SCSI Device Driver

The SCSI device driver can optionally be informed by the SCSI adapter device driver whenever all buffers for this device are in use. This is known as a maximum-buffer-usage event.

To pass this information, the SCSI device driver must be registered for notification of asynchronous event status from the SCSI adapter device driver. Registration is done by calling the SCSI adapter device-driver ioctl entry point with the SCIOEVENT operation. If registering for event notification, the SCSI device driver receives notification of all asynchronous events, not just the maximum buffer usage event.