1/*
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
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 * Stephan Diestelhorst
40 */
41
42#include "debug/EnergyCtrl.hh"
43#include "dev/arm/energy_ctrl.hh"
44#include "mem/packet.hh"
45#include "mem/packet_access.hh"
46#include "params/EnergyCtrl.hh"
47#include "sim/dvfs_handler.hh"
48
49EnergyCtrl::EnergyCtrl(const Params *p)
50 : BasicPioDevice(p, PIO_NUM_FIELDS * 4), // each field is 32 bit
51 dvfsHandler(p->dvfs_handler),
52 domainID(0),
53 domainIDIndexToRead(0),
54 perfLevelAck(0),
55 perfLevelToRead(0),
56 updateAckEvent(this)
57{
58 fatal_if(!p->dvfs_handler, "EnergyCtrl: Needs a DVFSHandler for a "
59 "functioning system.\n");
60}
61
62Tick
63EnergyCtrl::read(PacketPtr pkt)
64{
65 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
66 assert(pkt->getSize() == 4);
67
68 Addr daddr = pkt->getAddr() - pioAddr;
69 assert((daddr & 3) == 0);
70 Registers reg = Registers(daddr / 4);
71
72 if (!dvfsHandler->isEnabled()) {
73 // NB: Zero is a good response if the handler is disabled
74 pkt->set<uint32_t>(0);
75 warn_once("EnergyCtrl: Disabled handler, ignoring read from reg %i\n",
76 reg);
77 DPRINTF(EnergyCtrl, "dvfs handler disabled, return 0 for read from "\
78 "reg %i\n", reg);
79 pkt->makeAtomicResponse();
80 return pioDelay;
81 }
82
83 uint32_t result = 0;
84 Tick period;
85 double voltage;
86
87 switch(reg) {
88 case DVFS_HANDLER_STATUS:
89 result = 1;
90 DPRINTF(EnergyCtrl, "dvfs handler enabled\n");
91 break;
92 case DVFS_NUM_DOMAINS:
93 result = dvfsHandler->numDomains();
94 DPRINTF(EnergyCtrl, "reading number of domains %d\n", result);
95 break;
96 case DVFS_DOMAINID_AT_INDEX:
97 result = dvfsHandler->domainID(domainIDIndexToRead);
98 DPRINTF(EnergyCtrl, "reading domain id at index %d as %d\n",
99 domainIDIndexToRead, result);
100 break;
101 case DVFS_HANDLER_TRANS_LATENCY:
102 // Return transition latency in nanoseconds
103 result = dvfsHandler->transLatency() / SimClock::Int::ns;
104 DPRINTF(EnergyCtrl, "reading dvfs handler trans latency %d ns\n",
105 result);
106 break;
107 case DOMAIN_ID:
108 result = domainID;
109 DPRINTF(EnergyCtrl, "reading domain id:%d\n", result);
110 break;
111 case PERF_LEVEL:
112 result = dvfsHandler->perfLevel(domainID);
113 DPRINTF(EnergyCtrl, "reading domain %d perf level: %d\n",
114 domainID, result);
115 break;
116 case PERF_LEVEL_ACK:
117 result = perfLevelAck;
118 DPRINTF(EnergyCtrl, "reading ack:%d\n", result);
119 // Signal is set for a single read only
120 if (result == 1)
121 perfLevelAck = 0;
122 break;
123 case NUM_OF_PERF_LEVELS:
124 result = dvfsHandler->numPerfLevels(domainID);
125 DPRINTF(EnergyCtrl, "reading num of perf level:%d\n", result);
126 break;
127 case FREQ_AT_PERF_LEVEL:
128 period = dvfsHandler->clkPeriodAtPerfLevel(domainID, perfLevelToRead);
129 result = ticksTokHz(period);
130 DPRINTF(EnergyCtrl, "reading freq %d KHz at perf level: %d\n",
131 result, perfLevelToRead);
132 break;
133 case VOLT_AT_PERF_LEVEL:
134 voltage = dvfsHandler->voltageAtPerfLevel(domainID, perfLevelToRead);
135 result = toMicroVolt(voltage);
136 DPRINTF(EnergyCtrl, "reading voltage %d u-volt at perf level: %d\n",
137 result, perfLevelToRead);
138 break;
139 default:
140 panic("Tried to read EnergyCtrl at offset %#x / reg %i\n", daddr,
141 reg);
142 }
143 pkt->set<uint32_t>(result);
144 pkt->makeAtomicResponse();
145 return pioDelay;
146}
147
148Tick
149EnergyCtrl::write(PacketPtr pkt)
150{
151 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
152 assert(pkt->getSize() == 4);
153
154 uint32_t data;
155 data = pkt->get<uint32_t>();
156
157 Addr daddr = pkt->getAddr() - pioAddr;
158 assert((daddr & 3) == 0);
159 Registers reg = Registers(daddr / 4);
160
161 if (!dvfsHandler->isEnabled()) {
162 // Ignore writes to a disabled controller
163 warn_once("EnergyCtrl: Disabled handler, ignoring write %u to "\
164 "reg %i\n", data, reg);
165 DPRINTF(EnergyCtrl, "dvfs handler disabled, ignoring write %u to "\
166 "reg %i\n", data, reg);
167 pkt->makeAtomicResponse();
168 return pioDelay;
169 }
170
171 switch(reg) {
172 case DVFS_DOMAINID_AT_INDEX:
173 domainIDIndexToRead = data;
174 DPRINTF(EnergyCtrl, "writing domain id index:%d\n",
175 domainIDIndexToRead);
176 break;
177 case DOMAIN_ID:
178 // Extra check to ensure that a valid domain ID is being queried
179 if (dvfsHandler->validDomainID(data)) {
180 domainID = data;
181 DPRINTF(EnergyCtrl, "writing domain id:%d\n", domainID);
182 } else {
183 DPRINTF(EnergyCtrl, "invalid domain id:%d\n", domainID);
184 }
185 break;
186 case PERF_LEVEL:
187 if (dvfsHandler->perfLevel(domainID, data)) {
188 if (updateAckEvent.scheduled()) {
189 // The OS driver is trying to change the perf level while
190 // another change is in flight. This is fine, but only a
191 // single acknowledgment will be sent.
192 DPRINTF(EnergyCtrl, "descheduling previous pending ack "\
193 "event\n");
194 deschedule(updateAckEvent);
195 }
196 schedule(updateAckEvent, curTick() + dvfsHandler->transLatency());
197 DPRINTF(EnergyCtrl, "writing domain %d perf level: %d\n",
198 domainID, data);
199 } else {
200 DPRINTF(EnergyCtrl, "invalid / ineffective perf level:%d for "\
201 "domain:%d\n", data, domainID);
202 }
203 break;
204 case PERF_LEVEL_TO_READ:
205 perfLevelToRead = data;
206 DPRINTF(EnergyCtrl, "writing perf level to read opp at: %d\n",
207 data);
208 break;
209 default:
210 panic("Tried to write EnergyCtrl at offset %#x\n", daddr);
211 break;
212 }
213
214 pkt->makeAtomicResponse();
215 return pioDelay;
216}
217
218void
| 1/*
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
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 * Stephan Diestelhorst
40 */
41
42#include "debug/EnergyCtrl.hh"
43#include "dev/arm/energy_ctrl.hh"
44#include "mem/packet.hh"
45#include "mem/packet_access.hh"
46#include "params/EnergyCtrl.hh"
47#include "sim/dvfs_handler.hh"
48
49EnergyCtrl::EnergyCtrl(const Params *p)
50 : BasicPioDevice(p, PIO_NUM_FIELDS * 4), // each field is 32 bit
51 dvfsHandler(p->dvfs_handler),
52 domainID(0),
53 domainIDIndexToRead(0),
54 perfLevelAck(0),
55 perfLevelToRead(0),
56 updateAckEvent(this)
57{
58 fatal_if(!p->dvfs_handler, "EnergyCtrl: Needs a DVFSHandler for a "
59 "functioning system.\n");
60}
61
62Tick
63EnergyCtrl::read(PacketPtr pkt)
64{
65 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
66 assert(pkt->getSize() == 4);
67
68 Addr daddr = pkt->getAddr() - pioAddr;
69 assert((daddr & 3) == 0);
70 Registers reg = Registers(daddr / 4);
71
72 if (!dvfsHandler->isEnabled()) {
73 // NB: Zero is a good response if the handler is disabled
74 pkt->set<uint32_t>(0);
75 warn_once("EnergyCtrl: Disabled handler, ignoring read from reg %i\n",
76 reg);
77 DPRINTF(EnergyCtrl, "dvfs handler disabled, return 0 for read from "\
78 "reg %i\n", reg);
79 pkt->makeAtomicResponse();
80 return pioDelay;
81 }
82
83 uint32_t result = 0;
84 Tick period;
85 double voltage;
86
87 switch(reg) {
88 case DVFS_HANDLER_STATUS:
89 result = 1;
90 DPRINTF(EnergyCtrl, "dvfs handler enabled\n");
91 break;
92 case DVFS_NUM_DOMAINS:
93 result = dvfsHandler->numDomains();
94 DPRINTF(EnergyCtrl, "reading number of domains %d\n", result);
95 break;
96 case DVFS_DOMAINID_AT_INDEX:
97 result = dvfsHandler->domainID(domainIDIndexToRead);
98 DPRINTF(EnergyCtrl, "reading domain id at index %d as %d\n",
99 domainIDIndexToRead, result);
100 break;
101 case DVFS_HANDLER_TRANS_LATENCY:
102 // Return transition latency in nanoseconds
103 result = dvfsHandler->transLatency() / SimClock::Int::ns;
104 DPRINTF(EnergyCtrl, "reading dvfs handler trans latency %d ns\n",
105 result);
106 break;
107 case DOMAIN_ID:
108 result = domainID;
109 DPRINTF(EnergyCtrl, "reading domain id:%d\n", result);
110 break;
111 case PERF_LEVEL:
112 result = dvfsHandler->perfLevel(domainID);
113 DPRINTF(EnergyCtrl, "reading domain %d perf level: %d\n",
114 domainID, result);
115 break;
116 case PERF_LEVEL_ACK:
117 result = perfLevelAck;
118 DPRINTF(EnergyCtrl, "reading ack:%d\n", result);
119 // Signal is set for a single read only
120 if (result == 1)
121 perfLevelAck = 0;
122 break;
123 case NUM_OF_PERF_LEVELS:
124 result = dvfsHandler->numPerfLevels(domainID);
125 DPRINTF(EnergyCtrl, "reading num of perf level:%d\n", result);
126 break;
127 case FREQ_AT_PERF_LEVEL:
128 period = dvfsHandler->clkPeriodAtPerfLevel(domainID, perfLevelToRead);
129 result = ticksTokHz(period);
130 DPRINTF(EnergyCtrl, "reading freq %d KHz at perf level: %d\n",
131 result, perfLevelToRead);
132 break;
133 case VOLT_AT_PERF_LEVEL:
134 voltage = dvfsHandler->voltageAtPerfLevel(domainID, perfLevelToRead);
135 result = toMicroVolt(voltage);
136 DPRINTF(EnergyCtrl, "reading voltage %d u-volt at perf level: %d\n",
137 result, perfLevelToRead);
138 break;
139 default:
140 panic("Tried to read EnergyCtrl at offset %#x / reg %i\n", daddr,
141 reg);
142 }
143 pkt->set<uint32_t>(result);
144 pkt->makeAtomicResponse();
145 return pioDelay;
146}
147
148Tick
149EnergyCtrl::write(PacketPtr pkt)
150{
151 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
152 assert(pkt->getSize() == 4);
153
154 uint32_t data;
155 data = pkt->get<uint32_t>();
156
157 Addr daddr = pkt->getAddr() - pioAddr;
158 assert((daddr & 3) == 0);
159 Registers reg = Registers(daddr / 4);
160
161 if (!dvfsHandler->isEnabled()) {
162 // Ignore writes to a disabled controller
163 warn_once("EnergyCtrl: Disabled handler, ignoring write %u to "\
164 "reg %i\n", data, reg);
165 DPRINTF(EnergyCtrl, "dvfs handler disabled, ignoring write %u to "\
166 "reg %i\n", data, reg);
167 pkt->makeAtomicResponse();
168 return pioDelay;
169 }
170
171 switch(reg) {
172 case DVFS_DOMAINID_AT_INDEX:
173 domainIDIndexToRead = data;
174 DPRINTF(EnergyCtrl, "writing domain id index:%d\n",
175 domainIDIndexToRead);
176 break;
177 case DOMAIN_ID:
178 // Extra check to ensure that a valid domain ID is being queried
179 if (dvfsHandler->validDomainID(data)) {
180 domainID = data;
181 DPRINTF(EnergyCtrl, "writing domain id:%d\n", domainID);
182 } else {
183 DPRINTF(EnergyCtrl, "invalid domain id:%d\n", domainID);
184 }
185 break;
186 case PERF_LEVEL:
187 if (dvfsHandler->perfLevel(domainID, data)) {
188 if (updateAckEvent.scheduled()) {
189 // The OS driver is trying to change the perf level while
190 // another change is in flight. This is fine, but only a
191 // single acknowledgment will be sent.
192 DPRINTF(EnergyCtrl, "descheduling previous pending ack "\
193 "event\n");
194 deschedule(updateAckEvent);
195 }
196 schedule(updateAckEvent, curTick() + dvfsHandler->transLatency());
197 DPRINTF(EnergyCtrl, "writing domain %d perf level: %d\n",
198 domainID, data);
199 } else {
200 DPRINTF(EnergyCtrl, "invalid / ineffective perf level:%d for "\
201 "domain:%d\n", data, domainID);
202 }
203 break;
204 case PERF_LEVEL_TO_READ:
205 perfLevelToRead = data;
206 DPRINTF(EnergyCtrl, "writing perf level to read opp at: %d\n",
207 data);
208 break;
209 default:
210 panic("Tried to write EnergyCtrl at offset %#x\n", daddr);
211 break;
212 }
213
214 pkt->makeAtomicResponse();
215 return pioDelay;
216}
217
218void
|