Add a new bus method, BUS_ADJUST_RESOURCE() that is intended to be a

wrapper around rman_adjust_resource().  Include a generic implementation,
bus_generic_adjust_resource() which passes the request up to the parent
bus.  There is currently no default implementation.  A
bus_adjust_resource() wrapper is provided for use in drivers.

4 files changed, 104 insertions, 0 deletions

diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
index 93814c6..8385c50 100644
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -21,6 +21,7 @@ MAN=	accept_filter.9 \
 	BUF_UNLOCK.9 \
 	bus_activate_resource.9 \
 	BUS_ADD_CHILD.9 \
+	bus_adjust_resource.9 \
 	bus_alloc_resource.9 \
 	BUS_BIND_INTR.9 \
 	bus_child_present.9 \
diff --git a/share/man/man9/bus_adjust_resource.9 b/share/man/man9/bus_adjust_resource.9
new file mode 100644
index 0000000..370c8fd
--- /dev/null
+++ b/share/man/man9/bus_adjust_resource.9
@@ -0,0 +1,101 @@
+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 2011 Advanced Computing Technologies LLC
+.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.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
+.In sys/param.h
+.In sys/bus.h
+.Pp
+.In machine/bus.h
+.In sys/rman.h
+.In 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.
+.Pp
+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:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa dev
+device does not have a parent device.
+.It Bq Er EINVAL
+The
+.Fa r
+resource is a shared resource.
+.It Bq Er EINVAL
+The new address range does not overlap with the existing address range of
+.Fa r .
+.It Bq Er EBUSY
+The new address range conflicts with another allocated resource.
+.El
+.Sh EXAMPLES
+Grow an existing memory resource by 4096 bytes.
+.Bd -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
diff --git a/share/man/man9/bus_alloc_resource.9 b/share/man/man9/bus_alloc_resource.9
index dd19627..388a7f3 100644
--- a/share/man/man9/bus_alloc_resource.9
+++ b/share/man/man9/bus_alloc_resource.9
@@ -171,6 +171,7 @@ should be saved in the softc of the device after these calls.
 .Ed
 .Sh SEE ALSO
 .Xr bus_activate_resource 9 ,
+.Xr bus_adjust_resource 9 ,
 .Xr bus_release_resource 9 ,
 .Xr device 9 ,
 .Xr driver 9
diff --git a/share/man/man9/rman.9 b/share/man/man9/rman.9
index 7f8d889..d9a2092 100644
--- a/share/man/man9/rman.9
+++ b/share/man/man9/rman.9
@@ -462,6 +462,7 @@ function returns a pointer to the device which reserved the resource
 .Fa r .
 .Sh SEE ALSO
 .Xr bus_activate_resource 9 ,
+.Xr bus_adjust_resource 9 ,
 .Xr bus_alloc_resource 9 ,
 .Xr bus_release_resource 9 ,
 .Xr bus_set_resource 9 ,