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Diffstat (limited to 'src/mem/cache/prefetch/queued.hh')
-rw-r--r-- | src/mem/cache/prefetch/queued.hh | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/src/mem/cache/prefetch/queued.hh b/src/mem/cache/prefetch/queued.hh new file mode 100644 index 000000000..7ce9e7b93 --- /dev/null +++ b/src/mem/cache/prefetch/queued.hh @@ -0,0 +1,108 @@ +/* + * Copyright (c) 2014 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * 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: Mitch Hayenga + */ + +#ifndef __MEM_CACHE_PREFETCH_QUEUED_HH__ +#define __MEM_CACHE_PREFETCH_QUEUED_HH__ + +#include <list> + +#include "mem/cache/prefetch/base.hh" +#include "params/QueuedPrefetcher.hh" + +class QueuedPrefetcher : public BasePrefetcher +{ + protected: + struct DeferredPacket { + Tick tick; + PacketPtr pkt; + DeferredPacket(Tick t, PacketPtr p) : tick(t), pkt(p) {} + }; + + std::list<DeferredPacket> pfq; + + // PARAMETERS + + /** Maximum size of the prefetch queue */ + const unsigned queueSize; + + /** Cycles after generation when a prefetch can first be issued */ + const Cycles latency; + + /** Squash queued prefetch if demand access observed */ + const bool queueSquash; + + /** Filter prefetches if already queued */ + const bool queueFilter; + + /** Snoop the cache before generating prefetch (cheating basically) */ + const bool cacheSnoop; + + /** Tag prefetch with PC of generating access? */ + const bool tagPrefetch; + + bool inPrefetch(Addr address, bool is_secure) const; + + // STATS + Stats::Scalar pfIdentified; + Stats::Scalar pfBufferHit; + Stats::Scalar pfInCache; + Stats::Scalar pfRemovedFull; + Stats::Scalar pfSpanPage; + + public: + QueuedPrefetcher(const QueuedPrefetcherParams *p); + virtual ~QueuedPrefetcher(); + + Tick notify(const PacketPtr &pkt); + + // Note: This should really be pure virtual, but doesnt go well with params + virtual void calculatePrefetch(const PacketPtr &pkt, + std::vector<Addr> &addresses) = 0; + PacketPtr getPacket(); + + Tick nextPrefetchReadyTime() const + { + return pfq.empty() ? MaxTick : pfq.front().tick; + } + + void regStats(); +}; + +#endif //__MEM_CACHE_PREFETCH_QUEUED_HH__ + |