cc981af204
Add a pair of bus methods that can be used to "map" resources for direct CPU access using bus_space(9). bus_map_resource() creates a mapping and bus_unmap_resource() releases a previously created mapping. Mappings are described by 'struct resource_map' object. Pointers to these objects can be passed as the first argument to the bus_space wrapper API used for bus resources. Drivers that wish to map all of a resource using default settings (for example, using uncacheable memory attributes) do not need to change. However, drivers that wish to use non-default settings can now do so without jumping through hoops. First, an RF_UNMAPPED flag is added to request that a resource is not implicitly mapped with the default settings when it is activated. This permits other activation steps (such as enabling I/O or memory decoding in a device's PCI command register) to be taken without creating a mapping. Right now the AGP drivers don't set RF_ACTIVE to avoid using up a large amount of KVA to map the AGP aperture on 32-bit platforms. Once RF_UNMAPPED is supported on all platforms that support AGP this can be changed to using RF_UNMAPPED with RF_ACTIVE instead. Second, bus_map_resource accepts an optional structure that defines additional settings for a given mapping. For example, a driver can now request to map only a subset of a resource instead of the entire range. The AGP driver could also use this to only map the first page of the aperture (IIRC, it calls pmap_mapdev() directly to map the first page currently). I will also eventually change the PCI-PCI bridge driver to request mappings of the subset of the I/O window resource on its parent side to create mappings for child devices rather than passing child resources directly up to nexus to be mapped. This also permits bridges that do address translation to request suitable mappings from a resource on the "upper" side of the bus when mapping resources on the "lower" side of the bus. Another attribute that can be specified is an alternate memory attribute for memory-mapped resources. This can be used to request a Write-Combining mapping of a PCI BAR in an MI fashion. (Currently the drivers that do this call pmap_change_attr() directly for x86 only.) Note that this commit only adds the MI framework. Each platform needs to add support for handling RF_UNMAPPED and thew new bus_map/unmap_resource methods. Generally speaking, any drivers that are calling rman_set_bustag() and rman_set_bushandle() need to be updated. Discussed on: arch Reviewed by: cem Differential Revision: https://reviews.freebsd.org/D5237
151 lines
4.4 KiB
Groff
151 lines
4.4 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2003 M. Warner Losh
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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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 DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 20, 2016
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.Dt BUS_ACTIVATE_RESOURCE 9
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.Os
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.Sh NAME
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.Nm bus_activate_resource , bus_deactivate_resource
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.Nd activate or deactivate a resource
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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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.Fo bus_activate_resource
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.Fa "device_t dev" "int type" "int rid" "struct resource *r"
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.Fc
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.Ft int
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.Fo bus_deactivate_resource
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.Fa "device_t dev" "int type" "int rid" "struct resource *r"
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.Fc
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.Sh DESCRIPTION
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These functions activate or deactivate a previously allocated resource.
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In general, resources must be activated before they can be accessed by
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the driver.
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Bus drivers may perform additional actions to ensure that the resource is
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ready to be accessed.
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For example,
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the PCI bus driver enables memory decoding in a PCI device's command register
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when activating a memory resource.
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.Pp
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The arguments are as follows:
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.Bl -tag -width indent
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.It Fa dev
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The device that requests ownership of the resource.
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Before allocation, the resource is owned by the parent bus.
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.It Fa type
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The type of resource you want to allocate.
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It is one of:
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.Pp
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.Bl -tag -width ".Dv SYS_RES_MEMORY" -compact
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.It Dv PCI_RES_BUS
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for PCI bus numbers
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.It Dv SYS_RES_IRQ
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for IRQs
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.It Dv SYS_RES_DRQ
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for ISA DMA lines
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.It Dv SYS_RES_IOPORT
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for I/O ports
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.It Dv SYS_RES_MEMORY
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for I/O memory
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.El
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.It Fa rid
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A pointer to a bus specific handle that identifies the resource being allocated.
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.It Fa r
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A pointer to the
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.Vt "struct resource"
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returned by
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.Xr bus_alloc_resource 9 .
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.El
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.Ss Resource Mapping
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Resources which can be mapped for CPU access by a
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.Xr bus_space 9
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tag and handle will create a mapping of the entire resource when activated.
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The tag and handle for this mapping are stored in
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.Fa r
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and can be retrieved via
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.Xr rman_get_bustag 9
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and
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.Xr rman_get_bushandle 9 .
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These can be used with the
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.Xr bus_space 9
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API to access device registers or memory described by
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.Fa r .
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If the mapping is associated with a virtual address,
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the virtual address can be retrieved via
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.Xr rman_get_virtual 9 .
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.Pp
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This implicit mapping can be disabled by passing the
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.Dv RF_UNMAPPED
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flag to
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.Xr bus_alloc_resource 9 .
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A driver may use this if it wishes to allocate its own mappings of a resource
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using
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.Xr bus_map_resource 9 .
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.Pp
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A wrapper API for
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.Xr bus_space 9
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is also provided that accepts the associated resource as the first argument
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in place of the
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.Xr bus_space 9
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tag and handle.
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The functions in this wrapper API are named similarly to the
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.Xr bus_space 9
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API except that
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.Dq _space
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is removed from their name.
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For example,
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.Fn bus_read_4
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can be used in place of
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.Fn bus_space_read_4 .
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The wrapper API is preferred in new drivers.
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.Pp
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These two statements both read a 32-bit register at the start of a
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resource:
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.Bd -literal
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bus_space_read_4(rman_get_bustag(res), rman_get_bushandle(res), 0);
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bus_read_4(res, 0);
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.Ed
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.Sh RETURN VALUES
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Zero is returned on success, otherwise an error is returned.
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.Sh SEE ALSO
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.Xr bus_alloc_resource 9 ,
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.Xr bus_map_resource 9 ,
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.Xr bus_space 9 ,
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.Xr device 9 ,
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.Xr driver 9
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.Sh AUTHORS
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This manual page was written by
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.An Warner Losh Aq Mt imp@FreeBSD.org .
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