New ACPI PCI Link Routing code

[Nate Lawson]

John Baldwin wrote:
> 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.

I think it's ok to commit, modulo Andrew's panic.  I hope it generates 
enough debugging info so that we can quickly fix things in -current as 
reports arise.

Thanks for working on this,
-- 
Nate