voltage_domain.cc (10022:db307bac42fc) voltage_domain.cc (10249:6bbb7ae309ac)
1/*
1/*
2 * Copyright (c) 2012 ARM Limited
2 * Copyright (c) 2012-2014 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated

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33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Vasileios Spiliopoulos
38 * Akash Bagdia
39 */
40
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated

--- 22 unchanged lines hidden (view full) ---

33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Vasileios Spiliopoulos
38 * Akash Bagdia
39 */
40
41#include <algorithm>
42
43#include "base/statistics.hh"
41#include "debug/VoltageDomain.hh"
42#include "params/VoltageDomain.hh"
43#include "sim/sim_object.hh"
44#include "sim/voltage_domain.hh"
45
46VoltageDomain::VoltageDomain(const Params *p)
44#include "debug/VoltageDomain.hh"
45#include "params/VoltageDomain.hh"
46#include "sim/sim_object.hh"
47#include "sim/voltage_domain.hh"
48
49VoltageDomain::VoltageDomain(const Params *p)
47 : SimObject(p), _voltage(0)
50 : SimObject(p), voltageOpPoints(p->voltage), _perfLevel(0)
48{
51{
49 voltage(p->voltage);
52 fatal_if(voltageOpPoints.empty(), "DVFS: Empty set of voltages for "\
53 "voltage domain %s\n", name());
54
55 // Voltages must be sorted in descending order.
56 fatal_if(!std::is_sorted(voltageOpPoints.begin(), voltageOpPoints.end(),
57 std::greater_equal<Voltages::value_type>()), "DVFS: Voltage "\
58 "operation points not in descending order for voltage domain "\
59 "%s\n", name());
50}
51
52void
60}
61
62void
53VoltageDomain::voltage(double voltage)
63VoltageDomain::perfLevel(PerfLevel perf_level)
54{
64{
55 if (voltage <= 0) {
56 fatal("Voltage should be greater than zero.\n");
65 chatty_assert(perf_level < voltageOpPoints.size(),
66 "DVFS: Requested voltage ID %d is outside the known "\
67 "range for domain %s.\n", perf_level, name());
68
69 _perfLevel = perf_level;
70
71 DPRINTF(VoltageDomain, "Setting voltage to %.3fV idx: %d for domain %s\n",
72 voltage(), perf_level, name());
73}
74
75bool
76VoltageDomain::sanitiseVoltages()
77{
78 if (numVoltages() == 1)
79 return false;
80
81 // Find the highest requested performance level and update the voltage
82 // domain with it
83 PerfLevel perf_max = (PerfLevel)-1;
84 for (auto dit = srcClockChildren.begin(); dit != srcClockChildren.end(); ++dit) {
85 SrcClockDomain* d = *dit;
86 chatty_assert(d->voltageDomain() == this, "DVFS: Clock domain %s "\
87 "(id: %d) should not be registered with voltage domain "\
88 "%s\n", d->name(), d->domainID(), name());
89
90 PerfLevel perf = d->perfLevel();
91
92 DPRINTF(VoltageDomain, "DVFS: Clock domain %s (id: %d) requests perf "\
93 "level %d\n", d->name(), d->domainID(), perf);
94
95 // NOTE: Descending sort of performance levels: 0 - fast, 5 - slow
96 if (perf < perf_max) {
97 DPRINTF(VoltageDomain, "DVFS: Updating max perf level %d -> %d\n",
98 perf_max, perf);
99 perf_max = perf;
100 }
57 }
101 }
102 DPRINTF(VoltageDomain, "DVFS: Setting perf level of voltage domain %s "\
103 "from %d to %d.\n", name(), perfLevel(), perf_max);
58
104
59 _voltage = voltage;
60 DPRINTF(VoltageDomain,
61 "Setting voltage to %f for domain %s\n", _voltage, name());
105 // Set the performance level
106 if (perf_max != perfLevel()) {
107 perfLevel(perf_max);
108 return true;
109 } else {
110 return false;
111 }
62}
63
64void
112}
113
114void
115VoltageDomain::startup() {
116 bool changed = sanitiseVoltages();
117 if (changed) {
118 warn("DVFS: Perf level for voltage domain %s adapted to "\
119 "requested perf levels from source clock domains.\n", name());
120 }
121}
122
123void
65VoltageDomain::regStats()
66{
124VoltageDomain::regStats()
125{
67 using namespace Stats;
68
69 currentVoltage
126 currentVoltage
70 .scalar(_voltage)
127 .method(this, &VoltageDomain::voltage)
71 .name(params()->name + ".voltage")
72 .desc("Voltage in Volts")
73 ;
74}
75
76VoltageDomain *
77VoltageDomainParams::create()
78{
79 return new VoltageDomain(this);
80}
128 .name(params()->name + ".voltage")
129 .desc("Voltage in Volts")
130 ;
131}
132
133VoltageDomain *
134VoltageDomainParams::create()
135{
136 return new VoltageDomain(this);
137}
138
139void
140VoltageDomain::serialize(std::ostream &os) {
141 SERIALIZE_SCALAR(_perfLevel);
142}
143
144void
145VoltageDomain::unserialize(Checkpoint *cp, const std::string &section) {
146 UNSERIALIZE_SCALAR(_perfLevel);
147 perfLevel(_perfLevel);
148}