        0x08
 451
 452 /*
 453  * Internal return values.
 454  */
 455
 456 #define NEEDS_RETRY     0x2001
 457 #define SUCCESS         0x2002
 458 #define FAILED          0x2003
 459 #define QUEUED          0x2004
 460 #define SOFT_ERROR      0x2005
 461 #define ADD_TO_MLQUEUE  0x2006
 462 #define TIMEOUT_ERROR   0x2007
 463 #define SCSI_RETURN_NOT_HANDLED   0x2008
 464 #define FAST_IO_FAIL    0x2009
 465
 466 /*
 467  * Midlevel queue return values.
 468  */
 469 #define SCSI_MLQUEUE_HOST_BUSY   0x1055
 470 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
 471 #define SCSI_MLQUEUE_EH_RETRY    0x1057
 472 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
 473
 474 /*
 475  *  Use these to separate status msg and our bytes
 476  *
 477  *  These are set by:
 478  *
 479  *      status byte = set from target device
 480  *      msg_byte    = return status from host adapter itself.
 481  *      host_byte   = set by low-level driver to indicate status.
 482  *      driver_byte = set by mid-level.
 483  */
 484 #define status_byte(result) (((result) >> 1) & 0x7f)
 485 #define msg_byte(result)    (((result) >> 8) & 0xff)
 486 #define host_byte(result)   (((result) >> 16) & 0xff)
 487 #define driver_byte(result) (((result) >> 24) & 0xff)
 488
 489 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 490 #define sense_error(sense)  ((sense) & 0xf)
 491 #define sense_valid(sense)  ((sense) & 0x80);
 492
 493 /*
 494  * default timeouts
 495 */
 496 #define FORMAT_UNIT_TIMEOUT             (2 * 60 * 60 * HZ)
 497 #define START_STOP_TIMEOUT              (60 * HZ)
 498 #define MOVE_MEDIUM_TIMEOUT             (5 * 60 * HZ)
 499 #define READ_ELEMENT_STATUS_TIMEOUT     (5 * 60 * HZ)
 500 #define READ_DEFECT_DATA_TIMEOUT        (60 * HZ )
 501
 502
 503 #define IDENTIFY_BASE       0x80
 504 #define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
 505                      ((can_disconnect) ?  0x40 : 0) |\
 506                      ((lun) & 0x07))
 507
 508 /*
 509  *  struct scsi_device::scsi_level values. For SCSI devices other than those
 510  *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 511  *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 512  *  variable is visible to the user via sysfs.
 513  */
 514
 515 #define SCSI_UNKNOWN    0
 516 #define SCSI_1          1
 517 #define SCSI_1_CCS      2
 518 #define SCSI_2          3
 519 #define SCSI_3          4        /* SPC */
 520 #define SCSI_SPC_2      5
 521 #define SCSI_SPC_3      6
 522
 523 /*
 524  * INQ PERIPHERAL QUALIFIERS
 525  */
 526 #define SCSI_INQ_PQ_CON         0x00
 527 #define SCSI_INQ_PQ_NOT_CON     0x01
 528 #define SCSI_INQ_PQ_NOT_CAP     0x03
 529
 530
 531 /*
 532  * Here are some scsi specific ioctl commands which are sometimes useful.
 533  *
 534  * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 535  */
 536
 537 /* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
 538 #define SCSI_IOCTL_GET_IDLUN            0x5382
 539
 540 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
 541
 542 /* Used to obtain the host number of a device. */
 543 #define SCSI_IOCTL_PROBE_HOST           0x5385
 544
 545 /* Used to obtain the bus number for a device */
 546 #define SCSI_IOCTL_GET_BUS_NUMBER       0x5386
 547
 548 /* Used to obtain the PCI location of a device */
 549 #define SCSI_IOCTL_GET_PCI              0x5387
 550
 551 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
 552 static inline __u32 scsi_to_u32(__u8 *ptr)
 553 {
 554         return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
 555 }
 556
 557 #endif /* _SCSI_SCSI_H */