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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SYSTEM_CPU_CPU_FREQ_ANDROID_H_
#define COMPONENTS_SYSTEM_CPU_CPU_FREQ_ANDROID_H_
#include <limits>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/files/scoped_file.h"
#include "base/types/id_type.h"
namespace system_cpu {
class CPUFreqMonitor {
public:
using CpuId = base::IdType<class CpuIdTag,
unsigned int,
std::numeric_limits<unsigned int>::max()>;
class Delegate {
public:
Delegate() = default;
virtual ~Delegate() = default;
Delegate(const Delegate&) = delete;
Delegate& operator=(const Delegate&) = delete;
// Returns a vector of the minimal set of CPU IDs that we need to monitor to
// get CPU frequency information. For CPUs that operate cores in a cluster,
// i.e. modern Qualcomm 8 cores, this is CPU0 and CPU4.
virtual std::vector<CpuId> GetCPUIds() const;
// Reads the kernel_max_cpu file to determine the max CPU ID, i.e. 7 on an
// 8-core CPU.
virtual CpuId GetKernelMaxCPUId() const;
// Gets the path to CPU frequency related files for a particular CPU ID.
virtual std::string GetScalingCurFreqPathString(CpuId cpu_id) const;
virtual std::string GetRelatedCPUsPathString(CpuId cpu_id) const;
};
CPUFreqMonitor();
explicit CPUFreqMonitor(std::unique_ptr<CPUFreqMonitor::Delegate> delegate);
~CPUFreqMonitor();
struct CoreFrequency {
CpuId core_id;
unsigned int freq;
};
std::vector<CoreFrequency> GetCoreFrequencies() const;
private:
std::unique_ptr<Delegate> delegate_;
std::vector<std::pair<CpuId, base::ScopedFD>> file_descriptors_;
};
} // namespace system_cpu
#endif // COMPONENTS_SYSTEM_CPU_CPU_FREQ_ANDROID_H_
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