xref: /openbmc/phosphor-pid-control/main.cpp (revision a4146eb1) 
1 /**
2  * Copyright 2017 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "config.h"
18 
19 #include "build/buildjson.hpp"
20 #include "conf.hpp"
21 #include "dbus/dbusconfiguration.hpp"
22 #include "interfaces.hpp"
23 #include "pid/builder.hpp"
24 #include "pid/buildjson.hpp"
25 #include "pid/pidloop.hpp"
26 #include "pid/tuning.hpp"
27 #include "pid/zone.hpp"
28 #include "sensors/builder.hpp"
29 #include "sensors/buildjson.hpp"
30 #include "sensors/manager.hpp"
31 #include "util.hpp"
32 
33 #include <CLI/CLI.hpp>
34 #include <boost/asio/io_context.hpp>
35 #include <boost/asio/steady_timer.hpp>
36 #include <sdbusplus/asio/connection.hpp>
37 #include <sdbusplus/bus.hpp>
38 #include <sdbusplus/server/manager.hpp>
39 
40 #include <chrono>
41 #include <filesystem>
42 #include <iostream>
43 #include <list>
44 #include <map>
45 #include <memory>
46 #include <thread>
47 #include <unordered_map>
48 #include <utility>
49 #include <vector>
50 
51 namespace pid_control
52 {
53 
54 /* The configuration converted sensor list. */
55 std::map<std::string, conf::SensorConfig> sensorConfig = {};
56 /* The configuration converted PID list. */
57 std::map<int64_t, conf::PIDConf> zoneConfig = {};
58 /* The configuration converted Zone configuration. */
59 std::map<int64_t, conf::ZoneConfig> zoneDetailsConfig = {};
60 
61 } // namespace pid_control
62 
63 /** the swampd daemon will check for the existence of this file. */
64 constexpr auto jsonConfigurationPath = "/usr/share/swampd/config.json";
65 std::string configPath = "";
66 
67 /* async io context for operation */
68 boost::asio::io_context io;
69 
70 /* buses for system control */
71 static sdbusplus::asio::connection modeControlBus(io);
72 static sdbusplus::asio::connection
73     hostBus(io, sdbusplus::bus::new_system().release());
74 static sdbusplus::asio::connection
75     passiveBus(io, sdbusplus::bus::new_system().release());
76 
77 namespace pid_control
78 {
79 
80 void restartControlLoops()
81 {
82     static SensorManager mgmr;
83     static std::unordered_map<int64_t, std::shared_ptr<ZoneInterface>> zones;
84     static std::vector<std::shared_ptr<boost::asio::steady_timer>> timers;
85     static bool isCanceling = false;
86 
87     for (const auto& timer : timers)
88     {
89         timer->cancel();
90     }
91     isCanceling = true;
92     timers.clear();
93 
94     if (zones.size() > 0 && zones.begin()->second.use_count() > 1)
95     {
96         throw std::runtime_error("wait for count back to 1");
97     }
98     zones.clear();
99     isCanceling = false;
100 
101     const std::string& path =
102         (configPath.length() > 0) ? configPath : jsonConfigurationPath;
103 
104     if (std::filesystem::exists(path))
105     {
106         /*
107          * When building the sensors, if any of the dbus passive ones aren't on
108          * the bus, it'll fail immediately.
109          */
110         try
111         {
112             auto jsonData = parseValidateJson(path);
113             sensorConfig = buildSensorsFromJson(jsonData);
114             std::tie(zoneConfig, zoneDetailsConfig) =
115                 buildPIDsFromJson(jsonData);
116         }
117         catch (const std::exception& e)
118         {
119             std::cerr << "Failed during building: " << e.what() << "\n";
120             exit(EXIT_FAILURE); /* fatal error. */
121         }
122     }
123     else
124     {
125         static boost::asio::steady_timer reloadTimer(io);
126         if (!dbus_configuration::init(modeControlBus, reloadTimer, sensorConfig,
127                                       zoneConfig, zoneDetailsConfig))
128         {
129             return; // configuration not ready
130         }
131     }
132 
133     mgmr = buildSensors(sensorConfig, passiveBus, hostBus);
134     zones = buildZones(zoneConfig, zoneDetailsConfig, mgmr, modeControlBus);
135 
136     if (0 == zones.size())
137     {
138         std::cerr << "No zones defined, exiting.\n";
139         std::exit(EXIT_FAILURE);
140     }
141 
142     for (const auto& i : zones)
143     {
144         std::shared_ptr<boost::asio::steady_timer> timer = timers.emplace_back(
145             std::make_shared<boost::asio::steady_timer>(io));
146         std::cerr << "pushing zone " << i.first << "\n";
147         pidControlLoop(i.second, timer, &isCanceling);
148     }
149 }
150 
151 void tryRestartControlLoops(bool first)
152 {
153     static int count = 0;
154     static const auto delayTime = std::chrono::seconds(10);
155     static boost::asio::steady_timer timer(io);
156     // try to start a control loop while the loop has been scheduled.
157     if (first && count != 0)
158     {
159         std::cerr
160             << "ControlLoops has been scheduled, refresh the loop count\n";
161         count = 1;
162         return;
163     }
164 
165     auto restartLbd = [](const boost::system::error_code& error) {
166         if (error == boost::asio::error::operation_aborted)
167         {
168             return;
169         }
170 
171         // for the last loop, don't elminate the failure of restartControlLoops.
172         if (count >= 5)
173         {
174             restartControlLoops();
175             // reset count after succesful restartControlLoops()
176             count = 0;
177             return;
178         }
179 
180         // retry when restartControlLoops() has some failure.
181         try
182         {
183             restartControlLoops();
184             // reset count after succesful restartControlLoops()
185             count = 0;
186         }
187         catch (const std::exception& e)
188         {
189             std::cerr << count
190                       << " Failed during restartControlLoops, try again: "
191                       << e.what() << "\n";
192             tryRestartControlLoops(false);
193         }
194     };
195     count++;
196     // first time of trying to restart the control loop without a delay
197     if (first)
198     {
199         boost::asio::post(io,
200                           std::bind(restartLbd, boost::system::error_code()));
201     }
202     // re-try control loop, set up a delay.
203     else
204     {
205         timer.expires_after(delayTime);
206         timer.async_wait(restartLbd);
207     }
208 
209     return;
210 }
211 
212 } // namespace pid_control
213 
214 int main(int argc, char* argv[])
215 {
216     loggingPath = "";
217     loggingEnabled = false;
218     tuningEnabled = false;
219 
220     CLI::App app{"OpenBMC Fan Control Daemon"};
221 
222     app.add_option("-c,--conf", configPath,
223                    "Optional parameter to specify configuration at run-time")
224         ->check(CLI::ExistingFile);
225     app.add_option("-l,--log", loggingPath,
226                    "Optional parameter to specify logging folder")
227         ->check(CLI::ExistingDirectory);
228     app.add_flag("-t,--tuning", tuningEnabled, "Enable or disable tuning");
229 
230     CLI11_PARSE(app, argc, argv);
231 
232     static constexpr auto loggingEnablePath = "/etc/thermal.d/logging";
233     static constexpr auto tuningEnablePath = "/etc/thermal.d/tuning";
234 
235     // Set up default logging path, preferring command line if it was given
236     std::string defLoggingPath(loggingPath);
237     if (defLoggingPath.empty())
238     {
239         defLoggingPath = std::filesystem::temp_directory_path();
240     }
241     else
242     {
243         // Enable logging, if user explicitly gave path on command line
244         loggingEnabled = true;
245     }
246 
247     // If this file exists, enable logging at runtime
248     std::ifstream fsLogging(loggingEnablePath);
249     if (fsLogging)
250     {
251         // The first line of file might be a valid directory path
252         std::getline(fsLogging, loggingPath);
253         fsLogging.close();
254 
255         // If so, use it, otherwise use default logging path instead
256         if (!(std::filesystem::exists(loggingPath)))
257         {
258             loggingPath = defLoggingPath;
259         }
260 
261         loggingEnabled = true;
262     }
263 
264     if (loggingEnabled)
265     {
266         std::cerr << "Logging enabled: " << loggingPath << "\n";
267     }
268 
269     // If this file exists, enable tuning at runtime
270     if (std::filesystem::exists(tuningEnablePath))
271     {
272         tuningEnabled = true;
273     }
274 
275     // This can also be enabled from the command line
276     if (tuningEnabled)
277     {
278         std::cerr << "Tuning enabled\n";
279     }
280 
281     static constexpr auto modeRoot = "/xyz/openbmc_project/settings/fanctrl";
282     // Create a manager for the ModeBus because we own it.
283     sdbusplus::server::manager::manager(
284         static_cast<sdbusplus::bus::bus&>(modeControlBus), modeRoot);
285     hostBus.request_name("xyz.openbmc_project.Hwmon.external");
286     modeControlBus.request_name("xyz.openbmc_project.State.FanCtrl");
287     sdbusplus::server::manager::manager objManager(modeControlBus, modeRoot);
288 
289     /*
290      * All sensors are managed by one manager, but each zone has a pointer to
291      * it.
292      */
293 
294     pid_control::tryRestartControlLoops();
295 
296     io.run();
297     return 0;
298 }
299