class
- Contains the device class code in hexadecimal format (e.g., 0x060000 for a host bridge).
device
- Contains the device ID in hexadecimal format (e.g., 0x1450).
vendor
- Contains the vendor ID in hexadecimal format (e.g., 0x1022 for AMD).
config
- A binary file containing the raw PCI configuration space for the device.
resource
- Contains the memory and I/O resources allocated to the device.
resource0, resource1, etc.
- Represent the actual memory or I/O regions allocated to the device.
driver
- A symlink to the driver currently bound to the device (if any).
irq
- Contains the interrupt number assigned to the device.
local_cpus
- Lists the CPUs that are local to the device.
local_cpulist
- Similar to local_cpus, but in a human-readable format.
numa_node
- Indicates the NUMA node associated with the device.
enable
- A file that can be used to enable or disable the device (write 1 to enable, 0 to disable).
broken_parity_status
- Indicates whether the device has reported broken parity.
msi_bus
- Indicates whether MSI (Message Signaled Interrupts) is enabled for the device.
msi_irqs
- Lists the MSI interrupts assigned to the device.
power/
- A directory containing power management-related files:
control: Controls the device’s power state.
runtime_status: Shows the current runtime power state of the device.
wakeup: Indicates whether the device can wake the system from sleep.
subsystem/
- A symlink to the PCI subsystem directory.
uevent
- Used to trigger uevents for the device.
firmware_node/
- A directory containing firmware-related information for the device.
remove
- Writing 1 to this file removes the device from the system.
rescan
- Writing 1 to this file triggers a rescan of the PCI bus.
reset
- Writing 1 to this file resets the device.
rom
- Contains the device’s ROM (if available).
sriov_numvfs
- Used to configure the number of Virtual Functions (VFs) for SR-IOV-capable devices.
sriov_totalvfs
- Indicates the total number of Virtual Functions (VFs) supported by the device.
ari_enabled
- Indicates whether ARI (Alternative Routing-ID Interpretation) is enabled for the device.
d3cold_allowed
- Indicates whether the device is allowed to enter the D3cold power state.
dma_mask_bits
- Indicates the DMA mask bits supported by the device.
consistent_dma_mask_bits
- Indicates the consistent DMA mask bits supported by the device.
modalias
- Contains the device’s modalias string, used for module autoloading.
iommu_group/
- A directory containing information about the IOMMU group the device belongs to.
iommu/
- A directory containing IOMMU-related information for the device.
devspec/
- A directory containing device-specific information (if available).
acpi_index
- Contains the ACPI index of the device (if applicable).
label
- Contains a human-readable label for the device (if available).
physfn/
- A symlink to the physical function of an SR-IOV-capable device (if applicable).
virtfn0/, virtfn1/, etc.
- Symlinks to the virtual functions of an SR-IOV-capable device (if applicable).
driver_override
- Allows overriding the default driver binding for the device.
pcie_flr_retrain
- Used to trigger a Function Level Reset (FLR) and retrain the PCIe link.
pcie_replay_count
- Indicates the number of replay attempts on the PCIe link.
pcie_link_width
- Indicates the current width of the PCIe link.
pcie_link_speed
- Indicates the current speed of the PCIe link.
pcie_bus_peer2peer
- Indicates whether peer-to-peer communication is enabled on the PCIe bus.
pcie_aer/
- A directory containing AER (Advanced Error Reporting) information for the device.
pcie_aspm/
- A directory containing ASPM (Active State Power Management) information for the device.
pcie_aspm_l1ss/
- A directory containing L1 Substate ASPM information for the device.
pcie_aspm_ltr/
- A directory containing LTR (Latency Tolerance Reporting) information for the device.
pcie_aspm_power/
- A directory containing power-related ASPM information for the device.
pcie_aspm_policy/
- A directory containing ASPM policy information for the device.
pcie_aspm_state/
- A directory containing ASPM state information for the device.
pcie_aspm_supported/
- A directory containing information about supported ASPM states for the device.
pcie_aspm_control/
- A directory containing ASPM control information for the device.
pcie_aspm_capability/
- A directory containing ASPM capability information for the device.
pcie_aspm_status/
- A directory containing ASPM status information for the device.
pcie_aspm_config/
- A directory containing ASPM configuration information for the device.
pcie_aspm_debug/
- A directory containing debug information for ASPM.
pcie_aspm_disable/
- A file used to disable ASPM for the device.
pcie_aspm_enable/
- A file used to enable ASPM for the device.
pcie_aspm_force/
- A file used to force ASPM settings for the device.
pcie_aspm_l1ss_control/
- A file used to control L1 Substate ASPM for the device.
pcie_aspm_l1ss_status/
- A file containing L1 Substate ASPM status for the device.
pcie_aspm_l1ss_capability/
- A file containing L1 Substate ASPM capability information for the device.
pcie_aspm_l1ss_config/
- A file containing L1 Substate ASPM configuration information for the device.
pcie_aspm_l1ss_debug/
- A file containing debug information for L1 Substate ASPM.
pcie_aspm_l1ss_disable/
- A file used to disable L1 Substate ASPM for the device.
pcie_aspm_l1ss_enable/
- A file used to enable L1 Substate ASPM for the device.
pcie_aspm_l1ss_force/
- A file used to force L1 Substate ASPM settings for the device.
pcie_aspm_l1ss_supported/
- A file containing information about supported L1 Substate ASPM states for the device.
pcie_aspm_l1ss_control/
- A file used to control L1 Substate ASPM for the device.
pcie_aspm_l1ss_status/
- A file containing L1 Substate ASPM status for the device.
pcie_aspm_l1ss_capability/
- A file containing L1 Substate ASPM capability information for the device.
pcie_aspm_l1ss_config/
- A file containing L1 Substate ASPM configuration information for the device.
pcie_aspm_l1ss_debug/
- A file containing debug information for L1 Substate ASPM.
pcie_aspm_l1ss_disable/
- A file used to disable L1 Substate ASPM for the device.
pcie_aspm_l1ss_enable/
- A file used to enable L1 Substate ASPM for the device.
pcie_aspm_l1ss_force/
- A file used to force L1 Substate ASPM settings for the device.
pcie_aspm_l1ss_supported/
- A file containing information about supported L1 Substate ASPM states for the device.