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/*
* Copyright (C) 2025 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "level_zero/sysman/source/driver/linux/sysman_os_driver_imp.h"
#include "shared/source/debug_settings/debug_settings_manager.h"
#include "shared/source/os_interface/linux/hw_device_id.h"
#include "shared/source/os_interface/linux/sys_calls.h"
#include "shared/source/os_interface/os_interface.h"
#include "shared/source/utilities/directory.h"
#include "level_zero/sysman/source/device/sysman_hw_device_id.h"
#include "level_zero/sysman/source/device/sysman_os_device.h"
#include "level_zero/sysman/source/driver/os_sysman_driver.h"
namespace L0 {
namespace Sysman {
std::vector<std::string> getFiles(const std::string &path) {
std::vector<std::string> files;
DIR *dir = NEO::SysCalls::opendir(path.c_str());
if (dir == nullptr) {
return files;
}
struct dirent *entry = nullptr;
while ((entry = NEO::SysCalls::readdir(dir)) != nullptr) {
if (entry->d_name[0] == '.') {
continue;
}
std::string fullPath;
fullPath += path;
fullPath += "/";
fullPath += entry->d_name;
files.push_back(fullPath);
}
NEO::SysCalls::closedir(dir);
return files;
}
std::vector<std::unique_ptr<NEO::HwDeviceId>> LinuxDriverImp::discoverDevicesWithSurvivabilityMode() {
std::vector<std::unique_ptr<NEO::HwDeviceId>> hwSurvivabilityDeviceIds;
const char *pciXeKmdDevicesDirectory = "/sys/bus/pci/drivers/xe";
const char *survivabilitySysFsNodeName = "/survivability_mode";
std::vector<std::string> files = getFiles(pciXeKmdDevicesDirectory);
for (std::vector<std::string>::iterator file = files.begin(); file != files.end(); ++file) {
std::string devicePathView(file->c_str(), file->size());
std::size_t loc = devicePathView.find_last_of("/");
std::string bdfString = devicePathView.substr(loc + 1); // omits / character too
constexpr int bdfTokensNum = 4;
uint16_t domain = -1;
uint8_t bus = -1, device = -1, function = -1;
if (NEO::parseBdfString(bdfString, domain, bus, device, function) != bdfTokensNum) {
continue;
}
std::string path = std::string(file->c_str()) + std::string(survivabilitySysFsNodeName);
int fileDescriptor = NEO::SysCalls::open(path.c_str(), O_RDONLY);
if (fileDescriptor < 0) {
continue;
}
hwSurvivabilityDeviceIds.push_back(std::make_unique<NEO::HwDeviceIdDrm>(fileDescriptor, bdfString.c_str(), file->c_str()));
}
return hwSurvivabilityDeviceIds;
}
ze_result_t LinuxDriverImp::initializeInSurvivabilityMode(std::vector<std::unique_ptr<NEO::HwDeviceId>> &&hwDeviceIds, SysmanDriverHandleImp *pSysmanDriverHandleImp) {
for (auto &hwDeviceId : hwDeviceIds) {
auto sysmanHwDeviceId = createSysmanHwDeviceId(hwDeviceId);
auto pSysmanDevice = OsSysmanSurvivabilityDevice::createSurvivabilityDevice(std::move(sysmanHwDeviceId));
if (pSysmanDevice != nullptr) {
pSysmanDriverHandleImp->sysmanDevices.push_back(pSysmanDevice);
}
}
if (pSysmanDriverHandleImp->sysmanDevices.size() == 0) {
return ZE_RESULT_ERROR_UNINITIALIZED;
}
if (pSysmanDriverHandleImp->pOsSysmanDriver == nullptr) {
pSysmanDriverHandleImp->pOsSysmanDriver = L0::Sysman::OsSysmanDriver::create();
}
pSysmanDriverHandleImp->numDevices = static_cast<uint32_t>(pSysmanDriverHandleImp->sysmanDevices.size());
return ZE_RESULT_SUCCESS;
}
SysmanDriverHandle *LinuxDriverImp::createInSurvivabilityMode(std::vector<std::unique_ptr<NEO::HwDeviceId>> &&hwDeviceId, ze_result_t *returnValue) {
SysmanDriverHandleImp *driverHandle = new SysmanDriverHandleImp;
UNRECOVERABLE_IF(nullptr == driverHandle);
ze_result_t res = initializeInSurvivabilityMode(std::move(hwDeviceId), driverHandle);
if (res != ZE_RESULT_SUCCESS) {
delete driverHandle;
driverHandle = nullptr;
*returnValue = res;
return nullptr;
}
globalSysmanDriver = driverHandle;
*returnValue = res;
return driverHandle;
}
void LinuxDriverImp::initSurvivabilityDevices(_ze_driver_handle_t *sysmanDriverHandle, ze_result_t *result) {
std::vector<std::unique_ptr<NEO::HwDeviceId>> hwSurvivabilityDeviceIds = discoverDevicesWithSurvivabilityMode();
if (!hwSurvivabilityDeviceIds.empty()) {
SysmanDriverHandleImp *pSysmanDriverHandleImp = static_cast<SysmanDriverHandleImp *>(sysmanDriverHandle);
*result = initializeInSurvivabilityMode(std::move(hwSurvivabilityDeviceIds), pSysmanDriverHandleImp);
}
}
SysmanDriverHandle *LinuxDriverImp::initSurvivabilityDevicesWithDriver(ze_result_t *result, uint32_t *driverCount) {
std::vector<std::unique_ptr<NEO::HwDeviceId>> hwSurvivabilityDeviceIds = discoverDevicesWithSurvivabilityMode();
SysmanDriverHandle *pSysmanDriverHandle = nullptr;
if (!hwSurvivabilityDeviceIds.empty()) {
pSysmanDriverHandle = createInSurvivabilityMode(std::move(hwSurvivabilityDeviceIds), result);
*driverCount = 1;
} else {
NEO::printDebugString(NEO::debugManager.flags.PrintDebugMessages.get(), stderr,
"%s\n", "No devices found");
*result = ZE_RESULT_ERROR_UNINITIALIZED;
}
return pSysmanDriverHandle;
}
std::unique_ptr<OsDriver> OsDriver::create() {
std::unique_ptr<LinuxDriverImp> pLinuxDriverImp = std::make_unique<LinuxDriverImp>();
return pLinuxDriverImp;
}
} // namespace Sysman
} // namespace L0
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