New ACPI PCI Link Routing code

[John Baldwin]

On Thursday 11 November 2004 05:37 pm, John Baldwin wrote:
> I've done some work on the ACPI PCI link code to make it a bit more like
> $PIR in that it is link centric and uses actual new-bus devices for each
> device link.  One benefit of this is that unused links will be disabled now
> which might help with interrupt aliasing problems on machines using APICs. 
> Also, instead of routing IRQs for links via PCI device numbers using
> tunables, they are now routed via the link name ala $PIR.  Thus, one uses
> 'hw.pci.link.LNKA.irq=X' to route LNKA to IRQ X.  Also, when choosing a
> virgin interrupt, we no longer try to guess at which IRQs might be used by
> ISA devices.  Instead, we only use known-good IRQs including IRQs that the
> BIOS has already used and the SCI if the link is being routed via ISA IRQs.
> The patch is at http://www.FreeBSD.org/~jhb/patches/acpi_pci_link.patch
> Please test and let me know if there are any problems, thanks.

I've updated this to the latest current and verified that it compiles ok 
(since I had at least one report that it didn't patch cleanly and/or 
compile).  I plan to commit this in a couple of days unless I hear some sort 
of negative feedback.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org