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freebsd-nq/share/man/man9/BUS_DESCRIBE_INTR.9

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Add a facility for associating optional descriptions with active interrupt handlers. This is primarily intended as a way to allow devices that use multiple interrupts (e.g. MSI) to meaningfully distinguish the various interrupt handlers. - Add a new BUS_DESCRIBE_INTR() method to the bus interface to associate a description with an active interrupt handler setup by BUS_SETUP_INTR. It has a default method (bus_generic_describe_intr()) which simply passes the request up to the parent device. - Add a bus_describe_intr() wrapper around BUS_DESCRIBE_INTR() that supports printf(9) style formatting using var args. - Reserve MAXCOMLEN bytes in the intr_handler structure to hold the name of an interrupt handler and copy the name passed to intr_event_add_handler() into that buffer instead of just saving the pointer to the name. - Add a new intr_event_describe_handler() which appends a description string to an interrupt handler's name. - Implement support for interrupt descriptions on amd64 and i386 by having the nexus(4) driver supply a custom bus_describe_intr method that invokes a new intr_describe() MD routine which in turn looks up the associated interrupt event and invokes intr_event_describe_handler(). Requested by: many Reviewed by: scottl MFC after: 2 weeks
2009-10-15 14:54:35 +00:00
.\" -*- nroff -*-
.\"
.\" Copyright (c) 2009 Advanced Computing Technologies LLC
.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
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.Dd October 14, 2009
.Dt BUS_DESCRIBE_INTR 9
.Os
.Sh NAME
.Nm BUS_DESCRIBE_INTR ,
.Nm bus_describe_intr
.Nd "associate a description with an active interrupt handler"
.Sh SYNOPSIS
.In sys/param.h
.In sys/bus.h
.Ft int
.Fo BUS_BIND_INTR
.Fa "device_t dev" "device_t child" "struct resource *irq" "void *cookie"
.Fa "const char *descr"
.Fc
.Ft int
.Fo bus_describe_intr
.Fa "device_t dev" "struct resource *irq" "void *cookie" "const char *fmt"
Remove trailing whitespace per mdoc lint warning Disussed with: gavin No objection from: doc Approved by: joel MFC after: 3 days
2012-03-29 05:02:12 +00:00
.Fa ...
Add a facility for associating optional descriptions with active interrupt handlers. This is primarily intended as a way to allow devices that use multiple interrupts (e.g. MSI) to meaningfully distinguish the various interrupt handlers. - Add a new BUS_DESCRIBE_INTR() method to the bus interface to associate a description with an active interrupt handler setup by BUS_SETUP_INTR. It has a default method (bus_generic_describe_intr()) which simply passes the request up to the parent device. - Add a bus_describe_intr() wrapper around BUS_DESCRIBE_INTR() that supports printf(9) style formatting using var args. - Reserve MAXCOMLEN bytes in the intr_handler structure to hold the name of an interrupt handler and copy the name passed to intr_event_add_handler() into that buffer instead of just saving the pointer to the name. - Add a new intr_event_describe_handler() which appends a description string to an interrupt handler's name. - Implement support for interrupt descriptions on amd64 and i386 by having the nexus(4) driver supply a custom bus_describe_intr method that invokes a new intr_describe() MD routine which in turn looks up the associated interrupt event and invokes intr_event_describe_handler(). Requested by: many Reviewed by: scottl MFC after: 2 weeks
2009-10-15 14:54:35 +00:00
.Fc
.Sh DESCRIPTION
The
.Fn BUS_DESCRIBE_INTR
method associates a description with an active interrupt handler.
The
.Fa cookie
parameter must be the value returned by a successful call to
.Xr BUS_SETUP_INTR 9
for the interrupt
.Fa irq .
.Pp
The
.Fn bus_describe_intr
function is a simple wrapper around
.Fn BUS_DESCRIBE_INTR .
As a convenience,
.Fn bus_describe_intr
allows the caller to use
.Xr printf 9
style formatting to build the description string using
.Fa fmt .
.Pp
When an interrupt handler is established by
.Xr BUS_SETUP_INTR 9 ,
the handler is named after the device the handler is established for.
This name is then used in various places such as interrupt statistics
displayed by
.Xr systat 1
and
.Xr vmstat 8 .
For devices that use a single interrupt,
the device name is sufficiently unique to identify the interrupt handler.
However, for devices that use multiple interrupts it can be useful to
distinguish the interrupt handlers.
When a description is set for an active interrupt handler,
a colon followed by the description is appended to the device name to form
the interrupt handler name.
.Sh RETURN VALUES
Zero is returned on success, otherwise an appropriate error is returned.
.Sh SEE ALSO
.Xr BUS_SETUP_INTR 9 ,
.Xr systat 1 ,
Sort SEE ALSO.
2009-10-16 12:32:07 +00:00
.Xr vmstat 8 ,
.Xr device 9 ,
.Xr printf 9
Add a facility for associating optional descriptions with active interrupt handlers. This is primarily intended as a way to allow devices that use multiple interrupts (e.g. MSI) to meaningfully distinguish the various interrupt handlers. - Add a new BUS_DESCRIBE_INTR() method to the bus interface to associate a description with an active interrupt handler setup by BUS_SETUP_INTR. It has a default method (bus_generic_describe_intr()) which simply passes the request up to the parent device. - Add a bus_describe_intr() wrapper around BUS_DESCRIBE_INTR() that supports printf(9) style formatting using var args. - Reserve MAXCOMLEN bytes in the intr_handler structure to hold the name of an interrupt handler and copy the name passed to intr_event_add_handler() into that buffer instead of just saving the pointer to the name. - Add a new intr_event_describe_handler() which appends a description string to an interrupt handler's name. - Implement support for interrupt descriptions on amd64 and i386 by having the nexus(4) driver supply a custom bus_describe_intr method that invokes a new intr_describe() MD routine which in turn looks up the associated interrupt event and invokes intr_event_describe_handler(). Requested by: many Reviewed by: scottl MFC after: 2 weeks
2009-10-15 14:54:35 +00:00
.Sh HISTORY
The
.Fn BUS_DESCRIBE_INTR
method and
.Fn bus_describe_intr
functions first appeared in
These features will first appear in 8.1, soon to be released MFC after: 3 days
2010-05-24 11:14:40 +00:00
.Fx 8.1 .
Add a facility for associating optional descriptions with active interrupt handlers. This is primarily intended as a way to allow devices that use multiple interrupts (e.g. MSI) to meaningfully distinguish the various interrupt handlers. - Add a new BUS_DESCRIBE_INTR() method to the bus interface to associate a description with an active interrupt handler setup by BUS_SETUP_INTR. It has a default method (bus_generic_describe_intr()) which simply passes the request up to the parent device. - Add a bus_describe_intr() wrapper around BUS_DESCRIBE_INTR() that supports printf(9) style formatting using var args. - Reserve MAXCOMLEN bytes in the intr_handler structure to hold the name of an interrupt handler and copy the name passed to intr_event_add_handler() into that buffer instead of just saving the pointer to the name. - Add a new intr_event_describe_handler() which appends a description string to an interrupt handler's name. - Implement support for interrupt descriptions on amd64 and i386 by having the nexus(4) driver supply a custom bus_describe_intr method that invokes a new intr_describe() MD routine which in turn looks up the associated interrupt event and invokes intr_event_describe_handler(). Requested by: many Reviewed by: scottl MFC after: 2 weeks
2009-10-15 14:54:35 +00:00
.Sh BUGS
It is not currently possible to remove a description from an active interrupt
handler.
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