StorPortPoFxSetComponentLatency - NtDoc
Native API online documentation, based on the System Informer
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headers
// storport.h
ULONG StorPortPoFxSetComponentLatency(
[in] PVOID HwDeviceExtension,
[in, optional] PSTOR_ADDRESS Address,
[in] ULONG Component,
[in] ULONGLONG Latency
);
View the official Windows Driver Kit DDI referenceNo description available.
The StorPortPoFxSetComponentLatency routine specifies the maximum latency that can be tolerated in the transition from the idle condition to the active condition in the specified storage device component.
HwDeviceExtension [in]A pointer to the hardware device extension for the host bus adapter (HBA). This is the device extension used to register the device in a prior call to StorPortInitializePoFxPower.
Address [in, optional]The address of a storage device unit. This parameter is NULL when setting the latency of a storage adapter component.
Component [in]The index that identifies the component. This parameter is an index into the Components array in the STOR_POFX_DEVICE structure that the miniport driver registered for the device with a call to StorPortInitializePoFxPower. If the Components array contains N elements, component indexes range from 0 to N–1.
Latency [in]The time, in units of 100 nanoseconds, that the storage device component can tolerate for a transition from an idle state the active state.
The StorPortPoFxSetComponentLatency routine returns one of these status codes:
| Return code | Description |
|---|---|
| STOR_STATUS_SUCCESS | The component latency successfully set. |
| STOR_STATUS_INVALID_PARAMETER | Either HwDeviceExtension or Device is NULL. -or- Address points to an invalid unit address structure. -or- The storage device specified by Address is not found. -or- The index in Component specifies a component greater than the component count for the device. |
| STOR_STATUS_INVALID_DEVICE_REQUEST | The storage device is not registered with the power management framework (PoFx). |
| STOR_STATUS_INVALID_IRQL | The current IRQL > DISPATCH_LEVEL. |