chapter 5.3: KMDF对象模型实现

KMDF相对于UMDF定义了更多object

KMDF object还支持如下类型：

Collection	String
DPC	Timer
Interrupt	WMI
Lookaside list	Work item
Registry key
Several objects for DMA: DMA enabler, DMA transaction, and common buffer	Several objects for hardware resources: resource range list, resource list, and resource requirements list

KMDF不支持命名的属性，而使用registry key object

driver给object method传递handle作为参数

KMDF给event callback传递handle作为参数

KMDF对象类型

Object	Type	Description
Child list	WDFCHILDLIST	Represents a list of the child devices that the bus driver enumerates for a parent device.
Collection	WDFCOLLECTION	Describes a list of similar objects, such as resources or the devices for which a filter driver filters requests.
Device	WDFDEVICE	Represents an instance of a device. A driver typically has one WDFDEVICE object for each device that it controls.
DMA common buffer	WDFCOMMONBUFFER	Represents a buffer that can be accessed by both the device and the driver to perform DMA.
DMA enabler	WDFDMAENABLER	Enables DMA use by a device. A driver that handles device I/O operations has one WDFDMAENABLER object for each DMA channel within the device.
DMA transaction	WDFDMATRANSACTION	Represents a single DMA transaction.
DPC	WDFDPC	Represents a DPC.
Driver	WDFDRIVER	Represents the driver itself and maintains information about the driver, such as its entry points. Every driver has one WDFDRIVER object.
File	WDFFILEOBJECT	Represents a file object through which external drivers or applications can access the device.
Generic object	WDFOBJECT	Represents a generic object for the driver to use as required.
I/O queue	WDFQUEUE	Represents an I/O queue. A driver can have any number of WDFQUEUE objects.
I/O request	WDFREQUEST	Represents a request for device I/O.
I/O target	WDFIOTARGET	Represents a device stack to which the driver is forwarding an I/O request. A driver can have any number of WDFIOTARGET objects.
Interrupt	WDFINTERRUPT	Represents a device's interrupt object. Any driver that handles device interrupts has one WDFINTERRUPT object for each IRQ or message-signaled interrupt (MSI) that the device can trigger.
Lookaside list	WDFLOOKASIDE	Represents a dynamically sized list of identical buffers that are allocated from either paged or nonpaged pool.
Memory	WDFMEMORY	Represents memory that the driver uses, typically an input or output buffer that is associated with an I/O request.
Registry key	WDFKEY	Represents a registry key.
Resource list	WDFCMRESLIST	Represents the list of resources that have actually been assigned to the device.
Resource range list	WDFIORESLIST	Represents a possible configuration for a device.
Resource requirements list	WDFIORESREQLIST	Represents a set of I/O resource lists, which comprises all possible configurations for the device. Each element of the list is a WDFIORESLIST object.
String	WDFSTRING	Represents a counted Unicode string.
Synchronization: spin lock	WDFSPINLOCK	Represents a spin lock, which synchronizes access to data DISPATCH_LEVEL.
Synchronization: wait lock	WDFWAITLOCK	Represents a wait lock, which synchronizes access to data at PASSIVE_LEVEL.
Timer	WDFTIMER	Represents a timer that fires either once or periodically and causes a callback routine to run.
USB device	WDFUSBDEVICE	Represents a USB device.
USB interface	WDFUSBINTERFACE	Represents an interface on a USB device.
USB pipe	WDFUSBPIPE	Represents a configured pipe in a USB interface's setting.
WMI instance	WDFWMIINSTANCE	Represents an individual WMI data block that is associated with a particular provider.
WMI provider	WDFWMIPROVIDER	Represents the schema for WMI data blocks that the driver provides.
Work item	WDFWORKITEM	Represents a work item, which runs in a system thread at PASSIVE_LEVEL.

*Framework object只受framework管理，而不是Windows object manager和ObXxx方法

*Framework object之手创建它的driver管理，不能在不同的framework driver中共享

KMDF命名规则

method：WDF[Ojbect][Operation]

[Object]： method操作的KMDF object

[Operation]： method做什么

例子：WdfDeviceCreate

Property： Wdf[Object]{Set|Get}[Data] Wdf[Object]{Set|Get}[Data]

[Object]:函数操作的KMDF object

[Data]：field

例子：VOID WdfInterruptGetInfo

KMDF event callback function： Evt[Object][Description]

[Object]： 函数操作的object

[Description]: 什么触发了callback

大多数sample driver会把Evt替换为driver名称，比如Osrusbfx2 driver的callback函数前缀为OsrFxEvt

例子：若device能被eject，则注册一个EvtDeviceEject callback，在PnP向设备发送IRP_MN_EJECT请求时会调用。

*KMDF event与windows提供的kernel-dispatcher event（同步机制）无关

*driver无法创建，操控或等待一个KMDF event，因为KMDF event只是一个函数。可以使用timer object