On Thu, Jan 05, 2023 at 09:49:44PM +0000, Luck, Tony wrote: > > The EDAC driver wouldn't have any ACPI stuff in it; it's just that > > Linux is looking for ACPI info about the ECAM area. > > Is there some way for a driver to know that pci_read_config_dword() > is going to fail for offsets in extended PCIe config space? There's no nice way to know ahead of time. "raw_pci_ext_ops == &pci_mmcfg" means it should work. It looks like pci_direct_conf1 and pci_mmcfg_numachip would also work, but it's all pretty ugly. You could check the result for PCI_POSSIBLE_ERROR(), since reads should return ~0 (PCI_ERROR_RESPONSE) if they fail either because we can't access extended config space or because there was some PCI error. Bjorn
