Re: MSI support on Linux PCI implementation for Ocotea

Hi Ben,

Now, regarding MSI, as you have noticed, the situation isn't great. I'm
currently in the middle of reworking our interrupt management (and
interrupt numbers allocation layer) and Michael Ellermann is looking at
the MSI issue in parallel.

Just one point about MSI(-X) message address and data format. I think
it should be the platform that defines the content. Current
implementation doesn't have this flexibility. We have a design where
MSI mode uses message data to carry vector number info while MSI-X
mode uses message address to carry this info. Although it seems
strange, but I think it's allowed by the spec.

Thanks,
-Shawn.