2009-10-14 15:58:59 +00:00
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.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2009 Advanced Computing Technologies LLC
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.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 14, 2009
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.Dt BUS_BIND_INTR 9
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.Os
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.Sh NAME
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.Nm BUS_BIND_INTR ,
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.Nm bus_bind_intr
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.Nd "bind an interrupt resource to a specific CPU"
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/bus.h
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.Ft int
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.Fo BUS_BIND_INTR
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.Fa "device_t dev" "device_t child" "struct resource *irq" "int cpu"
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.Fc
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.Ft int
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.Fn bus_bind_intr "device_t dev" "struct resource *irq" "int cpu"
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.Sh DESCRIPTION
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The
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.Fn BUS_BIND_INTR
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method allows an interrupt resource to be pinned to a specific CPU.
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The interrupt resource must have an interrupt handler attached via
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.Xr BUS_SETUP_INTR 9 .
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The
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.Fa cpu
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parameter corresponds to the ID of a valid CPU in the system.
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Binding an interrupt restricts the
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.Xr cpuset 2
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of any associated interrupt threads to only include the specified CPU.
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It may also direct the low-level interrupt handling of the interrupt to the
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specified CPU as well,
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but this behavior is platform-dependent.
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If the value
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.Dv NOCPU
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is used for
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.Fa cpu ,
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then the interrupt will be
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.Dq unbound
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which restores any associated interrupt threads back to the default cpuset.
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.Pp
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Non-sleepable locks such as mutexes should not be held across calls to these
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functions.
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.Pp
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The
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.Fn bus_bind_intr
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function is a simple wrapper around
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.Fn BUS_BIND_INTR .
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.Pp
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Note that currently there is no attempt made to arbitrate between
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multiple bind requests for the same interrupt from either the same
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device or multiple devices.
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There is also no arbitration between interrupt binding requests submitted
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by userland via
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.Xr cpuset 2
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and
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.Fn BUS_BIND_INTR .
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The most recent binding request is the one that will be in effect.
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2009-10-14 16:00:20 +00:00
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.Sh RETURN VALUES
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Zero is returned on success, otherwise an appropriate error is returned.
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2009-10-14 15:58:59 +00:00
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.Sh SEE ALSO
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.Xr BUS_SETUP_INTR 9 ,
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.Xr cpuset 2 ,
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.Xr device 9
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.Sh HISTORY
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The
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.Fn BUS_BIND_INTR
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method and
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.Fn bus_bind_intr
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functions first appeared in
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.Fx 7.2 .
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