svn commit: r219737 - head/sys/dev/pci
John Baldwin
jhb at freebsd.org
Fri Mar 18 14:02:38 UTC 2011
On Friday, March 18, 2011 8:48:28 am Nathan Whitehorn wrote:
> On 03/18/11 07:13, John Baldwin wrote:
> > Author: jhb
> > Date: Fri Mar 18 12:13:04 2011
> > New Revision: 219737
> > URL: http://svn.freebsd.org/changeset/base/219737
> >
> > Log:
> > Fix a few issues with HyperTransport devices and MSI interrupts:
> > - Always enable the HyperTransport MSI mapping window for HyperTransport
> > to PCI bridges (these show up as HyperTransport slave devices).
> > The mapping windows in PCI-PCI bridges are enabled by existing code
> > in the PCI-PCI bridge driver as MSI requests propagate up the device
> > tree, but Host-PCI bridges don't really show up in that tree.
> > - If the PCI device at domain 0 bus 0 slot 0 function 0 is not a
> > HyperTransport device, then blacklist MSI on any other HT devices in
> > the system. Linux has a similar quirk.
> >
>
> I think this last change only works on x86 systems. My powerpc desktop
> has hypertransport and MSI, but PCI bus 0 (the PCI-E bus with the
> graphics card in it) is not connected over hypertransport and has
> nothing to do with it. Also, the root host->HT bridge doesn't show up in
> PCI space at all.
Hmm, that is likely true. Rereading the Linux code, this last quirk only
applies to Nvidia chipsets. Bah, I also botched it, so I'll remove that part
for now. Only the first fix was needed for the PR.
--
John Baldwin
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