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#include "detection/cpuusage/cpuusage.h"
#include "common/mallocHelper.h"
#include "common/debug.h"
#include <ntstatus.h>
#include <windows.h>
#include <wchar.h>
#include "common/windows/perflib_.h"
#include "common/windows/nt.h"
static const char* getInfoByNqsi(FFlist* cpuTimes) {
ULONG size = 0;
if (NtQuerySystemInformation(SystemProcessorPerformanceInformation, NULL, 0, &size) != STATUS_INFO_LENGTH_MISMATCH) {
return "NtQuerySystemInformation(SystemProcessorPerformanceInformation, NULL) failed";
}
SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION* FF_AUTO_FREE pinfo = (SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION*) malloc(size);
if (!NT_SUCCESS(NtQuerySystemInformation(SystemProcessorPerformanceInformation, pinfo, size, &size))) {
return "NtQuerySystemInformation(SystemProcessorPerformanceInformation, size) failed";
}
for (uint32_t i = 0; i < size / sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION); ++i) {
SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION* coreInfo = pinfo + i;
// KernelTime includes IdleTime and DpcTime.
coreInfo->KernelTime.QuadPart -= coreInfo->IdleTime.QuadPart;
uint64_t inUse = (uint64_t) (coreInfo->UserTime.QuadPart + coreInfo->KernelTime.QuadPart);
uint64_t total = inUse + (uint64_t) coreInfo->IdleTime.QuadPart;
FFCpuUsageInfo* info = FF_LIST_ADD(FFCpuUsageInfo, *cpuTimes);
*info = (FFCpuUsageInfo) {
.inUseAll = inUse,
.totalAll = total,
};
}
return NULL;
}
static const char* getInfoByPerflib(FFlist* cpuTimes) {
static HANDLE hQuery = NULL;
if (hQuery == NULL) {
struct FFPerfQuerySpec {
PERF_COUNTER_IDENTIFIER Identifier;
WCHAR Name[16];
} querySpec = {
.Identifier = {
// Processor Information GUID
// HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Perflib\_V2Providers\{383487a6-3676-4870-a4e7-d45b30c35629}\{b4fc721a-0378-476f-89ba-a5a79f810b36}
.CounterSetGuid = { 0xb4fc721a, 0x0378, 0x476f, { 0x89, 0xba, 0xa5, 0xa7, 0x9f, 0x81, 0x0b, 0x36 } },
.Size = sizeof(querySpec),
.CounterId = PERF_WILDCARD_COUNTER, // https://learn.microsoft.com/en-us/windows/win32/perfctrs/using-the-perflib-functions-to-consume-counter-data
.InstanceId = PERF_WILDCARD_COUNTER,
},
.Name = PERF_WILDCARD_INSTANCE,
};
if (PerfOpenQueryHandle(NULL, &hQuery) != ERROR_SUCCESS) {
PerfCloseQueryHandle(hQuery);
hQuery = INVALID_HANDLE_VALUE;
return "PerfOpenQueryHandle() failed";
}
if (PerfAddCounters(hQuery, &querySpec.Identifier, sizeof(querySpec)) != ERROR_SUCCESS) {
PerfCloseQueryHandle(hQuery);
hQuery = INVALID_HANDLE_VALUE;
return "PerfAddCounters() failed";
}
if (querySpec.Identifier.Status != ERROR_SUCCESS) {
PerfCloseQueryHandle(hQuery);
hQuery = INVALID_HANDLE_VALUE;
return "PerfAddCounters() reports invalid identifier";
}
}
if (hQuery == INVALID_HANDLE_VALUE) {
return "Init hQuery failed";
}
DWORD dataSize = 0;
if (PerfQueryCounterData(hQuery, NULL, 0, &dataSize) != ERROR_NOT_ENOUGH_MEMORY) {
return "PerfQueryCounterData(NULL) failed";
}
if (dataSize <= sizeof(PERF_DATA_HEADER) + sizeof(PERF_COUNTER_HEADER)) {
return "instance doesn't exist";
}
FF_AUTO_FREE PERF_DATA_HEADER* const pDataHeader = (PERF_DATA_HEADER*) malloc(dataSize);
if (PerfQueryCounterData(hQuery, pDataHeader, dataSize, &dataSize) != ERROR_SUCCESS) {
return "PerfQueryCounterData(pDataHeader) failed";
}
PERF_COUNTER_HEADER* pCounterHeader = (PERF_COUNTER_HEADER*) (pDataHeader + 1);
if (pCounterHeader->dwType != PERF_COUNTERSET) {
return "Invalid counter type";
}
PERF_MULTI_COUNTERS* pMultiCounters = (PERF_MULTI_COUNTERS*) (pCounterHeader + 1);
if (pMultiCounters->dwCounters == 0) {
return "No CPU counters found";
}
PERF_MULTI_INSTANCES* pMultiInstances = (PERF_MULTI_INSTANCES*) ((BYTE*) pMultiCounters + pMultiCounters->dwSize);
if (pMultiInstances->dwInstances == 0) {
return "No CPU instances found";
}
PERF_INSTANCE_HEADER* pInstanceHeader = (PERF_INSTANCE_HEADER*) (pMultiInstances + 1);
for (DWORD iInstance = 0; iInstance < pMultiInstances->dwInstances; ++iInstance) {
const wchar_t* instanceName = (const wchar_t*) ((BYTE*) pInstanceHeader + sizeof(*pInstanceHeader));
PERF_COUNTER_DATA* pCounterData = (PERF_COUNTER_DATA*) ((BYTE*) pInstanceHeader + pInstanceHeader->Size);
uint64_t processorUtility = UINT64_MAX, utilityBase = UINT64_MAX;
for (ULONG iCounter = 0; iCounter != pMultiCounters->dwCounters; iCounter++) {
DWORD* pCounterIds = (DWORD*) (pMultiCounters + 1);
// https://learn.microsoft.com/en-us/windows/win32/perfctrs/using-the-perflib-functions-to-consume-counter-data
switch (pCounterIds[iCounter]) {
case 26: // % Processor Utility (#26, Type=PERF_AVERAGE_BULK)
assert(pCounterData->dwDataSize == sizeof(uint64_t));
processorUtility = *(uint64_t*) (pCounterData + 1);
break;
case 27: // % Utility Base (#27, Type=PERF_AVERAGE_BASE)
assert(pCounterData->dwDataSize == sizeof(uint32_t));
utilityBase = *(uint32_t*) (pCounterData + 1) * 100LLU;
break;
}
pCounterData = (PERF_COUNTER_DATA*) ((BYTE*) pCounterData + pCounterData->dwSize);
}
if (wcschr(instanceName, L'_') == NULL /* ignore `_Total` */) {
if (processorUtility == UINT64_MAX) {
return "Counter \"% Processor Utility\" are not supported";
}
FFCpuUsageInfo* info = FF_LIST_ADD(FFCpuUsageInfo, *cpuTimes);
*info = (FFCpuUsageInfo) {
.inUseAll = processorUtility,
.totalAll = utilityBase,
};
}
pInstanceHeader = (PERF_INSTANCE_HEADER*) pCounterData;
}
return NULL;
}
const char* ffGetCpuUsageInfo(FFlist* cpuTimes) {
const char* error = NULL;
if (ffIsWindows10OrGreater()) {
error = getInfoByPerflib(cpuTimes);
FF_DEBUG("Get CPU usage info by Perflib: %s", error ?: "success");
if (!error) {
return NULL;
}
ffListClear(cpuTimes);
}
error = getInfoByNqsi(cpuTimes);
FF_DEBUG("Get CPU usage info by NtQuerySystemInformation: %s", error ?: "success");
return error;
}
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