CCW_DEVICE_START

Section: The ccw bus (9)
Updated: February 2011
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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).

RETURNS

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@de.ibm.com>

: Author.