1、Downstream Port Containment (DPC)是PCIE4.0新增一个支持Device热插拔的功能，是不是只要RC端支持就可以了，以前的2.0，3.0的设备不需要什么处理就可以了？
2、Downstream Port Containment (DPC) is an optional normative feature of a Downstream Port.
DPC halts PCI Express traffic below a Downstream Port after an unmasked uncorrectable error is
30 detected at or below the Port, avoiding the potential spread of any data corruption, and permitting
error recovery if supported by software.