diff options
Diffstat (limited to 'src/cpu/testers/traffic_gen/traffic_gen.hh')
| -rw-r--r-- | src/cpu/testers/traffic_gen/traffic_gen.hh | 184 |
1 files changed, 35 insertions, 149 deletions
diff --git a/src/cpu/testers/traffic_gen/traffic_gen.hh b/src/cpu/testers/traffic_gen/traffic_gen.hh index 6c2c16382..5514e3be6 100644 --- a/src/cpu/testers/traffic_gen/traffic_gen.hh +++ b/src/cpu/testers/traffic_gen/traffic_gen.hh @@ -1,5 +1,5 @@ /* - * Copyright (c) 2012-2013, 2016-2017 ARM Limited + * Copyright (c) 2012-2013, 2016-2018 ARM Limited * All rights reserved * * The license below extends only to copyright in the software and shall @@ -44,45 +44,39 @@ #include <unordered_map> -#include "base/statistics.hh" -#include "cpu/testers/traffic_gen/base_gen.hh" -#include "cpu/testers/traffic_gen/dram_gen.hh" -#include "cpu/testers/traffic_gen/dram_rot_gen.hh" -#include "cpu/testers/traffic_gen/exit_gen.hh" -#include "cpu/testers/traffic_gen/idle_gen.hh" -#include "cpu/testers/traffic_gen/linear_gen.hh" -#include "cpu/testers/traffic_gen/random_gen.hh" -#include "cpu/testers/traffic_gen/trace_gen.hh" -#include "mem/mem_object.hh" -#include "mem/qport.hh" -#include "params/TrafficGen.hh" +#include "cpu/testers/traffic_gen/base.hh" + +struct TrafficGenParams; /** * 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. + * the memory system, based on a collection of simple 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 in an SoC. + * + * The traffic generator has a single master port that is used to send + * requests, independent of the specific behaviour. The behaviour of + * the traffic generator is specified in a configuration file, and this + * file describes a state transition graph where each state is a + * specific generator behaviour. Examples include idling, generating + * linear address sequences, random sequences and replay of captured + * traces. By describing these behaviours as states, it is straight + * forward to create very complex behaviours, simply by arranging them + * in graphs. The graph transitions can also be annotated with + * probabilities, effectively making it a Markov Chain. */ -class TrafficGen : public MemObject +class TrafficGen : public BaseTrafficGen { - - private: - + private: // Params /** - * Determine next state and perform the transition. - */ - void transition(); - - /** - * Enter a new state. - * - * @param newState identifier of state to enter + * The config file to parse. */ - void enterState(uint32_t newState); + const std::string configFile; + private: /** * Resolve a file path in the configuration file. * @@ -98,29 +92,16 @@ class TrafficGen : public MemObject */ std::string resolveFile(const std::string &name); - /** - * Parse the config file and build the state map and - * transition matrix. - */ + /** + * 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. + * Use the transition matrix to find the next state index. */ - void recvReqRetry(); - - /** - * Method to inform the user we have made no progress. - */ - void noProgress(); + size_t nextState(); /** Struct to represent a probabilistic transition during parsing. */ struct Transition { @@ -129,45 +110,6 @@ class TrafficGen : public MemObject 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 to tolerate waiting for retries (not making progress), - * until we declare things broken. - */ - const Tick progressCheck; - - /** - * 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; - /** State transition matrix */ std::vector<std::vector<double> > transitionMatrix; @@ -175,57 +117,10 @@ class TrafficGen : public MemObject 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) { } + std::unordered_map<uint32_t, std::shared_ptr<BaseGen>> states; - 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 */ - EventFunctionWrapper 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; + protected: // BaseTrafficGen + std::shared_ptr<BaseGen> nextGenerator() override; public: @@ -233,21 +128,12 @@ class TrafficGen : public MemObject ~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__ |