CCW_DEVICE_START(9)                        The ccw bus                        CCW_DEVICE_START(9)



NAME
       ccw_device_start - start a s390 channel program

SYNOPSIS
       int ccw_device_start(struct ccw_device * cdev, struct ccw1 * cpa, unsigned long intparm,
                            __u8 lpm, unsigned long flags);

ARGUMENTS
       cdev
           target ccw device

       cpa
           logical start address of channel program

       intparm
           user specific interruption parameter; will be presented back to cdev's interrupt
           handler. Allows a device driver to associate the interrupt with a particular I/O
           request.

       lpm
           defines the channel path to be used for a specific I/O request. A value of 0 will make
           cio use the opm.

       flags
           additional flags; defines the action to be performed for I/O processing.

DESCRIPTION
       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).

RETURN
       0, if the operation was successful; -EBUSY, if the device is busy, or status pending;
       -EACCES, if no path specified in lpm is operational; -ENODEV, if the device is not
       operational.

CONTEXT
       Interrupts disabled, ccw device lock held

AUTHOR
       Cornelia Huck <cornelia.huck AT de.com>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                       CCW_DEVICE_START(9)