lib/cpuperf/device_reader.h

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef GARNET_LIB_CPUPERF_DEVICE_READER_H_
#define GARNET_LIB_CPUPERF_DEVICE_READER_H_

#include <lib/fxl/macros.h>
#include <lib/zx/vmar.h>
#include <lib/zx/vmo.h>
#include <lib/zircon-internal/device/cpu-trace/cpu-perf.h>
#include <zircon/types.h>

#include "reader.h"

namespace cpuperf {

class DeviceReader final : public Reader {
 public:
  // |fd| is borrowed.
  static bool Create(int fd, uint32_t buffer_size,
                     std::unique_ptr<DeviceReader>* out_reader);

  ~DeviceReader();

  bool GetProperties(cpuperf_properties_t* props);

  bool GetConfig(cpuperf_config_t* config);

 private:
  // |fd| is borrowed.
  DeviceReader(int fd, uint32_t buffer_size, zx::vmar vmar);

  bool MapBuffer(const std::string& name, uint32_t trace_num) override;
  bool UnmapBuffer() override;

  const int fd_;  // borrowed
  const size_t buffer_size_;
  zx::vmar vmar_;

  const void* buffer_contents_ = nullptr;
  zx::vmo current_vmo_;

  FXL_DISALLOW_COPY_AND_ASSIGN(DeviceReader);
};

}  // namespace cpuperf

#endif  // GARNET_LIB_CPUPERF_DEVICE_READER_H_