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 #include <linux/kernel.h>
  14
  15 struct scsi_cmnd;
  16
  17 enum scsi_timeouts {
  18         SCSI_DEFAULT_EH_TIMEOUT         = 10 * HZ,
  19 };
  20
  21 /*
  22  * The maximum number of SG segments that we will put inside a
  23  * scatterlist (unless chaining is used). Should ideally fit inside a
  24  * single page, to avoid a higher order allocation.  We could define this
  25  * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order.  The
  26  * minimum value is 32
  27  */
  28 #define SCSI_MAX_SG_SEGMENTS    128
  29
  30 /*
  31  * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
  32  * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
  33  */
  34 #ifdef ARCH_HAS_SG_CHAIN
  35 #define SCSI_MAX_SG_CHAIN_SEGMENTS      2048
  36 #else
  37 #define SCSI_MAX_SG_CHAIN_SEGMENTS      SCSI_MAX_SG_SEGMENTS
  38 #endif
  39
  40 /*
  41  * DIX-capable adapters effectively support infinite chaining for the
  42  * protection information scatterlist
  43  */
  44 #define SCSI_MAX_PROT_SG_SEGMENTS       0xFFFF
  45
  46 /*
  47  * Special value for scanning to specify scanning or rescanning of all
  48  * possible channels, (target) ids, or luns on a given shost.
  49  */
  50 #define SCAN_WILD_CARD  ~0
  51
  52 /*
  53  *      SCSI opcodes
  54  */
  55
  56 #define TEST_UNIT_READY       0x00
  57 #define REZERO_UNIT           0x01
  58 #define REQUEST_SENSE         0x03
  59 #define FORMAT_UNIT           0x04
  60 #define READ_BLOCK_LIMITS     0x05
  61 #define REASSIGN_BLOCKS       0x07
  62 #define INITIALIZE_ELEMENT_STATUS 0x07
  63 #define READ_6                0x08
  64 #define WRITE_6               0x0a
  65 #define SEEK_6                0x0b
  66 #define READ_REVERSE          0x0f
  67 #define WRITE_FILEMARKS       0x10
  68 #define SPACE                 0x11
  69 #define INQUIRY               0x12
  70 #define RECOVER_BUFFERED_DATA 0x14
  71 #define MODE_SELECT           0x15
  72 #define RESERVE               0x16
  73 #define RELEASE               0x17
  74 #define COPY                  0x18
  75 #define ERASE                 0x19
  76 #define MODE_SENSE            0x1a
  77 #define START_STOP            0x1b
  78 #define RECEIVE_DIAGNOSTIC    0x1c
  79 #define SEND_DIAGNOSTIC       0x1d
  80 #define ALLOW_MEDIUM_REMOVAL  0x1e
  81
  82 #define READ_FORMAT_CAPACITIES 0x23
  83 #define SET_WINDOW            0x24
  84 #define READ_CAPACITY         0x25
  85 #define READ_10               0x28
  86 #define WRITE_10              0x2a
  87 #define SEEK_10               0x2b
  88 #define POSITION_TO_ELEMENT   0x2b
  89 #define WRITE_VERIFY          0x2e
  90 #define VERIFY                0x2f
  91 #define SEARCH_HIGH           0x30
  92 #define SEARCH_EQUAL          0x31
  93 #define SEARCH_LOW            0x32
  94 #define SET_LIMITS            0x33
  95 #define PRE_FETCH             0x34
  96 #define READ_POSITION         0x34
  97 #define SYNCHRONIZE_CACHE     0x35
  98 #define LOCK_UNLOCK_CACHE     0x36
  99 #define READ_DEFECT_DATA      0x37
 100 #define MEDIUM_SCAN           0x38
 101 #define COMPARE               0x39
 102 #define COPY_VERIFY           0x3a
 103 #define WRITE_BUFFER          0x3b
 104 #define READ_BUFFER           0x3c
 105 #define UPDATE_BLOCK          0x3d
 106 #define READ_LONG             0x3e
 107 #define WRITE_LONG            0x3f
 108 #define CHANGE_DEFINITION     0x40
 109 #define WRITE_SAME            0x41
 110 #define UNMAP                 0x42
 111 #define READ_TOC              0x43
 112 #define READ_HEADER           0x44
 113 #define GET_EVENT_STATUS_NOTIFICATION 0x4a
 114 #define LOG_SELECT            0x4c
 115 #define LOG_SENSE             0x4d
 116 #define XDWRITEREAD_10        0x53
 117 #define MODE_SELECT_10        0x55
 118 #define RESERVE_10            0x56
 119 #define RELEASE_10            0x57
 120 #define MODE_SENSE_10         0x5a
 121 #define PERSISTENT_RESERVE_IN 0x5e
 122 #define PERSISTENT_RESERVE_OUT 0x5f
 123 #define VARIABLE_LENGTH_CMD   0x7f
 124 #define REPORT_LUNS           0xa0
 125 #define SECURITY_PROTOCOL_IN  0xa2
 126 #define MAINTENANCE_IN        0xa3
 127 #define MAINTENANCE_OUT       0xa4
 128 #define MOVE_MEDIUM           0xa5
 129 #define EXCHANGE_MEDIUM       0xa6
 130 #define READ_12               0xa8
 131 #define WRITE_12              0xaa
 132 #define READ_MEDIA_SERIAL_NUMBER 0xab
 133 #define WRITE_VERIFY_12       0xae
 134 #define VERIFY_12             0xaf
 135 #define SEARCH_HIGH_12        0xb0
 136 #define SEARCH_EQUAL_12       0xb1
 137 #define SEARCH_LOW_12         0xb2
 138 #define SECURITY_PROTOCOL_OUT 0xb5
 139 #define READ_ELEMENT_STATUS   0xb8
 140 #define SEND_VOLUME_TAG       0xb6
 141 #define WRITE_LONG_2          0xea
 142 #define EXTENDED_COPY         0x83
 143 #define RECEIVE_COPY_RESULTS  0x84
 144 #define ACCESS_CONTROL_IN     0x86
 145 #define ACCESS_CONTROL_OUT    0x87
 146 #define READ_16               0x88
 147 #define COMPARE_AND_WRITE     0x89
 148 #define WRITE_16              0x8a
 149 #define READ_ATTRIBUTE        0x8c
 150 #define WRITE_ATTRIBUTE       0x8d
 151 #define VERIFY_16             0x8f
 152 #define SYNCHRONIZE_CACHE_16  0x91
 153 #define WRITE_SAME_16         0x93
 154 #define SERVICE_ACTION_IN     0x9e
 155 /* values for service action in */
 156 #define SAI_READ_CAPACITY_16  0x10
 157 #define SAI_GET_LBA_STATUS    0x12
 158 #define SAI_REPORT_REFERRALS  0x13
 159 /* values for VARIABLE_LENGTH_CMD service action codes
 160  * see spc4r17 Section D.3.5, table D.7 and D.8 */
 161 #define VLC_SA_RECEIVE_CREDENTIAL 0x1800
 162 /* values for maintenance in */
 163 #define MI_REPORT_IDENTIFYING_INFORMATION 0x05
 164 #define MI_REPORT_TARGET_PGS  0x0a
 165 #define MI_REPORT_ALIASES     0x0b
 166 #define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
 167 #define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
 168 #define MI_REPORT_PRIORITY   0x0e
 169 #define MI_REPORT_TIMESTAMP  0x0f
 170 #define MI_MANAGEMENT_PROTOCOL_IN 0x10
 171 /* value for MI_REPORT_TARGET_PGS ext header */
 172 #define MI_EXT_HDR_PARAM_FMT  0x20
 173 /* values for maintenance out */
 174 #define MO_SET_IDENTIFYING_INFORMATION 0x06
 175 #define MO_SET_TARGET_PGS     0x0a
 176 #define MO_CHANGE_ALIASES     0x0b
 177 #define MO_SET_PRIORITY       0x0e
 178 #define MO_SET_TIMESTAMP      0x0f
 179 #define MO_MANAGEMENT_PROTOCOL_OUT 0x10
 180 /* values for variable length command */
 181 #define XDREAD_32             0x03
 182 #define XDWRITE_32            0x04
 183 #define XPWRITE_32            0x06
 184 #define XDWRITEREAD_32        0x07
 185 #define READ_32               0x09
 186 #define VERIFY_32             0x0a
 187 #define WRITE_32              0x0b
 188 #define WRITE_SAME_32         0x0d
 189
 190 /* Values for T10/04-262r7 */
 191 #define ATA_16                0x85      /* 16-byte pass-thru */
 192 #define ATA_12                0xa1      /* 12-byte pass-thru */
 193
 194 /*
 195  *      SCSI command lengths
 196  */
 197
 198 #define SCSI_MAX_VARLEN_CDB_SIZE 260
 199
 200 /* defined in T10 SCSI Primary Commands-2 (SPC2) */
 201 struct scsi_varlen_cdb_hdr {
 202         __u8 opcode;        /* opcode always == VARIABLE_LENGTH_CMD */
 203         __u8 control;
 204         __u8 misc[5];
 205         __u8 additional_cdb_length;         /* total cdb length - 8 */
 206         __be16 service_action;
 207         /* service specific data follows */
 208 };
 209
 210 static inline unsigned
 211 scsi_varlen_cdb_length(const void *hdr)
 212 {
 213         return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
 214 }
 215
 216 extern const unsigned char scsi_command_size_tbl[8];
 217 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
 218
 219 static inline unsigned
 220 scsi_command_size(const unsigned char *cmnd)
 221 {
 222         return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
 223                 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
 224 }
 225
 226 #ifdef CONFIG_ACPI
 227 struct acpi_bus_type;
 228
 229 extern int
 230 scsi_register_acpi_bus_type(struct acpi_bus_type *bus);
 231
 232 extern void
 233 scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
 234 #endif
 235
 236 /*
 237  *  SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
 238  *  T10/1561-D Revision 4 Draft dated 7th November 2002.
 239  */
 240 #define SAM_STAT_GOOD            0x00
 241 #define SAM_STAT_CHECK_CONDITION 0x02
 242 #define SAM_STAT_CONDITION_MET   0x04
 243 #define SAM_STAT_BUSY            0x08
 244 #define SAM_STAT_INTERMEDIATE    0x10
 245 #define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
 246 #define SAM_STAT_RESERVATION_CONFLICT 0x18
 247 #define SAM_STAT_COMMAND_TERMINATED 0x22        /* obsolete in SAM-3 */
 248 #define SAM_STAT_TASK_SET_FULL   0x28
 249 #define SAM_STAT_ACA_ACTIVE      0x30
 250 #define SAM_STAT_TASK_ABORTED    0x40
 251
 252 /** scsi_status_is_good - check the status return.
 253  *
 254  * @status: the status passed up from the driver (including host and
 255  *          driver components)
 256  *
 257  * This returns true for known good conditions that may be treated as
 258  * command completed normally
 259  */
 260 static inline int scsi_status_is_good(int status)
 261 {
 262         /*
 263          * FIXME: bit0 is listed as reserved in SCSI-2, but is
 264          * significant in SCSI-3.  For now, we follow the SCSI-2
 265          * behaviour and ignore reserved bits.
 266          */
 267         status &= 0xfe;
 268         return ((status == SAM_STAT_GOOD) ||
 269                 (status == SAM_STAT_INTERMEDIATE) ||
 270                 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
 271                 /* FIXME: this is obsolete in SAM-3 */
 272                 (status == SAM_STAT_COMMAND_TERMINATED));
 273 }
 274
 275 /*
 276  *  Status codes. These are deprecated as they are shifted 1 bit right
 277  *  from those found in the SCSI standards. This causes confusion for
 278  *  applications that are ported to several OSes. Prefer SAM Status codes
 279  *  above.
 280  */
 281
 282 #define GOOD                 0x00
 283 #define CHECK_CONDITION      0x01
 284 #define CONDITION_GOOD       0x02
 285 #define BUSY                 0x04
 286 #define INTERMEDIATE_GOOD    0x08
 287 #define INTERMEDIATE_C_GOOD  0x0a
 288 #define RESERVATION_CONFLICT 0x0c
 289 #define COMMAND_TERMINATED   0x11
 290 #define QUEUE_FULL           0x14
 291 #define ACA_ACTIVE           0x18
 292 #define TASK_ABORTED         0x20
 293
 294 #define STATUS_MASK          0xfe
 295
 296 /*
 297  *  SENSE KEYS
 298  */
 299
 300 #define NO_SENSE            0x00
 301 #define RECOVERED_ERROR     0x01
 302 #define NOT_READY           0x02
 303 #define MEDIUM_ERROR        0x03
 304 #define HARDWARE_ERROR      0x04
 305 #define ILLEGAL_REQUEST     0x05
 306 #define UNIT_ATTENTION      0x06
 307 #define DATA_PROTECT        0x07
 308 #define BLANK_CHECK         0x08
 309 #define COPY_ABORTED        0x0a
 310 #define ABORTED_COMMAND     0x0b
 311 #define VOLUME_OVERFLOW     0x0d
 312 #define MISCOMPARE          0x0e
 313
 314
 315 /*
 316  *  DEVICE TYPES
 317  *  Please keep them in 0x%02x format for $MODALIAS to work
 318  */
 319
 320 #define TYPE_DISK           0x00
 321 #define TYPE_TAPE           0x01
 322 #define TYPE_PRINTER        0x02
 323 #define TYPE_PROCESSOR      0x03    /* HP scanners use this */
 324 #define TYPE_WORM           0x04    /* Treated as ROM by our system */
 325 #define TYPE_ROM            0x05
 326 #define TYPE_SCANNER        0x06
 327 #define TYPE_MOD            0x07    /* Magneto-optical disk -
 328                                      * - treated as TYPE_DISK */
 329 #define TYPE_MEDIUM_CHANGER 0x08
 330 #define TYPE_COMM           0x09    /* Communications device */
 331 #define TYPE_RAID           0x0c
 332 #define TYPE_ENCLOSURE      0x0d    /* Enclosure Services Device */
 333 #define TYPE_RBC            0x0e
 334 #define TYPE_OSD            0x11
 335 #define TYPE_NO_LUN         0x7f
 336
 337 /* SCSI protocols; these are taken from SPC-3 section 7.5 */
 338 enum scsi_protocol {
 339         SCSI_PROTOCOL_FCP = 0,  /* Fibre Channel */
 340         SCSI_PROTOCOL_SPI = 1,  /* parallel SCSI */
 341         SCSI_PROTOCOL_SSA = 2,  /* Serial Storage Architecture - Obsolete */
 342         SCSI_PROTOCOL_SBP = 3,  /* firewire */
 343         SCSI_PROTOCOL_SRP = 4,  /* Infiniband RDMA */
 344         SCSI_PROTOCOL_ISCSI = 5,
 345         SCSI_PROTOCOL_SAS = 6,
 346         SCSI_PROTOCOL_ADT = 7,  /* Media Changers */
 347         SCSI_PROTOCOL_ATA = 8,
 348         SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
 349 };
 350
 351 /* Returns a human-readable name for the device */
 352 extern const char * scsi_device_type(unsigned type);
 353
 354 /*
 355  * standard mode-select header prepended to all mode-select commands
 356  */
 357
 358 struct ccs_modesel_head {
 359         __u8 _r1;                       /* reserved */
 360         __u8 medium;            /* device-specific medium type */
 361         __u8 _r2;                       /* reserved */
 362         __u8 block_desc_length; /* block descriptor length */
 363         __u8 density;           /* device-specific density code */
 364         __u8 number_blocks_hi;  /* number of blocks in this block desc */
 365         __u8 number_blocks_med;
 366         __u8 number_blocks_lo;
 367         __u8 _r3;
 368         __u8 block_length_hi;   /* block length for blocks in this desc */
 369         __u8 block_length_med;
 370         __u8 block_length_lo;
 371 };
 372
 373 /*
 374  * ScsiLun: 8 byte LUN.
 375  */
 376 struct scsi_lun {
 377         __u8 scsi_lun[8];
 378 };
 379
 380 /*
 381  * The Well Known LUNS (SAM-3) in our int representation of a LUN
 382  */
 383 #define SCSI_W_LUN_BASE 0xc100
 384 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
 385 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
 386 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
 387
 388 static inline int scsi_is_wlun(unsigned int lun)
 389 {
 390         return (lun & 0xff00) == SCSI_W_LUN_BASE;
 391 }
 392
 393
 394 /*
 395  *  MESSAGE CODES
 396  */
 397
 398 #define COMMAND_COMPLETE    0x00
 399 #define EXTENDED_MESSAGE    0x01
 400 #define     EXTENDED_MODIFY_DATA_POINTER    0x00
 401 #define     EXTENDED_SDTR                   0x01
 402 #define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
 403 #define     EXTENDED_WDTR                   0x03
 404 #define     EXTENDED_PPR                    0x04
 405 #define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05
 406 #define SAVE_POINTERS       0x02
 407 #define RESTORE_POINTERS    0x03
 408 #define DISCONNECT          0x04
 409 #define INITIATOR_ERROR     0x05
 410 #define ABORT_TASK_SET      0x06
 411 #define MESSAGE_REJECT      0x07
 412 #define NOP                 0x08
 413 #define MSG_PARITY_ERROR    0x09
 414 #define LINKED_CMD_COMPLETE 0x0a
 415 #define LINKED_FLG_CMD_COMPLETE 0x0b
 416 #define TARGET_RESET        0x0c
 417 #define ABORT_TASK          0x0d
 418 #define CLEAR_TASK_SET      0x0e
 419 #define INITIATE_RECOVERY   0x0f            /* SCSI-II only */
 420 #define RELEASE_RECOVERY    0x10            /* SCSI-II only */
 421 #define CLEAR_ACA           0x16
 422 #define LOGICAL_UNIT_RESET  0x17
 423 #define SIMPLE_QUEUE_TAG    0x20
 424 #define HEAD_OF_QUEUE_TAG   0x21
 425 #define ORDERED_QUEUE_TAG   0x22
 426 #define IGNORE_WIDE_RESIDUE 0x23
 427 #define ACA                 0x24
 428 #define QAS_REQUEST         0x55
 429
 430 /* Old SCSI2 names, don't use in new code */
 431 #define BUS_DEVICE_RESET    TARGET_RESET
 432 #define ABORT               ABORT_TASK_SET
 433
 434 /*
 435  * Host byte codes
 436  */
 437
 438 #define DID_OK          0x00    /* NO error                                */
 439 #define DID_NO_CONNECT  0x01    /* Couldn't connect before timeout period  */
 440 #define DID_BUS_BUSY    0x02    /* BUS stayed busy through time out period */
 441 #define DID_TIME_OUT    0x03    /* TIMED OUT for other reason              */
 442 #define DID_BAD_TARGET  0x04    /* BAD target.                             */
 443 #define DID_ABORT       0x05    /* Told to abort for some other reason     */
 444 #define DID_PARITY      0x06    /* Parity error                            */
 445 #define DID_ERROR       0x07    /* Internal error                          */
 446 #define DID_RESET       0x08    /* Reset by somebody.                      */
 447 #define DID_BAD_INTR    0x09    /* Got an interrupt we weren't expecting.  */
 448 #define DID_PASSTHROUGH 0x0a    /* Force command past mid-layer            */
 449 #define DID_SOFT_ERROR  0x0b    /* The low level driver just wish a retry  */
 450 #define DID_IMM_RETRY   0x0c    /* Retry without decrementing retry count  */
 451 #define DID_REQUEUE     0x0d    /* Requeue command (no immediate retry) also
 452                                  * without decrementing the retry count    */
 453 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
 454                                       * and the driver blocked the port to
 455                                       * recover the link. Transport class will
 456                                       * retry or fail IO */
 457 #define DID_TRANSPORT_FAILFAST  0x0f /* Transport class fastfailed the io */
 458 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
 459                                  * other paths */
 460 #define DID_NEXUS_FAILURE 0x11  /* Permanent nexus failure, retry on other
 461                                  * paths might yield different results */
 462 #define DID_ALLOC_FAILURE 0x12  /* Space allocation on the device failed */
 463 #define DID_MEDIUM_ERROR  0x13  /* Medium error */
 464 #define DRIVER_OK       0x00    /* Driver status                           */
 465
 466 /*
 467  *  These indicate the error that occurred, and what is available.
 468  */
 469
 470 #define DRIVER_BUSY         0x01
 471 #define DRIVER_SOFT         0x02
 472 #define DRIVER_MEDIA        0x03
 473 #define DRIVER_ERROR        0x04
 474
 475 #define DRIVER_INVALID      0x05
 476 #define DRIVER_TIMEOUT      0x06
 477 #define DRIVER_HARD         0x07
 478 #define DRIVER_SENSE        0x08
 479
 480 /*
 481  * Internal return values.
 482  */
 483
 484 #define NEEDS_RETRY     0x2001
 485 #define SUCCESS         0x2002
 486 #define FAILED          0x2003
 487 #define QUEUED          0x2004
 488 #define SOFT_ERROR      0x2005
 489 #define ADD_TO_MLQUEUE  0x2006
 490 #define TIMEOUT_ERROR   0x2007
 491 #define SCSI_RETURN_NOT_HANDLED   0x2008
 492 #define FAST_IO_FAIL    0x2009
 493
 494 /*
 495  * Midlevel queue return values.
 496  */
 497 #define SCSI_MLQUEUE_HOST_BUSY   0x1055
 498 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
 499 #define SCSI_MLQUEUE_EH_RETRY    0x1057
 500 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
 501
 502 /*
 503  *  Use these to separate status msg and our bytes
 504  *
 505  *  These are set by:
 506  *
 507  *      status byte = set from target device
 508  *      msg_byte    = return status from host adapter itself.
 509  *      host_byte   = set by low-level driver to indicate status.
 510  *      driver_byte = set by mid-level.
 511  */
 512 #define status_byte(result) (((result) >> 1) & 0x7f)
 513 #define msg_byte(result)    (((result) >> 8) & 0xff)
 514 #define host_byte(result)   (((result) >> 16) & 0xff)
 515 #define driver_byte(result) (((result) >> 24) & 0xff)
 516
 517 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 518 #define sense_error(sense)  ((sense) & 0xf)
 519 #define sense_valid(sense)  ((sense) & 0x80)
 520
 521 /*
 522  * default timeouts
 523 */
 524 #define FORMAT_UNIT_TIMEOUT             (2 * 60 * 60 * HZ)
 525 #define START_STOP_TIMEOUT              (60 * HZ)
 526 #define MOVE_MEDIUM_TIMEOUT             (5 * 60 * HZ)
 527 #define READ_ELEMENT_STATUS_TIMEOUT     (5 * 60 * HZ)
 528 #define READ_DEFECT_DATA_TIMEOUT        (60 * HZ )
 529
 530
 531 #define IDENTIFY_BASE       0x80
 532 #define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
 533                      ((can_disconnect) ?  0x40 : 0) |\
 534                      ((lun) & 0x07))
 535
 536 /*
 537  *  struct scsi_device::scsi_level values. For SCSI devices other than those
 538  *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 539  *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 540  *  variable is visible to the user via sysfs.
 541  */
 542
 543 #define SCSI_UNKNOWN    0
 544 #define SCSI_1          1
 545 #define SCSI_1_CCS      2
 546 #define SCSI_2          3
 547 #define SCSI_3          4        /* SPC */
 548 #define SCSI_SPC_2      5
 549 #define SCSI_SPC_3      6
 550
 551 /*
 552  * INQ PERIPHERAL QUALIFIERS
 553  */
 554 #define SCSI_INQ_PQ_CON         0x00
 555 #define SCSI_INQ_PQ_NOT_CON     0x01
 556 #define SCSI_INQ_PQ_NOT_CAP     0x03
 557
 558
 559 /*
 560  * Here are some scsi specific ioctl commands which are sometimes useful.
 561  *
 562  * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 563  */
 564
 565 /* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
 566 #define SCSI_IOCTL_GET_IDLUN            0x5382
 567
 568 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
 569
 570 /* Used to obtain the host number of a device. */
 571 #define SCSI_IOCTL_PROBE_HOST           0x5385
 572
 573 /* Used to obtain the bus number for a device */
 574 #define SCSI_IOCTL_GET_BUS_NUMBER       0x5386
 575
 576 /* Used to obtain the PCI location of a device */
 577 #define SCSI_IOCTL_GET_PCI              0x5387
 578
 579 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
 580 static inline __u32 scsi_to_u32(__u8 *ptr)
 581 {
 582         return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
 583 }
 584
 585 #endif /* _SCSI_SCSI_H */