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4.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
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28.\" $FreeBSD$
29.\"
30.Dd April 29, 2011
31.Dt BUS_ADJUST_RESOURCE 9
32.Os
33.Sh NAME
34.Nm bus_adjust_resource
35.Nd adjust resource allocated from a parent bus
36.Sh SYNOPSIS
37.In sys/param.h
38.In sys/bus.h
39.Pp
40.In machine/bus.h
41.In sys/rman.h
42.In machine/resource.h
43.Ft int
44.Fn bus_adjust_resource "device_t dev" "int type" "struct resource *r" "u_long start" "u_long end"
45.Sh DESCRIPTION
46This function is used to ask the parent bus to adjust the resource range
47assigned to an allocated resource.
48The resource
49.Fa r
50should have been allocated by a previous call to
51.Xr bus_alloc_resource 9 .
52The new resource range must overlap the existing range of
53.Fa r .
54The
55.Fa type
56argument should match the
57.Fa type
58argument passed to
59.Xr bus_alloc_resource 9
60when the resource was initially allocated.
61.Pp
62Note that none of the constraints of the original allocation request such
63as alignment or boundary restrictions are checked by
64.Fn bus_adjust_resource .
65It is the caller's responsibility to enforce any such requirements.
66.Sh RETURN VALUES
67The
68.Fn bus_adjust_resource
69method returns zero on success or an error code on failure.
70.Sh EXAMPLES
71Grow an existing memory resource by 4096 bytes.
72.Bd -literal
73	struct resource *res;
74	int error;
75
76	error = bus_adjust_resource(dev, SYS_RES_MEMORY, res,
77	    rman_get_start(res), rman_get_end(res) + 0x1000);
78.Ed
79.Sh ERRORS
80.Fn bus_adjust_resource
81will fail if:
82.Bl -tag -width Er
83.It Bq Er EINVAL
84The
85.Fa dev
86device does not have a parent device.
87.It Bq Er EINVAL
88The
89.Fa r
90resource is a shared resource.
91.It Bq Er EINVAL
92The new address range does not overlap with the existing address range of
93.Fa r .
94.It Bq Er EBUSY
95The new address range conflicts with another allocated resource.
96.El
97.Sh SEE ALSO
98.Xr bus_alloc_resource 9 ,
99.Xr bus_release_resource 9 ,
100.Xr device 9 ,
101.Xr driver 9
102