svn commit: r219737 - head/sys/dev/pci

[Nathan Whitehorn]

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.
-Nathan