'\" t
.\"     Title: ccw_device_start
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: July 2017
.\"    Manual: The ccw bus
.\"    Source: Kernel Hackers Manual 4.11.6
.\"  Language: English
.\"
.TH "CCW_DEVICE_START" "9" "July 2017" "Kernel Hackers Manual 4\&.11\&" "The ccw bus"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
ccw_device_start \- start a s390 channel program
.SH "SYNOPSIS"
.HP \w'int\ ccw_device_start('u
.BI "int ccw_device_start(struct\ ccw_device\ *\ " "cdev" ", struct\ ccw1\ *\ " "cpa" ", unsigned\ long\ " "intparm" ", __u8\ " "lpm" ", unsigned\ long\ " "flags" ");"
.SH "ARGUMENTS"
.PP
\fIstruct ccw_device * cdev\fR
.RS 4
target ccw device
.RE
.PP
\fIstruct ccw1 * cpa\fR
.RS 4
logical start address of channel program
.RE
.PP
\fIunsigned long intparm\fR
.RS 4
user specific interruption parameter; will be presented back to
\fIcdev\fR\*(Aqs interrupt handler\&. Allows a device driver to associate the interrupt with a particular I/O request\&.
.RE
.PP
\fI__u8 lpm\fR
.RS 4
defines the channel path to be used for a specific I/O request\&. A value of 0 will make cio use the opm\&.
.RE
.PP
\fIunsigned long flags\fR
.RS 4
additional flags; defines the action to be performed for I/O processing\&.
.RE
.SH "DESCRIPTION"
.PP
Start a S/390 channel program\&. When the interrupt arrives, the IRQ handler is called, either immediately, delayed (dev\-end missing, or sense required) or never (no IRQ handler registered)\&.
.SH "RETURN"
.PP
\fB0\fR, if the operation was successful; \-\fBEBUSY\fR, if the device is busy, or status pending; \-\fBEACCES\fR, if no path specified in
\fIlpm\fR
is operational; \-\fBENODEV\fR, if the device is not operational\&.
.SH "CONTEXT"
.PP
Interrupts disabled, ccw device lock held
.SH "AUTHOR"
.PP
\fBCornelia Huck\fR <\&cornelia.huck@de.ibm.com\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br