This show you the DeviceExtension of the PCI device object.
0: kd> !devobj 0xfffffa8002108a10
Device object (fffffa8002108a10) is for:
NTPNP_PCI0022 \Driver\pci DriverObject fffffa80012201c0
Current Irp 00000000 RefCount 0 Type 00000023 Flags 00001840
Dacl fffff9a1092d5981 DevExt fffffa8002108b60 DevObjExt fffffa8002108f88 DevNode fffffa8002109990
ExtensionFlags (0000000000)
AttachedDevice (Upper) fffffa8002109e40 \Driver\ACPI
Device queue is not busy.
0: kd> dt nt!_device_object 0xfffffa8002108a10
+0x000 Type : 0n3
+0x002 Size : 0x578
+0x004 ReferenceCount : 0n0
+0x008 DriverObject : 0xfffffa80`012201c0 _DRIVER_OBJECT
+0x010 NextDevice : 0xfffffa80`02103910 _DEVICE_OBJECT
+0x018 AttachedDevice : 0xfffffa80`02109e40 _DEVICE_OBJECT
+0x020 CurrentIrp : (null)
+0x028 Timer : (null)
+0x030 Flags : 0x1840
+0x034 Characteristics : 0x100
+0x038 Vpb : (null)
+0x040 DeviceExtension :
0xfffffa80`02108b60 Void
+0x048 DeviceType : 0x23
+0x04c StackSize : 1 ''
+0x050 Queue : <unnamed-tag>
+0x098 AlignmentRequirement : 0
+0x0a0 DeviceQueue : _KDEVICE_QUEUE
+0x0c8 Dpc : _KDPC
+0x108 ActiveThreadCount : 0
+0x110 SecurityDescriptor : 0xfffff8a0`092d5980 Void
+0x118 DeviceLock : _KEVENT
+0x130 SectorSize : 0
+0x132 Spare1 : 1
+0x138 DeviceObjectExtension : 0xfffffa80`02108f88 _DEVOBJ_EXTENSION
+0x140 Reserved : (null)
0: kd> dt pci!_PCI_DEVICE
0xfffffa80`02108b60
+0x000 Signature : 0x44696350
+0x004 DeviceState : 0x1 ''
+0x005 TentativeNextState : 0x1 ''
+0x008 DeviceUsage : _PCI_DEVICE_USAGE
+0x014 BusNumber : 1
+0x018 Slot : _PCI_SLOT_NUMBER
+0x01c VendorID : 0x1002
+0x01e DeviceID : 0x6840
+0x020 RevisionID : 0 ''
+0x021 BaseClass : 0x3 ''
+0x022 SubClass : 0 ''
+0x023 ProgIf : 0 ''
+0x024 SubVendorID : 0x1043
+0x026 SubSystemID : 0x10dc
+0x028 HeaderType : 0 ''
+0x029 InterruptPin : 0x1 ''
+0x02a FirstCapability : 0x50 'P'
+0x02b PowerCapability : 0x50 'P'
+0x02c SubIDsCapability : 0 ''
+0x02d AgpCapability : 0 ''
+0x02e PciXCapability : 0 ''
+0x02f MsiCapability : 0xa0 ''
+0x030 MsiXCapability : 0 ''
+0x031 FirstHtCapability : 0 ''
+0x032 HtMsiMapCapability : 0 ''
+0x033 ExpressCapability : 0x58 'X'
+0x034 PossibleDecodes : 4
+0x036 ResourceDecodes : 7
+0x038 PreviousCommand : 0
+0x040 DeviceObject : 0xfffffa80`02108a10 _DEVICE_OBJECT
+0x048 Root : 0xfffffa80`020cebb0 _PCI_ROOT
+0x050 Parent : 0xfffffa80`020fee00 _PCI_BUS
+0x058 Sibling : (null)
+0x060 RemoveLock : _IO_REMOVE_LOCK
+0x080 ExpressCompatibilityPort : 0xfffffa80`020df850 _EXPRESS_COMPATIBILITY_PORT
+0x088 ExpressPort : (null)
+0x090 HotPlugSlot : (null)
+0x098 InstanceIdSerialNumber : 0
+0x0a0 Resources : _PCI_DEVICE_RESOURCES
+0x190 Requirements : _PCI_DEVICE_REQUIREMENTS
+0x310 InterruptResource : _PCI_DEVICE_INTERRUPT_RESOURCE
+0x360 InterruptRequirement : _PCI_DEVICE_INTERRUPT_REQUIREMENT
+0x3a8 SavedRegisters : _PCI_SAVE_RESTORE_DATA
+0x3b4 CapturedProcessorCount : 4
+0x3b8 LogicalPowerState : 4 ( PowerDeviceD3 )
+0x3bc WakeLevel : 0 ( PowerDeviceUnspecified )
+0x3c0 PowerSupport : _PM_SUPPORT
+0x3c8 WakeIrp : (null)
+0x3d0 WakeIrpState : 0n0
+0x3d8 WakeIrpLock : 0
+0x3e0 ConfigureMwi : 0y0
+0x3e0 BusNumbersConfigured : 0y0
+0x3e0 OnDebugPath : 0y0
+0x3e0 MovedDeviceResources : 0y1
+0x3e0 LegacyDriver : 0y0
+0x3e0 NativeIdeSwitchAllowed : 0y0
+0x3e0 IdeInNativeMode : 0y0
+0x3e0 IdeInterfaceActive : 0y0
+0x3e0 Present : 0y1
+0x3e0 ReportedMissing : 0y0
+0x3e0 Connected : 0y1
+0x3e0 PmeOwned : 0y1
+0x3e0 HyperTransport : 0y0
+0x3e0 MsiHtConverter : 0y0
+0x3e0 ExtendedConfigAvailable : 0y1
+0x3e0 B2On66MHzSegmentIllegal : 0y0
+0x3e0 Device66MHzCapable : 0y0
+0x3e0 DsmToIgnoreBootConfigEvaluated : 0y1
+0x3e0 IgnoreBootConfig : 0y0
+0x3e0 Reserved : 0y0000000000000 (0)
+0x3e4 BridgeFlags : <unnamed-tag>
+0x3e8 HackFlags : 0x20`00000002
+0x3f0 Operations : 0xfffff880`00e8d1c8 _PCI_HEADER_OPERATIONS
+0x3f8 InterruptRoutingToken : ROUTING_TOKEN
+0x408 PciBusInterfaceCount : 0n2
+0x40c AgpTargetInterfaceRefCount : 0n0
+0x410 PciCardBusInterfaceCount : 0n0
+0x414 PciDevicePresentInterfaceCount : 0n1
+0x418 PciNativeIdeInterfaceCount : 0n0
+0x41c PciLocationInterfaceCount : 0n0
+0x420 EnumFailureCode : 0