Messages in this thread | | | Date | Thu, 5 Jan 2023 16:20:31 -0600 | From | Bjorn Helgaas <> | Subject | Re: Bug report: the extended PCI config space is missed with 6.2-rc2 |
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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
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