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.
This commit is contained in:
parent
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=221231
@ -21,6 +21,7 @@ MAN= accept_filter.9 \
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BUF_UNLOCK.9 \
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BUF_UNLOCK.9 \
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bus_activate_resource.9 \
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bus_activate_resource.9 \
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BUS_ADD_CHILD.9 \
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BUS_ADD_CHILD.9 \
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bus_adjust_resource.9 \
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bus_alloc_resource.9 \
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bus_alloc_resource.9 \
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BUS_BIND_INTR.9 \
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BUS_BIND_INTR.9 \
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bus_child_present.9 \
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bus_child_present.9 \
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101
share/man/man9/bus_adjust_resource.9
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101
share/man/man9/bus_adjust_resource.9
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@ -0,0 +1,101 @@
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.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2011 Advanced Computing Technologies LLC
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.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 29, 2011
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.Dt BUS_ADJUST_RESOURCE 9
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.Os
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.Sh NAME
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.Nm bus_adjust_resource
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.Nd adjust resource allocated from a parent bus
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/bus.h
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.Pp
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.In machine/bus.h
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.In sys/rman.h
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.In machine/resource.h
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.Ft int
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.Fn bus_adjust_resource "device_t dev" "int type" "struct resource *r" "u_long start" "u_long end"
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.Sh DESCRIPTION
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This function is used to ask the parent bus to adjust the resource range
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assigned to an allocated resource.
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The resource
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.Fa r
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should have been allocated by a previous call to
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.Xr bus_alloc_resource 9 .
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The new resource range must overlap the existing range of
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.Fa r .
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The
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.Fa type
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argument should match the
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.Fa type
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argument passed to
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.Xr bus_alloc_resource 9
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when the resource was initially allocated.
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.Pp
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Note that none of the constraints of the original allocation request such
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as alignment or boundary restrictions are checked by
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.Fn bus_adjust_resource .
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It is the caller's responsibility to enforce any such requirements.
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.Sh RETURN VALUES
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The
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.Fn bus_adjust_resource
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method returns zero on success or an error code on failure.
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.Sh ERRORS
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.Fn bus_adjust_resource
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa dev
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device does not have a parent device.
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.It Bq Er EINVAL
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The
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.Fa r
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resource is a shared resource.
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.It Bq Er EINVAL
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The new address range does not overlap with the existing address range of
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.Fa r .
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.It Bq Er EBUSY
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The new address range conflicts with another allocated resource.
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.El
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.Sh EXAMPLES
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Grow an existing memory resource by 4096 bytes.
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.Bd -literal
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struct resource *res;
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int error;
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error = bus_adjust_resource(dev, SYS_RES_MEMORY, res,
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rman_get_start(res), rman_get_end(res) + 0x1000);
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.Ed
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.Sh SEE ALSO
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.Xr bus_alloc_resource 9 ,
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.Xr bus_release_resource 9 ,
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.Xr device 9 ,
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.Xr driver 9
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@ -171,6 +171,7 @@ should be saved in the softc of the device after these calls.
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.Ed
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.Ed
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.Sh SEE ALSO
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.Sh SEE ALSO
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.Xr bus_activate_resource 9 ,
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.Xr bus_activate_resource 9 ,
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.Xr bus_adjust_resource 9 ,
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.Xr bus_release_resource 9 ,
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.Xr bus_release_resource 9 ,
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.Xr device 9 ,
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.Xr device 9 ,
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.Xr driver 9
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.Xr driver 9
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@ -462,6 +462,7 @@ function returns a pointer to the device which reserved the resource
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.Fa r .
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.Fa r .
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.Sh SEE ALSO
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.Sh SEE ALSO
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.Xr bus_activate_resource 9 ,
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.Xr bus_activate_resource 9 ,
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.Xr bus_adjust_resource 9 ,
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.Xr bus_alloc_resource 9 ,
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.Xr bus_alloc_resource 9 ,
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.Xr bus_release_resource 9 ,
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.Xr bus_release_resource 9 ,
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.Xr bus_set_resource 9 ,
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.Xr bus_set_resource 9 ,
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@ -296,6 +296,30 @@ METHOD int deactivate_resource {
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struct resource *_r;
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struct resource *_r;
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};
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};
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/**
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* @brief Adjust a resource
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*
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* Adjust the start and/or end of a resource allocated by
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* BUS_ALLOC_RESOURCE. At least part of the new address range must overlap
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* with the existing address range. If the successful, the resource's range
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* will be adjusted to [start, end] on return.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which allocated the resource
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* @param _type the type of resource
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* @param _res the resource to adjust
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* @param _start the new starting address of the resource range
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* @param _end the new ending address of the resource range
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*/
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METHOD int adjust_resource {
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device_t _dev;
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device_t _child;
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int _type;
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struct resource *_res;
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u_long _start;
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u_long _end;
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};
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/**
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/**
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* @brief Release a resource
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* @brief Release a resource
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*
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*
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@ -3645,6 +3645,23 @@ bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq,
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return (EINVAL);
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return (EINVAL);
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}
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}
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/**
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* @brief Helper function for implementing BUS_ADJUST_RESOURCE().
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*
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* This simple implementation of BUS_ADJUST_RESOURCE() simply calls the
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* BUS_ADJUST_RESOURCE() method of the parent of @p dev.
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*/
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int
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bus_generic_adjust_resource(device_t dev, device_t child, int type,
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struct resource *r, u_long start, u_long end)
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{
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/* Propagate up the bus hierarchy until someone handles it. */
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if (dev->parent)
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return (BUS_ADJUST_RESOURCE(dev->parent, child, type, r, start,
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end));
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return (EINVAL);
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}
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/**
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/**
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* @brief Helper function for implementing BUS_ALLOC_RESOURCE().
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* @brief Helper function for implementing BUS_ALLOC_RESOURCE().
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*
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*
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@ -3975,6 +3992,21 @@ bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end,
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count, flags));
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count, flags));
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}
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}
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/**
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* @brief Wrapper function for BUS_ADJUST_RESOURCE().
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*
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* This function simply calls the BUS_ADJUST_RESOURCE() method of the
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* parent of @p dev.
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*/
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int
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bus_adjust_resource(device_t dev, int type, struct resource *r, u_long start,
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u_long end)
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{
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if (dev->parent == NULL)
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return (EINVAL);
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return (BUS_ADJUST_RESOURCE(dev->parent, dev, type, r, start, end));
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}
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/**
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/**
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* @brief Wrapper function for BUS_ACTIVATE_RESOURCE().
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* @brief Wrapper function for BUS_ACTIVATE_RESOURCE().
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*
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*
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device_t
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device_t
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bus_generic_add_child(device_t dev, u_int order, const char *name,
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bus_generic_add_child(device_t dev, u_int order, const char *name,
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int unit);
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int unit);
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int bus_generic_adjust_resource(device_t bus, device_t child, int type,
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struct resource *r, u_long start,
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u_long end);
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struct resource *
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struct resource *
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bus_generic_alloc_resource(device_t bus, device_t child, int type,
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bus_generic_alloc_resource(device_t bus, device_t child, int type,
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int *rid, u_long start, u_long end,
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int *rid, u_long start, u_long end,
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@ -374,6 +377,8 @@ int bus_alloc_resources(device_t dev, struct resource_spec *rs,
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void bus_release_resources(device_t dev, const struct resource_spec *rs,
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void bus_release_resources(device_t dev, const struct resource_spec *rs,
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struct resource **res);
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struct resource **res);
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int bus_adjust_resource(device_t child, int type, struct resource *r,
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u_long start, u_long end);
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struct resource *bus_alloc_resource(device_t dev, int type, int *rid,
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struct resource *bus_alloc_resource(device_t dev, int type, int *rid,
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u_long start, u_long end, u_long count,
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u_long start, u_long end, u_long count,
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u_int flags);
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u_int flags);
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