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/*
* Copyright (c) 2012-2013 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
* 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: Thomas Grass
* Andreas Hansson
* Sascha Bischoff
*/
#ifndef __CPU_TRAFFIC_GEN_TRAFFIC_GEN_HH__
#define __CPU_TRAFFIC_GEN_TRAFFIC_GEN_HH__
#include <unordered_map>
#include "base/statistics.hh"
#include "cpu/testers/traffic_gen/generators.hh"
#include "mem/mem_object.hh"
#include "mem/qport.hh"
#include "params/TrafficGen.hh"
/**
* The traffic generator is a master module that generates stimuli for
* the memory system, based on a collection of simple generator
* behaviours that are either probabilistic or based on traces. It can
* be used stand alone for creating test cases for interconnect and
* memory controllers, or function as a black box replacement for
* system components that are not yet modelled in detail, e.g. a video
* engine or baseband subsystem.
*/
class TrafficGen : public MemObject
{
private:
/**
* Determine next state and perform the transition.
*/
void transition();
/**
* Enter a new state.
*
* @param newState identifier of state to enter
*/
void enterState(uint32_t newState);
/**
* Parse the config file and build the state map and
* transition matrix.
*/
void parseConfig();
/**
* Schedules event for next update and executes an update on the
* state graph, either performing a state transition or executing
* the current state, depending on the current time.
*/
void update();
/**
* Receive a retry from the neighbouring port and attempt to
* resend the waiting packet.
*/
void recvReqRetry();
/** Struct to represent a probabilistic transition during parsing. */
struct Transition {
uint32_t from;
uint32_t to;
double p;
};
/**
* The system used to determine which mode we are currently operating
* in.
*/
System* system;
/**
* MasterID used in generated requests.
*/
MasterID masterID;
/**
* The config file to parse.
*/
const std::string configFile;
/**
* Determine whether to add elasticity in the request injection,
* thus responding to backpressure by slowing things down.
*/
const bool elasticReq;
/** Time of next transition */
Tick nextTransitionTick;
/** Time of the next packet. */
Tick nextPacketTick;
/** State transition matrix */
std::vector<std::vector<double> > transitionMatrix;
/** Index of the current state */
uint32_t currState;
/** Map of generator states */
std::unordered_map<uint32_t, BaseGen*> states;
/** Master port specialisation for the traffic generator */
class TrafficGenPort : public MasterPort
{
public:
TrafficGenPort(const std::string& name, TrafficGen& traffic_gen)
: MasterPort(name, &traffic_gen), trafficGen(traffic_gen)
{ }
protected:
void recvReqRetry() { trafficGen.recvReqRetry(); }
bool recvTimingResp(PacketPtr pkt);
void recvTimingSnoopReq(PacketPtr pkt) { }
void recvFunctionalSnoop(PacketPtr pkt) { }
Tick recvAtomicSnoop(PacketPtr pkt) { return 0; }
private:
TrafficGen& trafficGen;
};
/** The instance of master port used by the traffic generator. */
TrafficGenPort port;
/** Packet waiting to be sent. */
PacketPtr retryPkt;
/** Tick when the stalled packet was meant to be sent. */
Tick retryPktTick;
/** Event for scheduling updates */
EventWrapper<TrafficGen, &TrafficGen::update> updateEvent;
uint64_t numSuppressed;
/** Count the number of generated packets. */
Stats::Scalar numPackets;
/** Count the number of retries. */
Stats::Scalar numRetries;
/** Count the time incurred from back-pressure. */
Stats::Scalar retryTicks;
public:
TrafficGen(const TrafficGenParams* p);
~TrafficGen() {}
BaseMasterPort& getMasterPort(const std::string &if_name,
PortID idx = InvalidPortID) override;
void init() override;
void initState() override;
DrainState drain() override;
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
/** Register statistics */
void regStats() override;
};
#endif //__CPU_TRAFFIC_GEN_TRAFFIC_GEN_HH__
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