opensolaris man page for scsi_sync_pkt

scsi_sync_pkt(9F)					   Kernel Functions for Drivers 					 scsi_sync_pkt(9F)

NAME
       scsi_sync_pkt - synchronize CPU and I/O views of memory

SYNOPSIS
       #include <sys/scsi/scsi.h>

       void scsi_sync_pkt(struct scsi_pkt *pktp);

INTERFACE LEVEL
       Solaris DDI specific (Solaris DDI).

PARAMETERS
       pktp    Pointer to a scsi_pkt(9S) structure.

DESCRIPTION
       The  scsi_sync_pkt()  function is used to selectively synchronize a CPU's or device's view of the data associated with the SCSI packet that
       has been mapped for I/O. This may involve operations such as flushes of CPU or I/O caches, as well as other more complex operations such as
       stalling until hardware write buffers have drained.

       This  function  need only be called under certain circumstances. When a SCSI packet is mapped for I/O using scsi_init_pkt(9F) and destroyed
       using scsi_destroy_pkt(9F), then an implicit scsi_sync_pkt() will be performed. However, if the memory object has been modified	by  either
       the device or a CPU after the mapping by scsi_init_pkt(9F), then a call to scsi_sync_pkt() is required.

       If  the same scsi_pkt is reused for a data transfer from memory to a device, then scsi_sync_pkt() must be called before calling scsi_trans-
       port(9F). If the same packet is reused for a data transfer from a device to memory scsi_sync_pkt() must be called after the  completion	of
       the packet but before accessing the data in memory.

CONTEXT
       The scsi_sync_pkt() function may be called from user, interrupt, or kernel context.

SEE ALSO
       tran_sync_pkt(9E), ddi_dma_sync(9F), scsi_destroy_pkt(9F), scsi_init_pkt(9F), scsi_transport(9F), scsi_pkt(9S)

       Writing Device Drivers

SunOS 5.11							    16 Jan 2006 						 scsi_sync_pkt(9F)