ac1368df50
This patch unifies how we deal with delayed packet deletion, where the receiving slave is responsible for deleting the packet, but the sending agent (e.g. a cache) is still relying on the pointer until the call to sendTimingReq completes. Previously we used a mix of a deletion vector and a construct using unique_ptr. With this patch we ensure all slaves use the latter approach.
109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
/*
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* Copyright (c) 2012 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) 2006 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: Ali Saidi
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* Andreas Hansson
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*/
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#ifndef __MEM_TPORT_HH__
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#define __MEM_TPORT_HH__
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/**
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* @file
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*
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* Declaration of SimpleTimingPort.
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*/
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#include "mem/qport.hh"
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/**
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* The simple timing port uses a queued port to implement
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* recvFunctional and recvTimingReq through recvAtomic. It is always a
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* slave port.
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*/
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class SimpleTimingPort : public QueuedSlavePort
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{
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private:
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/**
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* The packet queue used to store outgoing responses. Note that
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* the queue is made private and that we avoid overloading the
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* name used in the QueuedSlavePort. Access is provided through
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* the queue reference in the base class.
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*/
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RespPacketQueue queueImpl;
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protected:
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/** Implemented using recvAtomic(). */
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void recvFunctional(PacketPtr pkt);
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/** Implemented using recvAtomic(). */
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bool recvTimingReq(PacketPtr pkt);
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virtual Tick recvAtomic(PacketPtr pkt) = 0;
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/**
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* Upstream caches need this packet until true is returned, so
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* hold it for deletion until a subsequent call
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*/
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std::unique_ptr<Packet> pendingDelete;
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public:
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/**
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* Create a new SimpleTimingPort that relies on a packet queue to
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* hold responses, and implements recvTimingReq and recvFunctional
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* through calls to recvAtomic. Once a request arrives, it is
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* passed to recvAtomic, and in the case of a timing access any
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* response is scheduled to be sent after the delay of the atomic
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* operation.
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*
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* @param name port name
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* @param owner structural owner
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*/
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SimpleTimingPort(const std::string& name, MemObject* owner);
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virtual ~SimpleTimingPort() { }
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};
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#endif // __MEM_TPORT_HH__
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