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/*
* Copyright (C) 2020-2021 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "level_zero/tools/source/sysman/events/linux/os_events_imp.h"
#include "sysman/events/events_imp.h"
#include "sysman/linux/os_sysman_imp.h"
namespace L0 {
const std::string LinuxEventsImp::varFs("/var/lib/libze_intel_gpu/");
const std::string LinuxEventsImp::detachEvent("remove");
const std::string LinuxEventsImp::attachEvent("add");
bool LinuxEventsImp::isResetRequired(zes_event_type_flags_t &pEvent) {
zes_device_state_t pState = {};
pLinuxSysmanImp->getSysmanDeviceImp()->deviceGetState(&pState);
if (pState.reset) {
pEvent |= ZES_EVENT_TYPE_FLAG_DEVICE_RESET_REQUIRED;
return true;
}
return false;
}
bool LinuxEventsImp::checkDeviceDetachEvent(zes_event_type_flags_t &pEvent) {
// When device detach uevent is generated, then L0 udev rules will create a file:
// /var/lib/libze_intel_gpu/remove-<ID_PATH_TAG>
// For <ID_PATH_TAG>, check comment in LinuxEventsImp::init()
const std::string deviceDetachFile = detachEvent + "-" + pciIdPathTag;
const std::string deviceDetachFileAbsolutePath = varFs + deviceDetachFile;
uint32_t val = 0;
auto result = pFsAccess->read(deviceDetachFileAbsolutePath, val);
if (result != ZE_RESULT_SUCCESS) {
return false;
}
if (val == 1) {
pEvent |= ZES_EVENT_TYPE_FLAG_DEVICE_DETACH;
return true;
}
return false;
}
bool LinuxEventsImp::checkDeviceAttachEvent(zes_event_type_flags_t &pEvent) {
// When device detach uevent is generated, then L0 udev rules will create a file:
// /var/lib/libze_intel_gpu/add-<ID_PATH_TAG>
// For <ID_PATH_TAG>, check comment in LinuxEventsImp::init()
const std::string deviceAttachFile = attachEvent + "-" + pciIdPathTag;
const std::string deviceAttachFileAbsolutePath = varFs + deviceAttachFile;
uint32_t val = 0;
auto result = pFsAccess->read(deviceAttachFileAbsolutePath, val);
if (result != ZE_RESULT_SUCCESS) {
return false;
}
if (val == 1) {
pEvent |= ZES_EVENT_TYPE_FLAG_DEVICE_ATTACH;
return true;
}
return false;
}
bool LinuxEventsImp::checkIfMemHealthChanged(zes_event_type_flags_t &pEvent) {
if (currentMemHealth() != memHealthAtEventRegister) {
pEvent |= ZES_EVENT_TYPE_FLAG_MEM_HEALTH;
return true;
}
return false;
}
bool LinuxEventsImp::eventListen(zes_event_type_flags_t &pEvent, uint64_t timeout) {
if (registeredEvents & ZES_EVENT_TYPE_FLAG_DEVICE_RESET_REQUIRED) {
if (isResetRequired(pEvent)) {
registeredEvents &= ~(ZES_EVENT_TYPE_FLAG_DEVICE_RESET_REQUIRED); //After receiving event unregister it
return true;
}
}
if (registeredEvents & ZES_EVENT_TYPE_FLAG_DEVICE_DETACH) {
if (checkDeviceDetachEvent(pEvent)) {
registeredEvents &= ~(ZES_EVENT_TYPE_FLAG_DEVICE_DETACH);
return true;
}
}
if (registeredEvents & ZES_EVENT_TYPE_FLAG_DEVICE_ATTACH) {
if (checkDeviceAttachEvent(pEvent)) {
registeredEvents &= ~(ZES_EVENT_TYPE_FLAG_DEVICE_ATTACH);
return true;
}
}
if (registeredEvents & ZES_EVENT_TYPE_FLAG_MEM_HEALTH) {
if (checkIfMemHealthChanged(pEvent)) {
registeredEvents &= ~(ZES_EVENT_TYPE_FLAG_MEM_HEALTH);
return true;
}
}
return false;
}
ze_result_t LinuxEventsImp::eventRegister(zes_event_type_flags_t events) {
if (0x7fff < events) {
return ZE_RESULT_ERROR_INVALID_ENUMERATION;
}
registeredEvents |= events;
if (registeredEvents & ZES_EVENT_TYPE_FLAG_MEM_HEALTH) {
memHealthAtEventRegister = currentMemHealth();
}
return ZE_RESULT_SUCCESS;
}
zes_mem_health_t LinuxEventsImp::currentMemHealth() {
return ZES_MEM_HEALTH_UNKNOWN;
}
void LinuxEventsImp::getPciIdPathTag() {
std::string bdfDir;
ze_result_t result = pSysfsAccess->readSymLink("device", bdfDir);
if (ZE_RESULT_SUCCESS != result) {
return;
}
const auto loc = bdfDir.find_last_of('/');
auto bdf = bdfDir.substr(loc + 1);
std::replace(bdf.begin(), bdf.end(), ':', '_');
std::replace(bdf.begin(), bdf.end(), '.', '_');
// ID_PATH_TAG key is received when uevent related to device add/remove is generated.
// Example of ID_PATH_TAG is:
// ID_PATH_TAG=pci-0000_8c_00_0
pciIdPathTag = "pci-" + bdf;
}
LinuxEventsImp::LinuxEventsImp(OsSysman *pOsSysman) {
pLinuxSysmanImp = static_cast<LinuxSysmanImp *>(pOsSysman);
pSysfsAccess = &pLinuxSysmanImp->getSysfsAccess();
pFsAccess = &pLinuxSysmanImp->getFsAccess();
getPciIdPathTag();
}
OsEvents *OsEvents::create(OsSysman *pOsSysman) {
LinuxEventsImp *pLinuxEventsImp = new LinuxEventsImp(pOsSysman);
return static_cast<OsEvents *>(pLinuxEventsImp);
}
} // namespace L0
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