Where PCI slot number comes from? How the OS finds this?

Solution Verified - Updated -

Issue

The OS may report slot number of PCI device. It can be read using lspci command or reported in files/directories under /sys/bus/pci/slots/.
Where this PCI slot id number comes from on ACPI-based systems?

Environment

  • Red Hat Enterprise Linux 8
  • ACPI-based system

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