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bus_teardown_intr.9freebsd

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Version: 308324 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)


BSD mandoc

NAME

BUS_SETUP_INTR bus_setup_intr BUS_TEARDOWN_INTR bus_teardown_intr - create, attach and teardown an interrupt handler

SYNOPSIS

In sys/param.h In sys/bus.h Ft int Fo BUS_SETUP_INTR Fa device_t dev device_t child struct resource *irq int flags Fa driver_filter_t *filter driver_intr_t *ithread void *arg Fa void **cookiep Fc Ft int Fo bus_setup_intr Fa device_t dev struct resource *r int flags Fa driver_filter_t filter driver_intr_t ithread void *arg Fa void **cookiep Fc Ft int Fo BUS_TEARDOWN_INTR Fa device_t dev device_t child struct resource *irq void *cookiep Fc Ft int Fn bus_teardown_intr device_t dev struct resource *r void *cookiep

DESCRIPTION

The Fn BUS_SETUP_INTR method will create and attach an interrupt handler to an interrupt previously allocated by the resource manager's BUS_ALLOC_RESOURCE9 method. The Fa flags are found in In sys/bus.h , and give the broad category of interrupt. The Fa flags also tell the interrupt handlers about certain device driver characteristics. INTR_EXCL marks the handler as being an exclusive handler for this interrupt. INTR_MPSAFE tells the scheduler that the interrupt handler is well behaved in a preemptive environment (``SMP safe''), and does not need to be protected by the ``Giant Lock'' mutex. INTR_ENTROPY marks the interrupt as being a good source of entropy - this may be used by the entropy device /dev/random

To define a time-critical handler (previously known as INTR_FAST that will not execute any potentially blocking operation, use the Fa filter argument. Otherwise, use the Fa ithread argument. The defined handler will be called with the value Fa arg as its only argument.

The Fa cookiep argument is a pointer to a Vt void * that Fn BUS_SETUP_INTR will write a cookie for the parent bus' use to if it is successful in establishing an interrupt. Driver writers may assume that this cookie will be non-zero. The nexus driver will write 0 on failure to Fa cookiep .

The interrupt handler will be detached by Fn BUS_TEARDOWN_INTR . The cookie needs to be passed to Fn BUS_TEARDOWN_INTR in order to tear down the correct interrupt handler. Once Fn BUS_TEARDOWN_INTR returns, it is guaranteed that the interrupt function is not active and will no longer be called.

Mutexes are not allowed to be held across calls to these functions.

RETURN VALUES

Zero is returned on success, otherwise an appropriate error is returned.

SEE ALSO

random(4), device(9), driver(9)

AUTHORS

An -nosplit This manual page was written by An Jeroen Ruigrok van der Werven Aq asmodai@FreeBSD.org based on the manual pages for Fn BUS_CREATE_INTR and Fn BUS_CONNECT_INTR written by An Doug Rabson Aq dfr@FreeBSD.org .
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