scsi_device Structure

The HBA framework allocates and initializes a scsi_device(9S) structure for each instance of a target device before calling an HBA driver's tran_tgt_init(9E) entry point. This structure stores information about each SCSI logical unit, including pointers to information areas that contain both generic and device-specific information. There is one scsi_device(9S) structure for each target device instance attached to the system.

If the per-target initialization is successful (in other words, if either tran_tgt_init(9E) returns success or the vector is NULL), the HBA framework will set the target driver's per-instance private data to point to the scsi_device(9S) structure, using ddi_set_driver_private(9F).

The scsi_device(9S) structure contains the following fields:

struct scsi_device {
    struct scsi_address          sd_address;    /* routing information */
    dev_info_t                   *sd_dev;       /* device dev_info node */
    kmutex_t                     sd_mutex;      /* mutex used by device */
    void                         *sd_reserved;
    struct scsi_inquiry          *sd_inq;
    struct scsi_extended_sense   *sd_sense;
    caddr_t                      sd_private;    /* for driver's use */
};

sd_address

Data structure that is passed to the SCSI resource allocation routines.

sd_dev

Pointer to the target's dev_info structure.

sd_mutex

Mutex for use by the target driver. This is initialized by the HBA framework and can be used by the target driver as a per-device mutex. This mutex should not be held across a call to scsi_transport(9F) or scsi_poll(9F). See Chapter 3, Multithreading for more information on mutexes.

sd_inq

Pointer for the target device's SCSI inquiry data. The scsi_probe(9F) routine allocates a buffer, fills it in, and attaches it to this field.

sd_sense

Pointer to a buffer to contain Request Sense data from the device. The target driver must allocate and manage this buffer itself. See the target driver's attach(9E) routine in The attach() Entry Point for more information.

sd_private

Pointer field for use by the target driver. It is commonly used to store a pointer to a private target driver state structure.