On Sat, Apr 17, 2021 at 01:04:30AM +0200, Pali Rohár wrote: > Above NVMe disk is connected to PCIe packet switch (which acts as pair > of Upstream and Downstream ports of PCI bridge) and PCIe packet switch > is connected to the Root port. > > I'm not sure what should I set or what to force. Try adding the suggested kernel parameter, "pci=pcie_bus_safe". Unless this is a hot-plug scenario, it is odd the OS was handed mismatched PCIe settings. That usually indicates a platform bios issue, and the kernel parameter is typically successful at working around it.
