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Calling ScsiPortInitialize

  • Artikkeli

If a miniport driver's HBA can be connected on more than one type of I/O bus, the miniport driver must call ScsiPortInitialize for each bus type and can have a different HwScsiFindAdapter routine for each bus type.

After each call to ScsiPortInitialize, such a miniport driver must:

  • Modify the AdapterInterfaceType member.

  • Modify the HwScsiFindAdapter member in HW_INITIALIZATION_DATA (SCSI) if the miniport driver has a different HwScsiFindAdapter routine for that bus type.

  • Modify the miniport driver-supplied context data for the new bus type.

  • Call ScsiPortInitialize for each type of bus on which a supported HBA might be connected.

If the miniport driver is a legacy driver that does not support Plug and Play, ScsiPortInitialize calls the miniport driver's HwScsiFindAdapter routine one or more times before it returns control to the miniport driver's DriverEntry routine. All of the HwScsiFindAdapter calls are made in the context of the miniport driver's DriverEntry routine, in the order DriverEntry called ScsiPortInitialize.

If the miniport driver supports Plug and Play, ScsiPortInitialize stores the initialization data for future use and returns STATUS_SUCCESS to the miniport driver's DriverEntry routine. The port driver does not call the miniport driver's HwScsiFindAdapter routine until the Plug and Play manager detects an HBA for which the miniport driver is registered as a service.

For both Plug and Play and legacy miniport drivers, the port driver does all of the following before it calls the miniport driver's HwScsiFindAdapter routine:

  • Checks the validity of the HW_INITIALIZATION_DATA.

  • Collects and stores pertinent information in the device extension of a device object that it creates to represent the HBA.

  • Allocates memory for and initializes with zeros a device extension of the requested size in which the miniport driver can store driver-determined information about the HBA.

  • Allocates memory for a configuration information buffer that is sizeof(PORT_CONFIGURATION_INFORMATION).

  • In the configuration information buffer, fills in a PORT_CONFIGURATION_INFORMATION structure with as much configuration information about an HBA on a particular I/O bus as possible, from the miniport driver-supplied HW_INITIALIZATION_DATA and from other sources, such as the registry for a legacy miniport driver or from the Plug and Play manager for a Plug and Play miniport driver.

For more information about the miniport driver's HwScsiFindAdapter routine, see SCSI Miniport Driver's HwScsiFindAdapter Routine.

If the miniport driver's DriverEntry routine sets a particular AdapterInterfaceType value in the HW_INITIALIZATION_DATA but there is no bus of that type in the machine, the port driver returns an operating system-specific status value indicating that such an HBA does not exist in the current machine. It does not call the driver-supplied HwScsiFindAdapter routine for that bus type.

A miniport driver does not remain loaded if the machine has no I/O buses of the type(s) specified by the miniport driver's DriverEntry routine.

For a legacy miniport driver, note that ScsiPortInitialize also is responsible for the following before it returns control to the legacy miniport driver's DriverEntry routine:

  • Setting up all necessary system objects.

  • Getting configuration information from and setting configuration information in the registry.

  • Allocating system resources on behalf of the miniport driver, including memory in the amounts indicated by the miniport driver-specified DeviceExtensionSize, SpecificLuExtensionSize, and/or SrbExtensionSize in which the miniport driver can maintain HBA-specific state, per-logical-unit state, and/or per-request state, respectively.

For a Plug and Play miniport driver, the port driver performs these operations after the miniport driver's HwScsiFindAdapter routine returns and before the port driver calls the miniport driver's HwScsiInitialize routine.

Each SCSI miniport driver defines the internal structure and contents of its device extension, logical unit extensions (if any), and SRB extensions (if any). A pointer to the HBA-specific device extension is an input argument to every system-defined miniport driver routine except DriverEntry. Many ScsiPortXxx routines require this pointer as an argument.

ScsiPortInitialize can be called only from a miniport driver's DriverEntry routine. For more information, see HW_INITIALIZATION_DATA (SCSI) and ScsiPortInitialize.