scsi_hba_pkt_free(9F)
NAME
scsi_hba_pkt_alloc, scsi_hba_pkt_free - allocate and free a
scsi_pkt structure
SYNOPSIS
#include <sys/scsi/scsi.h>
struct scsi_pkt *scsi_hba_pkt_alloc(dev_info_t *dip, struct
scsi_address *ap, int cmdlen, int statuslen, int tgtlen, int
hbalen, int (*callback, caddr_t arg, caddr_t arg);
void scsi_hba_pkt_free(struct scsi_address *ap, struct
scsi_pkt *pkt);
INTERFACE LEVEL
Solaris architecture specific (Solaris DDI).
PARAMETERS
dip Pointer to a dev_info_t structure, defining the HBA
driver instance.
ap Pointer to a scsi_address(9S) structure, defining the
target instance.
cmdlen
Length in bytes to be allocated for the SCSI command
descriptor block (CDB).
statuslen
Length in bytes to be allocated for the SCSI status
completion block (SCB).
tgtlen
Length in bytes to be allocated for a private data
area for the target driver's exclusive use.
hbalen
Length in bytes to be allocated for a private data
area for the HBA driver's exclusive use.
callback
Indicates what scsi_hba_pkt_alloc() should do when
resources are not available:
NULL_FUNC
Do not wait for resources. Return a NULL
pointer.
SLEEP_FUNC
Wait indefinitely for resources.
arg Must be NULL.
pkt A pointer to a scsi_pkt(9S) structure.
DESCRIPTION
For scsi_hba_pkt_alloc():
scsi_hba_pkt_alloc() allocates space for a scsi_pkt struc-
ture. HBA drivers must use this interface when allocating a
scsi_pkt from their tran_init_pkt(9E) entry point.
If callback is NULL_FUNC, scsi_hba_pkt_alloc() may not
sleep when allocating resources, and callers should be
prepared to deal with allocation failures.
scsi_hba_pkt_alloc() copies the scsi_address(9S) structure
pointed to by ap to the pkt_address field in the
scsi_pkt(9S).
scsi_hba_pkt_alloc() also allocates memory for these
scsi_pkt(9S) data areas, and sets these fields to point to
the allocated memory:
pkt_ha_private
HBA private data area.
pkt_private
Target driver private data area.
pkt_scbp
SCSI status completion block.
pkt_cdbp
SCSI command descriptor block.
For scsi_hba_pkt_free():
scsi_hba_pkt_free() frees the space allocated for the
scsi_pkt(9S) structure.
RETURN VALUES
scsi_hba_pkt_alloc() returns a pointer to the scsi_pkt
structure, or NULL if no space is available.
CONTEXT
scsi_hba_pkt_alloc() can be called from user or interrupt
context. Drivers must not allow scsi_hba_pkt_alloc() to
sleep if called from an interrupt routine.
scsi_hba_pkt_free() can be called from user or interrupt
context.
SEE ALSO
tran_init_pkt(9E), scsi_address(9S), scsi_pkt(9S)
Writing Device Drivers
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