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

On Wednesday, February 12, 2014 03:09:53 PM Marcel Moolenaar wrote:
> On Feb 12, 2014, at 11:25 AM, John Baldwin <[email protected]> wrote:
> > 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.
> 
> I'll give it a spin. Altix 350 & Altix 450 have non-standard PCI
> host controllers, which I do want to test. The firmware does not
> dictate bus numbers, so it may be a non-issue.

You will need the rman bits regardless as pci(4) will expect to be able to
allocate a bus resource.  For Host-PCI bridge drivers you need to handle
PCI_RES_BUS in bus_alloc_resource(), bus_adjust_resource(), and
bus_release_resource().  Mostly you just need to call the pci_domain
functions passing in the domain the bridge belongs to.

-- 
John Baldwin
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