CCW_DEVICE_START_KEY(9) 					    The ccw bus 					   CCW_DEVICE_START_KEY(9)

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 <cornelia.huck@de.ibm.com>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   CCW_DEVICE_START_KEY(9)