ubuntu下如何查看pcie设备m.2 ssd固态硬盘的VID，PID和识别的速度，lane数目

root@sta:~# dmidecode |grep -i pci
                PCI is supported
        Internal Reference Designator: J9C1 - PCIE DOCKING CONN
        Type: x16 PCI Express 3 x16
        Type: x16 PCI Express 3 x16
        Type: x16 PCI Express 3 x16
        Type: x16 PCI Express 3 x16
        Type: x8 PCI Express 3 x8
        Type: x8 PCI Express 3 x8
        Type: x4 PCI Express 3 x4
        Type: x16 PCI Express 3 x16
        Type: x16 PCI Express 3 x16
        Type: x16 PCI Express 3 x16
        Type: x16 PCI Express 3 x16
Invalid entry length (16). Fixed up to 11.
        Descriptor 9: PCI parity error
        Descriptor 10: PCI system error
root@sta:~#

查看m.2固态硬盘的连接速度：

root@sta:~# lspci|grep -i ssd
0f:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983
root@sta:~# lspci -n|grep -i 0f:00.0 
0f:00.0 0108: 144d:a808
root@sta:~# lspci -n -d 144d:a808 -vvv|grep -i width
                LnkCap: Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L1 <64us
                LnkSta: Speed 5GT/s (downgraded), Width x4 (ok)
root@sta:~#

一行命令搞定：

root@sta:~# x=`lspci|grep -i ssd|awk '{print $1}'`;y=`lspci -n|grep -i $x|awk '{print $3}'`;lspci -n -d $y -vvv|grep -i width
                LnkCap: Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L1 <64us
                LnkSta: Speed 5GT/s (downgraded), Width x4 (ok)
root@sta:~#

LnkCap: Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L1 <64us 表示支持的速度

LnkSta: Speed 5GT/s (downgraded), Width x4 (ok)这是当前的速度,有downgraded说明降速了，可能是接口有问题。