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/*
* Copyright (C) 2019-2020 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/helpers/kernel_helpers.h"
#include "shared/source/helpers/basic_math.h"
#include "shared/source/helpers/debug_helpers.h"
#include <algorithm>
namespace NEO {
uint32_t KernelHelper::getMaxWorkGroupCount(uint32_t simd, uint32_t availableThreadCount, uint32_t dssCount, uint32_t availableSlmSize,
uint32_t usedSlmSize, uint32_t maxBarrierCount, uint32_t numberOfBarriers, uint32_t workDim,
const size_t *localWorkSize) {
UNRECOVERABLE_IF((workDim == 0) || (workDim > 3));
UNRECOVERABLE_IF(localWorkSize == nullptr);
size_t workGroupSize = localWorkSize[0];
for (uint32_t i = 1; i < workDim; i++) {
workGroupSize *= localWorkSize[i];
}
auto numThreadsPerThreadGroup = static_cast<uint32_t>(Math::divideAndRoundUp(workGroupSize, simd));
auto maxWorkGroupsCount = availableThreadCount / numThreadsPerThreadGroup;
if (numberOfBarriers > 0) {
auto maxWorkGroupsCountDueToBarrierUsage = dssCount * (maxBarrierCount / numberOfBarriers);
maxWorkGroupsCount = std::min(maxWorkGroupsCount, maxWorkGroupsCountDueToBarrierUsage);
}
if (usedSlmSize > 0) {
auto maxWorkGroupsCountDueToSlm = availableSlmSize / usedSlmSize;
maxWorkGroupsCount = std::min(maxWorkGroupsCount, maxWorkGroupsCountDueToSlm);
}
return maxWorkGroupsCount;
}
} // namespace NEO
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