src/cpu/testers/traffic_gen/base.hh - public/gem5 - Git at Google

 /*
  * Copyright (c) 2012-2013, 2016-2019 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_BASE_HH__
 #define __CPU_TRAFFIC_GEN_BASE_HH__

 #include <memory>
 #include <tuple>
 #include <unordered_map>

 #include "base/statistics.hh"
 #include "mem/qport.hh"
 #include "sim/clocked_object.hh"

 class BaseGen;
 class StreamGen;
 class System;
 struct BaseTrafficGenParams;

 /**
  * 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 BaseTrafficGen : public ClockedObject
 {
     friend class BaseGen;

   protected: // Params
     /**
      * The system used to determine which mode we are currently operating
      * in.
      */
     System *const system;

     /**
      * Determine whether to add elasticity in the request injection,
      * thus responding to backpressure by slowing things down.
      */
     const bool elasticReq;

     /**
      * Time to tolerate waiting for retries (not making progress),
      * until we declare things broken.
      */
     const Tick progressCheck;

   private:
     /**
      * Receive a retry from the neighbouring port and attempt to
      * resend the waiting packet.
      */
     void recvReqRetry();

     void retryReq();

     bool recvTimingResp(PacketPtr pkt);

     /** Transition to the next generator */
     void transition();

     /**
      * Schedule the update event based on nextPacketTick and
      * nextTransitionTick.
      */
     void scheduleUpdate();

     /**
      * Method to inform the user we have made no progress.
      */
     void noProgress();

     /**
      * Event to keep track of our progress, or lack thereof.
      */
     EventFunctionWrapper noProgressEvent;

     /** Time of next transition */
     Tick nextTransitionTick;

     /** Time of the next packet. */
     Tick nextPacketTick;

     const int maxOutstandingReqs;


     /** Master port specialisation for the traffic generator */
     class TrafficGenPort : public MasterPort
     {
       public:

         TrafficGenPort(const std::string& name, BaseTrafficGen& traffic_gen)
             : MasterPort(name, &traffic_gen), trafficGen(traffic_gen)
         { }

       protected:

         void recvReqRetry() { trafficGen.recvReqRetry(); }

         bool recvTimingResp(PacketPtr pkt)
         { return trafficGen.recvTimingResp(pkt); }

         void recvTimingSnoopReq(PacketPtr pkt) { }

         void recvFunctionalSnoop(PacketPtr pkt) { }

         Tick recvAtomicSnoop(PacketPtr pkt) { return 0; }

       private:

         BaseTrafficGen& trafficGen;

     };

     /**
      * Schedules event for next update and generates a new packet or
      * requests a new generatoir depending on the current time.
      */
     void update();

     /** 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;

     /** Set when we blocked waiting for outstanding reqs */
     bool blockedWaitingResp;

     /**
      * Puts this packet in the waitingResp list and returns true if
      * we are above the maximum number of oustanding requests.
      */
     bool allocateWaitingRespSlot(PacketPtr pkt)
     {
         assert(waitingResp.find(pkt->req) == waitingResp.end());
         assert(pkt->needsResponse());

         waitingResp[pkt->req] = curTick();

         return (maxOutstandingReqs > 0) &&
                (waitingResp.size() > maxOutstandingReqs);
     }

     /** Event for scheduling updates */
     EventFunctionWrapper updateEvent;

   protected: // Stats
     /** Reqs waiting for response **/
     std::unordered_map<RequestPtr,Tick> waitingResp;

     struct StatGroup : public Stats::Group {
         StatGroup(Stats::Group *parent);

         /** Count the number of dropped requests. */
         Stats::Scalar 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;

         /** Count the number of bytes read. */
         Stats::Scalar bytesRead;

         /** Count the number of bytes written. */
         Stats::Scalar bytesWritten;

         /** Total num of ticks read reqs took to complete  */
         Stats::Scalar totalReadLatency;

         /** Total num of ticks write reqs took to complete  */
         Stats::Scalar totalWriteLatency;

         /** Count the number reads. */
         Stats::Scalar totalReads;

         /** Count the number writes. */
         Stats::Scalar totalWrites;

         /** Avg num of ticks each read req took to complete  */
         Stats::Formula avgReadLatency;

         /** Avg num of ticks each write reqs took to complete  */
         Stats::Formula avgWriteLatency;

         /** Read bandwidth in bytes/s  */
         Stats::Formula readBW;

         /** Write bandwidth in bytes/s  */
         Stats::Formula writeBW;
     } stats;

   public:
     BaseTrafficGen(const BaseTrafficGenParams* p);

     ~BaseTrafficGen();

     Port &getPort(const std::string &if_name,
                   PortID idx=InvalidPortID) override;

     void init() override;

     DrainState drain() override;

     void serialize(CheckpointOut &cp) const override;
     void unserialize(CheckpointIn &cp) override;

   public: // Generator factory methods
     std::shared_ptr<BaseGen> createIdle(Tick duration);
     std::shared_ptr<BaseGen> createExit(Tick duration);

     std::shared_ptr<BaseGen> createLinear(
         Tick duration,
         Addr start_addr, Addr end_addr, Addr blocksize,
         Tick min_period, Tick max_period,
         uint8_t read_percent, Addr data_limit);

     std::shared_ptr<BaseGen> createRandom(
         Tick duration,
         Addr start_addr, Addr end_addr, Addr blocksize,
         Tick min_period, Tick max_period,
         uint8_t read_percent, Addr data_limit);

     std::shared_ptr<BaseGen> createDram(
         Tick duration,
         Addr start_addr, Addr end_addr, Addr blocksize,
         Tick min_period, Tick max_period,
         uint8_t read_percent, Addr data_limit,
         unsigned int num_seq_pkts, unsigned int page_size,
         unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util,
         unsigned int addr_mapping,
         unsigned int nbr_of_ranks);

     std::shared_ptr<BaseGen> createDramRot(
         Tick duration,
         Addr start_addr, Addr end_addr, Addr blocksize,
         Tick min_period, Tick max_period,
         uint8_t read_percent, Addr data_limit,
         unsigned int num_seq_pkts, unsigned int page_size,
         unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util,
         unsigned int addr_mapping,
         unsigned int nbr_of_ranks,
         unsigned int max_seq_count_per_rank);

     std::shared_ptr<BaseGen> createTrace(
         Tick duration,
         const std::string& trace_file, Addr addr_offset);

   protected:
     void start();

     virtual std::shared_ptr<BaseGen> nextGenerator() = 0;

     /**
      * MasterID used in generated requests.
      */
     const MasterID masterID;

     /** Currently active generator */
     std::shared_ptr<BaseGen> activeGenerator;

     /** Stream/SubStreamID Generator */
     std::unique_ptr<StreamGen> streamGenerator;
 };

 #endif //__CPU_TRAFFIC_GEN_BASE_HH__
	/*
	* Copyright (c) 2012-2013, 2016-2019 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_BASE_HH__
	#define __CPU_TRAFFIC_GEN_BASE_HH__

	#include <memory>
	#include <tuple>
	#include <unordered_map>

	#include "base/statistics.hh"
	#include "mem/qport.hh"
	#include "sim/clocked_object.hh"

	class BaseGen;
	class StreamGen;
	class System;
	struct BaseTrafficGenParams;

	/**
	* 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 BaseTrafficGen : public ClockedObject
	{
	friend class BaseGen;

	protected: // Params
	/**
	* The system used to determine which mode we are currently operating
	* in.
	*/
	System *const system;

	/**
	* Determine whether to add elasticity in the request injection,
	* thus responding to backpressure by slowing things down.
	*/
	const bool elasticReq;

	/**
	* Time to tolerate waiting for retries (not making progress),
	* until we declare things broken.
	*/
	const Tick progressCheck;

	private:
	/**
	* Receive a retry from the neighbouring port and attempt to
	* resend the waiting packet.
	*/
	void recvReqRetry();

	void retryReq();

	bool recvTimingResp(PacketPtr pkt);

	/** Transition to the next generator */
	void transition();

	/**
	* Schedule the update event based on nextPacketTick and
	* nextTransitionTick.
	*/
	void scheduleUpdate();

	/**
	* Method to inform the user we have made no progress.
	*/
	void noProgress();

	/**
	* Event to keep track of our progress, or lack thereof.
	*/
	EventFunctionWrapper noProgressEvent;

	/** Time of next transition */
	Tick nextTransitionTick;

	/** Time of the next packet. */
	Tick nextPacketTick;

	const int maxOutstandingReqs;


	/** Master port specialisation for the traffic generator */
	class TrafficGenPort : public MasterPort
	{
	public:

	TrafficGenPort(const std::string& name, BaseTrafficGen& traffic_gen)
	: MasterPort(name, &traffic_gen), trafficGen(traffic_gen)
	{ }

	protected:

	void recvReqRetry() { trafficGen.recvReqRetry(); }

	bool recvTimingResp(PacketPtr pkt)
	{ return trafficGen.recvTimingResp(pkt); }

	void recvTimingSnoopReq(PacketPtr pkt) { }

	void recvFunctionalSnoop(PacketPtr pkt) { }

	Tick recvAtomicSnoop(PacketPtr pkt) { return 0; }

	private:

	BaseTrafficGen& trafficGen;

	};

	/**
	* Schedules event for next update and generates a new packet or
	* requests a new generatoir depending on the current time.
	*/
	void update();

	/** 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;

	/** Set when we blocked waiting for outstanding reqs */
	bool blockedWaitingResp;

	/**
	* Puts this packet in the waitingResp list and returns true if
	* we are above the maximum number of oustanding requests.
	*/
	bool allocateWaitingRespSlot(PacketPtr pkt)
	{
	assert(waitingResp.find(pkt->req) == waitingResp.end());
	assert(pkt->needsResponse());

	waitingResp[pkt->req] = curTick();

	return (maxOutstandingReqs > 0) &&
	(waitingResp.size() > maxOutstandingReqs);
	}

	/** Event for scheduling updates */
	EventFunctionWrapper updateEvent;

	protected: // Stats
	/ Reqs waiting for response /
	std::unordered_map<RequestPtr,Tick> waitingResp;

	struct StatGroup : public Stats::Group {
	StatGroup(Stats::Group *parent);

	/** Count the number of dropped requests. */
	Stats::Scalar 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;

	/** Count the number of bytes read. */
	Stats::Scalar bytesRead;

	/** Count the number of bytes written. */
	Stats::Scalar bytesWritten;

	/** Total num of ticks read reqs took to complete */
	Stats::Scalar totalReadLatency;

	/** Total num of ticks write reqs took to complete */
	Stats::Scalar totalWriteLatency;

	/** Count the number reads. */
	Stats::Scalar totalReads;

	/** Count the number writes. */
	Stats::Scalar totalWrites;

	/** Avg num of ticks each read req took to complete */
	Stats::Formula avgReadLatency;

	/** Avg num of ticks each write reqs took to complete */
	Stats::Formula avgWriteLatency;

	/** Read bandwidth in bytes/s */
	Stats::Formula readBW;

	/** Write bandwidth in bytes/s */
	Stats::Formula writeBW;
	} stats;

	public:
	BaseTrafficGen(const BaseTrafficGenParams* p);

	~BaseTrafficGen();

	Port &getPort(const std::string &if_name,
	PortID idx=InvalidPortID) override;

	void init() override;

	DrainState drain() override;

	void serialize(CheckpointOut &cp) const override;
	void unserialize(CheckpointIn &cp) override;

	public: // Generator factory methods
	std::shared_ptr<BaseGen> createIdle(Tick duration);
	std::shared_ptr<BaseGen> createExit(Tick duration);

	std::shared_ptr<BaseGen> createLinear(
	Tick duration,
	Addr start_addr, Addr end_addr, Addr blocksize,
	Tick min_period, Tick max_period,
	uint8_t read_percent, Addr data_limit);

	std::shared_ptr<BaseGen> createRandom(
	Tick duration,
	Addr start_addr, Addr end_addr, Addr blocksize,
	Tick min_period, Tick max_period,
	uint8_t read_percent, Addr data_limit);

	std::shared_ptr<BaseGen> createDram(
	Tick duration,
	Addr start_addr, Addr end_addr, Addr blocksize,
	Tick min_period, Tick max_period,
	uint8_t read_percent, Addr data_limit,
	unsigned int num_seq_pkts, unsigned int page_size,
	unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util,
	unsigned int addr_mapping,
	unsigned int nbr_of_ranks);

	std::shared_ptr<BaseGen> createDramRot(
	Tick duration,
	Addr start_addr, Addr end_addr, Addr blocksize,
	Tick min_period, Tick max_period,
	uint8_t read_percent, Addr data_limit,
	unsigned int num_seq_pkts, unsigned int page_size,
	unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util,
	unsigned int addr_mapping,
	unsigned int nbr_of_ranks,
	unsigned int max_seq_count_per_rank);

	std::shared_ptr<BaseGen> createTrace(
	Tick duration,
	const std::string& trace_file, Addr addr_offset);

	protected:
	void start();

	virtual std::shared_ptr<BaseGen> nextGenerator() = 0;

	/**
	* MasterID used in generated requests.
	*/
	const MasterID masterID;

	/** Currently active generator */
	std::shared_ptr<BaseGen> activeGenerator;

	/** Stream/SubStreamID Generator */
	std::unique_ptr<StreamGen> streamGenerator;
	};

	#endif //__CPU_TRAFFIC_GEN_BASE_HH__