Hi, We are debugging an issue that skx_pci_uncores cannot be registered on 8-socket system with Xeon Platinum 8176 CPUs. After poking around for a while, I found it is caused by snbep_pci2phy_map_init() couldn't find a unbox_dev:
ubox_dev = pci_get_device(PCI_VENDOR_ID_INTEL, devid, ubox_dev); unbox_dev == NULL ... The same kernel (Linus' master) works fine on some single socket SKX systems. I am not sure what to check next. And I am not sure whether this is specific to this system (HPE Superdome Flex). One thing I noticed is that the PCI configuration space shows subsystem vendor ID of 0x1590 instead of 0x8086: 0000:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04) 00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 90 15 14 20 << subsystem vendor 30: 00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00 But I don't think that is the problem as the code search with PCI_ANY_ID. Any suggestions on what might be broken? And what to try next? Thanks in advance! Song
