'\" te
.\"  Copyright (c) 2000 Sun Microsystems, Inc.  All Rights Reserved.
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.  See the License for the specific language governing permissions and limitations under the License.
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.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)