1 // Copyright 2023 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "components/power_metrics/energy_metrics_provider_win.h"
10 #include <initguid.h> // This has to be before emi.h
15 #include "base/logging.h"
16 #include "base/memory/free_deleter.h"
17 #include "base/memory/ptr_util.h"
18 #include "base/threading/scoped_blocking_call.h"
19 #include "base/win/scoped_devinfo.h"
20 #include "base/win/scoped_handle.h"
22 namespace power_metrics {
26 // Windows EMI interface provides energy data in units of picowatt-hour.
27 constexpr double kNanojoulesPerPicowattHour = 3.6;
29 // These metrics are hardware dependent. "RAPL" metrics are from Intel
30 // Running Average Power Limit (RAPL) interface, and the rest are from AMD.
31 // Here, we only consider single-socket system, where "Package0" means that the
32 // metered hardware are in the same package 0, "PP0" usually stands for cores,
33 // and "PP1" usually stands for integrated GPU. There should also be "Package1"
34 // or more packages for more than one socket system, which needs more tests to
36 void SetEnergyMetric(const std::wstring& metric_type,
37 EnergyMetricsProvider::EnergyMetrics& energy_metrics,
38 uint64_t absolute_energy) {
39 if (metric_type == L"RAPL_Package0_PKG") {
40 energy_metrics.package_nanojoules = absolute_energy;
41 } else if (metric_type == L"RAPL_Package0_PP0") {
42 energy_metrics.cpu_nanojoules = absolute_energy;
43 } else if (metric_type == L"RAPL_Package0_PP1") {
44 energy_metrics.gpu_nanojoules = absolute_energy;
45 } else if (metric_type == L"RAPL_Package0_DRAM") {
46 energy_metrics.dram_nanojoules = absolute_energy;
47 } else if (metric_type == L"VDDCR_VDD Energy") {
48 energy_metrics.vdd_nanojoules = absolute_energy;
49 } else if (metric_type == L"VDDCR_SOC Energy") {
50 energy_metrics.soc_nanojoules = absolute_energy;
51 } else if (metric_type == L"Current Socket Energy") {
52 energy_metrics.socket_nanojoules = absolute_energy;
53 } else if (metric_type == L"Apu Energy") {
54 energy_metrics.apu_nanojoules = absolute_energy;
60 EnergyMetricsProviderWin::EnergyMetricsProviderWin() = default;
61 EnergyMetricsProviderWin::~EnergyMetricsProviderWin() = default;
64 std::unique_ptr<EnergyMetricsProviderWin> EnergyMetricsProviderWin::Create() {
65 return base::WrapUnique(new EnergyMetricsProviderWin());
68 absl::optional<EnergyMetricsProvider::EnergyMetrics>
69 EnergyMetricsProviderWin::CaptureMetrics() {
75 base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
76 base::BlockingType::MAY_BLOCK);
78 DWORD bytes_returned = 0;
79 std::vector<EMI_CHANNEL_MEASUREMENT_DATA> measurement_data(
80 metric_types_.size());
81 const size_t measurement_data_size_bytes =
82 sizeof(EMI_CHANNEL_MEASUREMENT_DATA) * metric_types_.size();
83 // Get the EMI measurement data.
84 if (!DeviceIoControl(handle_.get(), IOCTL_EMI_GET_MEASUREMENT, nullptr, 0,
85 measurement_data.data(), measurement_data_size_bytes,
86 &bytes_returned, nullptr)) {
87 PLOG(ERROR) << "IOCTL_EMI_GET_MEASUREMENT failed";
90 CHECK_EQ(bytes_returned, measurement_data_size_bytes);
92 EnergyMetrics energy_metrics = {0};
93 for (size_t i = 0; i < metric_types_.size(); ++i) {
94 EMI_CHANNEL_MEASUREMENT_DATA* channel_data = &measurement_data[i];
95 uint64_t absolute_energy = static_cast<uint64_t>(
96 kNanojoulesPerPicowattHour * channel_data->AbsoluteEnergy);
97 SetEnergyMetric(metric_types_[i], energy_metrics, absolute_energy);
99 return energy_metrics;
102 bool EnergyMetricsProviderWin::Initialize() {
103 if (is_initialized_) {
104 if (metric_types_.empty()) {
110 is_initialized_ = true;
111 base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
112 base::BlockingType::MAY_BLOCK);
114 // Energy Meter Interface
115 // {45BD8344-7ED6-49cf-A440-C276C933B053}
116 // https://learn.microsoft.com/en-us/windows-hardware/drivers/powermeter/energy-meter-interface
118 // Get device information set for the Energy Meter Interface.
119 base::win::ScopedDevInfo dev_info(
120 SetupDiGetClassDevs(&GUID_DEVICE_ENERGY_METER, nullptr, nullptr,
121 DIGCF_PRESENT | DIGCF_DEVICEINTERFACE));
122 if (!dev_info.is_valid()) {
123 PLOG(WARNING) << "SetupDiGetClassDevs";
127 // Pick the first device interface in the returned device information set.
129 // TODO(crbug.com/1385251): Determine if the first device interface is always
131 SP_DEVICE_INTERFACE_DATA dev_data = {0};
132 dev_data.cbSize = sizeof(dev_data);
133 if (!SetupDiEnumDeviceInterfaces(dev_info.get(), nullptr,
134 &GUID_DEVICE_ENERGY_METER, 0, &dev_data)) {
135 PLOG(WARNING) << "SetupDiEnumDeviceInterfaces";
139 // Get the required size of device interface detail data.
140 DWORD required_size = 0;
141 if (SetupDiGetDeviceInterfaceDetail(dev_info.get(), &dev_data, nullptr, 0,
142 &required_size, nullptr) ||
143 ::GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
147 // Get the pointer to an SP_DEVICE_INTERFACE_DETAIL_DATA structure to
148 // receive information.
149 std::unique_ptr<SP_DEVICE_INTERFACE_DETAIL_DATA, base::FreeDeleter>
151 static_cast<SP_DEVICE_INTERFACE_DETAIL_DATA*>(malloc(required_size)));
152 dev_detail_data->cbSize = sizeof(*dev_detail_data);
153 if (!SetupDiGetDeviceInterfaceDetail(dev_info.get(), &dev_data,
154 dev_detail_data.get(), required_size,
156 PLOG(WARNING) << "SetupDiGetDeviceInterfaceDetail";
160 // Get the handle to access Energy Meter Interface.
161 handle_.Set(::CreateFile(dev_detail_data->DevicePath, GENERIC_READ,
162 FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr,
163 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr));
164 if (!handle_.is_valid()) {
165 LOG(WARNING) << "Failed to set up handle";
169 DWORD bytes_returned = 0;
171 // Verify the EMI interface version.
172 EMI_VERSION emi_version = {0};
173 if (!DeviceIoControl(handle_.get(), IOCTL_EMI_GET_VERSION, nullptr, 0,
174 &emi_version, sizeof(emi_version), &bytes_returned,
176 PLOG(WARNING) << "EMI interface not available";
179 CHECK_EQ(bytes_returned, sizeof(emi_version));
181 if (emi_version.EmiVersion != EMI_VERSION_V2 &&
182 emi_version.EmiVersion != EMI_VERSION_V1) {
183 LOG(WARNING) << "EMI version not supported, EMI version = "
184 << emi_version.EmiVersion;
188 // Get the size of the EMI metadata.
189 EMI_METADATA_SIZE metadata_size = {0};
190 if (!DeviceIoControl(handle_.get(), IOCTL_EMI_GET_METADATA_SIZE, nullptr, 0,
191 &metadata_size, sizeof(metadata_size), &bytes_returned,
193 PLOG(ERROR) << "IOCTL_EMI_GET_METADATA_SIZE";
196 CHECK_EQ(bytes_returned, sizeof(metadata_size));
198 if (!metadata_size.MetadataSize) {
199 LOG(ERROR) << "MetadataSize == 0";
203 // Get the EMI metadata.
204 std::vector<char> metadata_buf(metadata_size.MetadataSize);
205 if (!DeviceIoControl(handle_.get(), IOCTL_EMI_GET_METADATA, nullptr, 0,
206 metadata_buf.data(), metadata_size.MetadataSize,
207 &bytes_returned, nullptr)) {
208 PLOG(ERROR) << "IOCTL_EMI_GET_METADATA";
211 CHECK_EQ(static_cast<DWORD>(bytes_returned), metadata_buf.size());
213 // For different EMI versions, get the types of available metrics
215 if (emi_version.EmiVersion == EMI_VERSION_V1) {
216 EMI_METADATA_V1* metadata_v1 =
217 reinterpret_cast<EMI_METADATA_V1*>(metadata_buf.data());
218 metric_types_.push_back(metadata_v1->MeteredHardwareName);
219 } else if (emi_version.EmiVersion == EMI_VERSION_V2) {
220 EMI_METADATA_V2* metadata_v2 =
221 reinterpret_cast<EMI_METADATA_V2*>(metadata_buf.data());
222 EMI_CHANNEL_V2* channel = &metadata_v2->Channels[0];
223 // EMI v2 has a different channel for each metric.
224 for (int i = 0; i < metadata_v2->ChannelCount; ++i) {
225 metric_types_.push_back(channel->ChannelName);
226 channel = EMI_CHANNEL_V2_NEXT_CHANNEL(channel);
230 if (metric_types_.empty()) {
231 LOG(WARNING) << "No available energy metric";
237 } // namespace power_metrics