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4.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
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30.Dd April 23, 2016
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.Fo bus_adjust_resource
45.Fa "device_t dev" "int type" "struct resource *r"
46.Fa "rman_res_t start" "rman_res_t end"
47.Fc
48.Sh DESCRIPTION
49This function is used to ask the parent bus to adjust the resource range
50assigned to an allocated resource.
51The resource
52.Fa r
53should have been allocated by a previous call to
54.Xr bus_alloc_resource 9 .
55The new resource range must overlap the existing range of
56.Fa r .
57The
58.Fa type
59argument should match the
60.Fa type
61argument passed to
62.Xr bus_alloc_resource 9
63when the resource was initially allocated.
64.Pp
65Note that none of the constraints of the original allocation request such
66as alignment or boundary restrictions are checked by
67.Fn bus_adjust_resource .
68It is the caller's responsibility to enforce any such requirements.
69.Sh RETURN VALUES
70The
71.Fn bus_adjust_resource
72method returns zero on success or an error code on failure.
73.Sh EXAMPLES
74Grow an existing memory resource by 4096 bytes.
75.Bd -literal
76	struct resource *res;
77	int error;
78
79	error = bus_adjust_resource(dev, SYS_RES_MEMORY, res,
80	    rman_get_start(res), rman_get_end(res) + 0x1000);
81.Ed
82.Sh ERRORS
83.Fn bus_adjust_resource
84will fail if:
85.Bl -tag -width Er
86.It Bq Er EINVAL
87The
88.Fa dev
89device does not have a parent device.
90.It Bq Er EINVAL
91The
92.Fa r
93resource is a shared resource.
94.It Bq Er EINVAL
95The new address range does not overlap with the existing address range of
96.Fa r .
97.It Bq Er EBUSY
98The new address range conflicts with another allocated resource.
99.El
100.Sh SEE ALSO
101.Xr bus_alloc_resource 9 ,
102.Xr bus_release_resource 9 ,
103.Xr device 9 ,
104.Xr driver 9
105