TRACE_SOFTIRQ_ENTRY(9) IRQ TRACE_SOFTIRQ_ENTRY(9)NAME
trace_softirq_entry - called immediately before the softirq handler
SYNOPSIS
void trace_softirq_entry(unsigned int vec_nr);
ARGUMENTS
vec_nr
softirq vector number
DESCRIPTION
When used in combination with the softirq_exit tracepoint we can determine the softirq handler runtine.
AUTHORS
Jason Baron <jbaron@redhat.com>
Author.
William Cohen <wcohen@redhat.com>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 TRACE_SOFTIRQ_ENTRY(9)
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CCW_DEVICE_START(9) The ccw bus CCW_DEVICE_START(9)NAME
ccw_device_start - start a s390 channel program
SYNOPSIS
int ccw_device_start(struct ccw_device * cdev, struct ccw1 * cpa, unsigned long intparm, __u8 lpm, 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.
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(9)
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