On Thursday, June 9, 2016 11:19:21 AM CEST Thomas Petazzoni wrote: > > What is the version of the GIC in the Armada 3700? If you have GICv3 > > or GICv2m, could you use that instead of the built-in MSI logic? > > > > We typically handle this using the msi-map or msi-parent properties > > pointing to either the gic or the PCI host, depending on which one > > you want to use, but either of them should work, and the GIC should > > be more efficient because you can distribute the interrupts of the > > PCI devices over all CPUs by workload, rather than having to > > multiplex all MSI through a single GIC interrupt. > > There is a GIC-500, but Marcin told me that attempts to use MSI with it > have not been successful so far. There will be investigation on this > topic in the future, but for the moment, we'd like to have the MSI > functionality built into the PCIe driver supported. We can migrate > later to GIC-500 powered MSIs once working. I think you should still add the msi-parent or msi-map properties then, just have them point at the PCI host node instead of the GIC-500, and evaluate that to get the built-in controller. Arnd -- 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