Writing Device Drivers

getinfo() Entry Point (SCSI Target Drivers)

The getinfo(9E) routine for SCSI target drivers is much the same as for other drivers (see getinfo() Entry Point for more information on DDI_INFO_DEVT2INSTANCE case). However, in the DDI_INFO_DEVT2DEVINFO case of the getinfo() routine, the target driver must return a pointer to its dev_info node. This pointer can be saved in the driver state structure or can be retrieved from the sd_dev field of the scsi_device(9S) structure. The following example shows an alternative SCSI target driver getinfo() code fragment.

Example 17–4 Alternative SCSI Target Driver getinfo() Code Fragment

    dev = (dev_t)arg;
    instance = getminor(dev);
    xsp = ddi_get_soft_state(statep, instance);
    if (xsp == NULL)
        return (DDI_FAILURE);
    *result = (void *)xsp->sdp->sd_dev;
    return (DDI_SUCCESS);