468 lines
13 KiB
C
468 lines
13 KiB
C
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/*++
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Copyright (C) Microsoft Corporation, 1997 - 1998
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Module Name:
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pmwmireg.c
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Abstract:
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This file contains routines to register for and handle WMI queries.
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Author:
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Bruce Worthington 26-Oct-1998
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Environment:
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kernel mode only
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Notes:
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Revision History:
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--*/
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#define RTL_USE_AVL_TABLES 0
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#include <ntosp.h>
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#include <stdio.h>
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#include <ntddvol.h>
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#include <ntdddisk.h>
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#include <wdmguid.h>
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#include <volmgr.h>
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#include <wmistr.h>
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#include <wmikm.h>
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#include <wmilib.h>
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#include <partmgr.h>
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#include <pmwmicnt.h>
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#include <initguid.h>
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#include <wmiguid.h>
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#include <zwapi.h>
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NTSTATUS
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PmDetermineDeviceNameAndNumber(
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IN PDEVICE_OBJECT DeviceObject,
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OUT PULONG WmiRegistrationFlags
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);
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NTSTATUS PmRegisterDevice(
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IN PDEVICE_OBJECT DeviceObject,
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ULONG WmiRegistrationFlags
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);
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NTSTATUS
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PmQueryWmiRegInfo(
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IN PDEVICE_OBJECT DeviceObject,
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OUT ULONG *RegFlags,
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OUT PUNICODE_STRING InstanceName,
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OUT PUNICODE_STRING *RegistryPath,
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OUT PUNICODE_STRING MofResourceName,
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OUT PDEVICE_OBJECT *Pdo
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);
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NTSTATUS
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PmQueryWmiDataBlock(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp,
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IN ULONG GuidIndex,
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IN ULONG InstanceIndex,
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IN ULONG InstanceCount,
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IN OUT PULONG InstanceLengthArray,
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IN ULONG BufferAvail,
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OUT PUCHAR Buffer
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);
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BOOLEAN
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PmQueryEnableAlways(
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IN PDEVICE_OBJECT DeviceObject
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);
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WMIGUIDREGINFO DiskperfGuidList[] =
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{
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{ &DiskPerfGuid,
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1,
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0
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}
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};
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ULONG DiskperfGuidCount = (sizeof(DiskperfGuidList) / sizeof(WMIGUIDREGINFO));
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text (PAGE, PmDetermineDeviceNameAndNumber)
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#pragma alloc_text (PAGE, PmRegisterDevice)
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#pragma alloc_text (PAGE, PmQueryWmiRegInfo)
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#pragma alloc_text (PAGE, PmQueryWmiDataBlock)
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#pragma alloc_text (PAGE, PmQueryEnableAlways)
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#endif
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NTSTATUS
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PmDetermineDeviceNameAndNumber(
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IN PDEVICE_OBJECT DeviceObject,
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OUT PULONG WmiRegistrationFlags
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)
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/*++
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Routine Description:
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Routine to initialize a proper name for the device object
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Arguments:
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DeviceObject - pointer to a device object to be initialized.
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Return Value:
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Status of the initialization. NOTE: If the registration fails,
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the device name in the DeviceExtension will be left as empty.
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--*/
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{
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NTSTATUS status;
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IO_STATUS_BLOCK ioStatus;
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KEVENT event;
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PDEVICE_EXTENSION deviceExtension;
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PIRP irp;
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STORAGE_DEVICE_NUMBER number;
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PAGED_CODE();
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deviceExtension = DeviceObject->DeviceExtension;
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KeInitializeEvent(&event, NotificationEvent, FALSE);
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//
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// Request for the device number
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//
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irp = IoBuildDeviceIoControlRequest(
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IOCTL_STORAGE_GET_DEVICE_NUMBER,
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deviceExtension->TargetObject,
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NULL,
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0,
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&number,
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sizeof(number),
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FALSE,
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&event,
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&ioStatus);
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if (!irp) {
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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status = IoCallDriver(deviceExtension->TargetObject, irp);
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if (status == STATUS_PENDING) {
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KeWaitForSingleObject(&event, Executive, KernelMode, FALSE, NULL);
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status = ioStatus.Status;
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}
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if (!NT_SUCCESS(status)) {
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return status;
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}
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//
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// Remember the disk number for use as parameter in
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// PhysicalDiskIoNotifyRoutine and for epoch update
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// notifications
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//
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deviceExtension->DiskNumber = number.DeviceNumber;
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//
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// Create device name for each partition
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//
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deviceExtension->PhysicalDeviceName.MaximumLength = sizeof (deviceExtension->PhysicalDeviceNameBuffer);
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deviceExtension->PhysicalDeviceName.Buffer = deviceExtension->PhysicalDeviceNameBuffer;
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deviceExtension->PhysicalDeviceName.Length =
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sizeof (WCHAR) * _snwprintf (deviceExtension->PhysicalDeviceNameBuffer,
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deviceExtension->PhysicalDeviceName.MaximumLength / sizeof (WCHAR),
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L"\\Device\\Harddisk%d\\Partition%d",
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number.DeviceNumber,
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number.PartitionNumber);
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*WmiRegistrationFlags = (0 == number.PartitionNumber)
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? WMIREG_FLAG_TRACE_PROVIDER | WMIREG_NOTIFY_DISK_IO
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: 0;
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return status;
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}
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NTSTATUS
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PmRegisterDevice(
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IN PDEVICE_OBJECT DeviceObject,
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IN ULONG WmiRegistrationFlags
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)
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/*++
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Routine Description:
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Routine to register the device with WMI
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Arguments:
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DeviceObject - pointer to a device object to be initialized.
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Return Value:
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Status of the initialization.
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--*/
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{
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NTSTATUS status = STATUS_SUCCESS;
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PDEVICE_EXTENSION deviceExtension;
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PAGED_CODE();
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deviceExtension = DeviceObject->DeviceExtension;
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if (deviceExtension->PhysicalDeviceName.Length > 0) {
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// Create device name for each partition
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status = IoWMIRegistrationControl(DeviceObject,
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WMIREG_ACTION_REGISTER | WmiRegistrationFlags );
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if (NT_SUCCESS(status)) {
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PmWmiCounterEnable(&deviceExtension->PmWmiCounterContext);
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PmWmiCounterDisable(&deviceExtension->PmWmiCounterContext,
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FALSE, FALSE);
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}
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}
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return status;
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}
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NTSTATUS
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PmQueryWmiRegInfo(
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IN PDEVICE_OBJECT DeviceObject,
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OUT ULONG *RegFlags,
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OUT PUNICODE_STRING InstanceName,
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OUT PUNICODE_STRING *RegistryPath,
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OUT PUNICODE_STRING MofResourceName,
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OUT PDEVICE_OBJECT *Pdo
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)
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/*++
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Routine Description:
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This routine is a callback into the driver to retrieve information about
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the guids being registered.
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Implementations of this routine may be in paged memory
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Arguments:
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DeviceObject is the device whose registration information is needed
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*RegFlags returns with a set of flags that describe all of the guids being
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registered for this device. If the device wants enable and disable
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collection callbacks before receiving queries for the registered
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guids then it should return the WMIREG_FLAG_EXPENSIVE flag. Also the
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returned flags may specify WMIREG_FLAG_INSTANCE_PDO in which case
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the instance name is determined from the PDO associated with the
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device object. Note that the PDO must have an associated devnode. If
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WMIREG_FLAG_INSTANCE_PDO is not set then Name must return a unique
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name for the device. These flags are ORed into the flags specified
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by the GUIDREGINFO for each guid.
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InstanceName returns with the instance name for the guids if
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WMIREG_FLAG_INSTANCE_PDO is not set in the returned *RegFlags. The
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caller will call ExFreePool with the buffer returned.
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*RegistryPath returns with the registry path of the driver. This is
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required
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MofResourceName returns with the name of the MOF resource attached to
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the binary file. If the driver does not have a mof resource attached
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then this can be returned unmodified. If a value is returned then
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it is NOT freed.
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The MOF file is assumed to be already included in wmicore.mof
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*Pdo returns with the device object for the PDO associated with this
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device if the WMIREG_FLAG_INSTANCE_PDO flag is retured in
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*RegFlags.
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Return Value:
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status
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--*/
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{
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NTSTATUS status;
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PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;
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PAGED_CODE();
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RtlInitUnicodeString (InstanceName, NULL);
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*RegistryPath = &deviceExtension->DriverExtension->DiskPerfRegistryPath;
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*RegFlags = WMIREG_FLAG_INSTANCE_PDO | WMIREG_FLAG_EXPENSIVE;
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*Pdo = deviceExtension->Pdo;
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status = STATUS_SUCCESS;
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return(status);
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}
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NTSTATUS
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PmQueryWmiDataBlock(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp,
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IN ULONG GuidIndex,
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IN ULONG InstanceIndex,
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IN ULONG InstanceCount,
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IN OUT PULONG InstanceLengthArray,
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IN ULONG BufferAvail,
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OUT PUCHAR Buffer
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)
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/*++
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Routine Description:
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This routine is a callback into the driver to query for the contents of
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all instances of a data block. When the driver has finished filling the
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data block it must call WmiCompleteRequest to complete the irp. The
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driver can return STATUS_PENDING if the irp cannot be completed
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immediately.
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Arguments:
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DeviceObject is the device whose data block is being queried
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Irp is the Irp that makes this request
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GuidIndex is the index into the list of guids provided when the
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device registered
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InstanceCount is the number of instnaces expected to be returned for
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the data block.
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InstanceLengthArray is a pointer to an array of ULONG that returns the
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lengths of each instance of the data block. If this is NULL then
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there was not enough space in the output buffer to fufill the request
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so the irp should be completed with the buffer needed.
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BufferAvail on entry has the maximum size available to write the data
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blocks.
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Buffer on return is filled with the returned data blocks. Note that each
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instance of the data block must be aligned on a 8 byte boundry.
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Return Value:
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status
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--*/
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{
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NTSTATUS status;
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PDEVICE_EXTENSION deviceExtension;
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ULONG sizeNeeded = 0;
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KIRQL currentIrql;
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PWCHAR diskNamePtr;
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PAGED_CODE();
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deviceExtension = DeviceObject->DeviceExtension;
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if (GuidIndex == 0)
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{
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if (!(deviceExtension->CountersEnabled)) {
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status = STATUS_UNSUCCESSFUL;
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} else {
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sizeNeeded = ((sizeof(DISK_PERFORMANCE) + 1) & ~1)
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+ deviceExtension->PhysicalDeviceName.Length
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+ sizeof(UNICODE_NULL);
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if (BufferAvail >= sizeNeeded) {
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PmWmiCounterQuery(deviceExtension->PmWmiCounterContext,
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(PDISK_PERFORMANCE) Buffer, L"Partmgr ",
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deviceExtension->DiskNumber);
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diskNamePtr = (PWCHAR)(Buffer +
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((sizeof(DISK_PERFORMANCE) + 1) & ~1));
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*diskNamePtr++ = deviceExtension->PhysicalDeviceName.Length;
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RtlCopyMemory(diskNamePtr,
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deviceExtension->PhysicalDeviceName.Buffer,
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deviceExtension->PhysicalDeviceName.Length);
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*InstanceLengthArray = sizeNeeded;
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status = STATUS_SUCCESS;
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} else {
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status = STATUS_BUFFER_TOO_SMALL;
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}
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}
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} else {
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status = STATUS_WMI_GUID_NOT_FOUND;
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}
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status = WmiCompleteRequest( DeviceObject, Irp, status, sizeNeeded,
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IO_NO_INCREMENT);
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return status;
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}
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BOOLEAN
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PmQueryEnableAlways(
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IN PDEVICE_OBJECT DeviceObject
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)
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{
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NTSTATUS status;
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UNICODE_STRING uString;
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OBJECT_ATTRIBUTES objAttributes;
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PKEY_VALUE_PARTIAL_INFORMATION keyValue;
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ULONG Buffer[4]; // sizeof keyValue + ULONG
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ULONG enableAlways = 0;
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PDEVICE_EXTENSION extension = DeviceObject->DeviceExtension;
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HANDLE keyHandle;
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ULONG returnLength;
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PAGED_CODE();
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RtlInitUnicodeString(&uString, L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Partmgr");
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InitializeObjectAttributes(
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&objAttributes,
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&uString,
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OBJ_CASE_INSENSITIVE,
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NULL,
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NULL
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);
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status = ZwOpenKey(&keyHandle, KEY_READ, &objAttributes);
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if (NT_SUCCESS(status)) {
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RtlInitUnicodeString(&uString, L"EnableCounterForIoctl");
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status = ZwQueryValueKey(keyHandle, &uString,
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KeyValuePartialInformation,
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Buffer,
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sizeof(Buffer),
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&returnLength);
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keyValue = (PKEY_VALUE_PARTIAL_INFORMATION) &Buffer[0];
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if (NT_SUCCESS(status) && (keyValue->DataLength == sizeof(ULONG))) {
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enableAlways = *((PULONG) keyValue->Data);
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}
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ZwClose(keyHandle);
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}
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if (enableAlways == 1) {
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if (InterlockedCompareExchange(&extension->EnableAlways, 1, 0) == 0) {
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status = PmWmiCounterEnable(&extension->PmWmiCounterContext);
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if (NT_SUCCESS(status)) {
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extension->CountersEnabled = TRUE;
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return TRUE;
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}
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else {
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InterlockedExchange(&extension->EnableAlways, 0);
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}
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}
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}
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return FALSE;
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}
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