1/*
2 * Copyright (c) 2012 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
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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#ifndef __SIM_VOLTAGE_DOMAIN_HH__
42#define __SIM_VOLTAGE_DOMAIN_HH__
43
44#include <vector>
45
46#include "base/statistics.hh"
47#include "params/VoltageDomain.hh"
48#include "sim/clock_domain.hh"
49#include "sim/sim_object.hh"
50
51/**
52 * A VoltageDomain is used to group clock domains that operate under
53 * the same voltage. The class provides methods for setting and
54 * getting the voltage.
55 */
56class VoltageDomain : public SimObject
57{
58 public:
59
60 typedef VoltageDomainParams Params;
61 VoltageDomain(const Params *p);
62
| 1/*
2 * Copyright (c) 2012 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
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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#ifndef __SIM_VOLTAGE_DOMAIN_HH__
42#define __SIM_VOLTAGE_DOMAIN_HH__
43
44#include <vector>
45
46#include "base/statistics.hh"
47#include "params/VoltageDomain.hh"
48#include "sim/clock_domain.hh"
49#include "sim/sim_object.hh"
50
51/**
52 * A VoltageDomain is used to group clock domains that operate under
53 * the same voltage. The class provides methods for setting and
54 * getting the voltage.
55 */
56class VoltageDomain : public SimObject
57{
58 public:
59
60 typedef VoltageDomainParams Params;
61 VoltageDomain(const Params *p);
62
|
74 /**
75 * Set the voltage point of the domain.
76 * @param Voltage value to be set
77 */
78 void perfLevel(PerfLevel perf_level);
79
80 /**
81 * Get the voltage point of the domain.
82 * @param Voltage value to be set
83 */
84 PerfLevel perfLevel() const { return _perfLevel; }
85
86 /**
87 * Register a SrcClockDomain with this voltage domain.
88 * @param src_clock_domain The SrcClockDomain to register.
89 */
90 void registerSrcClockDom(SrcClockDomain *src_clock_dom) {
91 assert(src_clock_dom->voltageDomain() == this);
92 srcClockChildren.push_back(src_clock_dom);
93 }
94
95 /**
96 * Startup has all SrcClockDomains registered with this voltage domain, so
97 * try to make sure that all perf level requests from them are met.
98 */
99 void startup();
100
101 /**
102 * Recomputes the highest (fastest, i.e., numerically lowest) requested
103 * performance level of all associated clock domains, and updates the
104 * performance level of this voltage domain to match. This means that for
105 * two connected clock domains, one fast and one slow, the voltage domain
106 * will provide the voltage associated with the fast DVFS operation point.
107 * Must be called whenever a clock domain decides to swtich its performance
108 * level.
109 *
110 * @return True, if the voltage was actually changed.
111 */
112 bool sanitiseVoltages();
113
114 void regStats();
115
116 void serialize(std::ostream &os);
117 void unserialize(Checkpoint *cp, const std::string §ion);
118 private:
119 typedef std::vector<double> Voltages;
120 /**
121 * List of possible minimum voltage at each of the frequency operational
122 * points, should be in descending order and same size as freqOpPoints.
123 * An empty list corresponds to default voltage specified for the voltage
124 * domain its clock domain belongs. The same voltage is applied for each
125 * freqOpPoints, overall implying NO DVS
126 */
127 const Voltages voltageOpPoints;
128 PerfLevel _perfLevel;
129
130 /**
131 * Stat for reporting voltage of the domain
132 */
133 Stats::Value currentVoltage;
134
135 /**
136 * List of associated SrcClockDomains that are connected to this voltage
137 * domain.
138 */
139 typedef std::vector<SrcClockDomain *> SrcClockChildren;
140 SrcClockChildren srcClockChildren;
141};
142
143#endif
| 85 /**
86 * Set the voltage point of the domain.
87 * @param Voltage value to be set
88 */
89 void perfLevel(PerfLevel perf_level);
90
91 /**
92 * Get the voltage point of the domain.
93 * @param Voltage value to be set
94 */
95 PerfLevel perfLevel() const { return _perfLevel; }
96
97 /**
98 * Register a SrcClockDomain with this voltage domain.
99 * @param src_clock_domain The SrcClockDomain to register.
100 */
101 void registerSrcClockDom(SrcClockDomain *src_clock_dom) {
102 assert(src_clock_dom->voltageDomain() == this);
103 srcClockChildren.push_back(src_clock_dom);
104 }
105
106 /**
107 * Startup has all SrcClockDomains registered with this voltage domain, so
108 * try to make sure that all perf level requests from them are met.
109 */
110 void startup();
111
112 /**
113 * Recomputes the highest (fastest, i.e., numerically lowest) requested
114 * performance level of all associated clock domains, and updates the
115 * performance level of this voltage domain to match. This means that for
116 * two connected clock domains, one fast and one slow, the voltage domain
117 * will provide the voltage associated with the fast DVFS operation point.
118 * Must be called whenever a clock domain decides to swtich its performance
119 * level.
120 *
121 * @return True, if the voltage was actually changed.
122 */
123 bool sanitiseVoltages();
124
125 void regStats();
126
127 void serialize(std::ostream &os);
128 void unserialize(Checkpoint *cp, const std::string §ion);
129 private:
130 typedef std::vector<double> Voltages;
131 /**
132 * List of possible minimum voltage at each of the frequency operational
133 * points, should be in descending order and same size as freqOpPoints.
134 * An empty list corresponds to default voltage specified for the voltage
135 * domain its clock domain belongs. The same voltage is applied for each
136 * freqOpPoints, overall implying NO DVS
137 */
138 const Voltages voltageOpPoints;
139 PerfLevel _perfLevel;
140
141 /**
142 * Stat for reporting voltage of the domain
143 */
144 Stats::Value currentVoltage;
145
146 /**
147 * List of associated SrcClockDomains that are connected to this voltage
148 * domain.
149 */
150 typedef std::vector<SrcClockDomain *> SrcClockChildren;
151 SrcClockChildren srcClockChildren;
152};
153
154#endif
|