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/*
* Copyright (c) 2012-2013, 2015-2016 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.
*
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* All rights reserved.
*
* 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: Erik Hallnor
* Andreas Sandberg
*/
/** @file
* Definition of MSHRQueue class functions.
*/
#include "mem/cache/mshr_queue.hh"
using namespace std;
MSHRQueue::MSHRQueue(const std::string &_label,
int num_entries, int reserve, int demand_reserve)
: Queue<MSHR>(_label, num_entries, reserve),
demandReserve(demand_reserve)
{}
MSHR *
MSHRQueue::allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt,
Tick when_ready, Counter order, bool alloc_on_fill)
{
assert(!freeList.empty());
MSHR *mshr = freeList.front();
assert(mshr->getNumTargets() == 0);
freeList.pop_front();
mshr->allocate(blk_addr, blk_size, pkt, when_ready, order, alloc_on_fill);
mshr->allocIter = allocatedList.insert(allocatedList.end(), mshr);
mshr->readyIter = addToReadyList(mshr);
allocated += 1;
return mshr;
}
void
MSHRQueue::moveToFront(MSHR *mshr)
{
if (!mshr->inService) {
assert(mshr == *(mshr->readyIter));
readyList.erase(mshr->readyIter);
mshr->readyIter = readyList.insert(readyList.begin(), mshr);
}
}
void
MSHRQueue::markInService(MSHR *mshr, bool pending_modified_resp)
{
mshr->markInService(pending_modified_resp);
readyList.erase(mshr->readyIter);
_numInService += 1;
}
void
MSHRQueue::markPending(MSHR *mshr)
{
assert(mshr->inService);
mshr->inService = false;
--_numInService;
/**
* @ todo might want to add rerequests to front of pending list for
* performance.
*/
mshr->readyIter = addToReadyList(mshr);
}
bool
MSHRQueue::forceDeallocateTarget(MSHR *mshr)
{
bool was_full = isFull();
assert(mshr->hasTargets());
// Pop the prefetch off of the target list
mshr->popTarget();
// Delete mshr if no remaining targets
if (!mshr->hasTargets() && !mshr->promoteDeferredTargets()) {
deallocate(mshr);
}
// Notify if MSHR queue no longer full
return was_full && !isFull();
}
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