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scsi_dmaget(9f) [bsd man page]

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

NAME
scsi_dmaget, scsi_dmafree - SCSI dma utility routines SYNOPSIS
#include <sys/scsi/scsi.h> struct scsi_pkt *scsi_dmaget(struct scsi_pkt *pkt, opaque_t dmatoken, int(*callback)(void)); void scsi_dmafree(struct scsi_pkt *pkt); INTERFACE LEVEL
These interfaces are obsolete. Use scsi_init_pkt(9F) instead of scsi_dmaget(). Use scsi_destroy_pkt(9F) instead of scsi_dmafree(). PARAMETERS
pkt A pointer to a scsi_pkt(9S) structure. dmatoken Pointer to an implementation dependent object callback Pointer to a callback function, or NULL_FUNC or SLEEP_FUNC. DESCRIPTION
scsi_dmaget() allocates DMA resources for an already allocated SCSI packet. pkt is a pointer to the previously allocated SCSI packet (see scsi_pktalloc(9F)). dmatoken is a pointer to an implementation dependent object which defines the length, direction, and address of the data transfer associ- ated with this SCSI packet (command). The dmatoken must be a pointer to a buf(9S) structure. If dmatoken is NULL, no resources are allo- cated. callback indicates what scsi_dmaget() should do when resources are not available: NULL_FUNC Do not wait for resources. Return a NULL pointer. SLEEP_FUNC Wait indefinitely for resources. Other Values callback points to a function which is called when resources may have become available. callback must return either 0 (indicating that it attempted to allocate resources but failed to do so again), in which case it is put back on a list to be called again later, or 1 indicating either success in allocating resources or indicating that it no longer cares for a retry. scsi_dmafree() frees the DMA resources associated with the SCSI packet. The packet itself remains allocated. RETURN VALUES
scsi_dmaget() returns a pointer to a scsi_pkt on success. It returns NULL if resources are not available. CONTEXT
If callback is SLEEP_FUNC, then this routine may only be called from user-level code. Otherwise, it may be called from either user or interrupt level. The callback function may not block or call routines that block. scsi_dmafree() can be called from user or interrupt context. ATTRIBUTES
See attributes(5) for a description of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Stability Level |Obsolete | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5), scsi_pktalloc(9F), scsi_pktfree(9F), scsi_resalloc(9F), scsi_resfree(9F), buf(9S), scsi_pkt(9S) Writing Device Drivers NOTES
The scsi_dmaget() and scsi_dmafree() functions are obsolete and will be discontinued in a future release. These functions have been replaced by, respectively, scsi_init_pkt(9F) and scsi_destroy_pkt(9F). SunOS 5.10 27 Sep 2002 scsi_dmaget(9F)

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

NAME
scsi_dmaget, scsi_dmafree - SCSI dma utility routines SYNOPSIS
#include <sys/scsi/scsi.h> struct scsi_pkt *scsi_dmaget(struct scsi_pkt *pkt, opaque_t dmatoken, int(*callback)(void)); void scsi_dmafree(struct scsi_pkt *pkt); INTERFACE LEVEL
These interfaces are obsolete. Use scsi_init_pkt(9F) instead of scsi_dmaget(). Use scsi_destroy_pkt(9F) instead of scsi_dmafree(). PARAMETERS
pkt A pointer to a scsi_pkt(9S) structure. dmatoken Pointer to an implementation dependent object callback Pointer to a callback function, or NULL_FUNC or SLEEP_FUNC. DESCRIPTION
scsi_dmaget() allocates DMA resources for an already allocated SCSI packet. pkt is a pointer to the previously allocated SCSI packet (see scsi_pktalloc(9F)). dmatoken is a pointer to an implementation dependent object which defines the length, direction, and address of the data transfer associ- ated with this SCSI packet (command). The dmatoken must be a pointer to a buf(9S) structure. If dmatoken is NULL, no resources are allo- cated. callback indicates what scsi_dmaget() should do when resources are not available: NULL_FUNC Do not wait for resources. Return a NULL pointer. SLEEP_FUNC Wait indefinitely for resources. Other Values callback points to a function which is called when resources may have become available. callback must return either 0 (indicating that it attempted to allocate resources but failed to do so again), in which case it is put back on a list to be called again later, or 1 indicating either success in allocating resources or indicating that it no longer cares for a retry. scsi_dmafree() frees the DMA resources associated with the SCSI packet. The packet itself remains allocated. RETURN VALUES
scsi_dmaget() returns a pointer to a scsi_pkt on success. It returns NULL if resources are not available. CONTEXT
If callback is SLEEP_FUNC, then this routine may only be called from user-level code. Otherwise, it may be called from either user or interrupt level. The callback function may not block or call routines that block. scsi_dmafree() can be called from user or interrupt context. ATTRIBUTES
See attributes(5) for a description of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Stability Level |Obsolete | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5), scsi_pktalloc(9F), scsi_pktfree(9F), scsi_resalloc(9F), scsi_resfree(9F), buf(9S), scsi_pkt(9S) Writing Device Drivers NOTES
The scsi_dmaget() and scsi_dmafree() functions are obsolete and will be discontinued in a future release. These functions have been replaced by, respectively, scsi_init_pkt(9F) and scsi_destroy_pkt(9F). SunOS 5.10 27 Sep 2002 scsi_dmaget(9F)

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