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DEV_DESC(9s)
NAME
  DEV_DESC - SCSI/CAM: Defines the device descriptor structure

SYNOPSIS
       typedef struct dev_desc {
	   u_char dd_pv_name[IDSTRING_SIZE];
	   u_char dd_length;
	   u_char dd_dev_name[DEV_NAME_SIZE];
	   U32 dd_device_type;
	   struct pt_info *dd_def_partition;
	   U32 dd_block_size;
	   U32 dd_max_record;
	   DENSITY_TBL *dd_density_tbl;
	   MODESEL_TBL *dd_modesel_tbl;
	   U32 dd_flags;
	   U32 dd_scsi_optcmds;
	   U32 dd_ready_time;
	   u_short dd_que_depth;
	   u_char dd_valid;
	   u_char dd_inq_len;
	   u_char dd_req_sense_len;
	   U32 dd_ref_count;
	   U32 dd_attribute_cnt;
	   DEV_ATTRIBUTE *dd_attributes;
	   struct dev_desc *dd_forw;
	   struct dev_desc *dd_back;
	   char dd_vid[DDR_VID_LENGTH];
	   char dd_pid[DDR_PID_LENGTH];
	   char dd_rev[DDR_REV_LENGTH];
	   simple_lock_data_t dd_desc_lk;
       } DEV_DESC;

MEMBERS
  dd_pv_name
      Contains the product ID and vendor string from inquiry data.

  dd_length
      Contains the length of the dd_pv_name string.

  dd_dev_name
      Contains the device name string.

  dd_device_type
      Bits 0 - 23 contain one of the following device classes:







      _______________________________________
      Class	      Description
      _______________________________________
      SZ_HARD_DISK    Hard disk (Winchester)
      SZ_CDROM	      Hard disk (Winchester)
      SZ_FLOP_3	      3.5" diskette
      SZ_FLOP_5	      5.25" diskette
      SZ_RAID	      RAID target controller
      SZ_TK_CLASS     TK50, TK30 class tapes
      SZ_RDAT_CLASS   RDAT tlz04 class tapes
      SZ_9TRK_CLASS   9-track tapes
      SZ_QIC_CLASS    Qic tapes (tzk10)
      SZ_8MM_CLASS    8-millimeter (exabytes)
      SZ_3480_CLASS   3480 cartridge class
      SZ_LOADER
      _______________________________________

      Bits 24 - 31 contain the SCSI device type. The CAM_EDT_ENTRY structure
      lists the device types.

  dd_def_partition
      Contains the default partition sizes, disks only.

  dd_block_size
      Contains the block or sector size.

  dd_max_record
      Contains the maximum transfer size in bytes allowed for the device.

  dd_density_tbl
      Contains a pointer to the density table, tapes only.

  dd_modesel_tbl
      Contains a pointer to the mode select table, used on open and recovery.

  dd_flags
      Contains one or more of the following option flags:


      ______________________________________________________________
      Flag		  Description
      ______________________________________________________________
      SZ_NO_FLAGS	  No flags.
      SZ_BBR		  Allows bad block recovery.
      SZ_NOSYNC		  Does not allow synchronous data transfer.
      SZ_DYNAMIC_GEOM

			  Device sizes can change (dynamic
			  geometry).
      SZ_NO_DISC	  Does not allow disconnects.
      SZ_NO_TAG

			  Does not allow tagged queueing regardless
			  of inquiry data.
      SZ_REORDER	  Allows the SIM to reorder CCBs.
      SZ_LONG_STO_RETRY	  Does long select timeout retries.
      SZ_DISPERSE_QUE

			  Allows the queue depth to be spread across
			  all LUNs for a given target.
      SZ_NOWIDE		  Does not do wide transfers.
      SZ_WCE_CAPABLE	  Device is capable of running with WCE.
      ______________________________________________________________

  dd_scsi_optcmnd
      Specifies one or more of the following flags, indicating any optional
      commands supported by the device:





      ___________________________________________
      Command	      Description
      ___________________________________________
      NO_OPT_CMDS     No optional commands
      SZ_RW10	      Read/write 10 byte CDBs
      SZ_PREV_ALLOW   Prevent/allow media removal
      SZ_EXT_RESRV    Extent reserve/release
      ___________________________________________

  dd_ready_time
      Specifies the number of seconds from power up until the device is
      ready. The default is 45 seconds, defined by the constant SZ_READY_DEF.

  dd_que_depth
      Specifies the number of CCBs that can be placed on a queue at one time,
      for devices that support command queueing.

  dd_valid
      Indicates which data length fields are valid, as follows:

	·
	DD_REQSNS_VAL indicates that the request sense length is valid.

	·
	DD_INQ_VAL indicates that the inquiry data length is valid.

  dd_inq_len
      Specifies the length of inquiry data for this device.

  dd_req_sense_len
      Specifies the length of sense data for this device.

  dd_ref_count
      Specifies the number of references to this device descriptor.

  dd_attribute_cnt
      Specifies the number of attributes created by default.

  dd_attributes
      Contains a linked list of attributes.

  dd_forw
      Specifies a pointer to the next device descriptor in a linked list.

  dd_back
      Specifies a pointer to the previous device descriptor in a linked list.

  dd_vid

  dd_pid

  dd_rev

  dd_desc_lk

DESCRIPTION
  The DEV_DESC structure describes the characteristics of the device, such as
  its name and device type.  It contains pointers to the mode select and
  density tables, as well.  There is one DEV_DESC structure for each device
  type.





FILES
  </usr/sys/include/io/cam/pdrv.h>

Index for Section 9

Alphabetical listing for D

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