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
  15 struct scsi_cmnd;
  16
  17 enum scsi_timeouts {
  18         SCSI_DEFAULT_EH_TIMEOUT         = 10 * HZ,
  19 };
  20
  21 /*
  22  * DIX-capable adapters effectively support infinite chaining for the
  23  * protection information scatterlist
  24  */
  25 #define SCSI_MAX_PROT_SG_SEGMENTS       0xFFFF
  26
  27 /*
  28  * Special value for scanning to specify scanning or rescanning of all
  29  * possible channels, (target) ids, or luns on a given shost.
  30  */
  31 #define SCAN_WILD_CARD  ~0
  32
  33 /** scsi_status_is_good - check the status return.
  34  *
  35  * @status: the status passed up from the driver (including host and
  36  *          driver components)
  37  *
  38  * This returns true for known good conditions that may be treated as
  39  * command completed normally
  40  */
  41 static inline int scsi_status_is_good(int status)
  42 {
  43         /*
  44          * FIXME: bit0 is listed as reserved in SCSI-2, but is
  45          * significant in SCSI-3.  For now, we follow the SCSI-2
  46          * behaviour and ignore reserved bits.
  47          */
  48         status &= 0xfe;
  49         return ((status == SAM_STAT_GOOD) ||
  50                 (status == SAM_STAT_CONDITION_MET) ||
  51                 /* Next two "intermediate" statuses are obsolete in SAM-4 */
  52                 (status == SAM_STAT_INTERMEDIATE) ||
  53                 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
  54                 /* FIXME: this is obsolete in SAM-3 */
  55                 (status == SAM_STAT_COMMAND_TERMINATED));
  56 }
  57
  58
  59 /*
  60  * standard mode-select header prepended to all mode-select commands
  61  */
  62
  63 struct ccs_modesel_head {
  64         __u8 _r1;                       /* reserved */
  65         __u8 medium;            /* device-specific medium type */
  66         __u8 _r2;                       /* reserved */
  67         __u8 block_desc_length; /* block descriptor length */
  68         __u8 density;           /* device-specific density code */
  69         __u8 number_blocks_hi;  /* number of blocks in this block desc */
  70         __u8 number_blocks_med;
  71         __u8 number_blocks_lo;
  72         __u8 _r3;
  73         __u8 block_length_hi;   /* block length for blocks in this desc */
  74         __u8 block_length_med;
  75         __u8 block_length_lo;
  76 };
  77
  78 /*
  79  * The Well Known LUNS (SAM-3) in our int representation of a LUN
  80  */
  81 #define SCSI_W_LUN_BASE 0xc100
  82 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
  83 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
  84 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
  85
  86 static inline int scsi_is_wlun(u64 lun)
  87 {
  88         return (lun & 0xff00) == SCSI_W_LUN_BASE;
  89 }
  90
  91
  92 /*
  93  *  MESSAGE CODES
  94  */
  95
  96 #define COMMAND_COMPLETE    0x00
  97 #define EXTENDED_MESSAGE    0x01
  98 #define     EXTENDED_MODIFY_DATA_POINTER    0x00
  99 #define     EXTENDED_SDTR                   0x01
 100 #define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
 101 #define     EXTENDED_WDTR                   0x03
 102 #define     EXTENDED_PPR                    0x04
 103 #define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05
 104 #define SAVE_POINTERS       0x02
 105 #define RESTORE_POINTERS    0x03
 106 #define DISCONNECT          0x04
 107 #define INITIATOR_ERROR     0x05
 108 #define ABORT_TASK_SET      0x06
 109 #define MESSAGE_REJECT      0x07
 110 #define NOP                 0x08
 111 #define MSG_PARITY_ERROR    0x09
 112 #define LINKED_CMD_COMPLETE 0x0a
 113 #define LINKED_FLG_CMD_COMPLETE 0x0b
 114 #define TARGET_RESET        0x0c
 115 #define ABORT_TASK          0x0d
 116 #define CLEAR_TASK_SET      0x0e
 117 #define INITIATE_RECOVERY   0x0f            /* SCSI-II only */
 118 #define RELEASE_RECOVERY    0x10            /* SCSI-II only */
 119 #define CLEAR_ACA           0x16
 120 #define LOGICAL_UNIT_RESET  0x17
 121 #define SIMPLE_QUEUE_TAG    0x20
 122 #define HEAD_OF_QUEUE_TAG   0x21
 123 #define ORDERED_QUEUE_TAG   0x22
 124 #define IGNORE_WIDE_RESIDUE 0x23
 125 #define ACA                 0x24
 126 #define QAS_REQUEST         0x55
 127
 128 /* Old SCSI2 names, don't use in new code */
 129 #define BUS_DEVICE_RESET    TARGET_RESET
 130 #define ABORT               ABORT_TASK_SET
 131
 132 /*
 133  * Host byte codes
 134  */
 135
 136 #define DID_OK          0x00    /* NO error                                */
 137 #define DID_NO_CONNECT  0x01    /* Couldn't connect before timeout period  */
 138 #define DID_BUS_BUSY    0x02    /* BUS stayed busy through time out period */
 139 #define DID_TIME_OUT    0x03    /* TIMED OUT for other reason              */
 140 #define DID_BAD_TARGET  0x04    /* BAD target.                             */
 141 #define DID_ABORT       0x05    /* Told to abort for some other reason     */
 142 #define DID_PARITY      0x06    /* Parity error                            */
 143 #define DID_ERROR       0x07    /* Internal error                          */
 144 #define DID_RESET       0x08    /* Reset by somebody.                      */
 145 #define DID_BAD_INTR    0x09    /* Got an interrupt we weren't expecting.  */
 146 #define DID_PASSTHROUGH 0x0a    /* Force command past mid-layer            */
 147 #define DID_SOFT_ERROR  0x0b    /* The low level driver just wish a retry  */
 148 #define DID_IMM_RETRY   0x0c    /* Retry without decrementing retry count  */
 149 #define DID_REQUEUE     0x0d    /* Requeue command (no immediate retry) also
 150                                  * without decrementing the retry count    */
 151 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
 152                                       * and the driver blocked the port to
 153                                       * recover the link. Transport class will
 154                                       * retry or fail IO */
 155 #define DID_TRANSPORT_FAILFAST  0x0f /* Transport class fastfailed the io */
 156 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
 157                                  * other paths */
 158 #define DID_NEXUS_FAILURE 0x11  /* Permanent nexus failure, retry on other
 159                                  * paths might yield different results */
 160 #define DID_ALLOC_FAILURE 0x12  /* Space allocation on the device failed */
 161 #define DID_MEDIUM_ERROR  0x13  /* Medium error */
 162 #define DRIVER_OK       0x00    /* Driver status                           */
 163
 164 /*
 165  *  These indicate the error that occurred, and what is available.
 166  */
 167
 168 #define DRIVER_BUSY         0x01
 169 #define DRIVER_SOFT         0x02
 170 #define DRIVER_MEDIA        0x03
 171 #define DRIVER_ERROR        0x04
 172
 173 #define DRIVER_INVALID      0x05
 174 #define DRIVER_TIMEOUT      0x06
 175 #define DRIVER_HARD         0x07
 176 #define DRIVER_SENSE        0x08
 177
 178 /*
 179  * Internal return values.
 180  */
 181
 182 #define NEEDS_RETRY     0x2001
 183 #define SUCCESS         0x2002
 184 #define FAILED          0x2003
 185 #define QUEUED          0x2004
 186 #define SOFT_ERROR      0x2005
 187 #define ADD_TO_MLQUEUE  0x2006
 188 #define TIMEOUT_ERROR   0x2007
 189 #define SCSI_RETURN_NOT_HANDLED   0x2008
 190 #define FAST_IO_FAIL    0x2009
 191
 192 /*
 193  * Midlevel queue return values.
 194  */
 195 #define SCSI_MLQUEUE_HOST_BUSY   0x1055
 196 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
 197 #define SCSI_MLQUEUE_EH_RETRY    0x1057
 198 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
 199
 200 /*
 201  *  Use these to separate status msg and our bytes
 202  *
 203  *  These are set by:
 204  *
 205  *      status byte = set from target device
 206  *      msg_byte    = return status from host adapter itself.
 207  *      host_byte   = set by low-level driver to indicate status.
 208  *      driver_byte = set by mid-level.
 209  */
 210 #define status_byte(result) (((result) >> 1) & 0x7f)
 211 #define msg_byte(result)    (((result) >> 8) & 0xff)
 212 #define host_byte(result)   (((result) >> 16) & 0xff)
 213 #define driver_byte(result) (((result) >> 24) & 0xff)
 214
 215 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 216 #define sense_error(sense)  ((sense) & 0xf)
 217 #define sense_valid(sense)  ((sense) & 0x80)
 218
 219 /*
 220  * default timeouts
 221 */
 222 #define FORMAT_UNIT_TIMEOUT             (2 * 60 * 60 * HZ)
 223 #define START_STOP_TIMEOUT              (60 * HZ)
 224 #define MOVE_MEDIUM_TIMEOUT             (5 * 60 * HZ)
 225 #define READ_ELEMENT_STATUS_TIMEOUT     (5 * 60 * HZ)
 226 #define READ_DEFECT_DATA_TIMEOUT        (60 * HZ )
 227
 228
 229 #define IDENTIFY_BASE       0x80
 230 #define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
 231                      ((can_disconnect) ?  0x40 : 0) |\
 232                      ((lun) & 0x07))
 233
 234 /*
 235  *  struct scsi_device::scsi_level values. For SCSI devices other than those
 236  *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 237  *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 238  *  variable is visible to the user via sysfs.
 239  */
 240
 241 #define SCSI_UNKNOWN    0
 242 #define SCSI_1          1
 243 #define SCSI_1_CCS      2
 244 #define SCSI_2          3
 245 #define SCSI_3          4        /* SPC */
 246 #define SCSI_SPC_2      5
 247 #define SCSI_SPC_3      6
 248
 249 /*
 250  * INQ PERIPHERAL QUALIFIERS
 251  */
 252 #define SCSI_INQ_PQ_CON         0x00
 253 #define SCSI_INQ_PQ_NOT_CON     0x01
 254 #define SCSI_INQ_PQ_NOT_CAP     0x03
 255
 256
 257 /*
 258  * Here are some scsi specific ioctl commands which are sometimes useful.
 259  *
 260  * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 261  */
 262
 263 /* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
 264 #define SCSI_IOCTL_GET_IDLUN            0x5382
 265
 266 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
 267
 268 /* Used to obtain the host number of a device. */
 269 #define SCSI_IOCTL_PROBE_HOST           0x5385
 270
 271 /* Used to obtain the bus number for a device */
 272 #define SCSI_IOCTL_GET_BUS_NUMBER       0x5386
 273
 274 /* Used to obtain the PCI location of a device */
 275 #define SCSI_IOCTL_GET_PCI              0x5387
 276
 277 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
 278 static inline __u32 scsi_to_u32(__u8 *ptr)
 279 {
 280         return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
 281 }
 282
 283 #endif /* _SCSI_SCSI_H */