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/*
* Copyright (c) 2014, 2019 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
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "mem/cache/prefetch/multi.hh"
#include "params/MultiPrefetcher.hh"
namespace gem5
{
GEM5_DEPRECATED_NAMESPACE(Prefetcher, prefetch);
namespace prefetch
{
Multi::Multi(const MultiPrefetcherParams &p)
: Base(p),
prefetchers(p.prefetchers.begin(), p.prefetchers.end()),
lastChosenPf(0)
{
}
void
Multi::setCache(BaseCache *_cache)
{
for (auto pf : prefetchers)
pf->setCache(_cache);
}
Tick
Multi::nextPrefetchReadyTime() const
{
Tick next_ready = MaxTick;
for (auto pf : prefetchers)
next_ready = std::min(next_ready, pf->nextPrefetchReadyTime());
return next_ready;
}
PacketPtr
Multi::getPacket()
{
lastChosenPf = (lastChosenPf + 1) % prefetchers.size();
uint8_t pf_turn = lastChosenPf;
for (int pf = 0 ; pf < prefetchers.size(); pf++) {
if (prefetchers[pf_turn]->nextPrefetchReadyTime() <= curTick()) {
PacketPtr pkt = prefetchers[pf_turn]->getPacket();
panic_if(!pkt, "Prefetcher is ready but didn't return a packet.");
prefetchStats.pfIssued++;
issuedPrefetches++;
return pkt;
}
pf_turn = (pf_turn + 1) % prefetchers.size();
}
return nullptr;
}
} // namespace prefetch
} // namespace gem5