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From: John Baldwin <jhb@freebsd.org>
To: ia64@freebsd.org
Subject: Re: svn commit: r261790 - in head/sys: amd64/include dev/acpica
 dev/cardbus dev/pccbb dev/pci i386/include sparc64/pci x86/include x86/pci
 x86/x86
Date: Wed, 12 Feb 2014 14:25:48 -0500
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Cc: Marcel Moolenaar <marcel@freebsd.org>
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On Tuesday, February 11, 2014 11:30:38 pm John Baldwin wrote:
> Author: jhb
> Date: Wed Feb 12 04:30:37 2014
> New Revision: 261790
> URL: http://svnweb.freebsd.org/changeset/base/261790
> 
> Log:
>   Add support for managing PCI bus numbers.  As with BARs and PCI-PCI bridge
>   I/O windows, the default is to preserve the firmware-assigned resources.
>   PCI bus numbers are only managed if NEW_PCIB is enabled and the architecture
>   defines a PCI_RES_BUS resource type.
>   - Add a helper API to create top-level PCI bus resource managers for each
>     PCI domain/segment.  Host-PCI bridge drivers use this API to allocate
>     bus numbers from their associated domain.
>   - Change the PCI bus and CardBus drivers to allocate a bus resource for
>     their bus number from the parent PCI bridge device.
>   - Change the PCI-PCI and PCI-CardBus bridge drivers to allocate the
>     full range of bus numbers from secbus to subbus from their parent bridge.
>     The drivers also always program their primary bus register.  The bridge
>     drivers also support growing their bus range by extending the bus resource
>     and updating subbus to match the larger range.
>   - Add support for managing PCI bus resources to the Host-PCI bridge drivers
>     used for amd64 and i386 (acpi_pcib, mptable_pcib, legacy_pcib, and qpi_pcib).
>   - Define a PCI_RES_BUS resource type for amd64 and i386.

Since ia64 only uses ACPI Host-PCI bridges, I believe that this can be enabled
on ia64 by just adding an appropriate #define for PCI_RES_BUS to
<machine/bus.h>.  I just have no way to test it.

-- 
John Baldwin