NAME ccw_device_start_key - start a s390 channel program with key

SYNOPSIS int ccw_device_start_key(struct ccw_device * cdev, struct ccw1 * cpa, unsigned long intparm, __u8 lpm, __u8 key, 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.

key storage key to be used for the I/O

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 <> Author.

COPYRIGHT Kernel Hackers Manual 2.6. September 2014 CCW_DEVICE_START_KEY(9)