194 lines
5.8 KiB
C++
194 lines
5.8 KiB
C++
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/*
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* Copyright (c) 2012-2013, 2015-2016 ARM Limited
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* All rights reserved.
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2002-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Erik Hallnor
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* Andreas Hansson
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*/
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/**
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* @file
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* Write queue entry
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*/
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#ifndef __MEM_CACHE_WRITE_QUEUE_ENTRY_HH__
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#define __MEM_CACHE_WRITE_QUEUE_ENTRY_HH__
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#include <list>
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#include "base/printable.hh"
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#include "mem/cache/queue_entry.hh"
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class Cache;
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/**
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* Write queue entry
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*/
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class WriteQueueEntry : public QueueEntry, public Printable
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{
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/**
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* Consider the queues friends to avoid making everything public.
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*/
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template<typename Entry>
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friend class Queue;
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friend class WriteQueue;
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public:
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class Target {
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public:
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const Tick recvTime; //!< Time when request was received (for stats)
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const Tick readyTime; //!< Time when request is ready to be serviced
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const Counter order; //!< Global order (for memory consistency mgmt)
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const PacketPtr pkt; //!< Pending request packet.
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Target(PacketPtr _pkt, Tick _readyTime, Counter _order)
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: recvTime(curTick()), readyTime(_readyTime), order(_order),
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pkt(_pkt)
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{}
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};
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class TargetList : public std::list<Target> {
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public:
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TargetList() {}
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void add(PacketPtr pkt, Tick readyTime, Counter order);
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bool checkFunctional(PacketPtr pkt);
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void print(std::ostream &os, int verbosity,
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const std::string &prefix) const;
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};
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/** A list of write queue entriess. */
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typedef std::list<WriteQueueEntry *> List;
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/** WriteQueueEntry list iterator. */
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typedef List::iterator Iterator;
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bool sendPacket(Cache &cache);
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private:
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/**
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* Pointer to this entry on the ready list.
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* @sa MissQueue, WriteQueue::readyList
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*/
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Iterator readyIter;
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/**
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* Pointer to this entry on the allocated list.
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* @sa MissQueue, WriteQueue::allocatedList
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*/
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Iterator allocIter;
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/** List of all requests that match the address */
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TargetList targets;
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public:
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/** A simple constructor. */
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WriteQueueEntry() {}
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/**
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* Allocate a miss to this entry.
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* @param blk_addr The address of the block.
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* @param blk_size The number of bytes to request.
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* @param pkt The original write.
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* @param when_ready When should the write be sent out.
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* @param _order The logical order of this write.
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*/
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void allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt,
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Tick when_ready, Counter _order);
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/**
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* Mark this entry as free.
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*/
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void deallocate();
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/**
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* Returns the current number of allocated targets.
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* @return The current number of allocated targets.
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*/
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int getNumTargets() const
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{ return targets.size(); }
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/**
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* Returns true if there are targets left.
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* @return true if there are targets
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*/
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bool hasTargets() const { return !targets.empty(); }
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/**
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* Returns a reference to the first target.
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* @return A pointer to the first target.
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*/
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Target *getTarget()
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{
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assert(hasTargets());
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return &targets.front();
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}
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/**
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* Pop first target.
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*/
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void popTarget()
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{
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targets.pop_front();
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}
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bool checkFunctional(PacketPtr pkt);
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/**
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* Prints the contents of this MSHR for debugging.
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*/
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void print(std::ostream &os,
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int verbosity = 0,
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const std::string &prefix = "") const;
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/**
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* A no-args wrapper of print(std::ostream...) meant to be
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* invoked from DPRINTFs avoiding string overheads in fast mode
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*
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* @return string with mshr fields
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*/
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std::string print() const;
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};
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#endif // __MEM_CACHE_WRITE_QUEUE_ENTRY_HH__
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