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
|
/*
* Copyright (c) 2012-2014 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Vasileios Spiliopoulos
* Akash Bagdia
*/
#include "sim/voltage_domain.hh"
#include <algorithm>
#include "base/statistics.hh"
#include "base/trace.hh"
#include "debug/VoltageDomain.hh"
#include "params/VoltageDomain.hh"
#include "sim/sim_object.hh"
VoltageDomain::VoltageDomain(const Params *p)
: SimObject(p), voltageOpPoints(p->voltage), _perfLevel(0)
{
fatal_if(voltageOpPoints.empty(), "DVFS: Empty set of voltages for "\
"voltage domain %s\n", name());
// Voltages must be sorted in descending order.
fatal_if(!std::is_sorted(voltageOpPoints.begin(), voltageOpPoints.end(),
std::greater<Voltages::value_type>()), "DVFS: Voltage operation "\
"points not in descending order for voltage domain %s\n",
name());
}
void
VoltageDomain::perfLevel(PerfLevel perf_level)
{
chatty_assert(perf_level < voltageOpPoints.size(),
"DVFS: Requested voltage ID %d is outside the known "\
"range for domain %s.\n", perf_level, name());
if (perf_level == _perfLevel) {
// Silently ignore identical overwrites
return;
}
_perfLevel = perf_level;
DPRINTF(VoltageDomain, "Setting voltage to %.3fV idx: %d for domain %s\n",
voltage(), perf_level, name());
}
bool
VoltageDomain::sanitiseVoltages()
{
if (numVoltages() == 1)
return false;
// Find the highest requested performance level and update the voltage
// domain with it
PerfLevel perf_max = (PerfLevel)-1;
for (auto dit = srcClockChildren.begin(); dit != srcClockChildren.end(); ++dit) {
SrcClockDomain* d = *dit;
chatty_assert(d->voltageDomain() == this, "DVFS: Clock domain %s "\
"(id: %d) should not be registered with voltage domain "\
"%s\n", d->name(), d->domainID(), name());
PerfLevel perf = d->perfLevel();
DPRINTF(VoltageDomain, "DVFS: Clock domain %s (id: %d) requests perf "\
"level %d\n", d->name(), d->domainID(), perf);
// NOTE: Descending sort of performance levels: 0 - fast, 5 - slow
if (perf < perf_max) {
DPRINTF(VoltageDomain, "DVFS: Updating max perf level %d -> %d\n",
perf_max, perf);
perf_max = perf;
}
}
DPRINTF(VoltageDomain, "DVFS: Setting perf level of voltage domain %s "\
"from %d to %d.\n", name(), perfLevel(), perf_max);
// Set the performance level
if (perf_max != perfLevel()) {
perfLevel(perf_max);
return true;
} else {
return false;
}
}
void
VoltageDomain::startup() {
bool changed = sanitiseVoltages();
if (changed) {
warn("DVFS: Perf level for voltage domain %s adapted to "\
"requested perf levels from source clock domains.\n", name());
}
}
void
VoltageDomain::regStats()
{
SimObject::regStats();
currentVoltage
.method(this, &VoltageDomain::voltage)
.name(params()->name + ".voltage")
.desc("Voltage in Volts")
;
}
VoltageDomain *
VoltageDomainParams::create()
{
return new VoltageDomain(this);
}
void
VoltageDomain::serialize(CheckpointOut &cp) const
{
SERIALIZE_SCALAR(_perfLevel);
}
void
VoltageDomain::unserialize(CheckpointIn &cp)
{
UNSERIALIZE_SCALAR(_perfLevel);
perfLevel(_perfLevel);
}
|
