StorPortGetBusData function (storport.h)
The StorPortGetBusData routine retrieves the bus-specific configuration information necessary to initialize the HBA.
Syntax
STORPORT_API ULONG StorPortGetBusData(
[in] PVOID DeviceExtension,
[in] ULONG BusDataType,
[in] ULONG SystemIoBusNumber,
[in] ULONG SlotNumber,
[in, out] PVOID Buffer,
[in] ULONG Length
);
Parameters
[in] DeviceExtension
Pointer to the miniport driver's per-HBA storage area.
[in] BusDataType
Contains a value of type BUS_DATA_TYPE that specifies the type of bus-specific configuration data to be returned. Currently, this value can be one of the following: Cmos, EisaConfiguration, Pos, or PCIConfiguration. However, additional types of bus configuration will be supported in the future. The upper bound on the types supported is always MaximumBusDataType.
[in] SystemIoBusNumber
Specifies the system-assigned number of the I/O bus. The miniport driver's HwStorFindAdapter routine obtains this value from the SystemIoBusNumber member initially set in PORT_CONFIGURATION_INFORMATION.
[in] SlotNumber
Specifies the logical slot number or location of the device.
If PCIConfiguration is specified as the BusDataType, this parameter must be specified as a PCI_SLOT_NUMBER-type value.
[in, out] Buffer
Pointer to a buffer or area to which the configuration data is returned or, if the given Length is zero, points to a location to which the OS-specific port driver returns a pointer to a buffer that it allocates.
[in] Length
Specifies the maximum number of bytes to return at Buffer, or zero if the caller requires the OS-specific port driver to allocate a buffer to contain the data.
Return value
StorPortGetBusData returns the number of bytes of configuration information it stored in the buffer. When the input BusDataType is PCIConfiguration, StorPortGetBusData can return either of the following values to indicate an error.
| Return code | Description |
|---|---|
| 0 (zero) | The PCI bus does not exist. |
| 2 | The PCI bus exists, but there is no device at the given PCI SlotNumber. The Buffer contains the value PCI_INVALID_VENDOR_ID at the PCI_COMMON_CONFIG VendorId member. |
Remarks
A miniport driver can call StorPortGetBusData from the following routines:
- From its HwStorFindAdapter callback routine.
- From its HwStorAdapterControl only when the ControlType is ScsiSetRunningConfig.
Calls from other miniport driver routines will result in system failure or incorrect operation for the caller.
Configuration data returned by StorPortGetBusData is valid only until the miniport driver calls StorPortGetBusData again. As soon as the caller's HwStorFindAdapter routine returns control, any returned configuration data becomes invalid.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Header | storport.h (include Storport.h) |
| Library | Storport.lib |