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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include "interlocked.h"
#include "queueing.h"
static KSTART_ROUTINE WorkerThread;
_Use_decl_annotations_
static VOID
WorkerThread(PVOID StartContext)
{
MULTICORE_WORKTHREAD *WorkThread = StartContext;
MULTICORE_WORKQUEUE *WorkQueue = WorkThread->WorkQueue;
PMULTICORE_WORKQUEUE_ROUTINE Func = WorkQueue->Func;
GROUP_AFFINITY Affinity = { .Mask = (KAFFINITY)1 << WorkThread->Processor.Number,
.Group = WorkThread->Processor.Group };
KeSetSystemGroupAffinityThread(&Affinity, NULL);
PVOID Handles[] = { &WorkQueue->NewWork, &WorkQueue->Dead };
for (;;)
{
if (KeWaitForMultipleObjects(ARRAYSIZE(Handles), Handles, WaitAny, Executive, KernelMode, FALSE, NULL, NULL) !=
STATUS_WAIT_0)
break;
Func(WorkQueue);
}
}
static KSTART_ROUTINE NewThreadSpawner;
_Use_decl_annotations_
static VOID
NewThreadSpawner(PVOID StartContext)
{
MULTICORE_WORKQUEUE *WorkQueue = StartContext;
OBJECT_ATTRIBUTES ObjectAttributes;
InitializeObjectAttributes(&ObjectAttributes, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
PVOID Handles[] = { &WorkQueue->NewCpus, &WorkQueue->Dead };
for (;;)
{
if (KeWaitForMultipleObjects(ARRAYSIZE(Handles), Handles, WaitAny, Executive, KernelMode, FALSE, NULL, NULL) !=
STATUS_WAIT_0)
break;
for (MULTICORE_WORKTHREAD *Thread = ReadPointerAcquire(&WorkQueue->FirstThread); Thread && !Thread->Thread;
Thread = Thread->NextThread)
{
HANDLE Handle;
if (!NT_SUCCESS(PsCreateSystemThread(
&Handle, THREAD_ALL_ACCESS, &ObjectAttributes, NULL, NULL, WorkerThread, Thread)))
break;
ObReferenceObjectByHandle(Handle, SYNCHRONIZE, NULL, KernelMode, &Thread->Thread, NULL);
ZwClose(Handle);
}
}
}
static PROCESSOR_CALLBACK_FUNCTION NewCpuArrival;
_Use_decl_annotations_
static VOID
NewCpuArrival(PVOID CallbackContext, PKE_PROCESSOR_CHANGE_NOTIFY_CONTEXT ChangeContext, PNTSTATUS OperationStatus)
{
if (ChangeContext->State != KeProcessorAddCompleteNotify)
return;
MULTICORE_WORKQUEUE *WorkQueue = CallbackContext;
MULTICORE_WORKTHREAD *WorkThread = MemAllocateAndZero(sizeof(*WorkThread));
if (!WorkThread)
return;
WorkThread->Processor = ChangeContext->ProcNumber;
WorkThread->NextThread = WorkQueue->FirstThread;
WorkThread->WorkQueue = WorkQueue;
WritePointerRelease(&WorkQueue->FirstThread, WorkThread);
KeSetEvent(&WorkQueue->NewCpus, IO_NETWORK_INCREMENT, FALSE);
}
_Use_decl_annotations_
NTSTATUS
MulticoreWorkQueueInit(MULTICORE_WORKQUEUE *WorkQueue, PMULTICORE_WORKQUEUE_ROUTINE Func)
{
KeInitializeEvent(&WorkQueue->NewWork, SynchronizationEvent, FALSE);
KeInitializeEvent(&WorkQueue->NewCpus, SynchronizationEvent, FALSE);
KeInitializeEvent(&WorkQueue->Dead, NotificationEvent, FALSE);
WorkQueue->FirstThread = NULL;
WorkQueue->Func = Func;
OBJECT_ATTRIBUTES ObjectAttributes;
InitializeObjectAttributes(&ObjectAttributes, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
HANDLE Handle;
NTSTATUS Status =
PsCreateSystemThread(&Handle, THREAD_ALL_ACCESS, &ObjectAttributes, NULL, NULL, NewThreadSpawner, WorkQueue);
if (!NT_SUCCESS(Status))
return Status;
ObReferenceObjectByHandle(Handle, SYNCHRONIZE, NULL, KernelMode, &WorkQueue->WorkerSpawnerThread, NULL);
ZwClose(Handle);
WorkQueue->NewCpuNotifier =
KeRegisterProcessorChangeCallback(NewCpuArrival, WorkQueue, KE_PROCESSOR_CHANGE_ADD_EXISTING);
Status = WorkQueue->NewCpuNotifier ? STATUS_SUCCESS : STATUS_INSUFFICIENT_RESOURCES;
if (!NT_SUCCESS(Status))
MulticoreWorkQueueDestroy(WorkQueue);
return Status;
}
_Use_decl_annotations_
BOOLEAN
MulticoreWorkQueueBump(MULTICORE_WORKQUEUE *WorkQueue)
{
return KeSetEvent(&WorkQueue->NewWork, IO_NETWORK_INCREMENT, FALSE) == 0;
}
_Use_decl_annotations_
VOID
MulticoreWorkQueueDestroy(MULTICORE_WORKQUEUE *WorkQueue)
{
if (WorkQueue->NewCpuNotifier)
KeDeregisterProcessorChangeCallback(WorkQueue->NewCpuNotifier);
KeSetEvent(&WorkQueue->Dead, IO_NETWORK_INCREMENT, FALSE);
KeWaitForSingleObject(WorkQueue->WorkerSpawnerThread, Executive, KernelMode, FALSE, NULL);
ObDereferenceObject(WorkQueue->WorkerSpawnerThread);
PKTHREAD Threads[MAXIMUM_WAIT_OBJECTS];
static_assert(sizeof(Threads) <= 512, "Must move thread handle allocation to heap");
PKWAIT_BLOCK WaitBlock = MemAllocateArray(MAXIMUM_WAIT_OBJECTS, sizeof(KWAIT_BLOCK));
ULONG MaxPerWait = WaitBlock ? MAXIMUM_WAIT_OBJECTS : THREAD_WAIT_OBJECTS;
MULTICORE_WORKTHREAD *Thread = WorkQueue->FirstThread, *Next;
while (Thread)
{
ULONG Count = 0;
for (; Thread; Thread = Thread->NextThread)
{
if (Count >= MaxPerWait)
break;
if (Thread->Thread)
Threads[Count++] = Thread->Thread;
}
KeWaitForMultipleObjects(Count, Threads, WaitAll, Executive, KernelMode, FALSE, NULL, WaitBlock);
}
for (Thread = WorkQueue->FirstThread; Thread; Thread = Next)
{
Next = Thread->NextThread;
if (Thread->Thread)
ObDereferenceObject(Thread->Thread);
MemFree(Thread);
}
MemFree(WaitBlock);
}
#define NEXT(Nbl) NET_BUFFER_LIST_PER_PEER_LIST_LINK(Nbl)
#define STUB(Queue) (&(Queue)->Empty)
_Use_decl_annotations_
VOID
PrevQueueInit(PREV_QUEUE *Queue)
{
NEXT(STUB(Queue)) = NULL;
Queue->Head = Queue->Tail = STUB(Queue);
Queue->Peeked = NULL;
WriteRaw(&Queue->Count, 0);
}
static VOID
__PrevQueueEnqueue(_Inout_ PREV_QUEUE *Queue, _In_ __drv_aliasesMem NET_BUFFER_LIST *Nbl)
{
WritePointerNoFence(&NEXT(Nbl), NULL);
WritePointerNoFence(&NEXT((NET_BUFFER_LIST *)InterlockedExchangePointerRelease(&Queue->Head, Nbl)), Nbl);
}
_Use_decl_annotations_
BOOLEAN
PrevQueueEnqueue(PREV_QUEUE *Queue, NET_BUFFER_LIST *Nbl)
{
if (!InterlockedIncrementUnless(&Queue->Count, MAX_QUEUED_PACKETS))
return FALSE;
__PrevQueueEnqueue(Queue, Nbl);
return TRUE;
}
_Use_decl_annotations_
NET_BUFFER_LIST *
PrevQueueDequeue(PREV_QUEUE *Queue)
{
NET_BUFFER_LIST *Tail = Queue->Tail, *Next = ReadPointerAcquire(&NEXT(Tail));
if (Tail == STUB(Queue))
{
if (!Next)
return NULL;
Queue->Tail = Next;
Tail = Next;
Next = ReadPointerAcquire(&NEXT(Next));
}
if (Next)
{
Queue->Tail = Next;
InterlockedDecrement(&Queue->Count);
return Tail;
}
if (Tail != ReadPointerNoFence(&Queue->Head))
return NULL;
__PrevQueueEnqueue(Queue, STUB(Queue));
Next = ReadPointerAcquire(&NEXT(Tail));
if (Next)
{
Queue->Tail = Next;
InterlockedDecrement(&Queue->Count);
return Tail;
}
return NULL;
}
#undef NEXT
#undef STUB
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