Copyright (c) 2011 Advanced Computing Technologies LLC
Written by: John H. Baldwin <jhb@FreeBSD.org>
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$FreeBSD: head/share/man/man9/bus_adjust_resource.9 221450 2011-05-04 18:16:05Z gjb $
.Dd April 29, 2011 .Dt BUS_ADJUST_RESOURCE 9 .Os .Sh NAME .Nm bus_adjust_resource .Nd adjust resource allocated from a parent bus .Sh SYNOPSIS n sys/param.h n sys/bus.h
p n machine/bus.h n sys/rman.h n machine/resource.h .Ft int .Fn bus_adjust_resource "device_t dev" "int type" "struct resource *r" "u_long start" "u_long end" .Sh DESCRIPTION This function is used to ask the parent bus to adjust the resource range assigned to an allocated resource. The resource .Fa r should have been allocated by a previous call to .Xr bus_alloc_resource 9 . The new resource range must overlap the existing range of .Fa r . The .Fa type argument should match the .Fa type argument passed to .Xr bus_alloc_resource 9 when the resource was initially allocated.
p Note that none of the constraints of the original allocation request such as alignment or boundary restrictions are checked by .Fn bus_adjust_resource . It is the caller's responsibility to enforce any such requirements. .Sh RETURN VALUES The .Fn bus_adjust_resource method returns zero on success or an error code on failure. .Sh ERRORS .Fn bus_adjust_resource will fail if: l -tag -width Er t Bq Er EINVAL The .Fa dev device does not have a parent device. t Bq Er EINVAL The .Fa r resource is a shared resource. t Bq Er EINVAL The new address range does not overlap with the existing address range of .Fa r . t Bq Er EBUSY The new address range conflicts with another allocated resource. .El .Sh EXAMPLES Grow an existing memory resource by 4096 bytes. d -literal struct resource *res; int error; error = bus_adjust_resource(dev, SYS_RES_MEMORY, res, rman_get_start(res), rman_get_end(res) + 0x1000); .Ed .Sh SEE ALSO .Xr bus_alloc_resource 9 , .Xr bus_release_resource 9 , .Xr device 9 , .Xr driver 9