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
63 typedef SrcClockDomain::PerfLevel PerfLevel;
64
65 /**
66 * Get the current voltage.
67 *
68 * @return Voltage of the domain
69 */
70 double voltage() const { return voltageOpPoints[_perfLevel]; }
71
72 /**
73 * Get the voltage at specified performance level.
74 *
75 * @param perf_level Performance level for which the voltage is requested
76 * @return Voltage of the domain at specified performance level
77 */
78 double voltage(PerfLevel perf_level) const
79 {
80 chatty_assert(perf_level < numVoltages(), "VoltageDomain %s "\
81 "request for voltage perf level %u is outside "\
82 "of numVoltages %u", name(), perf_level,
83 numVoltages());
84 return voltageOpPoints[perf_level];
85 }
86
87 uint32_t numVoltages() const { return (uint32_t)voltageOpPoints.size(); }
88
89 /**
90 * Set the voltage point of the domain.
91 * @param Voltage value to be set
92 */
93 void perfLevel(PerfLevel perf_level);
94
95 /**
96 * Get the voltage point of the domain.
97 * @param Voltage value to be set
98 */
99 PerfLevel perfLevel() const { return _perfLevel; }
100
101 /**
102 * Register a SrcClockDomain with this voltage domain.
103 * @param src_clock_domain The SrcClockDomain to register.
104 */
105 void registerSrcClockDom(SrcClockDomain *src_clock_dom) {
106 assert(src_clock_dom->voltageDomain() == this);
107 srcClockChildren.push_back(src_clock_dom);
108 }
109
110 /**
111 * Startup has all SrcClockDomains registered with this voltage domain, so
112 * try to make sure that all perf level requests from them are met.
113 */
114 void startup();
115
116 /**
117 * Recomputes the highest (fastest, i.e., numerically lowest) requested
118 * performance level of all associated clock domains, and updates the
119 * performance level of this voltage domain to match. This means that for
120 * two connected clock domains, one fast and one slow, the voltage domain
121 * will provide the voltage associated with the fast DVFS operation point.
122 * Must be called whenever a clock domain decides to swtich its performance
123 * level.
124 *
125 * @return True, if the voltage was actually changed.
126 */
127 bool sanitiseVoltages();
128
129 void regStats();
130
| 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
63 typedef SrcClockDomain::PerfLevel PerfLevel;
64
65 /**
66 * Get the current voltage.
67 *
68 * @return Voltage of the domain
69 */
70 double voltage() const { return voltageOpPoints[_perfLevel]; }
71
72 /**
73 * Get the voltage at specified performance level.
74 *
75 * @param perf_level Performance level for which the voltage is requested
76 * @return Voltage of the domain at specified performance level
77 */
78 double voltage(PerfLevel perf_level) const
79 {
80 chatty_assert(perf_level < numVoltages(), "VoltageDomain %s "\
81 "request for voltage perf level %u is outside "\
82 "of numVoltages %u", name(), perf_level,
83 numVoltages());
84 return voltageOpPoints[perf_level];
85 }
86
87 uint32_t numVoltages() const { return (uint32_t)voltageOpPoints.size(); }
88
89 /**
90 * Set the voltage point of the domain.
91 * @param Voltage value to be set
92 */
93 void perfLevel(PerfLevel perf_level);
94
95 /**
96 * Get the voltage point of the domain.
97 * @param Voltage value to be set
98 */
99 PerfLevel perfLevel() const { return _perfLevel; }
100
101 /**
102 * Register a SrcClockDomain with this voltage domain.
103 * @param src_clock_domain The SrcClockDomain to register.
104 */
105 void registerSrcClockDom(SrcClockDomain *src_clock_dom) {
106 assert(src_clock_dom->voltageDomain() == this);
107 srcClockChildren.push_back(src_clock_dom);
108 }
109
110 /**
111 * Startup has all SrcClockDomains registered with this voltage domain, so
112 * try to make sure that all perf level requests from them are met.
113 */
114 void startup();
115
116 /**
117 * Recomputes the highest (fastest, i.e., numerically lowest) requested
118 * performance level of all associated clock domains, and updates the
119 * performance level of this voltage domain to match. This means that for
120 * two connected clock domains, one fast and one slow, the voltage domain
121 * will provide the voltage associated with the fast DVFS operation point.
122 * Must be called whenever a clock domain decides to swtich its performance
123 * level.
124 *
125 * @return True, if the voltage was actually changed.
126 */
127 bool sanitiseVoltages();
128
129 void regStats();
130
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