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105 lines
3.3 KiB
Groff
105 lines
3.3 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2009 Hudson River Trading 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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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 9, 2015
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.Dt BUS_DESCRIBE_INTR 9
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.Os
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.Sh NAME
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.Nm BUS_DESCRIBE_INTR ,
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.Nm bus_describe_intr
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.Nd "associate a description with an active interrupt handler"
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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_DESCRIBE_INTR
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.Fa "device_t dev" "device_t child" "struct resource *irq" "void *cookie"
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.Fa "const char *descr"
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.Fc
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.Ft int
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.Fo bus_describe_intr
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.Fa "device_t dev" "struct resource *irq" "void *cookie" "const char *fmt"
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.Fa ...
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.Fc
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.Sh DESCRIPTION
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The
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.Fn BUS_DESCRIBE_INTR
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method associates a description with an active interrupt handler.
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The
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.Fa cookie
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parameter must be the value returned by a successful call to
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.Xr BUS_SETUP_INTR 9
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for the interrupt
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.Fa irq .
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.Pp
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The
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.Fn bus_describe_intr
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function is a simple wrapper around
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.Fn BUS_DESCRIBE_INTR .
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As a convenience,
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.Fn bus_describe_intr
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allows the caller to use
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.Xr printf 9
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style formatting to build the description string using
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.Fa fmt .
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.Pp
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When an interrupt handler is established by
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.Xr BUS_SETUP_INTR 9 ,
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the handler is named after the device the handler is established for.
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This name is then used in various places such as interrupt statistics
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displayed by
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.Xr systat 1
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and
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.Xr vmstat 8 .
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For devices that use a single interrupt,
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the device name is sufficiently unique to identify the interrupt handler.
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However, for devices that use multiple interrupts it can be useful to
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distinguish the interrupt handlers.
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When a description is set for an active interrupt handler,
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a colon followed by the description is appended to the device name to form
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the interrupt handler name.
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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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.Sh SEE ALSO
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.Xr systat 1 ,
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.Xr vmstat 8 ,
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.Xr BUS_SETUP_INTR 9 ,
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.Xr device 9 ,
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.Xr printf 9
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.Sh HISTORY
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The
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.Fn BUS_DESCRIBE_INTR
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method and
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.Fn bus_describe_intr
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functions first appeared in
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.Fx 8.1 .
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.Sh BUGS
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It is not currently possible to remove a description from an active interrupt
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handler.
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