StorPortSetPowerSettingNotificationGuids function (storport.h)

Article
10/21/2021

The StorPortSetPowerSettingNotificationGuids routine enables a miniport to receive power setting notifications. The miniport registers an array of GUIDs which identify the power settings to receive power change notifications for.

Syntax

ULONG StorPortSetPowerSettingNotificationGuids(
  [in] PVOID  HwDeviceExtension,
  [in] ULONG  GuidCount,
  [in] LPGUID Guid
);

Parameters

[in] HwDeviceExtension

A pointer to the hardware device extension for the host bus adapter (HBA).

[in] GuidCount

The number of GUIDs in the Guid array.

[in] Guid

An array of power setting GUIDs to register for notification. A typical use for registering these GUIDs is for SATA miniports to receive notifications for AHCI Link Power Management setting changes. The AHCI Link Power Management settings defined by the Microsoft AHCI StorPort miniport driver are the following.

HIPM/DIPM Setting (0b2d69d7-a2a1-449c-9680-f91c70521c60)

Configures the link power management mode for disk and storage devices that are attached to the system through an AHCI interface.

Index	Name	Description
0	Active	Link power management is not used.
1	HIPM	Host-Initiated Power Management (HIPM) is used.
2	HIPM and DIPM	HIPM and Device-Initiated Power Management (DIPM) are used.

Adaptive Setting (dab60367-53fe-4fbc-825e-521d069d2456)

The period of AHCI link idle time before the link is put into a slumber state when HIPM or DIPM is enabled.

Value	Description
0	Minimum value in milliseconds (only use Partial state).
...	Any intermediate value.
300000	Maximum value in milliseconds (5 minutes).

Other miniports may define and register their own power setting GUIDs.

Return value

The StorPortSetPowerSettingNotificationGuids routine returns one of these status codes:

Return code	Description
STOR_STATUS_INSUFFICIENT_RESOURCES	Insufficient resources are available to register for notifications.
STOR_STATUS_SUCCESS	The notification GUIDs were registered successfully.

Remarks

A miniport calls StorPortSetPowerSettingNotificationGuids in its HwStorFindAdapter routine to register the GUIDs it requests to receive notifications for.

When a power state change occurs for a registered notification, the miniport is notified in its HwStorAdapterControl routine. The control type of ScsiPowerSettingNotification is set in the ControlType parameter.

The AHCI Link Power management settings are part of the Disk Settings subgroup (0012ee47-9041-4b5d-9b77-535fba8b1442) in the power policy configuration. These are managed under the SUB_DISK configuration alias with powercfg.exe.

Requirements

Requirement	Value
Minimum supported client	Available in starting with Windows 8.
Target Platform	Universal
Header	storport.h (include Storport.h)
IRQL	Any

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