tran_dmafree(9E)						Driver Entry Points						  tran_dmafree(9E)

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 structure. See scsi_address(9S).

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

DESCRIPTION

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

       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)

       Writing Device Drivers

NOTES

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

SunOS 5.10							    30 Aug 1995 						  tran_dmafree(9E)