1/* |
2 * Copyright (c) 2012-2013, 2016-2018 ARM Limited |
3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated --- 28 unchanged lines hidden (view full) --- 39 * Sascha Bischoff 40 */ 41 42#ifndef __CPU_TRAFFIC_GEN_TRAFFIC_GEN_HH__ 43#define __CPU_TRAFFIC_GEN_TRAFFIC_GEN_HH__ 44 45#include <unordered_map> 46 |
47#include "cpu/testers/traffic_gen/base.hh" |
48 |
49struct TrafficGenParams; 50 |
51/** 52 * The traffic generator is a master module that generates stimuli for |
53 * the memory system, based on a collection of simple behaviours that 54 * are either probabilistic or based on traces. It can be used stand 55 * alone for creating test cases for interconnect and memory 56 * controllers, or function as a black-box replacement for system 57 * components that are not yet modelled in detail, e.g. a video engine 58 * or baseband subsystem in an SoC. 59 * 60 * The traffic generator has a single master port that is used to send 61 * requests, independent of the specific behaviour. The behaviour of 62 * the traffic generator is specified in a configuration file, and this 63 * file describes a state transition graph where each state is a 64 * specific generator behaviour. Examples include idling, generating 65 * linear address sequences, random sequences and replay of captured 66 * traces. By describing these behaviours as states, it is straight 67 * forward to create very complex behaviours, simply by arranging them 68 * in graphs. The graph transitions can also be annotated with 69 * probabilities, effectively making it a Markov Chain. |
70 */ |
71class TrafficGen : public BaseTrafficGen |
72{ |
73 private: // Params |
74 /** |
75 * The config file to parse. |
76 */ |
77 const std::string configFile; |
78 |
79 private: |
80 /** |
81 * Resolve a file path in the configuration file. 82 * 83 * This method resolves a relative path to a file that has been 84 * referenced in the configuration file. It first tries to resolve 85 * the file relative to the configuration file's path. If that 86 * fails, it falls back to constructing a path relative to the 87 * current working directory. 88 * 89 * Absolute paths are returned unmodified. 90 * 91 * @param name Path to resolve 92 */ 93 std::string resolveFile(const std::string &name); 94 |
95 /** 96 * Parse the config file and build the state map and 97 * transition matrix. 98 */ |
99 void parseConfig(); 100 101 /** |
102 * Use the transition matrix to find the next state index. |
103 */ |
104 size_t nextState(); |
105 |
106 /** Struct to represent a probabilistic transition during parsing. */ 107 struct Transition { 108 uint32_t from; 109 uint32_t to; 110 double p; 111 }; 112 |
113 /** State transition matrix */ 114 std::vector<std::vector<double> > transitionMatrix; 115 116 /** Index of the current state */ 117 uint32_t currState; 118 119 /** Map of generator states */ |
120 std::unordered_map<uint32_t, std::shared_ptr<BaseGen>> states; |
121 |
122 protected: // BaseTrafficGen 123 std::shared_ptr<BaseGen> nextGenerator() override; |
124 |
125 public: 126 127 TrafficGen(const TrafficGenParams* p); 128 129 ~TrafficGen() {} 130 |
131 void init() override; |
132 void initState() override; 133 |
134 void serialize(CheckpointOut &cp) const override; 135 void unserialize(CheckpointIn &cp) override; 136 |
137}; 138 139#endif //__CPU_TRAFFIC_GEN_TRAFFIC_GEN_HH__ |