1.\" -*- nroff -*-
2.\"
3.\" Copyright (c) 2011 Hudson River Trading LLC
4.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
5.\" All rights reserved.
6.\"
7.\" Redistribution and use in source and binary forms, with or without
8.\" modification, are permitted provided that the following conditions
9.\" are met:
10.\" 1. Redistributions of source code must retain the above copyright
11.\"    notice, this list of conditions and the following disclaimer.
12.\" 2. Redistributions in binary form must reproduce the above copyright
13.\"    notice, this list of conditions and the following disclaimer in the
14.\"    documentation and/or other materials provided with the distribution.
15.\"
16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26.\" SUCH DAMAGE.
27.\"
28.Dd April 23, 2016
29.Dt BUS_ADJUST_RESOURCE 9
30.Os
31.Sh NAME
32.Nm bus_adjust_resource
33.Nd adjust resource allocated from a parent bus
34.Sh SYNOPSIS
35.In sys/param.h
36.In sys/bus.h
37.Pp
38.In machine/bus.h
39.In sys/rman.h
40.In machine/resource.h
41.Ft int
42.Fo bus_adjust_resource
43.Fa "device_t dev" "int type" "struct resource *r"
44.Fa "rman_res_t start" "rman_res_t end"
45.Fc
46.Sh DESCRIPTION
47This function is used to ask the parent bus to adjust the resource range
48assigned to an allocated resource.
49The resource
50.Fa r
51should have been allocated by a previous call to
52.Xr bus_alloc_resource 9 .
53The new resource range must overlap the existing range of
54.Fa r .
55The
56.Fa type
57argument should match the
58.Fa type
59argument passed to
60.Xr bus_alloc_resource 9
61when the resource was initially allocated.
62.Pp
63Note that none of the constraints of the original allocation request such
64as alignment or boundary restrictions are checked by
65.Fn bus_adjust_resource .
66It is the caller's responsibility to enforce any such requirements.
67.Sh RETURN VALUES
68The
69.Fn bus_adjust_resource
70method returns zero on success or an error code on failure.
71.Sh EXAMPLES
72Grow an existing memory resource by 4096 bytes.
73.Bd -literal
74	struct resource *res;
75	int error;
76
77	error = bus_adjust_resource(dev, SYS_RES_MEMORY, res,
78	    rman_get_start(res), rman_get_end(res) + 0x1000);
79.Ed
80.Sh ERRORS
81.Fn bus_adjust_resource
82will fail if:
83.Bl -tag -width Er
84.It Bq Er EINVAL
85The
86.Fa dev
87device does not have a parent device.
88.It Bq Er EINVAL
89The
90.Fa r
91resource is a shared resource.
92.It Bq Er EINVAL
93The new address range does not overlap with the existing address range of
94.Fa r .
95.It Bq Er EBUSY
96The new address range conflicts with another allocated resource.
97.El
98.Sh SEE ALSO
99.Xr bus_alloc_resource 9 ,
100.Xr bus_release_resource 9 ,
101.Xr device 9 ,
102.Xr driver 9
103