include/scsi/scsi.h

   1 /*
   2  * This header file contains public constants and structures used by
   3  * the SCSI initiator code.
   4  */
   5 #ifndef _SCSI_SCSI_H
   6 #define _SCSI_SCSI_H
   7
   8 #include <linux/types.h>
   9 #include <linux/scatterlist.h>
  10 #include <linux/kernel.h>
  11 #include <scsi/scsi_common.h>
  12 #include <scsi/scsi_proto.h>
  13
  14 struct scsi_cmnd;
  15
  16 enum scsi_timeouts {
  17         SCSI_DEFAULT_EH_TIMEOUT         = 10 * HZ,
  18 };
  19
  20 /*
  21  * DIX-capable adapters effectively support infinite chaining for the
  22  * protection information scatterlist
  23  */
  24 #define SCSI_MAX_PROT_SG_SEGMENTS       0xFFFF
  25
  26 /*
  27  * Special value for scanning to specify scanning or rescanning of all
  28  * possible channels, (target) ids, or luns on a given shost.
  29  */
  30 #define SCAN_WILD_CARD  ~0
  31
  32 #ifdef CONFIG_ACPI
  33 struct acpi_bus_type;
  34
  35 extern int
  36 scsi_register_acpi_bus_type(struct acpi_bus_type *bus);
  37
  38 extern void
  39 scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
  40 #endif
  41
  42 /** scsi_status_is_good - check the status return.
  43  *
  44  * @status: the status passed up from the driver (including host and
  45  *          driver components)
  46  *
  47  * This returns true for known good conditions that may be treated as
  48  * command completed normally
  49  */
  50 static inline int scsi_status_is_good(int status)
  51 {
  52         /*
  53          * FIXME: bit0 is listed as reserved in SCSI-2, but is
  54          * significant in SCSI-3.  For now, we follow the SCSI-2
  55          * behaviour and ignore reserved bits.
  56          */
  57         status &= 0xfe;
  58         return ((status == SAM_STAT_GOOD) ||
  59                 (status == SAM_STAT_INTERMEDIATE) ||
  60                 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
  61                 /* FIXME: this is obsolete in SAM-3 */
  62                 (status == SAM_STAT_COMMAND_TERMINATED));
  63 }
  64
  65
  66 /*
  67  * standard mode-select header prepended to all mode-select commands
  68  */
  69
  70 struct ccs_modesel_head {
  71         __u8 _r1;                       /* reserved */
  72         __u8 medium;            /* device-specific medium type */
  73         __u8 _r2;                       /* reserved */
  74         __u8 block_desc_length; /* block descriptor length */
  75         __u8 density;           /* device-specific density code */
  76         __u8 number_blocks_hi;  /* number of blocks in this block desc */
  77         __u8 number_blocks_med;
  78         __u8 number_blocks_lo;
  79         __u8 _r3;
  80         __u8 block_length_hi;   /* block length for blocks in this desc */
  81         __u8 block_length_med;
  82         __u8 block_length_lo;
  83 };
  84
  85 /*
  86  * The Well Known LUNS (SAM-3) in our int representation of a LUN
  87  */
  88 #define SCSI_W_LUN_BASE 0xc100
  89 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
  90 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
  91 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
  92
  93 static inline int scsi_is_wlun(u64 lun)
  94 {
  95         return (lun & 0xff00) == SCSI_W_LUN_BASE;
  96 }
  97
  98
  99 /*
 100  *  MESSAGE CODES
 101  */
 102
 103 #define COMMAND_COMPLETE    0x00
 104 #define EXTENDED_MESSAGE    0x01
 105 #define     EXTENDED_MODIFY_DATA_POINTER    0x00
 106 #define     EXTENDED_SDTR                   0x01
 107 #define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
 108 #define     EXTENDED_WDTR                   0x03
 109 #define     EXTENDED_PPR                    0x04
 110 #define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05
 111 #define SAVE_POINTERS       0x02
 112 #define RESTORE_POINTERS    0x03
 113 #define DISCONNECT          0x04
 114 #define INITIATOR_ERROR     0x05
 115 #define ABORT_TASK_SET      0x06
 116 #define MESSAGE_REJECT      0x07
 117 #define NOP                 0x08
 118 #define MSG_PARITY_ERROR    0x09
 119 #define LINKED_CMD_COMPLETE 0x0a
 120 #define LINKED_FLG_CMD_COMPLETE 0x0b
 121 #define TARGET_RESET        0x0c
 122 #define ABORT_TASK          0x0d
 123 #define CLEAR_TASK_SET      0x0e
 124 #define INITIATE_RECOVERY   0x0f            /* SCSI-II only */
 125 #define RELEASE_RECOVERY    0x10            /* SCSI-II only */
 126 #define CLEAR_ACA           0x16
 127 #define LOGICAL_UNIT_RESET  0x17
 128 #define SIMPLE_QUEUE_TAG    0x20
 129 #define HEAD_OF_QUEUE_TAG   0x21
 130 #define ORDERED_QUEUE_TAG   0x22
 131 #define IGNORE_WIDE_RESIDUE 0x23
 132 #define ACA                 0x24
 133 #define QAS_REQUEST         0x55
 134
 135 /* Old SCSI2 names, don't use in new code */
 136 #define BUS_DEVICE_RESET    TARGET_RESET
 137 #define ABORT               ABORT_TASK_SET
 138
 139 /*
 140  * Host byte codes
 141  */
 142
 143 #define DID_OK          0x00    /* NO error                                */
 144 #define DID_NO_CONNECT  0x01    /* Couldn't connect before timeout period  */
 145 #define DID_BUS_BUSY    0x02    /* BUS stayed busy through time out period */
 146 #define DID_TIME_OUT    0x03    /* TIMED OUT for other reason              */
 147 #define DID_BAD_TARGET  0x04    /* BAD target.                             */
 148 #define DID_ABORT       0x05    /* Told to abort for some other reason     */
 149 #define DID_PARITY      0x06    /* Parity error                            */
 150 #define DID_ERROR       0x07    /* Internal error                          */
 151 #define DID_RESET       0x08    /* Reset by somebody.                      */
 152 #define DID_BAD_INTR    0x09    /* Got an interrupt we weren't expecting.  */
 153 #define DID_PASSTHROUGH 0x0a    /* Force command past mid-layer            */
 154 #define DID_SOFT_ERROR  0x0b    /* The low level driver just wish a retry  */
 155 #define DID_IMM_RETRY   0x0c    /* Retry without decrementing retry count  */
 156 #define DID_REQUEUE     0x0d    /* Requeue command (no immediate retry) also
 157                                  * without decrementing the retry count    */
 158 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
 159                                       * and the driver blocked the port to
 160                                       * recover the link. Transport class will
 161                                       * retry or fail IO */
 162 #define DID_TRANSPORT_FAILFAST  0x0f /* Transport class fastfailed the io */
 163 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
 164                                  * other paths */
 165 #define DID_NEXUS_FAILURE 0x11  /* Permanent nexus failure, retry on other
 166                                  * paths might yield different results */
 167 #define DID_ALLOC_FAILURE 0x12  /* Space allocation on the device failed */
 168 #define DID_MEDIUM_ERROR  0x13  /* Medium error */
 169 #define DRIVER_OK       0x00    /* Driver status                           */
 170
 171 /*
 172  *  These indicate the error that occurred, and what is available.
 173  */
 174
 175 #define DRIVER_BUSY         0x01
 176 #define DRIVER_SOFT         0x02
 177 #define DRIVER_MEDIA        0x03
 178 #define DRIVER_ERROR        0x04
 179
 180 #define DRIVER_INVALID      0x05
 181 #define DRIVER_TIMEOUT      0x06
 182 #define DRIVER_HARD         0x07
 183 #define DRIVER_SENSE        0x08
 184
 185 /*
 186  * Internal return values.
 187  */
 188
 189 #define NEEDS_RETRY     0x2001
 190 #define SUCCESS         0x2002
 191 #define FAILED          0x2003
 192 #define QUEUED          0x2004
 193 #define SOFT_ERROR      0x2005
 194 #define ADD_TO_MLQUEUE  0x2006
 195 #define TIMEOUT_ERROR   0x2007
 196 #define SCSI_RETURN_NOT_HANDLED   0x2008
 197 #define FAST_IO_FAIL    0x2009
 198
 199 /*
 200  * Midlevel queue return values.
 201  */
 202 #define SCSI_MLQUEUE_HOST_BUSY   0x1055
 203 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
 204 #define SCSI_MLQUEUE_EH_RETRY    0x1057
 205 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
 206
 207 /*
 208  *  Use these to separate status msg and our bytes
 209  *
 210  *  These are set by:
 211  *
 212  *      status byte = set from target device
 213  *      msg_byte    = return status from host adapter itself.
 214  *      host_byte   = set by low-level driver to indicate status.
 215  *      driver_byte = set by mid-level.
 216  */
 217 #define status_byte(result) (((result) >> 1) & 0x7f)
 218 #define msg_byte(result)    (((result) >> 8) & 0xff)
 219 #define host_byte(result)   (((result) >> 16) & 0xff)
 220 #define driver_byte(result) (((result) >> 24) & 0xff)
 221
 222 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 223 #define sense_error(sense)  ((sense) & 0xf)
 224 #define sense_valid(sense)  ((sense) & 0x80)
 225
 226 /*
 227  * default timeouts
 228 */
 229 #define FORMAT_UNIT_TIMEOUT             (2 * 60 * 60 * HZ)
 230 #define START_STOP_TIMEOUT              (60 * HZ)
 231 #define MOVE_MEDIUM_TIMEOUT             (5 * 60 * HZ)
 232 #define READ_ELEMENT_STATUS_TIMEOUT     (5 * 60 * HZ)
 233 #define READ_DEFECT_DATA_TIMEOUT        (60 * HZ )
 234
 235
 236 #define IDENTIFY_BASE       0x80
 237 #define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
 238                      ((can_disconnect) ?  0x40 : 0) |\
 239                      ((lun) & 0x07))
 240
 241 /*
 242  *  struct scsi_device::scsi_level values. For SCSI devices other than those
 243  *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 244  *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 245  *  variable is visible to the user via sysfs.
 246  */
 247
 248 #define SCSI_UNKNOWN    0
 249 #define SCSI_1          1
 250 #define SCSI_1_CCS      2
 251 #define SCSI_2          3
 252 #define SCSI_3          4        /* SPC */
 253 #define SCSI_SPC_2      5
 254 #define SCSI_SPC_3      6
 255
 256 /*
 257  * INQ PERIPHERAL QUALIFIERS
 258  */
 259 #define SCSI_INQ_PQ_CON         0x00
 260 #define SCSI_INQ_PQ_NOT_CON     0x01
 261 #define SCSI_INQ_PQ_NOT_CAP     0x03
 262
 263
 264 /*
 265  * Here are some scsi specific ioctl commands which are sometimes useful.
 266  *
 267  * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 268  */
 269
 270 /* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
 271 #define SCSI_IOCTL_GET_IDLUN            0x5382
 272
 273 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
 274
 275 /* Used to obtain the host number of a device. */
 276 #define SCSI_IOCTL_PROBE_HOST           0x5385
 277
 278 /* Used to obtain the bus number for a device */
 279 #define SCSI_IOCTL_GET_BUS_NUMBER       0x5386
 280
 281 /* Used to obtain the PCI location of a device */
 282 #define SCSI_IOCTL_GET_PCI              0x5387
 283
 284 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
 285 static inline __u32 scsi_to_u32(__u8 *ptr)
 286 {
 287         return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
 288 }
 289
 290 #endif /* _SCSI_SCSI_H */