1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Erik Hallnor
* Dave Greene
*/
/**
* @file
* Miss Status and Handling Register (MSHR) definitions.
*/
#include <assert.h>
#include <string>
#include <vector>
#include "mem/cache/miss/mshr.hh"
#include "sim/root.hh" // for curTick
#include "sim/host.hh"
#include "base/misc.hh"
#include "mem/cache/cache.hh"
using namespace std;
MSHR::MSHR()
{
inService = false;
ntargets = 0;
threadNum = -1;
}
void
MSHR::allocate(Packet::Command cmd, Addr _addr, int _asid, int size,
Packet * &target)
{
addr = _addr;
if (target)
{
//Have a request, just use it
pkt = new Packet(target->req, cmd, Packet::Broadcast, size);
pkt->time = curTick;
pkt->allocate();
pkt->senderState = (Packet::SenderState *)this;
allocateTarget(target);
}
else
{
//need a request first
Request * req = new Request();
req->setPhys(addr, size, 0);
//Thread context??
pkt = new Packet(req, cmd, Packet::Broadcast, size);
pkt->time = curTick;
pkt->allocate();
pkt->senderState = (Packet::SenderState *)this;
}
}
// Since we aren't sure if data is being used, don't copy here.
/**
* @todo When we have a "global" data flag, might want to copy data here.
*/
void
MSHR::allocateAsBuffer(Packet * &target)
{
addr = target->getAddr();
asid = target->req->getAsid();
threadNum = target->req->getThreadNum();
pkt = new Packet(target->req, target->cmd, -1);
pkt->allocate();
pkt->senderState = (Packet::SenderState*)this;
pkt->time = curTick;
}
void
MSHR::deallocate()
{
assert(targets.empty());
assert(ntargets == 0);
pkt = NULL;
inService = false;
allocIter = NULL;
readyIter = NULL;
}
/*
* Adds a target to an MSHR
*/
void
MSHR::allocateTarget(Packet * &target)
{
//If we append an invalidate and we issued a read to the bus,
//but now have some pending writes, we need to move
//the invalidate to before the first non-read
if (inService && pkt->isRead() && target->isInvalidate()) {
std::list<Packet *> temp;
while (!targets.empty()) {
if (!targets.front()->isRead()) break;
//Place on top of temp stack
temp.push_front(targets.front());
//Remove from targets
targets.pop_front();
}
//Now that we have all the reads off until first non-read, we can
//place the invalidate on
targets.push_front(target);
//Now we pop off the temp_stack and put them back
while (!temp.empty()) {
targets.push_front(temp.front());
temp.pop_front();
}
}
else {
targets.push_back(target);
}
++ntargets;
assert(targets.size() == ntargets);
/**
* @todo really prioritize the target commands.
*/
if (!inService && target->isWrite()) {
pkt->cmd = Packet::WriteReq;
}
}
void
MSHR::dump()
{
ccprintf(cerr,
"inService: %d thread: %d\n"
"Addr: %x asid: %d ntargets %d\n"
"Targets:\n",
inService, threadNum, addr, asid, ntargets);
TargetListIterator tar_it = targets.begin();
for (int i = 0; i < ntargets; i++) {
assert(tar_it != targets.end());
ccprintf(cerr, "\t%d: Addr: %x cmd: %d\n",
i, (*tar_it)->getAddr(), (*tar_it)->cmdToIndex());
tar_it++;
}
ccprintf(cerr, "\n");
}
MSHR::~MSHR()
{
if (pkt)
pkt = NULL;
}
|
