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.\" $FreeBSD$ 29.\" 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