include/scsi/scsi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * This header file contains public constants and structures used by
   4  * the SCSI initiator code.
   5  */
   6 #ifndef _SCSI_SCSI_H
   7 #define _SCSI_SCSI_H
   8
   9 #include <linux/types.h>
  10 #include <linux/scatterlist.h>
  11 #include <linux/kernel.h>
  12 #include <scsi/scsi_common.h>
  13 #include <scsi/scsi_proto.h>
  14 #include <scsi/scsi_status.h>
  15
  16 struct scsi_cmnd;
  17
  18 enum scsi_timeouts {
  19         SCSI_DEFAULT_EH_TIMEOUT         = 10 * HZ,
  20 };
  21
  22 /*
  23  * DIX-capable adapters effectively support infinite chaining for the
  24  * protection information scatterlist
  25  */
  26 #define SCSI_MAX_PROT_SG_SEGMENTS       0xFFFF
  27
  28 /*
  29  * Special value for scanning to specify scanning or rescanning of all
  30  * possible channels, (target) ids, or luns on a given shost.
  31  */
  32 #define SCAN_WILD_CARD  ~0
  33
  34 /*
  35  * standard mode-select header prepended to all mode-select commands
  36  */
  37
  38 struct ccs_modesel_head {
  39         __u8 _r1;                       /* reserved */
  40         __u8 medium;            /* device-specific medium type */
  41         __u8 _r2;                       /* reserved */
  42         __u8 block_desc_length; /* block descriptor length */
  43         __u8 density;           /* device-specific density code */
  44         __u8 number_blocks_hi;  /* number of blocks in this block desc */
  45         __u8 number_blocks_med;
  46         __u8 number_blocks_lo;
  47         __u8 _r3;
  48         __u8 block_length_hi;   /* block length for blocks in this desc */
  49         __u8 block_length_med;
  50         __u8 block_length_lo;
  51 };
  52
  53 /*
  54  * The Well Known LUNS (SAM-3) in our int representation of a LUN
  55  */
  56 #define SCSI_W_LUN_BASE 0xc100
  57 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
  58 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
  59 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
  60
  61 static inline int scsi_is_wlun(u64 lun)
  62 {
  63         return (lun & 0xff00) == SCSI_W_LUN_BASE;
  64 }
  65
  66 /**
  67  * scsi_status_is_check_condition - check the status return.
  68  *
  69  * @status: the status passed up from the driver (including host and
  70  *          driver components)
  71  *
  72  * This returns true if the status code is SAM_STAT_CHECK_CONDITION.
  73  */
  74 static inline int scsi_status_is_check_condition(int status)
  75 {
  76         if (status < 0)
  77                 return false;
  78         status &= 0xfe;
  79         return status == SAM_STAT_CHECK_CONDITION;
  80 }
  81
  82 /*
  83  *  Extended message codes.
  84  */
  85 #define     EXTENDED_MODIFY_DATA_POINTER    0x00
  86 #define     EXTENDED_SDTR                   0x01
  87 #define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
  88 #define     EXTENDED_WDTR                   0x03
  89 #define     EXTENDED_PPR                    0x04
  90 #define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05
  91
  92 /*
  93  * Internal return values.
  94  */
  95 enum scsi_disposition {
  96         NEEDS_RETRY             = 0x2001,
  97         SUCCESS                 = 0x2002,
  98         FAILED                  = 0x2003,
  99         QUEUED                  = 0x2004,
 100         SOFT_ERROR              = 0x2005,
 101         ADD_TO_MLQUEUE          = 0x2006,
 102         TIMEOUT_ERROR           = 0x2007,
 103         SCSI_RETURN_NOT_HANDLED = 0x2008,
 104         FAST_IO_FAIL            = 0x2009,
 105 };
 106
 107 /*
 108  * Midlevel queue return values.
 109  */
 110 #define SCSI_MLQUEUE_HOST_BUSY   0x1055
 111 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
 112 #define SCSI_MLQUEUE_EH_RETRY    0x1057
 113 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
 114
 115 /*
 116  *  Use these to separate status msg and our bytes
 117  *
 118  *  These are set by:
 119  *
 120  *      status byte = set from target device
 121  *      msg_byte    (unused)
 122  *      host_byte   = set by low-level driver to indicate status.
 123  */
 124 #define status_byte(result) (result & 0xff)
 125 #define host_byte(result)   (((result) >> 16) & 0xff)
 126
 127 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 128 #define sense_error(sense)  ((sense) & 0xf)
 129 #define sense_valid(sense)  ((sense) & 0x80)
 130
 131 /*
 132  * default timeouts
 133 */
 134 #define FORMAT_UNIT_TIMEOUT             (2 * 60 * 60 * HZ)
 135 #define START_STOP_TIMEOUT              (60 * HZ)
 136 #define MOVE_MEDIUM_TIMEOUT             (5 * 60 * HZ)
 137 #define READ_ELEMENT_STATUS_TIMEOUT     (5 * 60 * HZ)
 138 #define READ_DEFECT_DATA_TIMEOUT        (60 * HZ )
 139
 140
 141 #define IDENTIFY_BASE       0x80
 142 #define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
 143                      ((can_disconnect) ?  0x40 : 0) |\
 144                      ((lun) & 0x07))
 145
 146 /*
 147  *  struct scsi_device::scsi_level values. For SCSI devices other than those
 148  *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 149  *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 150  *  variable is visible to the user via sysfs.
 151  */
 152
 153 #define SCSI_UNKNOWN    0
 154 #define SCSI_1          1
 155 #define SCSI_1_CCS      2
 156 #define SCSI_2          3
 157 #define SCSI_3          4        /* SPC */
 158 #define SCSI_SPC_2      5
 159 #define SCSI_SPC_3      6
 160
 161 /*
 162  * INQ PERIPHERAL QUALIFIERS
 163  */
 164 #define SCSI_INQ_PQ_CON         0x00
 165 #define SCSI_INQ_PQ_NOT_CON     0x01
 166 #define SCSI_INQ_PQ_NOT_CAP     0x03
 167
 168
 169 /*
 170  * Here are some scsi specific ioctl commands which are sometimes useful.
 171  *
 172  * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 173  */
 174
 175 /* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
 176 #define SCSI_IOCTL_GET_IDLUN            0x5382
 177
 178 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
 179
 180 /* Used to obtain the host number of a device. */
 181 #define SCSI_IOCTL_PROBE_HOST           0x5385
 182
 183 /* Used to obtain the bus number for a device */
 184 #define SCSI_IOCTL_GET_BUS_NUMBER       0x5386
 185
 186 /* Used to obtain the PCI location of a device */
 187 #define SCSI_IOCTL_GET_PCI              0x5387
 188
 189 /** scsi_status_is_good - check the status return.
 190  *
 191  * @status: the status passed up from the driver (including host and
 192  *          driver components)
 193  *
 194  * This returns true for known good conditions that may be treated as
 195  * command completed normally
 196  */
 197 static inline bool scsi_status_is_good(int status)
 198 {
 199         if (status < 0)
 200                 return false;
 201
 202         if (host_byte(status) == DID_NO_CONNECT)
 203                 return false;
 204
 205         /*
 206          * FIXME: bit0 is listed as reserved in SCSI-2, but is
 207          * significant in SCSI-3.  For now, we follow the SCSI-2
 208          * behaviour and ignore reserved bits.
 209          */
 210         status &= 0xfe;
 211         return ((status == SAM_STAT_GOOD) ||
 212                 (status == SAM_STAT_CONDITION_MET) ||
 213                 /* Next two "intermediate" statuses are obsolete in SAM-4 */
 214                 (status == SAM_STAT_INTERMEDIATE) ||
 215                 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
 216                 /* FIXME: this is obsolete in SAM-3 */
 217                 (status == SAM_STAT_COMMAND_TERMINATED));
 218 }
 219
 220 #endif /* _SCSI_SCSI_H */