On 04/11/15 13:34, Thomas Gleixner wrote: > Marc, > > On Fri, 16 Oct 2015, Marc Zyngier wrote: >> On 16/10/15 02:55, Jiang Liu wrote: >>> There's a working to enable Intel VMD storage device, which >>> has the similar requirement. Basically a PCIe hierarchy is hidden >>> behind a parent PCIe device, so we need to use the PCIe irqs on parent >>> to de-multiple PCIe IRQs from hidden PCIe devices. Seems a chance for >>> consolidation here. >> >> Do you know if there is a 1-1 mapping between the interrupts seen by the >> parent device and those seen by the hidden devices? Or is it a case of >> having to demultiplex the MSIs? Looks like the former, but I'd like to >> be sure. > > Yes, it's a demultiplexer. No 1:1 mapping. Right. This doesn't exactly fit the scheme I have so far (there is a 1:1 mapping between the wired interrupt and the MSI), but once we are able to expose an MSI domain, it could be possible to construct the MSI demultiplexer on top. That's a lot of layers! ;-) >> Sure, will do when I repost this (probably in a few weeks), and assuming >> this fits the bill for Thomas and the MBIGEN folks. > > It doesn't look that bad and the resulting mbigen stuff is way less > horrible than it was before. So I agree this is a possible solution to > the problem. Cool. I'll revisit that after the merge window. Thanks, M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
