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/*
* Copyright (C) 2019-2025 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/page_fault_manager/cpu_page_fault_manager.h"
#include "shared/source/debug_settings/debug_settings_manager.h"
#include "shared/source/helpers/memory_properties_helpers.h"
#include "shared/source/helpers/options.h"
#include "shared/source/memory_manager/unified_memory_manager.h"
#include "shared/source/utilities/spinlock.h"
#include <algorithm>
namespace NEO {
void CpuPageFaultManager::insertAllocation(void *ptr, size_t size, SVMAllocsManager *unifiedMemoryManager, void *cmdQ, const MemoryProperties &memoryProperties) {
auto initialPlacement = MemoryPropertiesHelper::getUSMInitialPlacement(memoryProperties);
const auto domain = (initialPlacement == GraphicsAllocation::UsmInitialPlacement::CPU) ? AllocationDomain::cpu : AllocationDomain::none;
std::unique_lock<RecursiveSpinLock> lock{mtx};
PageFaultData faultData{};
faultData.size = size;
faultData.unifiedMemoryManager = unifiedMemoryManager;
faultData.cmdQ = cmdQ;
faultData.domain = domain;
this->memoryData.insert(std::make_pair(ptr, faultData));
unifiedMemoryManager->nonGpuDomainAllocs.push_back(ptr);
if (initialPlacement != GraphicsAllocation::UsmInitialPlacement::CPU) {
this->protectCPUMemoryAccess(ptr, size);
}
}
void CpuPageFaultManager::removeAllocation(void *ptr) {
std::unique_lock<RecursiveSpinLock> lock{mtx};
auto alloc = memoryData.find(ptr);
if (alloc != memoryData.end()) {
auto &pageFaultData = alloc->second;
if (pageFaultData.domain == AllocationDomain::gpu) {
allowCPUMemoryAccess(ptr, pageFaultData.size);
} else {
auto &cpuAllocs = pageFaultData.unifiedMemoryManager->nonGpuDomainAllocs;
if (auto it = std::find(cpuAllocs.begin(), cpuAllocs.end(), ptr); it != cpuAllocs.end()) {
cpuAllocs.erase(it);
}
}
this->memoryData.erase(ptr);
}
}
void CpuPageFaultManager::moveAllocationToGpuDomain(void *ptr) {
std::unique_lock<RecursiveSpinLock> lock{mtx};
auto alloc = memoryData.find(ptr);
if (alloc != memoryData.end()) {
auto &pageFaultData = alloc->second;
if (pageFaultData.domain == AllocationDomain::cpu || pageFaultData.domain == AllocationDomain::none) {
this->migrateStorageToGpuDomain(ptr, pageFaultData);
auto &cpuAllocs = pageFaultData.unifiedMemoryManager->nonGpuDomainAllocs;
if (auto it = std::find(cpuAllocs.begin(), cpuAllocs.end(), ptr); it != cpuAllocs.end()) {
cpuAllocs.erase(it);
}
}
}
}
void CpuPageFaultManager::moveAllocationsWithinUMAllocsManagerToGpuDomain(SVMAllocsManager *unifiedMemoryManager) {
std::unique_lock<RecursiveSpinLock> lock{mtx};
for (auto allocPtr : unifiedMemoryManager->nonGpuDomainAllocs) {
auto &pageFaultData = this->memoryData[allocPtr];
this->migrateStorageToGpuDomain(allocPtr, pageFaultData);
}
unifiedMemoryManager->nonGpuDomainAllocs.clear();
}
inline void CpuPageFaultManager::migrateStorageToGpuDomain(void *ptr, PageFaultData &pageFaultData) {
if (pageFaultData.domain == AllocationDomain::cpu) {
this->setCpuAllocEvictable(false, ptr, pageFaultData.unifiedMemoryManager);
this->allowCPUMemoryEviction(false, ptr, pageFaultData);
std::chrono::steady_clock::time_point start;
std::chrono::steady_clock::time_point end;
if (debugManager.flags.RegisterPageFaultHandlerOnMigration.get()) {
if (this->checkFaultHandlerFromPageFaultManager() == false) {
this->registerFaultHandler();
}
}
start = std::chrono::steady_clock::now();
this->transferToGpu(ptr, pageFaultData.cmdQ);
end = std::chrono::steady_clock::now();
long long elapsedTime = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start).count();
PRINT_DEBUG_STRING(debugManager.flags.PrintUmdSharedMigration.get(), stdout, "UMD transferred shared allocation 0x%llx (%zu B) from CPU to GPU (%f us)\n", reinterpret_cast<unsigned long long int>(ptr), pageFaultData.size, elapsedTime / 1e3);
this->protectCPUMemoryAccess(ptr, pageFaultData.size);
}
pageFaultData.domain = AllocationDomain::gpu;
}
void CpuPageFaultManager::handlePageFault(void *ptr, PageFaultData &faultData) {
this->setAubWritable(true, ptr, faultData.unifiedMemoryManager);
gpuDomainHandler(this, ptr, faultData);
}
bool CpuPageFaultManager::verifyAndHandlePageFault(void *ptr, bool handleFault) {
std::unique_lock<RecursiveSpinLock> lock{mtx};
auto allocPtr = getFaultData(memoryData, ptr, handleFault);
if (allocPtr == nullptr) {
return false;
}
if (handleFault) {
handlePageFault(allocPtr, memoryData[allocPtr]);
}
return true;
}
void CpuPageFaultManager::setGpuDomainHandler(gpuDomainHandlerFunc gpuHandlerFuncPtr) {
this->gpuDomainHandler = gpuHandlerFuncPtr;
}
void CpuPageFaultManager::transferAndUnprotectMemory(CpuPageFaultManager *pageFaultHandler, void *allocPtr, PageFaultData &pageFaultData) {
pageFaultHandler->migrateStorageToCpuDomain(allocPtr, pageFaultData);
pageFaultHandler->allowCPUMemoryAccess(allocPtr, pageFaultData.size);
pageFaultHandler->setCpuAllocEvictable(true, allocPtr, pageFaultData.unifiedMemoryManager);
pageFaultHandler->allowCPUMemoryEviction(true, allocPtr, pageFaultData);
}
void CpuPageFaultManager::unprotectAndTransferMemory(CpuPageFaultManager *pageFaultHandler, void *allocPtr, PageFaultData &pageFaultData) {
pageFaultHandler->allowCPUMemoryAccess(allocPtr, pageFaultData.size);
pageFaultHandler->migrateStorageToCpuDomain(allocPtr, pageFaultData);
}
inline void CpuPageFaultManager::migrateStorageToCpuDomain(void *ptr, PageFaultData &pageFaultData) {
if (pageFaultData.domain == AllocationDomain::gpu) {
std::chrono::steady_clock::time_point start;
std::chrono::steady_clock::time_point end;
start = std::chrono::steady_clock::now();
this->transferToCpu(ptr, pageFaultData.size, pageFaultData.cmdQ);
end = std::chrono::steady_clock::now();
long long elapsedTime = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start).count();
PRINT_DEBUG_STRING(debugManager.flags.PrintUmdSharedMigration.get(), stdout, "UMD transferred shared allocation 0x%llx (%zu B) from GPU to CPU (%f us)\n", reinterpret_cast<unsigned long long int>(ptr), pageFaultData.size, elapsedTime / 1e3);
pageFaultData.unifiedMemoryManager->nonGpuDomainAllocs.push_back(ptr);
}
pageFaultData.domain = AllocationDomain::cpu;
}
void CpuPageFaultManager::selectGpuDomainHandler() {
if (debugManager.flags.SetCommandStreamReceiver.get() > static_cast<int32_t>(CommandStreamReceiverType::hardware) || debugManager.flags.NEO_CAL_ENABLED.get()) {
this->gpuDomainHandler = &CpuPageFaultManager::unprotectAndTransferMemory;
}
}
void CpuPageFaultManager::setAubWritable(bool writable, void *ptr, SVMAllocsManager *unifiedMemoryManager) {
UNRECOVERABLE_IF(ptr == nullptr);
auto gpuAlloc = unifiedMemoryManager->getSVMAlloc(ptr)->gpuAllocations.getDefaultGraphicsAllocation();
gpuAlloc->setAubWritable(writable, GraphicsAllocation::allBanks);
}
void CpuPageFaultManager::setCpuAllocEvictable(bool evictable, void *ptr, SVMAllocsManager *unifiedMemoryManager) {
UNRECOVERABLE_IF(ptr == nullptr);
auto cpuAlloc = unifiedMemoryManager->getSVMAlloc(ptr)->cpuAllocation;
cpuAlloc->setEvictable(evictable);
}
} // namespace NEO
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