Re: [PATCH] [ACPI] Enable direct GSI mapping for APIC

[Marcelo Tosatti <mtosatti@redhat.com>]

On Fri, May 02, 2008 at 04:55:24PM +0200, Alexander Graf wrote:
> Hi,
> 
> in the DSDT there are two different ways of defining, how an interrupt 
> is supposed to be routed. Currently we are using the LNKA - LNKD method, 
> which afaict is for legacy support.
> The other method is to directly tell the Operating System, which APIC 
> pin the device is attached to. We can get that information from the very 
> same entry, the LNKA to LNKD pseudo devices receive it.
> 
> For now this does not give any obvious improvement. It does leave room 
> for more advanced mappings, with several IOAPICs that can handle more 
> devices separately. This might help when we have a lot of devices, as 
> currently all devices sit on two interrupt lanes.
> 
> More importantly (for me) though, is that Darwin enables the APIC mode 
> unconditionally, so it won't easily run in legacy mode.

Hi Alexander,

I'm just about to resend the patchset to add 3 PCI bridges, which
already adds the _SUN method appropriately. Please rebase the APRT patch
on top of that.

Thanks!

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