z8530_tx_begin(9) [centos man page]

Z8530_TX_BEGIN(9)						Internal Functions						 Z8530_TX_BEGIN(9)

NAME

       z8530_tx_begin - Begin packet transmission

SYNOPSIS

       void z8530_tx_begin(struct z8530_channel * c);

ARGUMENTS

       c
	   The Z8530 channel to kick

DESCRIPTION

       This is the speed sensitive side of transmission. If we are called and no buffer is being transmitted we commence the next buffer. If
       nothing is queued we idle the sync.

NOTE

       We are handling this code path in the interrupt path, keep it fast or bad things will happen.

       Called with the lock held.

AUTHOR

       Alan Cox <alan@lxorguk.ukuu.org.uk>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							 Z8530_TX_BEGIN(9)

CCW_DEVICE_START_TIM(9) 					    The ccw bus 					   CCW_DEVICE_START_TIM(9)

NAME

       ccw_device_start_timeout - start a s390 channel program with timeout

SYNOPSIS

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

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.

       expires
	   timeout value in jiffies

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). 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 device's
       interrupt handler will be called with an irb containing ERR_PTR(-ETIMEDOUT).

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_TIM(9)