'\" te
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.TH SCSI_DEVICE 9S "Feb 19, 1993"
.SH NAME
scsi_device \- SCSI device structure
.SH SYNOPSIS
.nf
#include <sys/scsi/scsi.h>
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI).
.SH DESCRIPTION
The \fBscsi_device\fR structure stores common information about each SCSI
logical unit, including pointers to areas that contain both generic and device
specific information. There is one \fBscsi_device\fR structure for each logical
unit attached to the system. The host adapter driver initializes part of this
structure prior to \fBprobe\fR(9E) and destroys this structure after a probe
failure or successful \fBdetach\fR(9E).
.SH STRUCTURE MEMBERS
.in +2
.nf
struct scsi_address        sd_address; /* Routing info. */
dev_info_t                 *sd_dev;    /* Cross-ref. to */
                                       /* dev_info_t */
kmutex_t                   sd_mutex;   /* Mutex for this dev. */
struct scsi_inquiry        *sd_inq;    /* scsi_inquiry data struc. */
struct scsi_extended_sense *sd_sense;  /* Optional request */
                                       /* sense buffer ptr */
caddr_t                    sd_private; /* Target drivers
                                          private data */
.fi
.in -2

.sp
.LP
\fBsd_address\fR contains the routing information that the target driver
normally copies into a \fBscsi_pkt\fR(9S) structure using the collection of
\fBmakecom\fR(9F) functions. The \fBSCSA\fR library routines use this
information to determine which host adapter, \fBSCSI\fR bus, and target/logical
unit number (lun) a command is intended for. This structure is initialized by
the host adapter driver.
.sp
.LP
\fBsd_dev\fR is a pointer to the corresponding \fBdev_info\fR structure. This
pointer is initialized by the host adapter driver.
.sp
.LP
\fBsd_mutex\fR is a mutual exclusion lock for this device. It is used to
serialize access to a device. The host adapter driver initializes this mutex.
See \fBmutex\fR(9F).
.sp
.LP
\fBsd_inq\fR is initially \fINULL\fR (zero). After executing
\fBscsi_probe\fR(9F), this field contains the inquiry data associated with the
particular device.
.sp
.LP
\fBsd_sense\fR is initially \fINULL\fR (zero). If the target driver wants to
use this field for storing \fBREQUEST SENSE\fR data, it should allocate an
\fBscsi_extended_sense\fR(9S) buffer and set this field to the address of this
buffer.
.sp
.LP
\fBsd_private\fR is reserved for the use of target drivers and should generally
be used to point to target specific data structures.
.SH SEE ALSO
\fBdetach\fR(9E), \fBprobe\fR(9E), \fBmakecom\fR(9F), \fBmutex\fR(9F),
\fBscsi_probe\fR(9F), \fBscsi_extended_sense\fR(9S), \fBscsi_pkt\fR(9S)
.sp
.LP
\fIWriting Device Drivers\fR