'\" te
.\"  Copyright (c) 2000 Sun Microsystems, Inc.  All Rights Reserved.
.TH tran_quiesce 9E "31 Jan 1999" "SunOS 5.11" "Driver Entry Points"
.SH NAME
tran_quiesce, tran_unquiesce \- quiesce and unquiesce a SCSI bus
.SH SYNOPSIS
.LP
.nf
#include <sys/scsi/scsi.h>

\fBint prefix\fR\fBtran_quiesce\fR(\fBdev_info_t\fR \fI*hba_dip\fR);
.fi

.LP
.nf
\fBint prefix\fR\fBtran_unquiesce\fR(\fBdev_info_t\fR \fI*hba_dip\fR);
.fi

.SH INTERFACE LEVEL
.sp
.LP
Solaris DDI
.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIhba_dip\fR\fR
.ad
.RS 11n
.rt  
The \fBdev_info_t\fR pointer associated with the SCSI HBA.
.RE

.SH DESCRIPTION
.sp
.LP
The  \fBtran_quiesce()\fR and  \fBtran_unquiesce()\fR vectors in the \fBscsi_hba_tran\fR(9S) structure should be initialized during the HBA driver's  \fBattach\fR(9E). They are HBA entry points to be called when a user initiates quiesce and unquiesce operations through device control interfaces.
.sp
.LP
\fBtran_quiesce()\fR should wait for all outstanding commands to complete and blocks (or queues) any I/O requests issued. \fBtran_unquiesce()\fR should allow I/O activities to resume on the SCSI bus.
.sp
.LP
Implementation is hardware specific.
.SH RETURN VALUES
.sp
.LP
\fBtran_quiesce()\fR and \fBtran_unquiesce()\fR should return:
.sp
.ne 2
.mk
.na
\fB\fB0\fR\fR
.ad
.RS 12n
.rt  
Successful completion.
.RE

.sp
.ne 2
.mk
.na
\fB\fBNon-zero\fR\fR
.ad
.RS 12n
.rt  
An error occurred.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for a description of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
.TE

.SH SEE ALSO
.sp
.LP
\fBattributes\fR(5), \fBtran_bus_reset\fR(9E), \fBscsi_hba_tran\fR(9S)