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Name

tran_dmafree - SCSI HBA DMA deallocation entry point

Synopsis

#include <sys/scsi/scsi.h>

void prefixtran_dmafree(struct scsi_address *ap, struct scsi_pkt *pkt);

Interface Level

Solaris architecture specific (Solaris DDI).

Arguments

ap
A pointer to a scsi_address(9S) structure.
pkt
A pointer to a scsi_pkt(9S) structure.

Description

The tran_dmafree() vector in the scsi_hba_tran(9S) structure must be initialized during the HBA driver’s attach(9E) to point to an HBA entry point to be called when a target driver calls scsi_dmafree(9F) .

tran_dmafree() must deallocate any DMA resources previously allocated to this pkt in a call to tran_init_pkt(9E) . tran_dmafree() should not free the structure pointed to by pkt itself. Since tran_destroy_pkt(9E) must also free DMA resources, it is important that the HBA driver keeps accurate note of whether scsi_pkt(9S) structures have DMA resources allocated.

See Also

attach(9E) , tran_destroy_pkt(9E) , tran_init_pkt(9E) , scsi_dmafree(9F) , scsi_dmaget(9F) , scsi_hba_attach(9F) , scsi_init_pkt(9F) , scsi_address(9S) , scsi_hba_tran(9S) , scsi_pkt(9S)

Notes

A target driver may call tran_dmafree() on packets for which no DMA resources were allocated.

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