Information handling system and method to detect and recover from spurious resets of pcie devices

Abstract

Embodiments of information handling systems (HSs) and computer-implemented methods are provided herein to detect and recover from spurious PCIe device resets. One embodiment of a disclosed method is performed by a host processor of an IHS that includes a plurality of Peripheral Component Interconnect Express (PCIe) devices, each including a set of PCIe configuration registers containing configuration settings for the PCIe device. The disclosed method includes generating, in response to the IHS transitioning from a lower power state to a higher power state, a PCIe device table containing the configuration settings stored within the set of PCIe configuration registers for each of the PCIe devices; determining, in response to detecting a system management interrupt (SMI), whether or not a spurious reset has occurred for at least one of the PCIe devices; and recovering the at least one PCIe device if said determining indicates that a spurious reset has occurred for the at least one PCIe device.