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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).

Arguments

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.

Context

scsi_sync_pkt() may be called from user or interrupt context.

Examples

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_transport(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.

See Also

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

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