SCSI_DEVICE(9S) Data Structures for Drivers SCSI_DEVICE(9S)

NAME

scsi_device - SCSI device structure

SYNOPSIS

#include <sys/scsi/scsi.h>

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

DESCRIPTION

The scsi_device structure stores common information about each SCSI
logical unit, including pointers to areas that contain both generic
and device specific information. There is one scsi_device structure
for each logical unit attached to the system. The host adapter driver
initializes part of this structure prior to probe(9E) and destroys
this structure after a probe failure or successful detach(9E).

STRUCTURE MEMBERS

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 */


sd_address contains the routing information that the target driver
normally copies into a scsi_pkt(9S) structure using the collection of
makecom(9F) functions. The SCSA library routines use this information
to determine which host adapter, SCSI bus, and target/logical unit
number (lun) a command is intended for. This structure is initialized
by the host adapter driver.


sd_dev is a pointer to the corresponding dev_info structure. This
pointer is initialized by the host adapter driver.


sd_mutex 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 mutex(9F).


sd_inq is initially NULL (zero). After executing scsi_probe(9F), this
field contains the inquiry data associated with the particular
device.


sd_sense is initially NULL (zero). If the target driver wants to use
this field for storing REQUEST SENSE data, it should allocate an
scsi_extended_sense(9S) buffer and set this field to the address of
this buffer.


sd_private is reserved for the use of target drivers and should
generally be used to point to target specific data structures.

SEE ALSO

detach(9E), probe(9E), makecom(9F), mutex(9F), scsi_probe(9F),
scsi_extended_sense(9S), scsi_pkt(9S)


Writing Device Drivers

February 19, 1993 SCSI_DEVICE(9S)