NVME_ADMIN_QUEUE_ATTRIBUTES union (nvme.h)

Contains the Admin Queue Attributes (AQA) for the Admin Submission Queue and Admin Completion Queue.

The Queue Identifier for the Admin Submission Queue and Admin Completion Queue is 0h. The Admin Submission Queue’s priority is determined by the selected arbitration mechanism. The Admin Submission Queue and Admin Completion Queue are required to be in physically contiguous memory.

Syntax

typedef union {
  struct {
    ULONG ASQS : 12;
    ULONG Reserved0 : 4;
    ULONG ACQS : 12;
    ULONG Reserved1 : 4;
  } DUMMYSTRUCTNAME;
  ULONG  AsUlong;
} NVME_ADMIN_QUEUE_ATTRIBUTES, *PNVME_ADMIN_QUEUE_ATTRIBUTES;

Members

DUMMYSTRUCTNAME

DUMMYSTRUCTNAME.ASQS

Admin Submission Queue Size (ASQS) is a Read/Write field that defines the size of the Admin Submission Queue in entries.

Enabling a controller while this field is cleared to 00h produces undefined results. The minimum size of the Admin Submission Queue is two entries. The maximum size of the Admin Submission Queue is 4096 entries. This is a 0’s based value.

DUMMYSTRUCTNAME.Reserved0

A Read Only reserved field.

DUMMYSTRUCTNAME.ACQS

Admin Completion Queue Size (ACQS) is a Read/Write field that defines the size of the Admin Completion Queue in entries.

Enabling a controller while this field is cleared to 00h produces undefined results. The minimum size of the Admin Completion Queue is two entries. The maximum size of the Admin Completion Queue is 4096 entries. This is a 0’s based value.

DUMMYSTRUCTNAME.Reserved1

A Read Only reserved field.

AsUlong

Remarks

Note

A Unified Extensible Firmware Interface (UEFI) should be used during boot operations. In low memory environments (like Option ROMs in legacy BIOS environments) there may not be sufficient available memory to allocate the necessary Submission and Completion Queues. In these types of conditions, low memory operation of the controller is vendor specific.

Requirements

Requirement	Value
Minimum supported client	Windows 10
Header	nvme.h