想获取DCU对应的理论上限和实际的代际和宽度，对应英伟达中pcie.link.gen.max,pcie.link.width.max,pcie.link.gen.current,pcie.link.width.current这四个参数，可以从`lspci -vv`命令中获取吗？比如下面的例子，LnkCap是否对应理论上限？LnkSta对应当前实际结果？ ```language 38:00.0 Display controller ... Capabilities: [64] Express (v2) Legacy Endpoint, MSI 00 ... LnkCap: Port #0, Speed 16GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+ ... LnkSta: Speed 16GT/s (ok), Width x16 (ok) TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- ... ``` 上面获取的代际和带宽就是最终结果了吗？是否需要结合拓扑树查询相关路径上PCIe Bridge、Switch、路径上对应端口的最小值？