summaryrefslogtreecommitdiff
path: root/src/mem/packet.cc
blob: 54769569791ad86f26d313a268864b3519a954bc (plain)
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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
 * Copyright (c) 2006 The Regents of The University of Michigan
 * Copyright (c) 2010 Advanced Micro Devices, Inc.
 * 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: Ali Saidi
 *          Steve Reinhardt
 */

/**
 * @file
 * Definition of the Packet Class, a packet is a transaction occuring
 * between a single level of the memory heirarchy (ie L1->L2).
 */

#include <iostream>
#include <cstring>
#include "base/cprintf.hh"
#include "base/misc.hh"
#include "base/trace.hh"
#include "mem/packet.hh"

using namespace std;

// The one downside to bitsets is that static initializers can get ugly.
#define SET1(a1)                     (1 << (a1))
#define SET2(a1, a2)                 (SET1(a1) | SET1(a2))
#define SET3(a1, a2, a3)             (SET2(a1, a2) | SET1(a3))
#define SET4(a1, a2, a3, a4)         (SET3(a1, a2, a3) | SET1(a4))
#define SET5(a1, a2, a3, a4, a5)     (SET4(a1, a2, a3, a4) | SET1(a5))
#define SET6(a1, a2, a3, a4, a5, a6) (SET5(a1, a2, a3, a4, a5) | SET1(a6))

const MemCmd::CommandInfo
MemCmd::commandInfo[] =
{
    /* InvalidCmd */
    { 0, InvalidCmd, "InvalidCmd" },
    /* ReadReq */
    { SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadReq" },
    /* ReadResp */
    { SET3(IsRead, IsResponse, HasData), InvalidCmd, "ReadResp" },
    /* ReadRespWithInvalidate */
    { SET4(IsRead, IsResponse, HasData, IsInvalidate),
            InvalidCmd, "ReadRespWithInvalidate" },
    /* WriteReq */
    { SET5(IsWrite, NeedsExclusive, IsRequest, NeedsResponse, HasData),
            WriteResp, "WriteReq" },
    /* WriteResp */
    { SET3(IsWrite, NeedsExclusive, IsResponse), InvalidCmd, "WriteResp" },
    /* Writeback */
    { SET4(IsWrite, NeedsExclusive, IsRequest, HasData),
            InvalidCmd, "Writeback" },
    /* SoftPFReq */
    { SET4(IsRead, IsRequest, IsSWPrefetch, NeedsResponse),
            SoftPFResp, "SoftPFReq" },
    /* HardPFReq */
    { SET4(IsRead, IsRequest, IsHWPrefetch, NeedsResponse),
            HardPFResp, "HardPFReq" },
    /* SoftPFResp */
    { SET4(IsRead, IsResponse, IsSWPrefetch, HasData),
            InvalidCmd, "SoftPFResp" },
    /* HardPFResp */
    { SET4(IsRead, IsResponse, IsHWPrefetch, HasData),
            InvalidCmd, "HardPFResp" },
    /* WriteInvalidateReq */
    { SET6(IsWrite, NeedsExclusive, IsInvalidate,
           IsRequest, HasData, NeedsResponse),
            WriteInvalidateResp, "WriteInvalidateReq" },
    /* WriteInvalidateResp */
    { SET3(IsWrite, NeedsExclusive, IsResponse),
            InvalidCmd, "WriteInvalidateResp" },
    /* UpgradeReq */
    { SET5(IsInvalidate, NeedsExclusive, IsUpgrade, IsRequest, NeedsResponse),
            UpgradeResp, "UpgradeReq" },
    /* SCUpgradeReq: response could be UpgradeResp or UpgradeFailResp */
    { SET6(IsInvalidate, NeedsExclusive, IsUpgrade, IsLlsc,
           IsRequest, NeedsResponse),
            UpgradeResp, "SCUpgradeReq" },
    /* UpgradeResp */
    { SET3(NeedsExclusive, IsUpgrade, IsResponse),
            InvalidCmd, "UpgradeResp" },
    /* SCUpgradeFailReq: generates UpgradeFailResp ASAP */
    { SET5(IsInvalidate, NeedsExclusive, IsLlsc,
           IsRequest, NeedsResponse),
            UpgradeFailResp, "SCUpgradeFailReq" },
    /* UpgradeFailResp */
    { SET2(NeedsExclusive, IsResponse),
            InvalidCmd, "UpgradeFailResp" },
    /* ReadExReq */
    { SET5(IsRead, NeedsExclusive, IsInvalidate, IsRequest, NeedsResponse),
            ReadExResp, "ReadExReq" },
    /* ReadExResp */
    { SET4(IsRead, NeedsExclusive, IsResponse, HasData),
            InvalidCmd, "ReadExResp" },
    /* LoadLockedReq: note that we use plain ReadResp as response, so that
     *                we can also use ReadRespWithInvalidate when needed */
    { SET4(IsRead, IsLlsc, IsRequest, NeedsResponse),
            ReadResp, "LoadLockedReq" },
    /* StoreCondReq */
    { SET6(IsWrite, NeedsExclusive, IsLlsc,
           IsRequest, NeedsResponse, HasData),
            StoreCondResp, "StoreCondReq" },
    /* StoreCondFailReq: generates failing StoreCondResp ASAP */
    { SET6(IsWrite, NeedsExclusive, IsLlsc,
           IsRequest, NeedsResponse, HasData),
            StoreCondResp, "StoreCondFailReq" },
    /* StoreCondResp */
    { SET4(IsWrite, NeedsExclusive, IsLlsc, IsResponse),
            InvalidCmd, "StoreCondResp" },
    /* SwapReq -- for Swap ldstub type operations */
    { SET6(IsRead, IsWrite, NeedsExclusive, IsRequest, HasData, NeedsResponse),
        SwapResp, "SwapReq" },
    /* SwapResp -- for Swap ldstub type operations */
    { SET5(IsRead, IsWrite, NeedsExclusive, IsResponse, HasData),
            InvalidCmd, "SwapResp" },
    /* IntReq -- for interrupts */
    { SET4(IsWrite, IsRequest, NeedsResponse, HasData),
        MessageResp, "MessageReq" },
    /* IntResp -- for interrupts */
    { SET2(IsWrite, IsResponse), InvalidCmd, "MessageResp" },
    /* NetworkNackError  -- nacked at network layer (not by protocol) */
    { SET2(IsResponse, IsError), InvalidCmd, "NetworkNackError" },
    /* InvalidDestError  -- packet dest field invalid */
    { SET2(IsResponse, IsError), InvalidCmd, "InvalidDestError" },
    /* BadAddressError   -- memory address invalid */
    { SET2(IsResponse, IsError), InvalidCmd, "BadAddressError" },
    /* PrintReq */
    { SET2(IsRequest, IsPrint), InvalidCmd, "PrintReq" },
    /* Flush Request */
    { SET3(IsRequest, IsFlush, NeedsExclusive), InvalidCmd, "FlushReq" }
};

bool
Packet::checkFunctional(Printable *obj, Addr addr, int size, uint8_t *data)
{
    Addr func_start = getAddr();
    Addr func_end   = getAddr() + getSize() - 1;
    Addr val_start  = addr;
    Addr val_end    = val_start + size - 1;

    if (func_start > val_end || val_start > func_end) {
        // no intersection
        return false;
    }

    // check print first since it doesn't require data
    if (isPrint()) {
        dynamic_cast<PrintReqState*>(senderState)->printObj(obj);
        return false;
    }

    // if there's no data, there's no need to look further
    if (!data) {
        return false;
    }

    // offset of functional request into supplied value (could be
    // negative if partial overlap)
    int offset = func_start - val_start;

    if (isRead()) {
        if (func_start >= val_start && func_end <= val_end) {
            allocate();
            memcpy(getPtr<uint8_t>(), data + offset, getSize());
            return true;
        } else {
            // In this case the timing packet only partially satisfies
            // the request, so we would need more information to make
            // this work.  Like bytes valid in the packet or
            // something, so the request could continue and get this
            // bit of possibly newer data along with the older data
            // not written to yet.
            panic("Memory value only partially satisfies the functional "
                  "request. Now what?");
        }
    } else if (isWrite()) {
        if (offset >= 0) {
            memcpy(data + offset, getPtr<uint8_t>(),
                   (min(func_end, val_end) - func_start) + 1);
        } else {
            // val_start > func_start
            memcpy(data, getPtr<uint8_t>() - offset,
                   (min(func_end, val_end) - val_start) + 1);
        }
    } else {
        panic("Don't know how to handle command %s\n", cmdString());
    }

    // keep going with request by default
    return false;
}

void
Packet::print(ostream &o, const int verbosity, const string &prefix) const
{
    ccprintf(o, "%s[%x:%x] %s\n", prefix,
             getAddr(), getAddr() + getSize() - 1, cmdString());
}

Packet::PrintReqState::PrintReqState(ostream &_os, int _verbosity)
    : curPrefixPtr(new string("")), os(_os), verbosity(_verbosity)
{
    labelStack.push_back(LabelStackEntry("", curPrefixPtr));
}

Packet::PrintReqState::~PrintReqState()
{
    labelStack.pop_back();
    assert(labelStack.empty());
    delete curPrefixPtr;
}

Packet::PrintReqState::
LabelStackEntry::LabelStackEntry(const string &_label, string *_prefix)
    : label(_label), prefix(_prefix), labelPrinted(false)
{
}

void
Packet::PrintReqState::pushLabel(const string &lbl, const string &prefix)
{
    labelStack.push_back(LabelStackEntry(lbl, curPrefixPtr));
    curPrefixPtr = new string(*curPrefixPtr);
    *curPrefixPtr += prefix;
}

void
Packet::PrintReqState::popLabel()
{
    delete curPrefixPtr;
    curPrefixPtr = labelStack.back().prefix;
    labelStack.pop_back();
    assert(!labelStack.empty());
}

void
Packet::PrintReqState::printLabels()
{
    if (!labelStack.back().labelPrinted) {
        LabelStack::iterator i = labelStack.begin();
        LabelStack::iterator end = labelStack.end();
        while (i != end) {
            if (!i->labelPrinted) {
                ccprintf(os, "%s%s\n", *(i->prefix), i->label);
                i->labelPrinted = true;
            }
            i++;
        }
    }
}


void
Packet::PrintReqState::printObj(Printable *obj)
{
    printLabels();
    obj->print(os, verbosity, curPrefix());
}