On Sat, May 10, 2014 at 09:03:11AM -0600, Alex Williamson wrote: > The expectation is that the kernel and IVRS will produce the same > result for topology based aliases while the kernel will also include > device specific DMA quirks. Is that expectation really true? There are PCIe devices out there that don't use their own device-id for requests but another one that isn't even visible as a PCI device (so the kernel has no pci_dev structure for it). The IVRS table contains such information, but I am not sure whether the PCI core finds the right requestor-id for those devices. I've seen this on PCIe cards that where the vendor just used an PCI-X chip with a PCIe-to-PCI-X bridge on the card. The PCI-X device is visible for the OS but uses the requestor-id of the invisible bridge. Joerg -- 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
