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 #include <linux/scatterlist.h>
  13
  14 struct scsi_cmnd;
  15
  16 /*
  17  * The maximum number of SG segments that we will put inside a
  18  * scatterlist (unless chaining is used). Should ideally fit inside a
  19  * single page, to avoid a higher order allocation.  We could define this
  20  * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order.  The
  21  * minimum value is 32
  22  */
  23 #define SCSI_MAX_SG_SEGMENTS    128
  24
  25 /*
  26  * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
  27  * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
  28  */
  29 #ifdef ARCH_HAS_SG_CHAIN
  30 #define SCSI_MAX_SG_CHAIN_SEGMENTS      2048
  31 #else
  32 #define SCSI_MAX_SG_CHAIN_SEGMENTS      SCSI_MAX_SG_SEGMENTS
  33 #endif
  34
  35 /*
  36  * DIX-capable adapters effectively support infinite chaining for the
  37  * protection information scatterlist
  38  */
  39 #define SCSI_MAX_PROT_SG_SEGMENTS       0xFFFF
  40
  41 /*
  42  * Special value for scanning to specify scanning or rescanning of all
  43  * possible channels, (target) ids, or luns on a given shost.
  44  */
  45 #define SCAN_WILD_CARD  ~0
  46
  47 /*
  48  *      SCSI opcodes
  49  */
  50
  51 #define TEST_UNIT_READY       0x00
  52 #define REZERO_UNIT           0x01
  53 #define REQUEST_SENSE         0x03
  54 #define FORMAT_UNIT           0x04
  55 #define READ_BLOCK_LIMITS     0x05
  56 #define REASSIGN_BLOCKS       0x07
  57 #define INITIALIZE_ELEMENT_STATUS 0x07
  58 #define READ_6                0x08
  59 #define WRITE_6               0x0a
  60 #define SEEK_6                0x0b
  61 #define READ_REVERSE          0x0f
  62 #define WRITE_FILEMARKS       0x10
  63 #define SPACE                 0x11
  64 #define INQUIRY               0x12
  65 #define RECOVER_BUFFERED_DATA 0x14
  66 #define MODE_SELECT           0x15
  67 #define RESERVE               0x16
  68 #define RELEASE               0x17
  69 #define COPY                  0x18
  70 #define ERASE                 0x19
  71 #define MODE_SENSE            0x1a
  72 #define START_STOP            0x1b
  73 #define RECEIVE_DIAGNOSTIC    0x1c
  74 #define SEND_DIAGNOSTIC       0x1d
  75 #define ALLOW_MEDIUM_REMOVAL  0x1e
  76
  77 #define READ_FORMAT_CAPACITIES 0x23
  78 #define SET_WINDOW            0x24
  79 #define READ_CAPACITY         0x25
  80 #define READ_10               0x28
  81 #define WRITE_10              0x2a
  82 #define SEEK_10               0x2b
  83 #define POSITION_TO_ELEMENT   0x2b
  84 #define WRITE_VERIFY          0x2e
  85 #define VERIFY                0x2f
  86 #define SEARCH_HIGH           0x30
  87 #define SEARCH_EQUAL          0x31
  88 #define SEARCH_LOW            0x32
  89 #define SET_LIMITS            0x33
  90 #define PRE_FETCH             0x34
  91 #define READ_POSITION         0x34
  92 #define SYNCHRONIZE_CACHE     0x35
  93 #define LOCK_UNLOCK_CACHE     0x36
  94 #define READ_DEFECT_DATA      0x37
  95 #define MEDIUM_SCAN           0x38
  96 #define COMPARE               0x39
  97 #define COPY_VERIFY           0x3a
  98 #define WRITE_BUFFER          0x3b
  99 #define READ_BUFFER           0x3c
 100 #define UPDATE_BLOCK          0x3d
 101 #define READ_LONG             0x3e
 102 #define WRITE_LONG            0x3f
 103 #define CHANGE_DEFINITION     0x40
 104 #define WRITE_SAME            0x41
 105 #define UNMAP                 0x42
 106 #define READ_TOC              0x43
 107 #define READ_HEADER           0x44
 108 #define GET_EVENT_STATUS_NOTIFICATION 0x4a
 109 #define LOG_SELECT            0x4c
 110 #define LOG_SENSE             0x4d
 111 #define XDWRITEREAD_10        0x53
 112 #define MODE_SELECT_10        0x55
 113 #define RESERVE_10            0x56
 114 #define RELEASE_10            0x57
 115 #define MODE_SENSE_10         0x5a
 116 #define PERSISTENT_RESERVE_IN 0x5e
 117 #define PERSISTENT_RESERVE_OUT 0x5f
 118 #define VARIABLE_LENGTH_CMD   0x7f
 119 #define REPORT_LUNS           0xa0
 120 #define SECURITY_PROTOCOL_IN  0xa2
 121 #define MAINTENANCE_IN        0xa3
 122 #define MAINTENANCE_OUT       0xa4
 123 #define MOVE_MEDIUM           0xa5
 124 #define EXCHANGE_MEDIUM       0xa6
 125 #define READ_12               0xa8
 126 #define WRITE_12              0xaa
 127 #define READ_MEDIA_SERIAL_NUMBER 0xab
 128 #define WRITE_VERIFY_12       0xae
 129 #define VERIFY_12             0xaf
 130 #define SEARCH_HIGH_12        0xb0
 131 #define SEARCH_EQUAL_12       0xb1
 132 #define SEARCH_LOW_12         0xb2
 133 #define SECURITY_PROTOCOL_OUT 0xb5
 134 #define READ_ELEMENT_STATUS   0xb8
 135 #define SEND_VOLUME_TAG       0xb6
 136 #define WRITE_LONG_2          0xea
 137 #define EXTENDED_COPY         0x83
 138 #define RECEIVE_COPY_RESULTS  0x84
 139 #define ACCESS_CONTROL_IN     0x86
 140 #define ACCESS_CONTROL_OUT    0x87
 141 #define READ_16               0x88
 142 #define WRITE_16              0x8a
 143 #define READ_ATTRIBUTE        0x8c
 144 #define WRITE_ATTRIBUTE       0x8d
 145 #define VERIFY_16             0x8f
 146 #define SYNCHRONIZE_CACHE_16  0x91
 147 #define WRITE_SAME_16         0x93
 148 #define SERVICE_ACTION_IN     0x9e
 149 /* values for service action in */
 150 #define SAI_READ_CAPACITY_16  0x10
 151 #define SAI_GET_LBA_STATUS    0x12
 152 /* values for VARIABLE_LENGTH_CMD service action codes
 153  * see spc4r17 Section D.3.5, table D.7 and D.8 */
 154 #define VLC_SA_RECEIVE_CREDENTIAL 0x1800
 155 /* values for maintenance in */
 156 #define MI_REPORT_IDENTIFYING_INFORMATION 0x05
 157 #define MI_REPORT_TARGET_PGS  0x0a
 158 #define MI_REPORT_ALIASES     0x0b
 159 #define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
 160 #define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
 161 #define MI_REPORT_PRIORITY   0x0e
 162 #define MI_REPORT_TIMESTAMP  0x0f
 163 #define MI_MANAGEMENT_PROTOCOL_IN 0x10
 164 /* value for MI_REPORT_TARGET_PGS ext header */
 165 #define MI_EXT_HDR_PARAM_FMT  0x20
 166 /* values for maintenance out */
 167 #define MO_SET_IDENTIFYING_INFORMATION 0x06
 168 #define MO_SET_TARGET_PGS     0x0a
 169 #define MO_CHANGE_ALIASES     0x0b
 170 #define MO_SET_PRIORITY       0x0e
 171 #define MO_SET_TIMESTAMP      0x0f
 172 #define MO_MANAGEMENT_PROTOCOL_OUT 0x10
 173 /* values for variable length command */
 174 #define XDREAD_32             0x03
 175 #define XDWRITE_32            0x04
 176 #define XPWRITE_32            0x06
 177 #define XDWRITEREAD_32        0x07
 178 #define READ_32               0x09
 179 #define VERIFY_32             0x0a
 180 #define WRITE_32              0x0b
 181 #define WRITE_SAME_32         0x0d
 182
 183 /* Values for T10/04-262r7 */
 184 #define ATA_16                0x85      /* 16-byte pass-thru */
 185 #define ATA_12                0xa1      /* 12-byte pass-thru */
 186
 187 /*
 188  *      SCSI command lengths
 189  */
 190
 191 #define SCSI_MAX_VARLEN_CDB_SIZE 260
 192
 193 /* defined in T10 SCSI Primary Commands-2 (SPC2) */
 194 struct scsi_varlen_cdb_hdr {
 195         __u8 opcode;        /* opcode always == VARIABLE_LENGTH_CMD */
 196         __u8 control;
 197         __u8 misc[5];
 198         __u8 additional_cdb_length;         /* total cdb length - 8 */
 199         __be16 service_action;
 200         /* service specific data follows */
 201 };
 202
 203 static inline unsigned
 204 scsi_varlen_cdb_length(const void *hdr)
 205 {
 206         return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
 207 }
 208
 209 extern const unsigned char scsi_command_size_tbl[8];
 210 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
 211
 212 static inline unsigned
 213 scsi_command_size(const unsigned char *cmnd)
 214 {
 215         return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
 216                 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
 217 }
 218
 219 #ifdef CONFIG_ACPI
 220 struct acpi_bus_type;
 221
 222 extern int
 223 scsi_register_acpi_bus_type(struct acpi_bus_type *bus);
 224
 225 extern void
 226 scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
 227 #endif
 228
 229 /*
 230  *  SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
 231  *  T10/1561-D Revision 4 Draft dated 7th November 2002.
 232  */
 233 #define SAM_STAT_GOOD            0x00
 234 #define SAM_STAT_CHECK_CONDITION 0x02
 235 #define SAM_STAT_CONDITION_MET   0x04
 236 #define SAM_STAT_BUSY            0x08
 237 #define SAM_STAT_INTERMEDIATE    0x10
 238 #define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
 239 #define SAM_STAT_RESERVATION_CONFLICT 0x18
 240 #define SAM_STAT_COMMAND_TERMINATED 0x22        /* obsolete in SAM-3 */
 241 #define SAM_STAT_TASK_SET_FULL   0x28
 242 #define SAM_STAT_ACA_ACTIVE      0x30
 243 #define SAM_STAT_TASK_ABORTED    0x40
 244
 245 /** scsi_status_is_good - check the status return.
 246  *
 247  * @status: the status passed up from the driver (including host and
 248  *          driver components)
 249  *
 250  * This returns true for known good conditions that may be treated as
 251  * command completed normally
 252  */
 253 static inline int scsi_status_is_good(int status)
 254 {
 255         /*
 256          * FIXME: bit0 is listed as reserved in SCSI-2, but is
 257          * significant in SCSI-3.  For now, we follow the SCSI-2
 258          * behaviour and ignore reserved bits.
 259          */
 260         status &= 0xfe;
 261         return ((status == SAM_STAT_GOOD) ||
 262                 (status == SAM_STAT_INTERMEDIATE) ||
 263                 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
 264                 /* FIXME: this is obsolete in SAM-3 */
 265                 (status == SAM_STAT_COMMAND_TERMINATED));
 266 }
 267
 268 /*
 269  *  Status codes. These are deprecated as they are shifted 1 bit right
 270  *  from those found in the SCSI standards. This causes confusion for
 271  *  applications that are ported to several OSes. Prefer SAM Status codes
 272  *  above.
 273  */
 274
 275 #define GOOD                 0x00
 276 #define CHECK_CONDITION      0x01
 277 #define CONDITION_GOOD       0x02
 278 #define BUSY                 0x04
 279 #define INTERMEDIATE_GOOD    0x08
 280 #define INTERMEDIATE_C_GOOD  0x0a
 281 #define RESERVATION_CONFLICT 0x0c
 282 #define COMMAND_TERMINATED   0x11
 283 #define QUEUE_FULL           0x14
 284 #define ACA_ACTIVE           0x18
 285 #define TASK_ABORTED         0x20
 286
 287 #define STATUS_MASK          0xfe
 288
 289 /*
 290  *  SENSE KEYS
 291  */
 292
 293 #define NO_SENSE            0x00
 294 #define RECOVERED_ERROR     0x01
 295 #define NOT_READY           0x02
 296 #define MEDIUM_ERROR        0x03
 297 #define HARDWARE_ERROR      0x04
 298 #define ILLEGAL_REQUEST     0x05
 299 #define UNIT_ATTENTION      0x06
 300 #define DATA_PROTECT        0x07
 301 #define BLANK_CHECK         0x08
 302 #define COPY_ABORTED        0x0a
 303 #define ABORTED_COMMAND     0x0b
 304 #define VOLUME_OVERFLOW     0x0d
 305 #define MISCOMPARE          0x0e
 306
 307
 308 /*
 309  *  DEVICE TYPES
 310  *  Please keep them in 0x%02x format for $MODALIAS to work
 311  */
 312
 313 #define TYPE_DISK           0x00
 314 #define TYPE_TAPE           0x01
 315 #define TYPE_PRINTER        0x02
 316 #define TYPE_PROCESSOR      0x03    /* HP scanners use this */
 317 #define TYPE_WORM           0x04    /* Treated as ROM by our system */
 318 #define TYPE_ROM            0x05
 319 #define TYPE_SCANNER        0x06
 320 #define TYPE_MOD            0x07    /* Magneto-optical disk -
 321                                      * - treated as TYPE_DISK */
 322 #define TYPE_MEDIUM_CHANGER 0x08
 323 #define TYPE_COMM           0x09    /* Communications device */
 324 #define TYPE_RAID           0x0c
 325 #define TYPE_ENCLOSURE      0x0d    /* Enclosure Services Device */
 326 #define TYPE_RBC            0x0e
 327 #define TYPE_OSD            0x11
 328 #define TYPE_NO_LUN         0x7f
 329
 330 /* SCSI protocols; these are taken from SPC-3 section 7.5 */
 331 enum scsi_protocol {
 332         SCSI_PROTOCOL_FCP = 0,  /* Fibre Channel */
 333         SCSI_PROTOCOL_SPI = 1,  /* parallel SCSI */
 334         SCSI_PROTOCOL_SSA = 2,  /* Serial Storage Architecture - Obsolete */
 335         SCSI_PROTOCOL_SBP = 3,  /* firewire */
 336         SCSI_PROTOCOL_SRP = 4,  /* Infiniband RDMA */
 337         SCSI_PROTOCOL_ISCSI = 5,
 338         SCSI_PROTOCOL_SAS = 6,
 339         SCSI_PROTOCOL_ADT = 7,  /* Media Changers */
 340         SCSI_PROTOCOL_ATA = 8,
 341         SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
 342 };
 343
 344 /* Returns a human-readable name for the device */
 345 extern const char * scsi_device_type(unsigned type);
 346
 347 /*
 348  * standard mode-select header prepended to all mode-select commands
 349  */
 350
 351 struct ccs_modesel_head {
 352         __u8 _r1;                       /* reserved */
 353         __u8 medium;            /* device-specific medium type */
 354         __u8 _r2;                       /* reserved */
 355         __u8 block_desc_length; /* block descriptor length */
 356         __u8 density;           /* device-specific density code */
 357         __u8 number_blocks_hi;  /* number of blocks in this block desc */
 358         __u8 number_blocks_med;
 359         __u8 number_blocks_lo;
 360         __u8 _r3;
 361         __u8 block_length_hi;   /* block length for blocks in this desc */
 362         __u8 block_length_med;
 363         __u8 block_length_lo;
 364 };
 365
 366 /*
 367  * ScsiLun: 8 byte LUN.
 368  */
 369 struct scsi_lun {
 370         __u8 scsi_lun[8];
 371 };
 372
 373 /*
 374  * The Well Known LUNS (SAM-3) in our int representation of a LUN
 375  */
 376 #define SCSI_W_LUN_BASE 0xc100
 377 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
 378 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
 379 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
 380
 381 static inline int scsi_is_wlun(unsigned int lun)
 382 {
 383         return (lun & 0xff00) == SCSI_W_LUN_BASE;
 384 }
 385
 386
 387 /*
 388  *  MESSAGE CODES
 389  */
 390
 391 #define COMMAND_COMPLETE    0x00
 392 #define EXTENDED_MESSAGE    0x01
 393 #define     EXTENDED_MODIFY_DATA_POINTER    0x00
 394 #define     EXTENDED_SDTR                   0x01
 395 #define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
 396 #define     EXTENDED_WDTR                   0x03
 397 #define     EXTENDED_PPR                    0x04
 398 #define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05
 399 #define SAVE_POINTERS       0x02
 400 #define RESTORE_POINTERS    0x03
 401 #define DISCONNECT          0x04
 402 #define INITIATOR_ERROR     0x05
 403 #define ABORT_TASK_SET      0x06
 404 #define MESSAGE_REJECT      0x07
 405 #define NOP                 0x08
 406 #define MSG_PARITY_ERROR    0x09
 407 #define LINKED_CMD_COMPLETE 0x0a
 408 #define LINKED_FLG_CMD_COMPLETE 0x0b
 409 #define TARGET_RESET        0x0c
 410 #define ABORT_TASK          0x0d
 411 #define CLEAR_TASK_SET      0x0e
 412 #define INITIATE_RECOVERY   0x0f            /* SCSI-II only */
 413 #define RELEASE_RECOVERY    0x10            /* SCSI-II only */
 414 #define CLEAR_ACA           0x16
 415 #define LOGICAL_UNIT_RESET  0x17
 416 #define SIMPLE_QUEUE_TAG    0x20
 417 #define HEAD_OF_QUEUE_TAG   0x21
 418 #define ORDERED_QUEUE_TAG   0x22
 419 #define IGNORE_WIDE_RESIDUE 0x23
 420 #define ACA                 0x24
 421 #define QAS_REQUEST         0x55
 422
 423 /* Old SCSI2 names, don't use in new code */
 424 #define BUS_DEVICE_RESET    TARGET_RESET
 425 #define ABORT               ABORT_TASK_SET
 426
 427 /*
 428  * Host byte codes
 429  */
 430
 431 #define DID_OK          0x00    /* NO error                                */
 432 #define DID_NO_CONNECT  0x01    /* Couldn't connect before timeout period  */
 433 #define DID_BUS_BUSY    0x02    /* BUS stayed busy through time out period */
 434 #define DID_TIME_OUT    0x03    /* TIMED OUT for other reason              */
 435 #define DID_BAD_TARGET  0x04    /* BAD target.                             */
 436 #define DID_ABORT       0x05    /* Told to abort for some other reason     */
 437 #define DID_PARITY      0x06    /* Parity error                            */
 438 #define DID_ERROR       0x07    /* Internal error                          */
 439 #define DID_RESET       0x08    /* Reset by somebody.                      */
 440 #define DID_BAD_INTR    0x09    /* Got an interrupt we weren't expecting.  */
 441 #define DID_PASSTHROUGH 0x0a    /* Force command past mid-layer            */
 442 #define DID_SOFT_ERROR  0x0b    /* The low level driver just wish a retry  */
 443 #define DID_IMM_RETRY   0x0c    /* Retry without decrementing retry count  */
 444 #define DID_REQUEUE     0x0d    /* Requeue command (no immediate retry) also
 445                                  * without decrementing the retry count    */
 446 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
 447                                       * and the driver blocked the port to
 448                                       * recover the link. Transport class will
 449                                       * retry or fail IO */
 450 #define DID_TRANSPORT_FAILFAST  0x0f /* Transport class fastfailed the io */
 451 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
 452                                  * other paths */
 453 #define DID_NEXUS_FAILURE 0x11  /* Permanent nexus failure, retry on other
 454                                  * paths might yield different results */
 455 #define DRIVER_OK       0x00    /* Driver status                           */
 456
 457 /*
 458  *  These indicate the error that occurred, and what is available.
 459  */
 460
 461 #define DRIVER_BUSY         0x01
 462 #define DRIVER_SOFT         0x02
 463 #define DRIVER_MEDIA        0x03
 464 #define DRIVER_ERROR        0x04
 465
 466 #define DRIVER_INVALID      0x05
 467 #define DRIVER_TIMEOUT      0x06
 468 #define DRIVER_HARD         0x07
 469 #define DRIVER_SENSE        0x08
 470
 471 /*
 472  * Internal return values.
 473  */
 474
 475 #define NEEDS_RETRY     0x2001
 476 #define SUCCESS         0x2002
 477 #define FAILED          0x2003
 478 #define QUEUED          0x2004
 479 #define SOFT_ERROR      0x2005
 480 #define ADD_TO_MLQUEUE  0x2006
 481 #define TIMEOUT_ERROR   0x2007
 482 #define SCSI_RETURN_NOT_HANDLED   0x2008
 483 #define FAST_IO_FAIL    0x2009
 484 #define TARGET_ERROR    0x200A
 485
 486 /*
 487  * Midlevel queue return values.
 488  */
 489 #define SCSI_MLQUEUE_HOST_BUSY   0x1055
 490 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
 491 #define SCSI_MLQUEUE_EH_RETRY    0x1057
 492 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
 493
 494 /*
 495  *  Use these to separate status msg and our bytes
 496  *
 497  *  These are set by:
 498  *
 499  *      status byte = set from target device
 500  *      msg_byte    = return status from host adapter itself.
 501  *      host_byte   = set by low-level driver to indicate status.
 502  *      driver_byte = set by mid-level.
 503  */
 504 #define status_byte(result) (((result) >> 1) & 0x7f)
 505 #define msg_byte(result)    (((result) >> 8) & 0xff)
 506 #define host_byte(result)   (((result) >> 16) & 0xff)
 507 #define driver_byte(result) (((result) >> 24) & 0xff)
 508
 509 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 510 #define sense_error(sense)  ((sense) & 0xf)
 511 #define sense_valid(sense)  ((sense) & 0x80)
 512
 513 /*
 514  * default timeouts
 515 */
 516 #define FORMAT_UNIT_TIMEOUT             (2 * 60 * 60 * HZ)
 517 #define START_STOP_TIMEOUT              (60 * HZ)
 518 #define MOVE_MEDIUM_TIMEOUT             (5 * 60 * HZ)
 519 #define READ_ELEMENT_STATUS_TIMEOUT     (5 * 60 * HZ)
 520 #define READ_DEFECT_DATA_TIMEOUT        (60 * HZ )
 521
 522
 523 #define IDENTIFY_BASE       0x80
 524 #define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
 525                      ((can_disconnect) ?  0x40 : 0) |\
 526                      ((lun) & 0x07))
 527
 528 /*
 529  *  struct scsi_device::scsi_level values. For SCSI devices other than those
 530  *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 531  *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 532  *  variable is visible to the user via sysfs.
 533  */
 534
 535 #define SCSI_UNKNOWN    0
 536 #define SCSI_1          1
 537 #define SCSI_1_CCS      2
 538 #define SCSI_2          3
 539 #define SCSI_3          4        /* SPC */
 540 #define SCSI_SPC_2      5
 541 #define SCSI_SPC_3      6
 542
 543 /*
 544  * INQ PERIPHERAL QUALIFIERS
 545  */
 546 #define SCSI_INQ_PQ_CON         0x00
 547 #define SCSI_INQ_PQ_NOT_CON     0x01
 548 #define SCSI_INQ_PQ_NOT_CAP     0x03
 549
 550
 551 /*
 552  * Here are some scsi specific ioctl commands which are sometimes useful.
 553  *
 554  * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 555  */
 556
 557 /* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
 558 #define SCSI_IOCTL_GET_IDLUN            0x5382
 559
 560 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
 561
 562 /* Used to obtain the host number of a device. */
 563 #define SCSI_IOCTL_PROBE_HOST           0x5385
 564
 565 /* Used to obtain the bus number for a device */
 566 #define SCSI_IOCTL_GET_BUS_NUMBER       0x5386
 567
 568 /* Used to obtain the PCI location of a device */
 569 #define SCSI_IOCTL_GET_PCI              0x5387
 570
 571 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
 572 static inline __u32 scsi_to_u32(__u8 *ptr)
 573 {
 574         return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
 575 }
 576
 577 #endif /* _SCSI_SCSI_H */