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/*
* Copyright (C) 2018-2025 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/command_stream/preemption.h"
#include "shared/source/command_stream/linear_stream.h"
#include "shared/source/command_stream/preemption_mode.h"
#include "shared/source/debug_settings/debug_settings_manager.h"
#include "shared/source/device/device.h"
#include "shared/source/execution_environment/root_device_environment.h"
#include "shared/source/helpers/hw_info.h"
#include "shared/source/helpers/string.h"
#include "shared/source/kernel/kernel_descriptor.h"
#include "shared/source/release_helper/release_helper.h"
namespace NEO {
bool PreemptionHelper::allowThreadGroupPreemption(const PreemptionFlags &flags) {
if (flags.flags.disablePerCtxtPreemptionGranularityControl) {
return false;
}
if (flags.flags.usesFencesForReadWriteImages &&
flags.flags.disableLSQCROPERFforOCL) {
return false;
}
return true;
}
bool PreemptionHelper::allowMidThreadPreemption(const PreemptionFlags &flags) {
return flags.flags.disabledMidThreadPreemptionKernel == 0;
}
PreemptionMode PreemptionHelper::taskPreemptionMode(PreemptionMode devicePreemptionMode, const PreemptionFlags &flags) {
if (debugManager.flags.ForceKernelPreemptionMode.get() != -1) {
return static_cast<PreemptionMode>(debugManager.flags.ForceKernelPreemptionMode.get());
}
if (devicePreemptionMode == PreemptionMode::Disabled) {
return PreemptionMode::Disabled;
}
if (devicePreemptionMode >= PreemptionMode::MidThread &&
allowMidThreadPreemption(flags)) {
return PreemptionMode::MidThread;
}
if (devicePreemptionMode >= PreemptionMode::ThreadGroup &&
allowThreadGroupPreemption(flags)) {
return PreemptionMode::ThreadGroup;
}
return PreemptionMode::MidBatch;
};
void PreemptionHelper::adjustDefaultPreemptionMode(RuntimeCapabilityTable &deviceCapabilities, bool allowMidThread, bool allowThreadGroup, bool allowMidBatch) {
if (deviceCapabilities.defaultPreemptionMode >= PreemptionMode::MidThread &&
allowMidThread) {
deviceCapabilities.defaultPreemptionMode = PreemptionMode::MidThread;
} else if (deviceCapabilities.defaultPreemptionMode >= PreemptionMode::ThreadGroup &&
allowThreadGroup) {
deviceCapabilities.defaultPreemptionMode = PreemptionMode::ThreadGroup;
} else if (deviceCapabilities.defaultPreemptionMode >= PreemptionMode::MidBatch &&
allowMidBatch) {
deviceCapabilities.defaultPreemptionMode = PreemptionMode::MidBatch;
} else {
deviceCapabilities.defaultPreemptionMode = PreemptionMode::Disabled;
}
}
PreemptionMode PreemptionHelper::getDefaultPreemptionMode(const HardwareInfo &hwInfo) {
return debugManager.flags.ForcePreemptionMode.get() == -1
? hwInfo.capabilityTable.defaultPreemptionMode
: static_cast<PreemptionMode>(debugManager.flags.ForcePreemptionMode.get());
}
PreemptionFlags PreemptionHelper::createPreemptionLevelFlags(Device &device, const KernelDescriptor *kernelDescriptor) {
PreemptionFlags flags = {};
if (kernelDescriptor) {
flags.flags.disabledMidThreadPreemptionKernel = kernelDescriptor->kernelAttributes.flags.requiresDisabledMidThreadPreemption;
flags.flags.usesFencesForReadWriteImages = kernelDescriptor->kernelAttributes.flags.usesFencesForReadWriteImages;
}
flags.flags.disablePerCtxtPreemptionGranularityControl = device.getHardwareInfo().workaroundTable.flags.waDisablePerCtxtPreemptionGranularityControl;
flags.flags.disableLSQCROPERFforOCL = device.getHardwareInfo().workaroundTable.flags.waDisableLSQCROPERFforOCL;
return flags;
}
} // namespace NEO
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