# PCI Capabilities Constants that you use to get the capabilities of the PCI device. ## Topics ### Capability Bits [`kIOPCICapabilityIDOffset`](/documentation/PCIDriverKit/kIOPCICapabilityIDOffset) The offset to the location of the device’s capability ID. [`kIOPCINextCapabilityOffset`](/documentation/PCIDriverKit/kIOPCINextCapabilityOffset) The offset to the next PCI capability structure. [`kIOPCICapabilityIDPowerManagement`](/documentation/PCIDriverKit/kIOPCICapabilityIDPowerManagement) The identifier for the power management interface. [`kIOPCICapabilityIDAGP`](/documentation/PCIDriverKit/kIOPCICapabilityIDAGP) The identifier for the AGP capability. [`kIOPCICapabilityIDVitalProductData`](/documentation/PCIDriverKit/kIOPCICapabilityIDVitalProductData) The identifier for the vital product data capability. [`kIOPCICapabilityIDSlotID`](/documentation/PCIDriverKit/kIOPCICapabilityIDSlotID) The identifier for the slot identification capability. [`kIOPCICapabilityIDMSI`](/documentation/PCIDriverKit/kIOPCICapabilityIDMSI) The identifier for the MSI capability. [`kIOPCICapabilityIDCPCIHotswap`](/documentation/PCIDriverKit/kIOPCICapabilityIDCPCIHotswap) The identifier for the CompactPCI hot swap capability. [`kIOPCICapabilityIDPCIX`](/documentation/PCIDriverKit/kIOPCICapabilityIDPCIX) The identifier for the PCI-X capability. [`kIOPCICapabilityIDLDT`](/documentation/PCIDriverKit/kIOPCICapabilityIDLDT) The identifier for the HyperTransport capability. [`kIOPCICapabilityIDVendorSpecific`](/documentation/PCIDriverKit/kIOPCICapabilityIDVendorSpecific) The identifier for any vendor-specific capabilities. [`kIOPCICapabilityIDDebugPort`](/documentation/PCIDriverKit/kIOPCICapabilityIDDebugPort) The identifier for the debug port capability. [`kIOPCICapabilityIDCPCIResourceControl`](/documentation/PCIDriverKit/kIOPCICapabilityIDCPCIResourceControl) The identifier for the CompactPCI central resource control capability. [`kIOPCICapabilityIDHotplug`](/documentation/PCIDriverKit/kIOPCICapabilityIDHotplug) The identifier for the PCI hot plug capability. [`kIOPCICapabilityIDAGP8`](/documentation/PCIDriverKit/kIOPCICapabilityIDAGP8) The identifier for the AGP 8x capability. [`kIOPCICapabilityIDSecure`](/documentation/PCIDriverKit/kIOPCICapabilityIDSecure) The identifer for the secure device capability. [`kIOPCICapabilityIDPCIExpress`](/documentation/PCIDriverKit/kIOPCICapabilityIDPCIExpress) The identifier for the PCI Express capability. [`kIOPCICapabilityIDMSIX`](/documentation/PCIDriverKit/kIOPCICapabilityIDMSIX) The identifer for the MSI-X capability. [`kIOPCICapabilityIDFPB`](/documentation/PCIDriverKit/kIOPCICapabilityIDFPB) The identifier for the flattening portal bridge capability. [`kIOPCIExpressCapabilityIDErrorReporting`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDErrorReporting) The identifier for the advanced error reporting extended capability. [`kIOPCIExpressCapabilityIDVirtualChannel`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDVirtualChannel) The identifier for the virtual channel extended capability. [`kIOPCIExpressCapabilityIDDeviceSerialNumber`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDDeviceSerialNumber) The identifier for the device serial number extended capability. [`kIOPCIExpressCapabilityIDPowerBudget`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDPowerBudget) The identifier for the power budgeting extended capability. [`kIOPCIExpressCapabilityIDAccessControlServices`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDAccessControlServices) The identifier for the access control services extended capability. [`kIOPCIExpressCapabilityIDLatencyTolerenceReporting`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDLatencyTolerenceReporting) The identifier for the latency tolerance reporting extended capability. [`kIOPCIExpressCapabilityIDL1PMSubstates`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDL1PMSubstates) The identifier for the L1 power management substates extended capability. ### Constants [`kIOPCIExpressCapabilityIDAlternativeRoutingID`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDAlternativeRoutingID) [`kIOPCIExpressCapabilityIDPrecisionTimeManagement`](/documentation/PCIDriverKit/kIOPCIExpressCapabilityIDPrecisionTimeManagement) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)