src/mem/cache/prefetch/multi.cc

/*
 * Copyright (c) 2014, 2019 ARM Limited
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 *
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 * 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
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 * 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,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 *
 * Authors: Mitch Hayenga
 *          Andreas Sandberg
 */

#include "mem/cache/prefetch/multi.hh"

#include "params/MultiPrefetcher.hh"

MultiPrefetcher::MultiPrefetcher(const MultiPrefetcherParams *p)
    : BasePrefetcher(p),
      prefetchers(p->prefetchers.begin(), p->prefetchers.end())
{
}

void
MultiPrefetcher::setCache(BaseCache *_cache)
{
    for (auto pf : prefetchers)
        pf->setCache(_cache);
}

Tick
MultiPrefetcher::nextPrefetchReadyTime() const
{
    Tick next_ready = MaxTick;

    for (auto pf : prefetchers)
        next_ready = std::min(next_ready, pf->nextPrefetchReadyTime());

    return next_ready;
}

PacketPtr
MultiPrefetcher::getPacket()
{
    for (auto pf : prefetchers) {
        if (pf->nextPrefetchReadyTime() <= curTick()) {
            PacketPtr pkt = pf->getPacket();
            panic_if(!pkt, "Prefetcher is ready but didn't return a packet.");
            return pkt;
        }
    }

    return nullptr;
}


MultiPrefetcher*
MultiPrefetcherParams::create()
{
    return new MultiPrefetcher(this);
}