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compute-runtime/level_zero/sysman/source/linux/zes_os_sysman_imp.cpp

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/*
* Copyright (C) 2023 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "level_zero/sysman/source/linux/zes_os_sysman_imp.h"
#include "shared/source/debug_settings/debug_settings_manager.h"
#include "shared/source/helpers/gfx_core_helper.h"
#include "shared/source/helpers/sleep.h"
#include "shared/source/os_interface/driver_info.h"
#include "shared/source/os_interface/linux/drm_neo.h"
#include "shared/source/os_interface/linux/pci_path.h"
#include "shared/source/os_interface/linux/system_info.h"
#include "shared/source/os_interface/os_interface.h"
#include "level_zero/sysman/source/firmware_util/sysman_firmware_util.h"
#include "level_zero/sysman/source/linux/pmt/sysman_pmt.h"
#include "level_zero/sysman/source/linux/pmu/sysman_pmu.h"
#include "level_zero/sysman/source/linux/sysman_fs_access.h"
#include "level_zero/sysman/source/pci/linux/sysman_os_pci_imp.h"
#include "level_zero/sysman/source/pci/sysman_pci_utils.h"
#include "level_zero/sysman/source/shared/linux/sysman_kmd_interface.h"
namespace L0 {
namespace Sysman {
const std::string LinuxSysmanImp::deviceDir("device");
ze_result_t LinuxSysmanImp::init() {
pFsAccess = FsAccess::create();
DEBUG_BREAK_IF(nullptr == pFsAccess);
if (pProcfsAccess == nullptr) {
pProcfsAccess = ProcfsAccess::create();
}
DEBUG_BREAK_IF(nullptr == pProcfsAccess);
ze_result_t result;
NEO::OSInterface &osInterface = *pParentSysmanDeviceImp->getRootDeviceEnvironment().osInterface;
if (osInterface.getDriverModel()->getDriverModelType() != NEO::DriverModelType::DRM) {
return ZE_RESULT_ERROR_UNSUPPORTED_FEATURE;
}
auto sysmanHwDeviceId = getSysmanHwDeviceId();
sysmanHwDeviceId->openFileDescriptor();
int myDeviceFd = sysmanHwDeviceId->getFileDescriptor();
std::string myDeviceName;
result = pProcfsAccess->getFileName(pProcfsAccess->myProcessId(), myDeviceFd, myDeviceName);
if (ZE_RESULT_SUCCESS != result) {
return result;
}
if (pSysfsAccess == nullptr) {
pSysfsAccess = SysfsAccess::create(myDeviceName);
}
DEBUG_BREAK_IF(nullptr == pSysfsAccess);
subDeviceCount = NEO::GfxCoreHelper::getSubDevicesCount(&pParentSysmanDeviceImp->getHardwareInfo());
if (subDeviceCount == 1) {
subDeviceCount = 0;
}
rootPath = NEO::getPciRootPath(myDeviceFd).value_or("");
pSysfsAccess->getRealPath(deviceDir, gtDevicePath);
pSysmanKmdInterface = SysmanKmdInterface::create(*getDrm());
osInterface.getDriverModel()->as<NEO::Drm>()->cleanup();
// Close Drm handles
sysmanHwDeviceId->closeFileDescriptor();
pPmuInterface = PmuInterface::create(this);
return createPmtHandles();
}
std::string &LinuxSysmanImp::getPciRootPath() {
return rootPath;
}
SysmanHwDeviceIdDrm *LinuxSysmanImp::getSysmanHwDeviceId() {
return static_cast<SysmanHwDeviceIdDrm *>(getDrm()->getHwDeviceId().get());
}
NEO::Drm *LinuxSysmanImp::getDrm() {
const auto &osInterface = *pParentSysmanDeviceImp->getRootDeviceEnvironment().osInterface;
return osInterface.getDriverModel()->as<NEO::Drm>();
}
ze_result_t LinuxSysmanImp::createPmtHandles() {
std::string gtDevicePCIPath;
auto result = pSysfsAccess->getRealPath("device", gtDevicePCIPath);
if (ZE_RESULT_SUCCESS != result) {
return result;
}
auto gpuUpstreamPortPath = getPciCardBusDirectoryPath(gtDevicePCIPath);
PlatformMonitoringTech::create(this, gpuUpstreamPortPath, mapOfSubDeviceIdToPmtObject);
return result;
}
static std::string modifyPathOnLevel(std::string realPciPath, uint8_t nLevel) {
size_t loc;
// we need to change the absolute path to 'nLevel' levels up
while (nLevel > 0) {
loc = realPciPath.find_last_of('/');
if (loc == std::string::npos) {
break;
}
realPciPath = realPciPath.substr(0, loc);
nLevel--;
}
return realPciPath;
}
std::string LinuxSysmanImp::getPciRootPortDirectoryPath(std::string realPciPath) {
// the rootport is always the first pci folder after the pcie slot.
// +-[0000:89]-+-00.0
// | +-00.1
// | +-00.2
// | +-00.4
// | \-02.0-[8a-8e]----00.0-[8b-8e]--+-01.0-[8c-8d]----00.0
// | \-02.0-[8e]--+-00.0
// | +-00.1
// | \-00.2
// /sys/devices/pci0000:89/0000:89:02.0/0000:8a:00.0/0000:8b:01.0/0000:8c:00.0
// '/sys/devices/pci0000:89/0000:89:02.0/' will always be the same distance.
// from 0000:8c:00.0 i.e the 3rd PCI address from the gt tile
return modifyPathOnLevel(realPciPath, 3);
}
std::string LinuxSysmanImp::getPciCardBusDirectoryPath(std::string realPciPath) {
// the cardbus is always the second pci folder after the pcie slot.
// +-[0000:89]-+-00.0
// | +-00.1
// | +-00.2
// | +-00.4
// | \-02.0-[8a-8e]----00.0-[8b-8e]--+-01.0-[8c-8d]----00.0
// | \-02.0-[8e]--+-00.0
// | +-00.1
// | \-00.2
// /sys/devices/pci0000:89/0000:89:02.0/0000:8a:00.0/0000:8b:01.0/0000:8c:00.0
// '/sys/devices/pci0000:89/0000:89:02.0/0000:8a:00.0/' will always be the same distance.
// from 0000:8c:00.0 i.e the 2nd PCI address from the gt tile.
return modifyPathOnLevel(realPciPath, 2);
}
PlatformMonitoringTech *LinuxSysmanImp::getPlatformMonitoringTechAccess(uint32_t subDeviceId) {
auto subDeviceIdToPmtEntry = mapOfSubDeviceIdToPmtObject.find(subDeviceId);
if (subDeviceIdToPmtEntry == mapOfSubDeviceIdToPmtObject.end()) {
return nullptr;
}
return subDeviceIdToPmtEntry->second;
}
void LinuxSysmanImp::releasePmtObject() {
for (auto &subDeviceIdToPmtEntry : mapOfSubDeviceIdToPmtObject) {
if (subDeviceIdToPmtEntry.second) {
delete subDeviceIdToPmtEntry.second;
subDeviceIdToPmtEntry.second = nullptr;
}
}
mapOfSubDeviceIdToPmtObject.clear();
}
FsAccess &LinuxSysmanImp::getFsAccess() {
UNRECOVERABLE_IF(nullptr == pFsAccess);
return *pFsAccess;
}
ProcfsAccess &LinuxSysmanImp::getProcfsAccess() {
UNRECOVERABLE_IF(nullptr == pProcfsAccess);
return *pProcfsAccess;
}
SysfsAccess &LinuxSysmanImp::getSysfsAccess() {
UNRECOVERABLE_IF(nullptr == pSysfsAccess);
return *pSysfsAccess;
}
SysmanDeviceImp *LinuxSysmanImp::getSysmanDeviceImp() {
return pParentSysmanDeviceImp;
}
uint32_t LinuxSysmanImp::getSubDeviceCount() {
return subDeviceCount;
}
LinuxSysmanImp::LinuxSysmanImp(SysmanDeviceImp *pParentSysmanDeviceImp) {
this->pParentSysmanDeviceImp = pParentSysmanDeviceImp;
executionEnvironment = pParentSysmanDeviceImp->getExecutionEnvironment();
rootDeviceIndex = pParentSysmanDeviceImp->getRootDeviceIndex();
}
void LinuxSysmanImp::createFwUtilInterface() {
const auto pciBusInfo = pParentSysmanDeviceImp->getRootDeviceEnvironment().osInterface->getDriverModel()->getPciBusInfo();
const uint16_t domain = static_cast<uint16_t>(pciBusInfo.pciDomain);
const uint8_t bus = static_cast<uint8_t>(pciBusInfo.pciBus);
const uint8_t device = static_cast<uint8_t>(pciBusInfo.pciDevice);
const uint8_t function = static_cast<uint8_t>(pciBusInfo.pciFunction);
pFwUtilInterface = FirmwareUtil::create(domain, bus, device, function);
}
FirmwareUtil *LinuxSysmanImp::getFwUtilInterface() {
const std::lock_guard<std::mutex> lock(this->fwLock);
if (pFwUtilInterface == nullptr) {
createFwUtilInterface();
}
return pFwUtilInterface;
}
void LinuxSysmanImp::releaseFwUtilInterface() {
if (nullptr != pFwUtilInterface) {
delete pFwUtilInterface;
pFwUtilInterface = nullptr;
}
}
LinuxSysmanImp::~LinuxSysmanImp() {
if (nullptr != pSysfsAccess) {
delete pSysfsAccess;
pSysfsAccess = nullptr;
}
if (nullptr != pProcfsAccess) {
delete pProcfsAccess;
pProcfsAccess = nullptr;
}
if (nullptr != pFsAccess) {
delete pFsAccess;
pFsAccess = nullptr;
}
if (nullptr != pPmuInterface) {
delete pPmuInterface;
pPmuInterface = nullptr;
}
releaseFwUtilInterface();
releasePmtObject();
}
void LinuxSysmanImp::getPidFdsForOpenDevice(ProcfsAccess *pProcfsAccess, SysfsAccess *pSysfsAccess, const ::pid_t pid, std::vector<int> &deviceFds) {
// Return a list of all the file descriptors of this process that point to this device
std::vector<int> fds;
deviceFds.clear();
if (ZE_RESULT_SUCCESS != pProcfsAccess->getFileDescriptors(pid, fds)) {
// Process exited. Not an error. Just ignore.
return;
}
for (auto &&fd : fds) {
std::string file;
if (pProcfsAccess->getFileName(pid, fd, file) != ZE_RESULT_SUCCESS) {
// Process closed this file. Not an error. Just ignore.
continue;
}
if (pSysfsAccess->isMyDeviceFile(file)) {
deviceFds.push_back(fd);
}
}
}
ze_result_t LinuxSysmanImp::gpuProcessCleanup() {
::pid_t myPid = pProcfsAccess->myProcessId();
std::vector<::pid_t> processes;
std::vector<int> myPidFds;
ze_result_t result = pProcfsAccess->listProcesses(processes);
if (ZE_RESULT_SUCCESS != result) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stderr,
"gpuProcessCleanup: listProcesses() failed with error code: %ld\n", result);
return result;
}
for (auto &&pid : processes) {
std::vector<int> fds;
getPidFdsForOpenDevice(pProcfsAccess, pSysfsAccess, pid, fds);
if (pid == myPid) {
// L0 is expected to have this file open.
// Keep list of fds. Close before unbind.
myPidFds = fds;
continue;
}
if (!fds.empty()) {
pProcfsAccess->kill(pid);
}
}
for (auto &&fd : myPidFds) {
// Close open filedescriptors to the device
// before unbinding device.
// From this point forward, there is no
// graceful way to fail the reset call.
// All future ze calls by this process for this
// device will fail.
NEO::SysCalls::close(fd);
}
return ZE_RESULT_SUCCESS;
}
void LinuxSysmanImp::releaseSysmanDeviceResources() {
getSysmanDeviceImp()->pEngineHandleContext->releaseEngines();
getSysmanDeviceImp()->pRasHandleContext->releaseRasHandles();
if (!diagnosticsReset) {
getSysmanDeviceImp()->pDiagnosticsHandleContext->releaseDiagnosticsHandles();
}
getSysmanDeviceImp()->pFirmwareHandleContext->releaseFwHandles();
releasePmtObject();
if (!diagnosticsReset) {
releaseFwUtilInterface();
}
}
ze_result_t LinuxSysmanImp::reInitSysmanDeviceResources() {
createPmtHandles();
if (!diagnosticsReset) {
if (pFwUtilInterface == nullptr) {
createFwUtilInterface();
}
}
if (getSysmanDeviceImp()->pRasHandleContext->isRasInitDone()) {
getSysmanDeviceImp()->pRasHandleContext->init(getSubDeviceCount());
}
if (getSysmanDeviceImp()->pEngineHandleContext->isEngineInitDone()) {
getSysmanDeviceImp()->pEngineHandleContext->init(getSubDeviceCount());
}
if (!diagnosticsReset) {
if (getSysmanDeviceImp()->pDiagnosticsHandleContext->isDiagnosticsInitDone()) {
getSysmanDeviceImp()->pDiagnosticsHandleContext->init();
}
}
diagnosticsReset = false;
isMemoryDiagnostics = false;
if (getSysmanDeviceImp()->pFirmwareHandleContext->isFirmwareInitDone()) {
getSysmanDeviceImp()->pFirmwareHandleContext->init();
}
return ZE_RESULT_SUCCESS;
}
// function to clear Hot-Plug interrupt enable bit in the slot control register
// this is required to prevent interrupts from being raised in the warm reset path.
void LinuxSysmanImp::clearHPIE(int fd) {
uint8_t value = 0x00;
uint8_t resetValue = 0x00;
uint8_t offset = 0x0;
this->preadFunction(fd, &offset, 0x01, PCI_CAPABILITY_LIST);
// Bottom two bits of capability pointer register are reserved and
// software should mask these bits to get pointer to capability list.
// PCI_EXP_SLTCTL - offset for slot control register.
offset = (offset & 0xfc) + PCI_EXP_SLTCTL;
this->preadFunction(fd, &value, 0x01, offset);
resetValue = value & (~PCI_EXP_SLTCTL_HPIE);
this->pwriteFunction(fd, &resetValue, 0x01, offset);
NEO::sleep(std::chrono::seconds(10)); // Sleep for 10seconds just to make sure the change is propagated.
}
// Function to adjust VF BAR size i.e Modify VF BAR Control register.
// size param is an encoded value described as follows:
// 0 - 1 MB (2^20 bytes)
// 1 - 2 MB (2^21 bytes)
// 2 - 4 MB (2^22 bytes)
// 3 - 8 MB (2^23 bytes)
// .
// .
// .
// b - 2 GB (2^31 bytes)
// 43 - 8 EB (2^63 bytes)
ze_result_t LinuxSysmanImp::resizeVfBar(uint8_t size) {
std::string pciConfigNode;
pciConfigNode = gtDevicePath + "/config";
int fdConfig = -1;
fdConfig = this->openFunction(pciConfigNode.c_str(), O_RDWR);
if (fdConfig < 0) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"Config node open failed\n");
return ZE_RESULT_ERROR_UNKNOWN;
}
std::unique_ptr<uint8_t[]> configMemory = std::make_unique<uint8_t[]>(PCI_CFG_SPACE_EXP_SIZE);
memset(configMemory.get(), 0, PCI_CFG_SPACE_EXP_SIZE);
if (this->preadFunction(fdConfig, configMemory.get(), PCI_CFG_SPACE_EXP_SIZE, 0) < 0) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"Read to get config space failed\n");
return ZE_RESULT_ERROR_UNKNOWN;
}
auto reBarCapPos = L0::Sysman::LinuxPciImp::getRebarCapabilityPos(configMemory.get(), true);
if (!reBarCapPos) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"VF BAR capability not found\n");
return ZE_RESULT_ERROR_UNKNOWN;
}
auto barSizePos = reBarCapPos + PCI_REBAR_CTRL + 1; // position of VF(0) BAR SIZE.
if (this->pwriteFunction(fdConfig, &size, 0x01, barSizePos) < 0) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"Write to change VF bar size failed\n");
return ZE_RESULT_ERROR_UNKNOWN;
}
if (this->closeFunction(fdConfig) < 0) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"Config node close failed\n");
return ZE_RESULT_ERROR_UNKNOWN;
}
return ZE_RESULT_SUCCESS;
}
// A 'warm reset' is a conventional reset that is triggered across a PCI express link.
// A warm reset is triggered either when a link is forced into electrical idle or
// by sending TS1 and TS2 ordered sets with the hot reset bit set.
// Software can initiate a warm reset by setting and then clearing the secondary bus reset bit
// in the bridge control register in the PCI configuration space of the bridge port upstream of the device.
ze_result_t LinuxSysmanImp::osWarmReset() {
std::string rootPortPath;
rootPortPath = getPciRootPortDirectoryPath(gtDevicePath);
int fd = 0;
std::string configFilePath = rootPortPath + '/' + "config";
fd = this->openFunction(configFilePath.c_str(), O_RDWR);
if (fd < 0) {
return ZE_RESULT_ERROR_UNKNOWN;
}
std::string cardBusPath = getPciCardBusDirectoryPath(gtDevicePath);
ze_result_t result = pFsAccess->write(cardBusPath + '/' + "remove", "1");
if (ZE_RESULT_SUCCESS != result) {
return result;
}
NEO::sleep(std::chrono::seconds(10)); // Sleep for 10seconds to make sure that the config spaces of all devices are saved correctly.
clearHPIE(fd);
uint8_t offset = PCI_BRIDGE_CONTROL; // Bridge control offset in Header of PCI config space
uint8_t value = 0x00;
uint8_t resetValue = 0x00;
this->preadFunction(fd, &value, 0x01, offset);
resetValue = value | PCI_BRIDGE_CTL_BUS_RESET;
this->pwriteFunction(fd, &resetValue, 0x01, offset);
NEO::sleep(std::chrono::seconds(10)); // Sleep for 10seconds just to make sure the change is propagated.
this->pwriteFunction(fd, &value, 0x01, offset);
if (isMemoryDiagnostics) {
int32_t delayDurationForPPR = 6; // Sleep for 6 minutes to allow PPR to complete.
if (NEO::DebugManager.flags.DebugSetMemoryDiagnosticsDelay.get() != -1) {
delayDurationForPPR = NEO::DebugManager.flags.DebugSetMemoryDiagnosticsDelay.get();
}
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"Delay of %d mins introduced to allow HBM IFR to complete\n", delayDurationForPPR);
NEO::sleep(std::chrono::seconds(delayDurationForPPR * 60));
} else {
NEO::sleep(std::chrono::seconds(10)); // Sleep for 10 seconds to make sure writing to bridge control offset is propagated.
}
result = pFsAccess->write(rootPortPath + '/' + "rescan", "1");
if (ZE_RESULT_SUCCESS != result) {
return result;
}
NEO::sleep(std::chrono::seconds(10)); // Sleep for 10seconds, allows the rescan to complete on all devices attached to the root port.
int ret = this->closeFunction(fd);
if (ret < 0) {
return ZE_RESULT_ERROR_UNKNOWN;
}
// PCIe port driver uses the BIOS allocated VF bars on bootup. A known bug exists in pcie port driver
// and is causing VF bar allocation failure in PCIe port driver after an SBR - https://bugzilla.kernel.org/show_bug.cgi?id=216795
// WA to adjust VF bar size to 2GB. The default VF bar size is 8GB and for 63VFs, 504GB need to be allocated which is failing on SBR.
// When configured VF bar size to 2GB, an allocation of 126GB is successful. This WA resizes VF0 bar to 2GB. Once pcie port driver
// issue is resolved, this WA may not be necessary. Description for 0xb is explained at function definition - resizeVfVar.
if (NEO::DebugManager.flags.VfBarResourceAllocationWa.get()) {
if (ZE_RESULT_SUCCESS != (result = resizeVfBar(0xb))) {
return result;
}
result = pFsAccess->write(cardBusPath + '/' + "remove", "1");
if (ZE_RESULT_SUCCESS != result) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"Card Bus remove after resizing VF bar failed\n");
return result;
}
result = pFsAccess->write(rootPortPath + '/' + "rescan", "1");
if (ZE_RESULT_SUCCESS != result) {
NEO::printDebugString(NEO::DebugManager.flags.PrintDebugMessages.get(), stdout,
"Rescanning root port failed after resizing VF bar failed\n");
return result;
}
}
return result;
}
std::string LinuxSysmanImp::getAddressFromPath(std::string &rootPortPath) {
size_t loc;
loc = rootPortPath.find_last_of('/'); // we get the pci address of the root port from rootPortPath
return rootPortPath.substr(loc + 1, std::string::npos);
}
ze_result_t LinuxSysmanImp::osColdReset() {
const std::string slotPath("/sys/bus/pci/slots/"); // holds the directories matching to the number of slots in the PC
std::string cardBusPath; // will hold the PCIe Root port directory path (the address of the PCIe slot).
// will hold the absolute real path (not symlink) to the selected Device
cardBusPath = getPciCardBusDirectoryPath(gtDevicePath); // e.g cardBusPath=/sys/devices/pci0000:89/0000:89:02.0/
std::string rootAddress = getAddressFromPath(cardBusPath); // e.g rootAddress = 0000:8a:00.0
std::vector<std::string> dir;
ze_result_t result = pFsAccess->listDirectory(slotPath, dir); // get list of slot directories from /sys/bus/pci/slots/
if (ZE_RESULT_SUCCESS != result) {
return result;
}
for (auto &slot : dir) {
std::string slotAddress;
result = pFsAccess->read((slotPath + slot + "/address"), slotAddress); // extract slot address from the slot directory /sys/bus/pci/slots/<slot num>/address
if (ZE_RESULT_SUCCESS != result) {
return result;
}
if (slotAddress.compare(rootAddress) == 0) { // compare slot address to root port address
result = pFsAccess->write((slotPath + slot + "/power"), "0"); // turn off power
if (ZE_RESULT_SUCCESS != result) {
return result;
}
NEO::sleep(std::chrono::milliseconds(100)); // Sleep for 100 milliseconds just to make sure, 1 ms is defined as part of spec
result = pFsAccess->write((slotPath + slot + "/power"), "1"); // turn on power
if (ZE_RESULT_SUCCESS != result) {
return result;
}
return ZE_RESULT_SUCCESS;
}
}
return ZE_RESULT_ERROR_DEVICE_LOST; // incase the reset fails inform upper layers.
}
uint32_t LinuxSysmanImp::getMemoryType() {
if (memType == unknownMemoryType) {
NEO::Drm *pDrm = getDrm();
auto hwDeviceId = getSysmanHwDeviceId();
hwDeviceId->openFileDescriptor();
if (pDrm->querySystemInfo()) {
auto memSystemInfo = getDrm()->getSystemInfo();
if (memSystemInfo != nullptr) {
memType = memSystemInfo->getMemoryType();
}
}
hwDeviceId->closeFileDescriptor();
}
return memType;
}
OsSysman *OsSysman::create(SysmanDeviceImp *pParentSysmanDeviceImp) {
LinuxSysmanImp *pLinuxSysmanImp = new LinuxSysmanImp(pParentSysmanDeviceImp);
return static_cast<OsSysman *>(pLinuxSysmanImp);
}
} // namespace Sysman
} // namespace L0
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