Linux kernel module that goes through each PCI device present (including PCIe) and shows the standard PCI configuration space information for each device on the file /proc/pcie_info

This is a nice small demo of how to create /proc entries and how to access PCI device information, including configuration space data.

Similar information can be obtained using lspci, but lspci will not show all the actual hex values for each configuration register; the raw configuration information of a known device (in the example below, device with PCI address 0000:00:16.0) can also be obtained doing:

/sys/bus/pci/devices/0000\:00\:16.0/config

but this approach requires knowing the device address, and one has to manually parse and flip the bytes of the configuration register values.

The make file works for Ubuntu 16.04 LTS, building the module may be different on other distros/versions. To use:

Build the module:

make

Insert the module in kernel:

make insert

Read PCIe configuration information:

cat /proc/pcie_info

Remove kernel module:

make remove