318 lines
8.6 KiB
Groff
318 lines
8.6 KiB
Groff
.\"
|
|
.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.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 May 12, 2003
|
|
.Dt RMAN 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rman ,
|
|
.Nm rman_activate_resource ,
|
|
.Nm rman_await_resource ,
|
|
.Nm rman_deactivate_resource ,
|
|
.Nm rman_fini ,
|
|
.Nm rman_init ,
|
|
.Nm rman_manage_region ,
|
|
.Nm rman_release_resource ,
|
|
.Nm rman_reserve_resource ,
|
|
.Nm rman_reserve_resource_bound ,
|
|
.Nm rman_make_alignment_flags ,
|
|
.Nm rman_get_start ,
|
|
.Nm rman_get_end ,
|
|
.Nm rman_get_device ,
|
|
.Nm rman_get_size ,
|
|
.Nm rman_get_flags ,
|
|
.Nm rman_set_virtual ,
|
|
.Nm rman_get_virtual ,
|
|
.Nm rman_set_bustag ,
|
|
.Nm rman_get_bustag ,
|
|
.Nm rman_set_bushandle ,
|
|
.Nm rman_get_bushandle ,
|
|
.Nm rman_set_rid ,
|
|
.Nm rman_get_rid
|
|
.Nd resource management functions
|
|
.Sh SYNOPSIS
|
|
.In sys/rman.h
|
|
.Ft int
|
|
.Fn rman_activate_resource "struct resource *r"
|
|
.Ft int
|
|
.Fn rman_await_resource "struct resource *r" "int pri2" "int timo"
|
|
.Ft int
|
|
.Fn rman_deactivate_resource "struct resource *r"
|
|
.Ft int
|
|
.Fn rman_fini "struct rman *rm"
|
|
.Ft int
|
|
.Fn rman_init "struct rman *rm"
|
|
.Ft int
|
|
.Fn rman_manage_region "struct rman *rm" "u_long start" "u_long end"
|
|
.Ft int
|
|
.Fn rman_release_resource "struct resource *r"
|
|
.Ft "struct resource *"
|
|
.Fo rman_reserve_resource
|
|
.Fa "struct rman *rm" "u_long start" "u_long end" "u_long count"
|
|
.Fa "u_int flags" "struct device *dev"
|
|
.Fc
|
|
.Ft "struct resource *"
|
|
.Fo rman_reserve_resource_bound
|
|
.Fa "struct rman *rm" "u_long start" "u_long end" "u_long count"
|
|
.Fa "u_long bound" "u_int flags" "struct device *dev"
|
|
.Fc
|
|
.Ft uint32_t
|
|
.Fn rman_make_alignment_flags "uint32_t size"
|
|
.Ft u_long
|
|
.Fn rman_get_start "struct resource *r"
|
|
.Ft u_long
|
|
.Fn rman_get_end "struct resource *r"
|
|
.Ft "struct device *"
|
|
.Fn rman_get_device "struct resource *r"
|
|
.Ft u_long
|
|
.Fn rman_get_size "struct resource *r"
|
|
.Ft u_int
|
|
.Fn rman_get_flags "struct resource *r"
|
|
.Ft void
|
|
.Fn rman_set_virtual "struct resource *r" "void *v"
|
|
.Ft "void *"
|
|
.Fn rman_get_virtual "struct resource *r"
|
|
.Ft void
|
|
.Fn rman_set_bustag "struct resource *r" "bus_space_tag_t t"
|
|
.Ft bus_space_tag_t
|
|
.Fn rman_get_bustag "struct resource *r"
|
|
.Ft void
|
|
.Fn rman_set_bushandle "struct resource *r" "bus_space_handle_t h"
|
|
.Ft bus_space_handle_t
|
|
.Fn rman_get_bushandle "struct resource *r"
|
|
.Ft void
|
|
.Fn rman_set_rid "struct resource *r" "int rid"
|
|
.Ft int
|
|
.Fn rman_get_rid "struct resource *r"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
set of functions provides a flexible resource management abstraction.
|
|
It is used extensively by the bus management code.
|
|
It implements the abstractions of region and resource.
|
|
A region descriptor is used to manage a region; this could be memory or
|
|
some other form of bus space.
|
|
.Pp
|
|
Each region has a set of bounds.
|
|
Within these bounds, allocated segments may reside.
|
|
Each segment, termed a resource, has several properties which are
|
|
represented by a 16-bit flag register, as follows.
|
|
.Bd -literal
|
|
#define RF_ALLOCATED 0x0001 /* resource has been reserved */
|
|
#define RF_ACTIVE 0x0002 /* resource allocation has been activated */
|
|
#define RF_SHAREABLE 0x0004 /* resource permits contemporaneous sharing */
|
|
#define RF_TIMESHARE 0x0008 /* resource permits time-division sharing */
|
|
#define RF_WANTED 0x0010 /* somebody is waiting for this resource */
|
|
#define RF_FIRSTSHARE 0x0020 /* first in sharing list */
|
|
#define RF_PREFETCHABLE 0x0040 /* resource is prefetchable */
|
|
.Ed
|
|
.Pp
|
|
The remainder of the flag bits are used to represent the desired alignment
|
|
of the resource within the region.
|
|
.Pp
|
|
The
|
|
.Fn rman_init
|
|
function initializes the region descriptor, pointed to by the
|
|
.Fa rm
|
|
argument, for use with the resource management functions.
|
|
It also initializes any mutexes associated with the structure.
|
|
.Pp
|
|
The
|
|
.Fn rman_fini
|
|
function frees any structures associated with the structure
|
|
pointed to by the
|
|
.Fa rm
|
|
argument.
|
|
If any of the resources within the managed region have the
|
|
.Dv RF_ALLOCATED
|
|
flag set, it will return
|
|
.Er EBUSY ;
|
|
otherwise, any mutexes associated with the structure will be released
|
|
and destroyed, and the function will return 0.
|
|
.Pp
|
|
The
|
|
.Fn rman_manage_region
|
|
function establishes the concept of a region which is under
|
|
.Nm
|
|
control.
|
|
The
|
|
.Fa rman
|
|
argument points to the region descriptor.
|
|
The
|
|
.Fa start
|
|
and
|
|
.Fa end
|
|
arguments specify the bounds of the region.
|
|
.Pp
|
|
.Em NOTE :
|
|
This interface is not robust against programming errors which
|
|
add multiple copies of the same region.
|
|
.Pp
|
|
The
|
|
.Fn rman_reserve_resource_bound
|
|
function is where the bulk of the
|
|
.Nm
|
|
logic is located.
|
|
It attempts to reserve a contiguous range in the specified region
|
|
.Fa rm
|
|
for the use of the device
|
|
.Fa dev .
|
|
The caller can specify the
|
|
.Fa start
|
|
and
|
|
.Fa end
|
|
of an acceptable range, as well as
|
|
alignment, and the code will attempt to find a free segment which fits.
|
|
The default behavior is to allocate an exclusive segment, unless the
|
|
.Dv RF_SHAREABLE
|
|
or
|
|
.Dv RF_TIMESHARE
|
|
flags are set, in which case a shared
|
|
segment will be allocated.
|
|
If this shared segment already exists, the caller has its device
|
|
added to the list of consumers.
|
|
.Pp
|
|
The
|
|
.Fn rman_reserve_resource
|
|
function is used to reserve resources within a previously established region.
|
|
It is a simplified interface to
|
|
.Fn rman_reserve_resource_bound
|
|
which passes 0 for the
|
|
.Fa flags
|
|
argument.
|
|
.Pp
|
|
The
|
|
.Fn rman_make_alignment_flags
|
|
function returns the flag mask corresponding to the desired alignment
|
|
.Fa size .
|
|
This should be used when calling
|
|
.Fn rman_reserve_resource_bound .
|
|
.Pp
|
|
The
|
|
.Fn rman_release_resource
|
|
function releases the reserved resource
|
|
.Fa r .
|
|
It may attempt to merge adjacent free resources.
|
|
.Pp
|
|
The
|
|
.Fn rman_activate_resource
|
|
function marks a resource as active, by setting the
|
|
.Dv RF_ACTIVE
|
|
flag.
|
|
If this is a time shared resource, and the caller has not yet acquired
|
|
the resource, the function returns
|
|
.Er EBUSY .
|
|
.Pp
|
|
The
|
|
.Fn rman_deactivate_resource
|
|
function marks a resource
|
|
.Fa r
|
|
as inactive, by clearing the
|
|
.Dv RF_ACTIVE
|
|
flag.
|
|
If other consumers are waiting for this range, it will wakeup their threads.
|
|
.Pp
|
|
The
|
|
.Fn rman_await_resource
|
|
function performs an asynchronous wait for a resource
|
|
.Fa r
|
|
to become inactive, that is, for the
|
|
.Dv RF_ACTIVE
|
|
flag to be cleared.
|
|
It is used to enable cooperative sharing of a resource
|
|
which can only be safely used by one thread at a time.
|
|
The arguments
|
|
.Fa pri
|
|
and
|
|
.Fa timo
|
|
are passed to the
|
|
.Fn rman_await_resource
|
|
function.
|
|
.Pp
|
|
The
|
|
.Fn rman_get_start ,
|
|
.Fn rman_get_end ,
|
|
.Fn rman_get_size ,
|
|
and
|
|
.Fn rman_get_flags
|
|
functions return the bounds, size and flags of the previously reserved
|
|
resource
|
|
.Fa r .
|
|
.Pp
|
|
The
|
|
.Fn rman_set_bustag
|
|
function associates a
|
|
.Vt bus_space_tag_t
|
|
.Fa t
|
|
with the resource
|
|
.Fa r .
|
|
The
|
|
.Fn rman_get_bustag
|
|
function is used to retrieve this tag once set.
|
|
.Pp
|
|
The
|
|
.Fn rman_set_bushandle
|
|
function associates a
|
|
.Vt bus_space_handle_t
|
|
.Fa h
|
|
with the resource
|
|
.Fa r .
|
|
The
|
|
.Fn rman_get_bushandle
|
|
function is used to retrieve this handle once set.
|
|
.Pp
|
|
The
|
|
.Fn rman_set_virtual
|
|
function is used to associate a kernel virtual address with a resource
|
|
.Fa r .
|
|
The
|
|
.Fn rman_get_virtual
|
|
function can be used to retrieve the KVA once set.
|
|
.Pp
|
|
The
|
|
.Fn rman_set_rid
|
|
function associates a resource identifier with a resource
|
|
.Fa r .
|
|
The
|
|
.Fn rman_get_rid
|
|
function retrieves this RID.
|
|
.Pp
|
|
The
|
|
.Fn rman_get_device
|
|
function returns a pointer to the device which reserved the resource
|
|
.Fa r .
|
|
.Pp
|
|
.Sh SEE ALSO
|
|
.Xr bus_activate_resource 9 ,
|
|
.Xr bus_alloc_resource 9 ,
|
|
.Xr bus_release_resource 9 ,
|
|
.Xr bus_set_resource 9 ,
|
|
.Xr mutex 9
|
|
.Sh AUTHORS
|
|
This man page was written by
|
|
.An Bruce M Simpson Aq bms@spc.org .
|