Computing system, PCI device manager and initialization method thereof

A computing system, comprising:

• a host, wherein the host comprises a host memory, a host central processing unit (CPU) and a host bus;
• multiple peripheral component interconnect (PCI) devices, connected to the host bus;
• and
• a PCI device manager, connected to the host bus and used to realize peer-to-peer data transmission between the multiple PCI devices, comprising:
• a direct memory access (DMA) engine module connected to the host bus to realize data and command communication with the host and the multiple PCI devices through DMA;
• a device memory;
• a memory mapping module that maps a data cache space of the device memory to a physical address space of the host memory, so as to perform data communication and/or command communication with the multiple PCI devices via the DMA engine module in a running process;
• and a processor that sends a PCI device configuration instruction to the host through the DMA engine module and creates PCI device objects respectively for PCI devices discovered by the host, so as to realize data communication and/or command communication with the PCI devices through the PCI device objects in the running process;
• wherein data and command communication between the multiple PCI devices is implemented through the PCI device manager.