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[ Upstream commit 57bdeef4716689d9b0e3571034d65cf420f6efcd ] A config or MMIO read from a PCI device that doesn't exist or doesn't respond causes a PCI error. There's no real data to return to satisfy the CPU read, so most hardware fabricates ~0 data. Add a PCI_ERROR_RESPONSE definition for that and use it where appropriate to make these checks consistent and easier to find. Also add helper definitions PCI_SET_ERROR_RESPONSE() and PCI_POSSIBLE_ERROR() to make the code more readable. Suggested-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://lore.kernel.org/r/55563bf4dfc5d3fdc96695373c659d099bf175b1.1637243717.git.naveennaidu479@gmail.com Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Pali Rohár <pali@kernel.org> Stable-dep-of: c625dabbf1c4 ("x86/amd_nb: Check for invalid SMN reads") Signed-off-by: Sasha Levin <sashal@kernel.org> (cherry picked from commit 4c003aef56d5642aefd4d11ee9d7e6755d4c1a6e) Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>