blob: 7d27e429ac6bb6d2711293f15d9494f988dd1ce4 [file] [log] [blame]
/**
* Copyright 2017 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pidthread.hpp"
#include "pid/pidcontroller.hpp"
#include "sensors/sensor.hpp"
#include <chrono>
#include <map>
#include <memory>
#include <thread>
#include <vector>
static void processThermals(PIDZone* zone)
{
// Get the latest margins.
zone->updateSensors();
// Zero out the RPM set point goals.
zone->clearRPMSetPoints();
// Run the margin PIDs.
zone->processThermals();
// Get the maximum RPM set-point.
zone->determineMaxRPMRequest();
}
void pidControlThread(PIDZone* zone)
{
int ms100cnt = 0;
/*
* This should sleep on the conditional wait for the listen thread to tell
* us it's in sync. But then we also need a timeout option in case
* phosphor-hwmon is down, we can go into some weird failure more.
*
* Another approach would be to start all sensors in worst-case values,
* and fail-safe mode and then clear out of fail-safe mode once we start
* getting values. Which I think it is a solid approach.
*
* For now this runs before it necessarily has any sensor values. For the
* host sensors they start out in fail-safe mode. For the fans, they start
* out as 0 as input and then are adjusted once they have values.
*
* If a fan has failed, it's value will be whatever we're told or however
* we retrieve it. This program disregards fan values of 0, so any code
* providing a fan speed can set to 0 on failure and that fan value will be
* effectively ignored. The PID algorithm will be unhappy but nothing bad
* will happen.
*
* TODO(venture): If the fan value is 0 should that loop just be skipped?
* Right now, a 0 value is ignored in FanController::inputProc()
*/
#ifdef __TUNING_LOGGING__
zone->initializeLog();
#endif
zone->initializeCache();
processThermals(zone);
while (true)
{
using namespace std::literals::chrono_literals;
std::this_thread::sleep_for(0.1s);
// Check if we should just go back to sleep.
if (zone->getManualMode())
{
continue;
}
// Get the latest fan speeds.
zone->updateFanTelemetry();
if (10 <= ms100cnt)
{
ms100cnt = 0;
processThermals(zone);
}
// Run the fan PIDs every iteration.
zone->processFans();
#ifdef __TUNING_LOGGING__
zone->getLogHandle() << "," << zone->getFailSafeMode();
zone->getLogHandle() << std::endl;
#endif
ms100cnt += 1;
}
return;
}