Man page 9 : ccw_device_start_timeout

ccw_device_start_timeout - start a s390 channel program with timeout

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

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.

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

expires
    timeout value in jiffies

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). This function notifies the device driver if the channel program has not completed during the time specified by expires. If a timeout occurs, the channel program is terminated via xsch, hsch or csch, and the deviceAqs interrupt handler will be called with an irb containing ERR_PTR(-ETIMEDOUT).

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.