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reactos/ntoskrnl/io/pnpmgr/pnpnotify.c
Victor Perevertkin 582ca68696
[NTOS:PNP] Improve and refactor PnP notifications 
- BUGFIX: do not call IoGetRelatedTargetDevice while guarded mutex is acquired
  (the function issues an APC, but they are disabled inside a critical section)
- BUGFIX: only the beginning of a structure for GUID_PNP_CUSTOM_NOTIFICATION was copied and queued.
  Just pass it as-is to a subscriber, without copying
- Don't convert event GUID to string, store and compare GUID struct itself
- Split IopNotifyPlugPlayNotification into 3 functions for each type of notification
  (less stack usage and for future changes)
- Move initialization code for notifications into a separate routine
- Use separate lists and locks for every type of notification
- Put "TargetDeviceChange" notifications into their place inside DEVICE_NODE
2020-12-05 22:25:40 +03:00

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/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
* PURPOSE: Plug & Play notification functions
* COPYRIGHT: Copyright 2003 Filip Navara <xnavara@volny.cz>
* Copyright 2005-2006 Hervé Poussineau <hpoussin@reactos.org>
* Copyright 2010 Pierre Schweitzer <pierre@reactos.org>
* Copyright 2020 Victor Perevertkin <victor.perevertkin@reactos.org>
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
/* DATA **********************************************************************/
KGUARDED_MUTEX PiNotifyTargetDeviceLock;
KGUARDED_MUTEX PiNotifyHwProfileLock;
KGUARDED_MUTEX PiNotifyDeviceInterfaceLock;
_Guarded_by_(PiNotifyHwProfileLock)
LIST_ENTRY PiNotifyHwProfileListHead;
_Guarded_by_(PiNotifyDeviceInterfaceLock)
LIST_ENTRY PiNotifyDeviceInterfaceListHead;
/* TYPES *********************************************************************/
typedef struct _PNP_NOTIFY_ENTRY
{
LIST_ENTRY PnpNotifyList;
PVOID Context;
PDRIVER_OBJECT DriverObject;
PDRIVER_NOTIFICATION_CALLBACK_ROUTINE PnpNotificationProc;
union
{
GUID Guid; // for EventCategoryDeviceInterfaceChange
struct
{
PFILE_OBJECT FileObject; // for EventCategoryTargetDeviceChange
PDEVICE_OBJECT DeviceObject;
};
};
IO_NOTIFICATION_EVENT_CATEGORY EventCategory;
UINT8 RefCount;
BOOLEAN Deleted;
} PNP_NOTIFY_ENTRY, *PPNP_NOTIFY_ENTRY;
/* FUNCTIONS *****************************************************************/
CODE_SEG("INIT")
VOID
PiInitializeNotifications(VOID)
{
KeInitializeGuardedMutex(&PiNotifyTargetDeviceLock);
KeInitializeGuardedMutex(&PiNotifyHwProfileLock);
KeInitializeGuardedMutex(&PiNotifyDeviceInterfaceLock);
InitializeListHead(&PiNotifyHwProfileListHead);
InitializeListHead(&PiNotifyDeviceInterfaceListHead);
}
static
CODE_SEG("PAGE")
VOID
PiDereferencePnpNotifyEntry(
_In_ PPNP_NOTIFY_ENTRY Entry)
{
PAGED_CODE();
ASSERT(Entry->RefCount > 0);
ObDereferenceObject(Entry->DriverObject);
Entry->RefCount--;
if (Entry->RefCount == 0)
{
ASSERT(Entry->Deleted);
RemoveEntryList(&Entry->PnpNotifyList);
if (Entry->EventCategory == EventCategoryTargetDeviceChange)
{
// IopGetRelatedTargetDevice referenced the device upon the notification registration
ObDereferenceObject(Entry->DeviceObject);
}
ExFreePoolWithTag(Entry, TAG_PNP_NOTIFY);
}
}
static
CODE_SEG("PAGE")
VOID
PiReferencePnpNotifyEntry(
_In_ PPNP_NOTIFY_ENTRY Entry)
{
PAGED_CODE();
ObReferenceObject(Entry->DriverObject);
Entry->RefCount++;
}
/**
* @brief Calls PnP notification routine and makes some checks to detect faulty drivers
*/
static
CODE_SEG("PAGE")
VOID
PiCallNotifyProc(
_In_ PDRIVER_NOTIFICATION_CALLBACK_ROUTINE Proc,
_In_ PVOID NotificationStructure,
_In_ PVOID Context)
{
PAGED_CODE();
#if DBG
KIRQL oldIrql = KeGetCurrentIrql();
ULONG oldApcDisable = KeGetCurrentThread()->CombinedApcDisable;
#endif
Proc(NotificationStructure, Context);
ASSERT(oldIrql == KeGetCurrentIrql() &&
oldApcDisable == KeGetCurrentThread()->CombinedApcDisable);
}
static
CODE_SEG("PAGE")
_Requires_lock_held_(Lock)
VOID
PiProcessSingleNotification(
_In_ PPNP_NOTIFY_ENTRY Entry,
_In_ PVOID NotificationStructure,
_In_ PKGUARDED_MUTEX Lock,
_Out_ PLIST_ENTRY *NextEntry)
{
PAGED_CODE();
// the notification may be unregistered inside the procedure
// thus reference the entry so we may proceed
PiReferencePnpNotifyEntry(Entry);
// release the lock because the notification routine has to be called without any
// limitations regarding APCs
KeReleaseGuardedMutex(Lock);
PiCallNotifyProc(Entry->PnpNotificationProc, NotificationStructure, Entry->Context);
KeAcquireGuardedMutex(Lock);
// take the next entry link only after the callback finishes
// the lock is not held there, so Entry may have changed at this point
*NextEntry = Entry->PnpNotifyList.Flink;
PiDereferencePnpNotifyEntry(Entry);
}
/**
* @brief Delivers the event to all drivers subscribed to
* EventCategoryDeviceInterfaceChange
*
* @param[in] Event The PnP event GUID
* @param[in] InterfaceClassGuid The GUID of an interface class
* @param[in] SymbolicLinkName Pointer to a string identifying the device interface name
*/
CODE_SEG("PAGE")
VOID
PiNotifyDeviceInterfaceChange(
_In_ LPCGUID Event,
_In_ LPCGUID InterfaceClassGuid,
_In_ PUNICODE_STRING SymbolicLinkName)
{
PAGED_CODE();
PDEVICE_INTERFACE_CHANGE_NOTIFICATION notifyStruct;
notifyStruct = ExAllocatePoolWithTag(PagedPool, sizeof(*notifyStruct), TAG_PNP_NOTIFY);
if (!notifyStruct)
{
return;
}
*notifyStruct = (DEVICE_INTERFACE_CHANGE_NOTIFICATION) {
.Version = 1,
.Size = sizeof(DEVICE_INTERFACE_CHANGE_NOTIFICATION),
.Event = *Event,
.InterfaceClassGuid = *InterfaceClassGuid,
.SymbolicLinkName = SymbolicLinkName
};
DPRINT("Delivering a DeviceInterfaceChange PnP event\n");
KeAcquireGuardedMutex(&PiNotifyDeviceInterfaceLock);
PLIST_ENTRY entry = PiNotifyDeviceInterfaceListHead.Flink;
while (entry != &PiNotifyDeviceInterfaceListHead)
{
PPNP_NOTIFY_ENTRY nEntry = CONTAINING_RECORD(entry, PNP_NOTIFY_ENTRY, PnpNotifyList);
if (!IsEqualGUID(&notifyStruct->InterfaceClassGuid, &nEntry->Guid))
{
entry = entry->Flink;
continue;
}
PiProcessSingleNotification(nEntry, notifyStruct, &PiNotifyDeviceInterfaceLock, &entry);
}
KeReleaseGuardedMutex(&PiNotifyDeviceInterfaceLock);
ExFreePoolWithTag(notifyStruct, TAG_PNP_NOTIFY);
}
/**
* @brief Delivers the event to all drivers subscribed to
* EventCategoryHardwareProfileChange PnP event
*
* @param[in] Event The PnP event GUID
*/
CODE_SEG("PAGE")
VOID
PiNotifyHardwareProfileChange(
_In_ LPCGUID Event)
{
PAGED_CODE();
PHWPROFILE_CHANGE_NOTIFICATION notifyStruct;
notifyStruct = ExAllocatePoolWithTag(PagedPool, sizeof(*notifyStruct), TAG_PNP_NOTIFY);
if (!notifyStruct)
{
return;
}
*notifyStruct = (HWPROFILE_CHANGE_NOTIFICATION) {
.Version = 1,
.Size = sizeof(HWPROFILE_CHANGE_NOTIFICATION),
.Event = *Event
};
DPRINT("Delivering a HardwareProfileChange PnP event\n");
KeAcquireGuardedMutex(&PiNotifyHwProfileLock);
PLIST_ENTRY entry = PiNotifyHwProfileListHead.Flink;
while (entry != &PiNotifyHwProfileListHead)
{
PPNP_NOTIFY_ENTRY nEntry = CONTAINING_RECORD(entry, PNP_NOTIFY_ENTRY, PnpNotifyList);
PiProcessSingleNotification(nEntry, notifyStruct, &PiNotifyHwProfileLock, &entry);
}
KeReleaseGuardedMutex(&PiNotifyHwProfileLock);
ExFreePoolWithTag(notifyStruct, TAG_PNP_NOTIFY);
}
/**
* @brief Delivers the event to all drivers subscribed to
* EventCategoryTargetDeviceChange PnP event
*
* @param[in] Event The PnP event GUID
* @param[in] DeviceObject The (target) device object
* @param[in] CustomNotification Pointer to a custom notification for GUID_PNP_CUSTOM_NOTIFICATION
*/
CODE_SEG("PAGE")
VOID
PiNotifyTargetDeviceChange(
_In_ LPCGUID Event,
_In_ PDEVICE_OBJECT DeviceObject,
_In_opt_ PTARGET_DEVICE_CUSTOM_NOTIFICATION CustomNotification)
{
PAGED_CODE();
PVOID notificationStruct;
// just in case our device is removed during the operation
ObReferenceObject(DeviceObject);
PDEVICE_NODE deviceNode = IopGetDeviceNode(DeviceObject);
ASSERT(deviceNode);
if (!IsEqualGUID(Event, &GUID_PNP_CUSTOM_NOTIFICATION))
{
PTARGET_DEVICE_REMOVAL_NOTIFICATION notifStruct;
notifStruct = ExAllocatePoolWithTag(PagedPool, sizeof(*notifStruct), TAG_PNP_NOTIFY);
if (!notifStruct)
{
return;
}
*notifStruct = (TARGET_DEVICE_REMOVAL_NOTIFICATION) {
.Version = 1,
.Size = sizeof(TARGET_DEVICE_REMOVAL_NOTIFICATION),
.Event = *Event
};
notificationStruct = notifStruct;
DPRINT("Delivering a (non-custom) TargetDeviceChange PnP event\n");
}
else
{
ASSERT(CustomNotification);
// assuming everythng else is correct
notificationStruct = CustomNotification;
DPRINT("Delivering a (custom) TargetDeviceChange PnP event\n");
}
KeAcquireGuardedMutex(&PiNotifyTargetDeviceLock);
PLIST_ENTRY entry = deviceNode->TargetDeviceNotify.Flink;
while (entry != &deviceNode->TargetDeviceNotify)
{
PPNP_NOTIFY_ENTRY nEntry = CONTAINING_RECORD(entry, PNP_NOTIFY_ENTRY, PnpNotifyList);
// put the file object from our saved entry to this particular notification's struct
((PTARGET_DEVICE_REMOVAL_NOTIFICATION)notificationStruct)->FileObject = nEntry->FileObject;
// so you don't need to look at the definition ;)
C_ASSERT(FIELD_OFFSET(TARGET_DEVICE_REMOVAL_NOTIFICATION, FileObject)
== FIELD_OFFSET(TARGET_DEVICE_CUSTOM_NOTIFICATION, FileObject));
PiProcessSingleNotification(nEntry, notificationStruct, &PiNotifyTargetDeviceLock, &entry);
}
KeReleaseGuardedMutex(&PiNotifyTargetDeviceLock);
ExFreePoolWithTag(notificationStruct, TAG_PNP_NOTIFY);
ObDereferenceObject(DeviceObject);
}
/* PUBLIC FUNCTIONS **********************************************************/
/*
* @unimplemented
*/
ULONG
NTAPI
IoPnPDeliverServicePowerNotification(
_In_ ULONG VetoedPowerOperation,
_In_ ULONG PowerNotificationCode,
_In_ ULONG PowerNotificationData,
_In_ BOOLEAN Synchronous)
{
UNIMPLEMENTED;
return 0;
}
/*
* @implemented
*/
CODE_SEG("PAGE")
NTSTATUS
NTAPI
IoRegisterPlugPlayNotification(
_In_ IO_NOTIFICATION_EVENT_CATEGORY EventCategory,
_In_ ULONG EventCategoryFlags,
_In_opt_ PVOID EventCategoryData,
_In_ PDRIVER_OBJECT DriverObject,
_In_ PDRIVER_NOTIFICATION_CALLBACK_ROUTINE CallbackRoutine,
_Inout_opt_ PVOID Context,
_Out_ PVOID *NotificationEntry)
{
PPNP_NOTIFY_ENTRY Entry;
PWSTR SymbolicLinkList;
NTSTATUS Status;
PAGED_CODE();
DPRINT("%s(EventCategory 0x%x, EventCategoryFlags 0x%lx, DriverObject %p) called.\n",
__FUNCTION__, EventCategory, EventCategoryFlags, DriverObject);
ObReferenceObject(DriverObject);
/* Try to allocate entry for notification before sending any notification */
Entry = ExAllocatePoolWithTag(PagedPool, sizeof(PNP_NOTIFY_ENTRY), TAG_PNP_NOTIFY);
if (!Entry)
{
DPRINT("ExAllocatePool() failed\n");
ObDereferenceObject(DriverObject);
return STATUS_INSUFFICIENT_RESOURCES;
}
*Entry = (PNP_NOTIFY_ENTRY) {
.PnpNotificationProc = CallbackRoutine,
.Context = Context,
.DriverObject = DriverObject,
.EventCategory = EventCategory,
.RefCount = 1
};
switch (EventCategory)
{
case EventCategoryDeviceInterfaceChange:
{
Entry->Guid = *(LPGUID)EventCategoryData;
// first register the notification
KeAcquireGuardedMutex(&PiNotifyDeviceInterfaceLock);
InsertTailList(&PiNotifyDeviceInterfaceListHead, &Entry->PnpNotifyList);
KeReleaseGuardedMutex(&PiNotifyDeviceInterfaceLock);
// then process existing interfaces if asked
if (EventCategoryFlags & PNPNOTIFY_DEVICE_INTERFACE_INCLUDE_EXISTING_INTERFACES)
{
DEVICE_INTERFACE_CHANGE_NOTIFICATION NotificationInfos;
UNICODE_STRING SymbolicLinkU;
PWSTR SymbolicLink;
Status = IoGetDeviceInterfaces((LPGUID)EventCategoryData,
NULL, /* PhysicalDeviceObject OPTIONAL */
0, /* Flags */
&SymbolicLinkList);
if (NT_SUCCESS(Status))
{
/* Enumerate SymbolicLinkList */
NotificationInfos.Version = 1;
NotificationInfos.Size = sizeof(DEVICE_INTERFACE_CHANGE_NOTIFICATION);
NotificationInfos.Event = GUID_DEVICE_INTERFACE_ARRIVAL;
NotificationInfos.InterfaceClassGuid = *(LPGUID)EventCategoryData;
NotificationInfos.SymbolicLinkName = &SymbolicLinkU;
for (SymbolicLink = SymbolicLinkList;
*SymbolicLink;
SymbolicLink += (SymbolicLinkU.Length / sizeof(WCHAR)) + 1)
{
RtlInitUnicodeString(&SymbolicLinkU, SymbolicLink);
DPRINT("Calling callback routine for %S\n", SymbolicLink);
PiCallNotifyProc(CallbackRoutine, &NotificationInfos, Context);
}
ExFreePool(SymbolicLinkList);
}
}
break;
}
case EventCategoryHardwareProfileChange:
{
KeAcquireGuardedMutex(&PiNotifyHwProfileLock);
InsertTailList(&PiNotifyHwProfileListHead, &Entry->PnpNotifyList);
KeReleaseGuardedMutex(&PiNotifyHwProfileLock);
break;
}
case EventCategoryTargetDeviceChange:
{
PDEVICE_NODE deviceNode;
Entry->FileObject = (PFILE_OBJECT)EventCategoryData;
// NOTE: the device node's PDO is referenced here
Status = IopGetRelatedTargetDevice(Entry->FileObject, &deviceNode);
if (!NT_SUCCESS(Status))
{
ObDereferenceObject(DriverObject);
ExFreePoolWithTag(Entry, TAG_PNP_NOTIFY);
return Status;
}
// save it so we can dereference it later
Entry->DeviceObject = deviceNode->PhysicalDeviceObject;
// each DEVICE_NODE has its own registered notifications list
KeAcquireGuardedMutex(&PiNotifyTargetDeviceLock);
InsertTailList(&deviceNode->TargetDeviceNotify, &Entry->PnpNotifyList);
KeReleaseGuardedMutex(&PiNotifyTargetDeviceLock);
break;
}
default:
{
DPRINT1("%s: unknown EventCategory 0x%x UNIMPLEMENTED\n",
__FUNCTION__, EventCategory);
ObDereferenceObject(DriverObject);
ExFreePoolWithTag(Entry, TAG_PNP_NOTIFY);
return STATUS_NOT_SUPPORTED;
}
}
DPRINT("%s returns NotificationEntry %p\n", __FUNCTION__, Entry);
*NotificationEntry = Entry;
return STATUS_SUCCESS;
}
/*
* @implemented
*/
CODE_SEG("PAGE")
NTSTATUS
NTAPI
IoUnregisterPlugPlayNotification(
_In_ PVOID NotificationEntry)
{
PPNP_NOTIFY_ENTRY Entry = NotificationEntry;
PKGUARDED_MUTEX Lock;
PAGED_CODE();
DPRINT("%s(NotificationEntry %p) called\n", __FUNCTION__, Entry);
switch (Entry->EventCategory)
{
case EventCategoryDeviceInterfaceChange:
Lock = &PiNotifyDeviceInterfaceLock;
break;
case EventCategoryHardwareProfileChange:
Lock = &PiNotifyHwProfileLock;
break;
case EventCategoryTargetDeviceChange:
Lock = &PiNotifyTargetDeviceLock;
break;
default:
UNREACHABLE;
return STATUS_NOT_SUPPORTED;
}
KeAcquireGuardedMutex(Lock);
if (!Entry->Deleted)
{
Entry->Deleted = TRUE; // so it can't be unregistered two times
PiDereferencePnpNotifyEntry(Entry);
}
else
{
DPRINT1("IoUnregisterPlugPlayNotification called two times for 0x%p\n", NotificationEntry);
}
KeReleaseGuardedMutex(Lock);
return STATUS_SUCCESS;
}
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