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/*
*
* Copyright (C) 2020 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "source/loader/driver_discovery.h"
#include <windows.h>
#include <cassert>
#include <cfgmgr32.h>
#include <devpkey.h>
#include <devguid.h>
#include <iostream>
#include <sstream>
#include <string>
namespace loader {
std::vector<DriverLibraryPath> discoverDriversBasedOnDisplayAdapters(const GUID rguid);
std::vector<DriverLibraryPath> discoverEnabledDrivers() {
std::vector<DriverLibraryPath> enabledDrivers;
DWORD envBufferSize = 65535;
std::string altDrivers;
altDrivers.resize(envBufferSize);
// ZE_ENABLE_ALT_DRIVERS is for development/debug only
envBufferSize = GetEnvironmentVariable("ZE_ENABLE_ALT_DRIVERS", &altDrivers[0], envBufferSize);
if (!envBufferSize) {
// Standard drivers discovered from registry - not custom
auto displayDrivers = discoverDriversBasedOnDisplayAdapters(GUID_DEVCLASS_DISPLAY);
auto computeDrivers = discoverDriversBasedOnDisplayAdapters(GUID_DEVCLASS_COMPUTEACCELERATOR);
enabledDrivers.insert(enabledDrivers.end(), displayDrivers.begin(), displayDrivers.end());
enabledDrivers.insert(enabledDrivers.end(), computeDrivers.begin(), computeDrivers.end());
} else {
// Alternative drivers from environment variable - these are custom
std::stringstream ss(altDrivers.c_str());
while (ss.good()) {
std::string substr;
getline(ss, substr, ',');
enabledDrivers.emplace_back(substr, true, ZEL_DRIVER_TYPE_FORCE_UINT32);
}
}
return enabledDrivers;
}
bool isStagedDriverPathSetForDisplayAdapter(DEVINST dnDevNode) {
static constexpr char stagedDriverPathKey[] = "LevelZeroStagedDriverPath";
HKEY hkey = {};
CONFIGRET configErr = CM_Open_DevNode_Key(dnDevNode, KEY_QUERY_VALUE, 0,
RegDisposition_OpenExisting, &hkey,
CM_REGISTRY_SOFTWARE);
if (CR_SUCCESS != configErr) {
assert(false && "CM_Open_DevNode_Key failed");
return false;
}
DWORD regValueType = {};
DWORD pathSize = {};
LSTATUS regOpStatus = RegQueryValueExA(hkey, stagedDriverPathKey, NULL,
®ValueType, NULL, &pathSize);
bool isStagedDriverPathSet = false;
if (ERROR_SUCCESS == regOpStatus) {
isStagedDriverPathSet = true;
}
regOpStatus = RegCloseKey(hkey);
assert((ERROR_SUCCESS == regOpStatus) && "RegCloseKey failed");
return isStagedDriverPathSet;
}
bool isDeviceAvailable(DEVINST devnode) {
ULONG devStatus = {};
ULONG devProblem = {};
auto configErr = CM_Get_DevNode_Status(&devStatus, &devProblem, devnode, 0);
if (CR_SUCCESS != configErr) {
assert(false && "CM_Get_DevNode_Status failed");
return false;
}
bool isInInvalidState = (devStatus & DN_HAS_PROBLEM)
&& (devProblem == CM_PROB_NEED_RESTART);
if (! isStagedDriverPathSetForDisplayAdapter(devnode)) {
isInInvalidState |= (DN_NEED_RESTART == (devStatus & DN_NEED_RESTART));
}
isInInvalidState |= (devStatus & DN_HAS_PROBLEM)
&& (devProblem == CM_PROB_DISABLED);
return false == isInInvalidState;
}
DriverLibraryPath readDriverPathForDisplayAdapter(DEVINST dnDevNode) {
static constexpr char levelZeroDriverPathKey[] = "LevelZeroDriverPath";
HKEY hkey = {};
CONFIGRET configErr = CM_Open_DevNode_Key(dnDevNode, KEY_QUERY_VALUE, 0,
RegDisposition_OpenExisting, &hkey,
CM_REGISTRY_SOFTWARE);
if (CR_SUCCESS != configErr) {
assert(false && "CM_Open_DevNode_Key failed");
return DriverLibraryPath("", false);
}
DWORD regValueType = {};
DWORD pathSize = {};
LSTATUS regOpStatus = RegQueryValueExA(hkey, levelZeroDriverPathKey, NULL,
®ValueType, NULL, &pathSize);
std::string driverPath;
if ((ERROR_SUCCESS == regOpStatus) && (REG_SZ == regValueType)) {
driverPath.resize(pathSize);
regOpStatus = RegQueryValueExA(hkey, levelZeroDriverPathKey, NULL,
®ValueType, (LPBYTE) & *driverPath.begin(),
&pathSize);
if (ERROR_SUCCESS != regOpStatus) {
assert(false && "RegQueryValueExA failed");
driverPath.clear();
}
}
regOpStatus = RegCloseKey(hkey);
assert((ERROR_SUCCESS == regOpStatus) && "RegCloseKey failed");
return DriverLibraryPath(driverPath, false);
}
std::wstring readDisplayAdaptersDeviceIdsList(const GUID rguid) {
OLECHAR displayGuidStr[MAX_GUID_STRING_LEN];
int strFromGuidErr = StringFromGUID2(rguid, displayGuidStr,
MAX_GUID_STRING_LEN);
if (MAX_GUID_STRING_LEN != strFromGuidErr) {
assert(false && "StringFromGUID2 failed");
return L"";
}
std::wstring deviceIdList;
CONFIGRET getDeviceIdListErr = CR_BUFFER_SMALL;
while (CR_BUFFER_SMALL == getDeviceIdListErr) {
ULONG deviceIdListSize = {};
ULONG deviceIdListFlags = CM_GETIDLIST_FILTER_CLASS | CM_GETIDLIST_FILTER_PRESENT;
auto getDeviceIdListSizeErr = CM_Get_Device_ID_List_SizeW(&deviceIdListSize,
displayGuidStr,
deviceIdListFlags);
if (CR_SUCCESS != getDeviceIdListSizeErr) {
assert(false && "CM_Get_Device_ID_List_size failed");
break;
}
deviceIdList.resize(deviceIdListSize);
getDeviceIdListErr = CM_Get_Device_ID_ListW(displayGuidStr,
&*deviceIdList.begin(),
deviceIdListSize,
deviceIdListFlags);
}
return deviceIdList;
}
std::vector<DriverLibraryPath> discoverDriversBasedOnDisplayAdapters(const GUID rguid) {
std::vector<DriverLibraryPath> enabledDrivers;
auto deviceIdList = readDisplayAdaptersDeviceIdsList(rguid);
if (deviceIdList.empty()) {
return enabledDrivers;
}
auto isNotDeviceListEnd = [](wchar_t *it) { return '\0' != it[0]; };
auto getNextDeviceInList = [](wchar_t *it) { return it + wcslen(it) + 1; };
auto deviceIdIt = &*deviceIdList.begin();
for (; isNotDeviceListEnd(deviceIdIt); deviceIdIt = getNextDeviceInList(deviceIdIt)) {
DEVINST devinst = {};
if (CR_SUCCESS != CM_Locate_DevNodeW(&devinst, deviceIdIt, 0)) {
assert(false && "CM_Locate_DevNodeW failed");
continue;
}
if (false == isDeviceAvailable(devinst)) {
continue;
}
auto driverPath = readDriverPathForDisplayAdapter(devinst);
if (driverPath.path.empty()) {
continue;
}
bool alreadyOnTheList = (enabledDrivers.end() != std::find_if(enabledDrivers.begin(), enabledDrivers.end(),
[&driverPath](const DriverLibraryPath& d) { return d.path == driverPath.path; }));
if (alreadyOnTheList) {
continue;
}
driverPath.customDriver = false;
if (rguid == GUID_DEVCLASS_DISPLAY) {
driverPath.driverType = ZEL_DRIVER_TYPE_GPU;
} else if (rguid == GUID_DEVCLASS_COMPUTEACCELERATOR) {
driverPath.driverType = ZEL_DRIVER_TYPE_NPU;
} else {
driverPath.driverType = ZEL_DRIVER_TYPE_FORCE_UINT32;
}
enabledDrivers.push_back(std::move(driverPath));
}
return enabledDrivers;
}
} // namespace loader
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