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

scsi_device - SCSI device structure

#include <sys/scsi/scsi.h>

illumos DDI specific (illumos DDI).

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).

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.

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

Writing Device Drivers

February 19, 1993 OmniOS