1 /**
2  * Copyright © 2017 IBM Corporation
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 #include "config.h"
17 
18 #include "pgood_monitor.hpp"
19 
20 #include "elog-errors.hpp"
21 #include "utility.hpp"
22 
23 #include <org/open_power/Witherspoon/Fault/error.hpp>
24 #include <phosphor-logging/log.hpp>
25 
26 namespace phosphor
27 {
28 namespace power
29 {
30 
31 constexpr auto POWER_OBJ_PATH = "/org/openbmc/control/power0";
32 constexpr auto POWER_INTERFACE = "org.openbmc.control.Power";
33 
34 using namespace phosphor::logging;
35 using namespace sdbusplus::org::open_power::Witherspoon::Fault::Error;
36 
37 bool PGOODMonitor::pgoodPending()
38 {
39     bool pending = false;
40     int32_t state = 0;
41     int32_t pgood = 0;
42 
43     auto service = util::getService(POWER_OBJ_PATH, POWER_INTERFACE, bus);
44 
45     util::getProperty<int32_t>(POWER_INTERFACE, "pgood", POWER_OBJ_PATH,
46                                service, bus, pgood);
47 
48     // When state = 1, system was switched on
49     util::getProperty<int32_t>(POWER_INTERFACE, "state", POWER_OBJ_PATH,
50                                service, bus, state);
51 
52     // On but no PGOOD
53     if (state && !pgood)
54     {
55         pending = true;
56     }
57 
58     return pending;
59 }
60 
61 void PGOODMonitor::analyze()
62 {
63     // Timer callback.
64     // The timer expired before it was stopped.
65     // If PGOOD is still pending (it should be),
66     // then there is a real failure.
67 
68     if (pgoodPending())
69     {
70 #ifdef DEVICE_ACCESS
71         device->onFailure();
72 #endif
73         report<PowerOnFailure>();
74     }
75 
76     // The pgood-wait service (with a longer timeout)
77     // will handle powering off the system.
78     timer.get_event().exit(EXIT_SUCCESS);
79 }
80 
81 void PGOODMonitor::propertyChanged()
82 {
83     // Multiple properties could have changed here.
84     // Keep things simple and just recheck the important ones.
85     if (!pgoodPending())
86     {
87         // PGOOD is on, or system is off, so we are done.
88         timer.get_event().exit(EXIT_SUCCESS);
89     }
90 }
91 
92 void PGOODMonitor::startListening()
93 {
94     match = std::make_unique<sdbusplus::bus::match_t>(
95         bus,
96         sdbusplus::bus::match::rules::propertiesChanged(POWER_OBJ_PATH,
97                                                         POWER_INTERFACE),
98         [this](auto&) { this->propertyChanged(); });
99 }
100 
101 int PGOODMonitor::run()
102 {
103     try
104     {
105         startListening();
106 
107         // If PGOOD came up before we got here, we're done.
108         // Otherwise if PGOOD doesn't get asserted before
109         // the timer expires, it's a failure.
110         if (!pgoodPending())
111         {
112             return EXIT_SUCCESS;
113         }
114 
115         return timer.get_event().loop();
116     }
117     catch (const std::exception& e)
118     {
119         log<level::ERR>(e.what());
120         log<level::ERR>("Unexpected failure prevented PGOOD checking");
121     }
122 
123     // Letting the service fail won't help anything, so don't do it.
124     return EXIT_SUCCESS;
125 }
126 
127 } // namespace power
128 } // namespace phosphor
129