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scsi_destroy_pkt(9f) [sunos man page]

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

NAME
scsi_destroy_pkt - free an allocated SCSI packet and its DMA resource SYNOPSIS
#include <sys/scsi/scsi.h> void scsi_destroy_pkt(struct scsi_pkt *pktp); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). PARAMETERS
pktp Pointer to a scsi_pkt(9S) structure. DESCRIPTION
scsi_destroy_pkt() releases all necessary resources, typically at the end of an I/O transfer. The data is synchronized to memory, then the DMA resources are deallocated and pktp is freed. CONTEXT
scsi_destroy_pkt() may be called from user or interrupt context. EXAMPLES
Example 1: Releasing resources. scsi_destroy_pkt(un->un_rqs); SEE ALSO
tran_destroy_pkt(9E), scsi_init_pkt(9F), scsi_pkt(9S) Writing Device Drivers SunOS 5.10 30 Aug 1995 scsi_destroy_pkt(9F)

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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
scsi_sync_pkt() 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
scsi_sync_pkt() may be called from user or interrupt 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 5.10 25 Feb 1994 scsi_sync_pkt(9F)
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