1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "content/browser/power_profiler/power_data_provider_ia_win.h"
6
7#include "base/basictypes.h"
8#include "base/logging.h"
9
10namespace content {
11
12// Default sampling period, as recommended by Intel Power Gadget.
13// Section 3.1 of
14// http://software.intel.com/en-us/blogs/2013/10/03/using-the-intel-power-gadget-api-on-windows
15const int kDefaultSamplePeriodMs = 50;
16
17scoped_ptr<PowerDataProvider> PowerDataProvider::Create() {
18  scoped_ptr<PowerDataProviderIA> provider(new PowerDataProviderIA());
19  if (provider->Initialize())
20    return make_scoped_ptr<PowerDataProvider>(provider.release());
21
22  return make_scoped_ptr<PowerDataProvider>(NULL);
23}
24
25PowerDataProviderIA::PowerDataProviderIA()
26    : sockets_number_(0),
27      is_open_(false) {
28  for (int i = 0; i < PowerEvent::ID_COUNT; i++ )
29      power_msr_ids_[i] = -1;
30}
31
32PowerDataProviderIA::~PowerDataProviderIA() {
33}
34
35PowerEventVector PowerDataProviderIA::GetData() {
36  PowerEventVector events;
37
38  if (!energy_lib_.ReadSample())
39    return events;
40
41  PowerEvent event;
42  double package_power = 0.0;
43  double power[3];
44  int data_count;
45
46  for (int i = 0; i < sockets_number_; i++) {
47    if (power_msr_ids_[PowerEvent::SOC_PACKAGE] == -1)
48      break;
49
50    energy_lib_.GetPowerData(i,
51        power_msr_ids_[PowerEvent::SOC_PACKAGE], power, &data_count);
52    package_power += power[0];
53  }
54
55  event.type = PowerEvent::SOC_PACKAGE;
56  event.value = package_power;
57  event.time = base::TimeTicks::Now();
58  events.push_back(event);
59
60  return events;
61}
62
63base::TimeDelta PowerDataProviderIA::GetSamplingRate() {
64  return base::TimeDelta::FromMilliseconds(kDefaultSamplePeriodMs);
65}
66
67bool PowerDataProviderIA::Initialize() {
68  if (is_open_)
69    return true;
70
71  if (!energy_lib_.IntelEnergyLibInitialize()) {
72    LOG(ERROR) << "Power Data Provider initialize failed!";
73    return false;
74  }
75
76  energy_lib_.GetNumNodes(&sockets_number_);
77
78  const std::wstring package_msr_name = L"Processor";
79
80  int msr_number;
81  energy_lib_.GetNumMsrs(&msr_number);
82
83  int func_id;
84  wchar_t name[32];
85  for(int i = 0; i < msr_number; i++) {
86    energy_lib_.GetMsrFunc(i, &func_id);
87    energy_lib_.GetMsrName(i, name);
88
89    if (func_id != 1)
90      continue;
91
92    if (package_msr_name.compare(name) == 0)
93      power_msr_ids_[PowerEvent::SOC_PACKAGE] = i;
94  }
95
96  is_open_ = true;
97  return true;
98}
99
100}  // namespace content
101