106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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#include "Hal.h"
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#include "HalTypes.h"
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#include "mozilla/BitSet.h"
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#include "nsTArray.h"
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#include <windows.h>
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namespace mozilla::hal_impl {
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static mozilla::Maybe<hal::HeterogeneousCpuInfo> CreateHeterogeneousCpuInfo() {
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ULONG returnedLength;
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GetSystemCpuSetInformation(NULL, 0, &returnedLength, NULL, 0);
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if (!returnedLength) {
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return Nothing();
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}
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AutoTArray<uint8_t, 1024> cpuSets;
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cpuSets.SetLength(returnedLength);
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if (!GetSystemCpuSetInformation(
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reinterpret_cast<SYSTEM_CPU_SET_INFORMATION*>(cpuSets.Elements()),
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returnedLength, &returnedLength, NULL, 0)) {
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return Nothing();
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}
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hal::HeterogeneousCpuInfo info;
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info.mTotalNumCpus = 0;
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BYTE maxEfficiencyClass = 0;
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BYTE minEfficiencyClass = UINT8_MAX;
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size_t currentPosition = 0;
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while (currentPosition < returnedLength) {
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SYSTEM_CPU_SET_INFORMATION& set =
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*reinterpret_cast<SYSTEM_CPU_SET_INFORMATION*>(cpuSets.Elements() +
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currentPosition);
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currentPosition += set.Size;
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if (currentPosition > returnedLength) {
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MOZ_ASSERT(false);
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return Nothing();
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}
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if (set.Type != CpuSetInformation || !set.CpuSet.Id) {
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continue;
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}
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info.mTotalNumCpus += 1;
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maxEfficiencyClass =
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std::max(maxEfficiencyClass, set.CpuSet.EfficiencyClass);
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minEfficiencyClass =
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std::min(minEfficiencyClass, set.CpuSet.EfficiencyClass);
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}
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if (!info.mTotalNumCpus) {
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// This is weird.
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return Nothing();
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}
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currentPosition = 0;
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size_t currentCPU = 0;
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// The API has currently a limit how many cpu cores it can tell about.
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while (currentPosition < returnedLength) {
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if (currentCPU >= 32) {
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break;
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}
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SYSTEM_CPU_SET_INFORMATION& set =
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*reinterpret_cast<SYSTEM_CPU_SET_INFORMATION*>(cpuSets.Elements() +
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currentPosition);
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currentPosition += set.Size;
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// If this happens the code above should already have bailed.
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MOZ_ASSERT(currentPosition <= returnedLength);
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// EfficiencyClass doesn't obviously translate to our model, for now what
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// we are doing is counting everything of 'max' power use as a big core,
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// everything of 'min' power use as a little code, and everything else as
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// medium.
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if (set.CpuSet.EfficiencyClass == maxEfficiencyClass) {
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info.mBigCpus[currentCPU++] = true;
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} else if (set.CpuSet.EfficiencyClass == minEfficiencyClass) {
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info.mLittleCpus[currentCPU++] = true;
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} else {
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info.mMediumCpus[currentCPU++] = true;
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}
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}
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return Some(info);
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}
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const Maybe<hal::HeterogeneousCpuInfo>& GetHeterogeneousCpuInfo() {
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static const Maybe<hal::HeterogeneousCpuInfo> cpuInfo =
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CreateHeterogeneousCpuInfo();
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return cpuInfo;
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}
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} // namespace mozilla::hal_impl
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