1/*
2 * Copyright (c) 2013-2014 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

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55#include "base/types.hh"
56#include "mem/packet.hh"
57#include "mem/request.hh"
58#include "sim/clocked_object.hh"
59#include "sim/probe/probe.hh"
60
61class BaseCache;
62struct BasePrefetcherParams;
63
64class BasePrefetcher : public ClockedObject
65{
66 class PrefetchListener : public ProbeListenerArgBase<PacketPtr>
67 {
68 public:
69 PrefetchListener(BasePrefetcher &_parent, ProbeManager *pm,
70 const std::string &name)

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84 BaseCache* cache;
85
86 /** The block size of the parent cache. */
87 unsigned blkSize;
88
89 /** log_2(block size of the parent cache). */
90 unsigned lBlkSize;
91
92 /** Only consult prefetcher on cache misses? */
93 const bool onMiss;
94
95 /** Consult prefetcher on reads? */
96 const bool onRead;
97
98 /** Consult prefetcher on reads? */
99 const bool onWrite;
100
101 /** Consult prefetcher on data accesses? */
102 const bool onData;
103
104 /** Consult prefetcher on instruction accesses? */
105 const bool onInst;
106
107 /** Request id for prefetches */
108 const MasterID masterId;
109
110 const Addr pageBytes;
111
112 /** Prefetch on every access, not just misses */
113 const bool prefetchOnAccess;
114
115 /** Determine if this access should be observed */
116 bool observeAccess(const PacketPtr &pkt) const;

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138 Stats::Scalar pfIssued;
139
140 public:
141
142 BasePrefetcher(const BasePrefetcherParams *p);
143
144 virtual ~BasePrefetcher() {}
145
146 void setCache(BaseCache *_cache);
147
148 /**
149 * Notify prefetcher of cache access (may be any access or just
150 * misses, depending on cache parameters.)
151 */
152 virtual void notify(const PacketPtr &pkt) = 0;
153
154 virtual PacketPtr getPacket() = 0;
155
156 virtual Tick nextPrefetchReadyTime() const = 0;
157
158 /**
159 * Register local statistics.
160 */
161 void regStats() override;
162
163 /**
164 * Register probe points for this object.
165 */
166 void regProbeListeners() override;
167
168 /**
169 * Process a notification event from the ProbeListener.

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