Bug? PCI link device _SRS

[John Baldwin]

On Thursday 27 May 2004 04:55 pm, Brown, Len wrote:
> John,
> Dunno if FreeBSD works the same way,
> but we recently fixed a couple of interesting
> platform isssue using PCI Interrupt Links
> on Linux.
>
> 1. The enabled bit from _STA for
>    PCI Interrupt Link devices is meaningless
>    on many platforms, ignore it.

Ok, thanks.

>    If a platform gives you a _CRS IRQ that
>    is outside the _PRS list, then do no
>    stick with the _CRS -- select
>    a new (valid) one from the _PRS list.

Ah, I have a patch to do this already that I can commit.

>    If a platform gives you a _CRS IRQ that
>    is different from the _SRS you just
>    invoked.  Assume that the _SRS worked
>    and that the _CRS is bogus.

Huh, we don't do that type of checking, but we do use _CRS for later devices 
routed to the same link to see what IRQ they should use.

> http://bugzilla.kernel.org/show_bug.cgi?id=1581
>
> 2. Blindly programming all PCI Interrupt Link Devices
> turns out to be a bad idea.  Instead, they should
> be programmed only when PCI devices using them are
> installed and enabled in the system.
> http://bugzilla.kernel.org/show_bug.cgi?id=2574

Yes, we already do this as well.

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