base.cc revision 12727:56c23b54bcb1 
1/*
2 * Copyright (c) 2013,2016 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 * Copyright (c) 2003-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Erik Hallnor
41 *          Ron Dreslinski
42 */
43
44/**
45 * @file
46 * Definitions of BaseTags.
47 */
48
49#include "mem/cache/tags/base.hh"
50
51#include <cassert>
52
53#include "base/types.hh"
54#include "mem/cache/base.hh"
55#include "mem/packet.hh"
56#include "mem/request.hh"
57#include "sim/core.hh"
58#include "sim/sim_exit.hh"
59#include "sim/system.hh"
60
61BaseTags::BaseTags(const Params *p)
62    : ClockedObject(p), blkSize(p->block_size), blkMask(blkSize - 1),
63      size(p->size),
64      lookupLatency(p->tag_latency),
65      accessLatency(p->sequential_access ?
66                    p->tag_latency + p->data_latency :
67                    std::max(p->tag_latency, p->data_latency)),
68      cache(nullptr),
69      warmupBound((p->warmup_percentage/100.0) * (p->size / p->block_size)),
70      warmedUp(false), numBlocks(p->size / p->block_size),
71      dataBlks(new uint8_t[p->size]) // Allocate data storage in one big chunk
72{
73}
74
75void
76BaseTags::setCache(BaseCache *_cache)
77{
78    assert(!cache);
79    cache = _cache;
80}
81
82void
83BaseTags::insertBlock(PacketPtr pkt, CacheBlk *blk)
84{
85    assert(!blk->isValid());
86
87    // Get address
88    Addr addr = pkt->getAddr();
89
90    // Previous block, if existed, has been removed, and now we have
91    // to insert the new one
92
93    // Deal with what we are bringing in
94    MasterID master_id = pkt->req->masterId();
95    assert(master_id < cache->system->maxMasters());
96    occupancies[master_id]++;
97
98    // Insert block with tag, src master id and task id
99    blk->insert(extractTag(addr), pkt->isSecure(), master_id,
100                pkt->req->taskId());
101
102    tagsInUse++;
103    if (!warmedUp && tagsInUse.value() >= warmupBound) {
104        warmedUp = true;
105        warmupCycle = curTick();
106    }
107
108    // We only need to write into one tag and one data block.
109    tagAccesses += 1;
110    dataAccesses += 1;
111}
112
113void
114BaseTags::regStats()
115{
116    ClockedObject::regStats();
117
118    using namespace Stats;
119
120    tagsInUse
121        .name(name() + ".tagsinuse")
122        .desc("Cycle average of tags in use")
123        ;
124
125    totalRefs
126        .name(name() + ".total_refs")
127        .desc("Total number of references to valid blocks.")
128        ;
129
130    sampledRefs
131        .name(name() + ".sampled_refs")
132        .desc("Sample count of references to valid blocks.")
133        ;
134
135    avgRefs
136        .name(name() + ".avg_refs")
137        .desc("Average number of references to valid blocks.")
138        ;
139
140    avgRefs = totalRefs/sampledRefs;
141
142    warmupCycle
143        .name(name() + ".warmup_cycle")
144        .desc("Cycle when the warmup percentage was hit.")
145        ;
146
147    occupancies
148        .init(cache->system->maxMasters())
149        .name(name() + ".occ_blocks")
150        .desc("Average occupied blocks per requestor")
151        .flags(nozero | nonan)
152        ;
153    for (int i = 0; i < cache->system->maxMasters(); i++) {
154        occupancies.subname(i, cache->system->getMasterName(i));
155    }
156
157    avgOccs
158        .name(name() + ".occ_percent")
159        .desc("Average percentage of cache occupancy")
160        .flags(nozero | total)
161        ;
162    for (int i = 0; i < cache->system->maxMasters(); i++) {
163        avgOccs.subname(i, cache->system->getMasterName(i));
164    }
165
166    avgOccs = occupancies / Stats::constant(numBlocks);
167
168    occupanciesTaskId
169        .init(ContextSwitchTaskId::NumTaskId)
170        .name(name() + ".occ_task_id_blocks")
171        .desc("Occupied blocks per task id")
172        .flags(nozero | nonan)
173        ;
174
175    ageTaskId
176        .init(ContextSwitchTaskId::NumTaskId, 5)
177        .name(name() + ".age_task_id_blocks")
178        .desc("Occupied blocks per task id")
179        .flags(nozero | nonan)
180        ;
181
182    percentOccsTaskId
183        .name(name() + ".occ_task_id_percent")
184        .desc("Percentage of cache occupancy per task id")
185        .flags(nozero)
186        ;
187
188    percentOccsTaskId = occupanciesTaskId / Stats::constant(numBlocks);
189
190    tagAccesses
191        .name(name() + ".tag_accesses")
192        .desc("Number of tag accesses")
193        ;
194
195    dataAccesses
196        .name(name() + ".data_accesses")
197        .desc("Number of data accesses")
198        ;
199
200    registerDumpCallback(new BaseTagsDumpCallback(this));
201    registerExitCallback(new BaseTagsCallback(this));
202}
203