1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
#include "watchdog.hpp"
#include <chrono>
#include <phosphor-logging/log.hpp>
namespace phosphor
{
namespace watchdog
{
using namespace std::chrono;
using namespace std::chrono_literals;
using namespace phosphor::logging;
// systemd service to kick start a target.
constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
constexpr auto SYSTEMD_ROOT = "/org/freedesktop/systemd1";
constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
void Watchdog::resetTimeRemaining(bool enableWatchdog)
{
timeRemaining(interval());
if (enableWatchdog)
{
enabled(true);
}
}
// Enable or disable watchdog
bool Watchdog::enabled(bool value)
{
if (!value)
{
// Make sure we accurately reflect our enabled state to the
// tryFallbackOrDisable() call
WatchdogInherits::enabled(value);
// Attempt to fallback or disable our timer if needed
tryFallbackOrDisable();
return false;
}
else if (!this->enabled())
{
// Start ONESHOT timer. Timer handles all in usec
auto usec = duration_cast<microseconds>(milliseconds(this->interval()));
// Update new expiration
timer.clearExpired();
timer.start(usec);
// Enable timer
timer.setEnabled<std::true_type>();
log<level::INFO>("watchdog: enabled and started",
entry("INTERVAL=%llu", this->interval()));
}
return WatchdogInherits::enabled(value);
}
// Get the remaining time before timer expires.
// If the timer is disabled, returns 0
uint64_t Watchdog::timeRemaining() const
{
uint64_t timeRemain = 0;
// timer may have already expired and disabled
if (timerEnabled())
{
// the one-shot timer does not expire yet
auto expiry = duration_cast<milliseconds>(timer.getRemaining());
// convert to msec per interface expectation.
auto timeNow = duration_cast<milliseconds>(Timer::getCurrentTime());
// Its possible that timer may have expired by now.
// So need to cross verify.
timeRemain = (expiry > timeNow) ? (expiry - timeNow).count() : 0;
}
return timeRemain;
}
// Reset the timer to a new expiration value
uint64_t Watchdog::timeRemaining(uint64_t value)
{
if (!timerEnabled())
{
// We don't need to update the timer because it is off
return 0;
}
if (!this->enabled())
{
// Having a timer but not displaying an enabled value means we
// are inside of the fallback
value = fallback->interval;
}
// Update new expiration
auto usec = duration_cast<microseconds>(milliseconds(value));
timer.start(usec);
// Update Base class data.
return WatchdogInherits::timeRemaining(value);
}
// Optional callback function on timer expiration
void Watchdog::timeOutHandler()
{
Action action = expireAction();
if (!this->enabled())
{
action = fallback->action;
}
auto target = actionTargetMap.find(action);
if (target == actionTargetMap.end())
{
log<level::INFO>("watchdog: Timed out with no target",
entry("ACTION=%s", convertForMessage(action).c_str()));
}
else
{
auto method = bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_ROOT,
SYSTEMD_INTERFACE, "StartUnit");
method.append(target->second);
method.append("replace");
log<level::INFO>("watchdog: Timed out",
entry("ACTION=%s", convertForMessage(action).c_str()),
entry("TARGET=%s", target->second.c_str()));
bus.call_noreply(method);
}
tryFallbackOrDisable();
}
void Watchdog::tryFallbackOrDisable()
{
// We only re-arm the watchdog if we were already enabled and have
// a possible fallback
if (fallback && (fallback->always || this->enabled()))
{
auto interval_ms = fallback->interval;
auto interval_us =
duration_cast<microseconds>(milliseconds(interval_ms));
timer.clearExpired();
timer.start(interval_us);
timer.setEnabled<std::true_type>();
log<level::INFO>("watchdog: falling back",
entry("INTERVAL=%llu", interval_ms));
}
else if (timerEnabled())
{
timer.setEnabled<std::false_type>();
log<level::INFO>("watchdog: disabled");
}
// Make sure we accurately reflect our enabled state to the
// dbus interface.
WatchdogInherits::enabled(false);
}
} // namespace watchdog
} // namespace phosphor
|
