Man page 9 : ccw_device_start_key

ccw_device_start_key - start a s390 channel program with key

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

cdev
    target ccw device

cpa
    logical start address of channel program

intparm
    user specific interruption parameter; will be presented back to cdevAqs 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.

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).

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.

Interrupts disabled, ccw device lock held

Cornelia Huck <>
    Author.