| 摘要 |
Embodiments of the present invention relate to a method for extending a PCIe domain. A configuration space address can be allocated to a PCIe device in an extended domain from a memory address of a root complex endpoint device, a correspondence between the configuration space address and a bus number/device number/function number BDF can be established, and a bus number can be allocated from a second bus set of the extended domain to a PCIe device discovered in the extended domain, where the bus number is used for determining a BDF of the PCIe device discovered in the extended domain, so as to access, according to the correspondence between the configuration space address and the BDF and by using the BDF of the PCIe device discovered in the extended domain, a configuration space register of the PCIe device discovered in the extended domain, which implements extension of the PCIe domain, and solves a problem in the prior art that a PCIe domain cannot be extended, so that the number of PCIe devices in a system is not restricted by 256 buses. |
