How does lspci find out physical slot number of a PCI device?

slot cover to reveal special connectors or attachments for the expansion PCIe Without boring you, the PCI Express type of expansion slot

Types of PCIe Slots PCIe Lanes · PCIe x1: The smallest PCIe slot, which supports one lane of data transfer · PCIe x4: This slot supports four lanes of data

pcle x16 slot slot cover to reveal special connectors or attachments for the expansion PCIe Without boring you, the PCI Express type of expansion slot

pcle slot So, there is no singular PCI Express slot There are actually four sizes : PCI Express x1, PCI Express x4, PCI Express x8, and PCI Express x16