2 * Copyright (c) 2014 ARM Limited
5 * The license below extends only to copyright in the software and shall
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9 * licensed hereunder. You may use the software subject to the license
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23 * this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 * Authors: Mitch Hayenga
40 #ifndef __MEM_CACHE_PREFETCH_QUEUED_HH__
41 #define __MEM_CACHE_PREFETCH_QUEUED_HH__
45 #include "mem/cache/prefetch/base.hh"
46 #include "params/QueuedPrefetcher.hh"
48 class QueuedPrefetcher : public BasePrefetcher
51 struct DeferredPacket {
54 DeferredPacket(Tick t, PacketPtr p) : tick(t), pkt(p) {}
57 std::list<DeferredPacket> pfq;
61 /** Maximum size of the prefetch queue */
62 const unsigned queueSize;
64 /** Cycles after generation when a prefetch can first be issued */
67 /** Squash queued prefetch if demand access observed */
68 const bool queueSquash;
70 /** Filter prefetches if already queued */
71 const bool queueFilter;
73 /** Snoop the cache before generating prefetch (cheating basically) */
74 const bool cacheSnoop;
76 /** Tag prefetch with PC of generating access? */
77 const bool tagPrefetch;
79 bool inPrefetch(Addr address, bool is_secure) const;
82 Stats::Scalar pfIdentified;
83 Stats::Scalar pfBufferHit;
84 Stats::Scalar pfInCache;
85 Stats::Scalar pfRemovedFull;
86 Stats::Scalar pfSpanPage;
89 QueuedPrefetcher(const QueuedPrefetcherParams *p);
90 virtual ~QueuedPrefetcher();
92 Tick notify(const PacketPtr &pkt);
94 // Note: This should really be pure virtual, but doesnt go well with params
95 virtual void calculatePrefetch(const PacketPtr &pkt,
96 std::vector<Addr> &addresses) = 0;
97 PacketPtr getPacket();
99 Tick nextPrefetchReadyTime() const
101 return pfq.empty() ? MaxTick : pfq.front().tick;
107 #endif //__MEM_CACHE_PREFETCH_QUEUED_HH__