Method and device for expanding PCIe bus region

Abstract

An embodiment of the present invention relates to a method for expanding a PCIe bus region, capable of allocating configuration space address to a PCIe device of an expanded region from memory address of an endpoint device of a root complex, establishing a corresponding relationship between the configuration space address and bus number / device number / function number (BDF), and allocating a bus number to the PCIe device found in the expanded region from a second bus assembly of the expanded region, wherein the bus number is used for determining the BDF of the PCIe device found in the expanded region, so that a configuration space register of the PCIe device found in the expanded region can be accessed through the BDF of the PCIe device found in the expanded region according to the corresponding relationship between the configuration space address and the BDF, in this way, expansion of the PCIe bus region is achieved, and the problem that expansion of the PCIe bus region cannot be performed in the prior art is solved, thus the number of the PCIe devices in a system cannot be limited by 256 buses.

Description

technical field [0001] The embodiment of the present invention relates to computer technology, in particular to a method and device for extending a PCIe bus domain. Background technique [0002] Peripheral Component Interconnect Express (PCIe) bus technology is a high-performance bus technology used to interconnect processors and peripheral devices. PCIe bus adopts point-to-point serial connection, which can provide higher connection speed with fewer data lines than PCI bus, and is widely used in built-in devices of desktops, notebook computers, servers, communications and workstations, etc. [0003] A PCIe bus domain usually consists of a root complex (Root Complex), a switch (Switch), an endpoint (Endpoint) and a bridge (PCIe brige). The root complex is used for the connection between the processor and the input / output I / O devices, the switch supports peer-to-peer communication between different endpoints, and the bridge is used to connect PCIe with other PCI bus standard...

AI Technical Summary

Problems solved by technology

Therefore, in the existing PCIe bus domain system, the number of PCIe devices is limited by 256 buses

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