Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0/0000:04:00.0/0000:05:00.0/domain0/0-0/0-1/0-1.0/net/eth2':
    KERNEL=="eth2"
    SUBSYSTEM=="net"
    DRIVER==""
    ATTR{carrier_changes}=="1"
    ATTR{testing}=="0"
    ATTR{carrier}=="0"
    ATTR{dev_id}=="0x0"
    ATTR{carrier_down_count}=="1"
    ATTR{proto_down}=="0"
    ATTR{address}=="02:1f:1e:cf:86:86"
    ATTR{operstate}=="down"
    ATTR{link_mode}=="0"
    ATTR{dormant}=="0"
    ATTR{mtu}=="1500"
    ATTR{gro_flush_timeout}=="0"
    ATTR{carrier_up_count}=="0"
    ATTR{ifalias}==""
    ATTR{netdev_group}=="0"
    ATTR{napi_defer_hard_irqs}=="0"
    ATTR{ifindex}=="29"
    ATTR{broadcast}=="ff:ff:ff:ff:ff:ff"
    ATTR{type}=="1"
    ATTR{dev_port}=="0"
    ATTR{name_assign_type}=="4"
    ATTR{addr_assign_type}=="0"
    ATTR{addr_len}=="6"
    ATTR{threaded}=="0"
    ATTR{tx_queue_len}=="1000"
    ATTR{iflink}=="29"
    ATTR{flags}=="0x1003"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0/0000:04:00.0/0000:05:00.0/domain0/0-0/0-1/0-1.0':
    KERNELS=="0-1.0"
    SUBSYSTEMS=="thunderbolt"
    DRIVERS=="thunderbolt-net"
    ATTRS{prtcstns}=="0x00000003"
    ATTRS{prtcvers}=="1"
    ATTRS{prtcrevs}=="1"
    ATTRS{key}=="network"
    ATTRS{prtcid}=="1"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0/0000:04:00.0/0000:05:00.0/domain0/0-0/0-1':
    KERNELS=="0-1"
    SUBSYSTEMS=="thunderbolt"
    DRIVERS==""
    ATTRS{vendor_name}=="Apple Inc."
    ATTRS{maxhopid}=="15"
    ATTRS{vendor}=="0xa27"
    ATTRS{device}=="0xa"
    ATTRS{rx_lanes}=="1"
    ATTRS{rx_speed}=="20.0 Gb/s"
    ATTRS{unique_id}=="6f46b3a2-b973-4458-a3ff-b8193a7114b5"
    ATTRS{tx_lanes}=="1"
    ATTRS{tx_speed}=="20.0 Gb/s"
    ATTRS{device_name}=="Macmini8,1"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0/0000:04:00.0/0000:05:00.0/domain0/0-0':
    KERNELS=="0-0"
    SUBSYSTEMS=="thunderbolt"
    DRIVERS==""
    ATTRS{nvm_authenticate}=="0x0"
    ATTRS{vendor_name}=="ASUS"
    ATTRS{vendor}=="0x31"
    ATTRS{generation}=="3"
    ATTRS{device}=="0x5007"
    ATTRS{nvm_version}=="56.0"
    ATTRS{unique_id}=="cf030000-0070-740e-033a-832f2c337126"
    ATTRS{device_name}=="PROART Z490-CREATOR 10G"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0/0000:04:00.0/0000:05:00.0/domain0':
    KERNELS=="domain0"
    SUBSYSTEMS=="thunderbolt"
    DRIVERS==""
    ATTRS{boot_acl}==",,,,,,,,,,,,,,,"
    ATTRS{security}=="none"
    ATTRS{deauthorization}=="0"
    ATTRS{iommu_dma_protection}=="1"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0/0000:04:00.0/0000:05:00.0':
    KERNELS=="0000:05:00.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="thunderbolt"
    ATTRS{power_state}=="D0"
    ATTRS{broken_parity_status}=="0"
    ATTRS{subsystem_device}=="0x8794"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{vendor}=="0x8086"
    ATTRS{local_cpus}=="fff"
    ATTRS{class}=="0x088000"
    ATTRS{numa_node}=="-1"
    ATTRS{max_link_width}=="4"
    ATTRS{msi_bus}=="1"
    ATTRS{device}=="0x15eb"
    ATTRS{current_link_width}=="4"
    ATTRS{max_link_speed}=="2.5 GT/s PCIe"
    ATTRS{local_cpulist}=="0-11"
    ATTRS{driver_override}=="(null)"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{irq}=="16"
    ATTRS{revision}=="0x06"
    ATTRS{current_link_speed}=="2.5 GT/s PCIe"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{ari_enabled}=="0"
    ATTRS{enable}=="1"
    ATTRS{subsystem_vendor}=="0x1043"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0/0000:04:00.0':
    KERNELS=="0000:04:00.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="pcieport"
    ATTRS{secondary_bus_number}=="5"
    ATTRS{power_state}=="D0"
    ATTRS{subordinate_bus_number}=="5"
    ATTRS{broken_parity_status}=="0"
    ATTRS{subsystem_device}=="0x8794"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{vendor}=="0x8086"
    ATTRS{local_cpus}=="fff"
    ATTRS{class}=="0x060400"
    ATTRS{numa_node}=="-1"
    ATTRS{max_link_width}=="4"
    ATTRS{msi_bus}=="1"
    ATTRS{device}=="0x15ea"
    ATTRS{current_link_width}=="4"
    ATTRS{max_link_speed}=="8.0 GT/s PCIe"
    ATTRS{local_cpulist}=="0-11"
    ATTRS{driver_override}=="(null)"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{irq}=="128"
    ATTRS{revision}=="0x06"
    ATTRS{current_link_speed}=="2.5 GT/s PCIe"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{ari_enabled}=="0"
    ATTRS{enable}=="1"
    ATTRS{subsystem_vendor}=="0x1043"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4/0000:03:00.0':
    KERNELS=="0000:03:00.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="pcieport"
    ATTRS{secondary_bus_number}=="4"
    ATTRS{power_state}=="D0"
    ATTRS{subordinate_bus_number}=="109"
    ATTRS{broken_parity_status}=="0"
    ATTRS{subsystem_device}=="0x8794"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{vendor}=="0x8086"
    ATTRS{local_cpus}=="fff"
    ATTRS{class}=="0x060400"
    ATTRS{numa_node}=="-1"
    ATTRS{max_link_width}=="4"
    ATTRS{msi_bus}=="1"
    ATTRS{device}=="0x15ea"
    ATTRS{current_link_width}=="4"
    ATTRS{max_link_speed}=="8.0 GT/s PCIe"
    ATTRS{local_cpulist}=="0-11"
    ATTRS{driver_override}=="(null)"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{irq}=="16"
    ATTRS{revision}=="0x06"
    ATTRS{current_link_speed}=="8.0 GT/s PCIe"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{ari_enabled}=="0"
    ATTRS{enable}=="2"
    ATTRS{subsystem_vendor}=="0x1043"

  looking at parent device '/devices/pci0000:00/0000:00:1b.4':
    KERNELS=="0000:00:1b.4"
    SUBSYSTEMS=="pci"
    DRIVERS=="pcieport"
    ATTRS{secondary_bus_number}=="3"
    ATTRS{power_state}=="D0"
    ATTRS{subordinate_bus_number}=="109"
    ATTRS{aer_rootport_total_err_cor}=="0"
    ATTRS{broken_parity_status}=="0"
    ATTRS{subsystem_device}=="0x8694"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{vendor}=="0x8086"
    ATTRS{local_cpus}=="fff"
    ATTRS{class}=="0x060400"
    ATTRS{numa_node}=="-1"
    ATTRS{max_link_width}=="4"
    ATTRS{aer_rootport_total_err_fatal}=="0"
    ATTRS{msi_bus}=="1"
    ATTRS{device}=="0x06ac"
    ATTRS{current_link_width}=="4"
    ATTRS{max_link_speed}=="8.0 GT/s PCIe"
    ATTRS{local_cpulist}=="0-11"
    ATTRS{driver_override}=="(null)"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{irq}=="124"
    ATTRS{revision}=="0xf0"
    ATTRS{current_link_speed}=="8.0 GT/s PCIe"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{ari_enabled}=="0"
    ATTRS{enable}=="2"
    ATTRS{aer_rootport_total_err_nonfatal}=="0"
    ATTRS{subsystem_vendor}=="0x1043"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{waiting_for_supplier}=="0"