mem_delay.cc revision 12802:c861c5743fc0 
1/*
2 * Copyright (c) 2018 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: Andreas Sandberg
38 */
39
40#include "mem/mem_delay.hh"
41
42#include "params/MemDelay.hh"
43#include "params/SimpleMemDelay.hh"
44
45MemDelay::MemDelay(const MemDelayParams *p)
46    : MemObject(p),
47      masterPort(name() + "-master", *this),
48      slavePort(name() + "-slave", *this),
49      reqQueue(*this, masterPort),
50      respQueue(*this, slavePort),
51      snoopRespQueue(*this, masterPort)
52{
53}
54
55void
56MemDelay::init()
57{
58    if (!slavePort.isConnected() || !masterPort.isConnected())
59        fatal("Memory delay is not connected on both sides.\n");
60}
61
62
63BaseMasterPort&
64MemDelay::getMasterPort(const std::string& if_name, PortID idx)
65{
66    if (if_name == "master") {
67        return masterPort;
68    } else {
69        return MemObject::getMasterPort(if_name, idx);
70    }
71}
72
73BaseSlavePort&
74MemDelay::getSlavePort(const std::string& if_name, PortID idx)
75{
76    if (if_name == "slave") {
77        return slavePort;
78    } else {
79        return MemObject::getSlavePort(if_name, idx);
80    }
81}
82
83bool
84MemDelay::checkFunctional(PacketPtr pkt)
85{
86    return slavePort.checkFunctional(pkt) ||
87        masterPort.checkFunctional(pkt);
88}
89
90MemDelay::MasterPort::MasterPort(const std::string &_name, MemDelay &_parent)
91    : QueuedMasterPort(_name, &_parent,
92                       _parent.reqQueue, _parent.snoopRespQueue),
93      parent(_parent)
94{
95}
96
97bool
98MemDelay::MasterPort::recvTimingResp(PacketPtr pkt)
99{
100    const Tick when = curTick() + parent.delayResp(pkt);
101
102    parent.slavePort.schedTimingResp(pkt, when);
103
104    return true;
105}
106
107void
108MemDelay::MasterPort::recvFunctionalSnoop(PacketPtr pkt)
109{
110    if (parent.checkFunctional(pkt)) {
111        pkt->makeResponse();
112    } else {
113        parent.slavePort.sendFunctionalSnoop(pkt);
114    }
115}
116
117Tick
118MemDelay::MasterPort::recvAtomicSnoop(PacketPtr pkt)
119{
120    const Tick delay = parent.delaySnoopResp(pkt);
121
122    return delay + parent.slavePort.sendAtomicSnoop(pkt);
123}
124
125void
126MemDelay::MasterPort::recvTimingSnoopReq(PacketPtr pkt)
127{
128    parent.slavePort.sendTimingSnoopReq(pkt);
129}
130
131
132MemDelay::SlavePort::SlavePort(const std::string &_name, MemDelay &_parent)
133    : QueuedSlavePort(_name, &_parent, _parent.respQueue),
134      parent(_parent)
135{
136}
137
138Tick
139MemDelay::SlavePort::recvAtomic(PacketPtr pkt)
140{
141    const Tick delay = parent.delayReq(pkt) + parent.delayResp(pkt);
142
143    return delay + parent.masterPort.sendAtomic(pkt);
144}
145
146bool
147MemDelay::SlavePort::recvTimingReq(PacketPtr pkt)
148{
149    const Tick when = curTick() + parent.delayReq(pkt);
150
151    parent.masterPort.schedTimingReq(pkt, when);
152
153    return true;
154}
155
156void
157MemDelay::SlavePort::recvFunctional(PacketPtr pkt)
158{
159    if (parent.checkFunctional(pkt)) {
160        pkt->makeResponse();
161    } else {
162        parent.masterPort.sendFunctional(pkt);
163    }
164}
165
166bool
167MemDelay::SlavePort::recvTimingSnoopResp(PacketPtr pkt)
168{
169    const Tick when = curTick() + parent.delaySnoopResp(pkt);
170
171    parent.masterPort.schedTimingSnoopResp(pkt, when);
172
173    return true;
174}
175
176
177
178SimpleMemDelay::SimpleMemDelay(const SimpleMemDelayParams *p)
179    : MemDelay(p),
180      readReqDelay(p->read_req),
181      readRespDelay(p->read_resp),
182      writeReqDelay(p->write_req),
183      writeRespDelay(p->write_resp)
184{
185}
186
187Tick
188SimpleMemDelay::delayReq(PacketPtr pkt)
189{
190    if (pkt->isRead()) {
191        return readReqDelay;
192    } else if (pkt->isWrite()) {
193        return writeReqDelay;
194    } else {
195        return 0;
196    }
197}
198
199Tick
200SimpleMemDelay::delayResp(PacketPtr pkt)
201{
202    if (pkt->isRead()) {
203        return readRespDelay;
204    } else if (pkt->isWrite()) {
205        return writeRespDelay;
206    } else {
207        return 0;
208    }
209}
210
211
212SimpleMemDelay *
213SimpleMemDelayParams::create()
214{
215    return new SimpleMemDelay(this);
216}
217