f3011a7c10
is the highest acceptable value for the ending of the resource being allocated. One could also believe that it is the highest starting value of the resource. The code definitely expects the former, but I could find no documentation of this apart from TFSC.
329 lines
8.8 KiB
Groff
329 lines
8.8 KiB
Groff
.\"
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.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.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 May 12, 2003
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.Dt RMAN 9
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.Os
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.Sh NAME
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.Nm rman ,
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.Nm rman_activate_resource ,
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.Nm rman_await_resource ,
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.Nm rman_deactivate_resource ,
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.Nm rman_fini ,
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.Nm rman_init ,
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.Nm rman_manage_region ,
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.Nm rman_release_resource ,
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.Nm rman_reserve_resource ,
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.Nm rman_reserve_resource_bound ,
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.Nm rman_make_alignment_flags ,
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.Nm rman_get_start ,
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.Nm rman_get_end ,
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.Nm rman_get_device ,
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.Nm rman_get_size ,
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.Nm rman_get_flags ,
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.Nm rman_set_virtual ,
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.Nm rman_get_virtual ,
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.Nm rman_set_bustag ,
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.Nm rman_get_bustag ,
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.Nm rman_set_bushandle ,
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.Nm rman_get_bushandle ,
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.Nm rman_set_rid ,
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.Nm rman_get_rid
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.Nd resource management functions
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.Sh SYNOPSIS
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.In sys/rman.h
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.Ft int
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.Fn rman_activate_resource "struct resource *r"
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.Ft int
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.Fn rman_await_resource "struct resource *r" "int pri2" "int timo"
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.Ft int
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.Fn rman_deactivate_resource "struct resource *r"
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.Ft int
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.Fn rman_fini "struct rman *rm"
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.Ft int
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.Fn rman_init "struct rman *rm"
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.Ft int
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.Fn rman_manage_region "struct rman *rm" "u_long start" "u_long end"
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.Ft int
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.Fn rman_release_resource "struct resource *r"
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.Ft "struct resource *"
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.Fo rman_reserve_resource
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.Fa "struct rman *rm" "u_long start" "u_long end" "u_long count"
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.Fa "u_int flags" "struct device *dev"
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.Fc
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.Ft "struct resource *"
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.Fo rman_reserve_resource_bound
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.Fa "struct rman *rm" "u_long start" "u_long end" "u_long count"
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.Fa "u_long bound" "u_int flags" "struct device *dev"
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.Fc
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.Ft uint32_t
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.Fn rman_make_alignment_flags "uint32_t size"
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.Ft u_long
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.Fn rman_get_start "struct resource *r"
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.Ft u_long
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.Fn rman_get_end "struct resource *r"
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.Ft "struct device *"
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.Fn rman_get_device "struct resource *r"
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.Ft u_long
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.Fn rman_get_size "struct resource *r"
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.Ft u_int
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.Fn rman_get_flags "struct resource *r"
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.Ft void
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.Fn rman_set_virtual "struct resource *r" "void *v"
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.Ft "void *"
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.Fn rman_get_virtual "struct resource *r"
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.Ft void
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.Fn rman_set_bustag "struct resource *r" "bus_space_tag_t t"
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.Ft bus_space_tag_t
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.Fn rman_get_bustag "struct resource *r"
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.Ft void
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.Fn rman_set_bushandle "struct resource *r" "bus_space_handle_t h"
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.Ft bus_space_handle_t
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.Fn rman_get_bushandle "struct resource *r"
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.Ft void
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.Fn rman_set_rid "struct resource *r" "int rid"
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.Ft int
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.Fn rman_get_rid "struct resource *r"
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.Sh DESCRIPTION
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The
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.Nm
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set of functions provides a flexible resource management abstraction.
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It is used extensively by the bus management code.
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It implements the abstractions of region and resource.
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A region descriptor is used to manage a region; this could be memory or
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some other form of bus space.
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.Pp
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Each region has a set of bounds.
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Within these bounds, allocated segments may reside.
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Each segment, termed a resource, has several properties which are
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represented by a 16-bit flag register, as follows.
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.Bd -literal
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#define RF_ALLOCATED 0x0001 /* resource has been reserved */
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#define RF_ACTIVE 0x0002 /* resource allocation has been activated */
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#define RF_SHAREABLE 0x0004 /* resource permits contemporaneous sharing */
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#define RF_TIMESHARE 0x0008 /* resource permits time-division sharing */
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#define RF_WANTED 0x0010 /* somebody is waiting for this resource */
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#define RF_FIRSTSHARE 0x0020 /* first in sharing list */
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#define RF_PREFETCHABLE 0x0040 /* resource is prefetchable */
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.Ed
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.Pp
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The remainder of the flag bits are used to represent the desired alignment
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of the resource within the region.
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.Pp
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The
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.Fn rman_init
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function initializes the region descriptor, pointed to by the
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.Fa rm
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argument, for use with the resource management functions.
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It also initializes any mutexes associated with the structure.
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.Pp
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The
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.Fn rman_fini
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function frees any structures associated with the structure
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pointed to by the
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.Fa rm
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argument.
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If any of the resources within the managed region have the
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.Dv RF_ALLOCATED
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flag set, it will return
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.Er EBUSY ;
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otherwise, any mutexes associated with the structure will be released
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and destroyed, and the function will return 0.
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.Pp
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The
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.Fn rman_manage_region
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function establishes the concept of a region which is under
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.Nm
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control.
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The
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.Fa rman
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argument points to the region descriptor.
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The
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.Fa start
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and
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.Fa end
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arguments specify the bounds of the region.
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.Pp
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.Em NOTE :
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This interface is not robust against programming errors which
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add multiple copies of the same region.
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.Pp
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The
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.Fn rman_reserve_resource_bound
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function is where the bulk of the
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.Nm
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logic is located.
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It attempts to reserve a contiguous range in the specified region
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.Fa rm
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for the use of the device
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.Fa dev .
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The caller can specify the
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.Fa start
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and
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.Fa end
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of an acceptable range, as well as
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alignment, and the code will attempt to find a free segment which fits.
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The
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.Fa start
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argument is the lowest acceptable starting value of the resource.
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The
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.Fa end
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argument is the highest acceptable ending value of the resource.
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Therefore,
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.Fa start + count - 1
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must be <=
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.Fa end
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for any allocation to happen.
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The default behavior is to allocate an exclusive segment, unless the
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.Dv RF_SHAREABLE
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or
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.Dv RF_TIMESHARE
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flags are set, in which case a shared
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segment will be allocated.
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If this shared segment already exists, the caller has its device
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added to the list of consumers.
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.Pp
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The
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.Fn rman_reserve_resource
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function is used to reserve resources within a previously established region.
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It is a simplified interface to
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.Fn rman_reserve_resource_bound
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which passes 0 for the
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.Fa flags
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argument.
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.Pp
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The
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.Fn rman_make_alignment_flags
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function returns the flag mask corresponding to the desired alignment
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.Fa size .
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This should be used when calling
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.Fn rman_reserve_resource_bound .
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.Pp
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The
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.Fn rman_release_resource
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function releases the reserved resource
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.Fa r .
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It may attempt to merge adjacent free resources.
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.Pp
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The
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.Fn rman_activate_resource
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function marks a resource as active, by setting the
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.Dv RF_ACTIVE
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flag.
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If this is a time shared resource, and the caller has not yet acquired
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the resource, the function returns
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.Er EBUSY .
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.Pp
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The
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.Fn rman_deactivate_resource
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function marks a resource
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.Fa r
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as inactive, by clearing the
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.Dv RF_ACTIVE
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flag.
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If other consumers are waiting for this range, it will wakeup their threads.
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.Pp
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The
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.Fn rman_await_resource
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function performs an asynchronous wait for a resource
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.Fa r
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to become inactive, that is, for the
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.Dv RF_ACTIVE
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flag to be cleared.
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It is used to enable cooperative sharing of a resource
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which can only be safely used by one thread at a time.
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The arguments
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.Fa pri
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and
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.Fa timo
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are passed to the
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.Fn rman_await_resource
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function.
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.Pp
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The
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.Fn rman_get_start ,
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.Fn rman_get_end ,
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.Fn rman_get_size ,
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and
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.Fn rman_get_flags
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functions return the bounds, size and flags of the previously reserved
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resource
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.Fa r .
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.Pp
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The
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.Fn rman_set_bustag
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function associates a
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.Vt bus_space_tag_t
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.Fa t
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with the resource
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.Fa r .
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The
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.Fn rman_get_bustag
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function is used to retrieve this tag once set.
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.Pp
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The
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.Fn rman_set_bushandle
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function associates a
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.Vt bus_space_handle_t
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.Fa h
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with the resource
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.Fa r .
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The
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.Fn rman_get_bushandle
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function is used to retrieve this handle once set.
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.Pp
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The
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.Fn rman_set_virtual
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function is used to associate a kernel virtual address with a resource
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.Fa r .
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The
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.Fn rman_get_virtual
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function can be used to retrieve the KVA once set.
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.Pp
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The
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.Fn rman_set_rid
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function associates a resource identifier with a resource
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.Fa r .
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The
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.Fn rman_get_rid
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function retrieves this RID.
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.Pp
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The
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.Fn rman_get_device
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function returns a pointer to the device which reserved the resource
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.Fa r .
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.Pp
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.Sh SEE ALSO
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.Xr bus_activate_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_set_resource 9 ,
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.Xr mutex 9
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.Sh AUTHORS
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This man page was written by
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.An Bruce M Simpson Aq bms@spc.org .
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