svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
scsi_pktalloc(9f)
scsi_pktalloc(9F) Kernel Functions scsi_pktalloc(9F)
NAME
scsi_pktalloc, scsi_resalloc, scsi_pktfree, scsi_resfree - SCSI packet
utility routines
SYNOPSIS
#include <sys/scsi/scsi.h>
struct scsi_pkt *scsi_pktalloc (struct scsi_address* ap, int cmdlen,
int statuslen, int (*callback)(void));
struct scsi_pkt *scsi_resalloc (struct scsi_address* ap, int cmdlen,
int statuslen, opaque_t dmatoken, int (*callback)(void));
void scsi_pktfree (struct scsi_pkt* pkt);
void scsi_resfree (struct scsi_pkt* pkt);
INTERFACE LEVEL
The scsi_pktalloc(), scsi_pktfree(), scsi_resalloc(), and scsi_res‐
free() functions are obsolete. The scsi_pktalloc() and scsi_resalloc()
functions have been replaced by scsi_init_pkt(9F). The scsi_pktfree()
and scsi_resfree() functions have been replaced by
scsi_destroy_pkt(9F).
PARAMETERS
ap Pointer to a scsi_address structure.
cmdlen The required length for the SCSI command descriptor block
(CDB) in bytes.
statuslen The required length for the SCSI status completion block
(SCB) in bytes.
dmatoken Pointer to an implementation-dependent object.
callback A pointer to a callback function, or NULL_FUNC or
SLEEP_FUNC.
pkt Pointer to a scsi_pkt(9S) structure.
DESCRIPTION
The scsi_pktalloc() function requests the host adapter driver to allo‐
cate a command packet. For commands that have a data transfer associ‐
ated with them, scsi_resalloc() should be used.
ap is a pointer to a scsi_address structure. Allocator routines use it
to determine the associated host adapter.
The cmdlen parameter is the required length for the SCSI command
descriptor block. This block is allocated such that a kernel virtual
address is established in the pkt_cdbp field of the allocated scsi_pkt
structure.
statuslen is the required length for the SCSI status completion block.
The address of the allocated block is placed into the pkt_scbp field of
the scsi_pkt structure.
The dmatoken parameter is a pointer to an implementation dependent
object which defines the length, direction, and address of the data
transfer associated with this SCSI packet (command). The dmatoken must
be a pointer to a buf(9S) structure. If dmatoken is NULL, no DMA
resources are required by this SCSI command, so none are allocated.
Only one transfer direction is allowed per command. If there is an
unexpected data transfer phase (either no data transfer phase expected,
or the wrong direction encountered), the command is terminated with the
pkt_reason set to CMD_DMA_DERR. dmatoken provides the information to
determine if the transfer count is correct.
callback indicates what the allocator routines 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 allo‐
cate resources but again failed to do so), 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.
The scsi_pktfree() function frees the packet.
The scsi_resfree() function free all resources held by the packet and
the packet itself.
RETURN VALUES
Both allocation routines return a pointer to a scsi_pkt structure on
success, or NULL on failure.
CONTEXT
If callback is SLEEP_FUNC, then this routine can be called only from
user or kernel context. Otherwise, it can be called from user, kernel,
or interrupt context. The callback function may not block or call rou‐
tines that block. Both deallocation routines can be called from user,
kernel, or interrupt context.
ATTRIBUTES
See attributes(7) for a description of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Stability LevelObsolete
SEE ALSO
attributes(7), scsi_dmafree(9F), scsi_dmaget(9F), buf(9S), scsi_pkt(9S)
Writing Device Drivers in Oracle Solaris 11.4
NOTES
The scsi_pktalloc(), scsi_pktfree(), scsi_resalloc(), and scsi_res‐
free() functions are obsolete and will be discontinued in a future
release. The scsi_pktalloc() and scsi_resalloc() functions have been
replaced by scsi_init_pkt(9F). The scsi_pktfree() and scsi_resfree()
functions have been replaced by scsi_destroy_pkt(9F).
Oracle Solaris 11.4 16 Jan 2006 scsi_pktalloc(9F)