base.hh revision 13892 
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
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Thomas Grass
38 *          Andreas Hansson
39 *          Sascha Bischoff
40 */
41
42#ifndef __CPU_TRAFFIC_GEN_BASE_HH__
43#define __CPU_TRAFFIC_GEN_BASE_HH__
44
45#include <memory>
46#include <tuple>
47
48#include "base/statistics.hh"
49#include "mem/qport.hh"
50#include "sim/clocked_object.hh"
51
52class BaseGen;
53class StreamGen;
54class System;
55struct BaseTrafficGenParams;
56
57/**
58 * The traffic generator is a master module that generates stimuli for
59 * the memory system, based on a collection of simple generator
60 * behaviours that are either probabilistic or based on traces. It can
61 * be used stand alone for creating test cases for interconnect and
62 * memory controllers, or function as a black box replacement for
63 * system components that are not yet modelled in detail, e.g. a video
64 * engine or baseband subsystem.
65 */
66class BaseTrafficGen : public ClockedObject
67{
68    friend class BaseGen;
69
70  protected: // Params
71    /**
72     * The system used to determine which mode we are currently operating
73     * in.
74     */
75    System *const system;
76
77    /**
78     * Determine whether to add elasticity in the request injection,
79     * thus responding to backpressure by slowing things down.
80     */
81    const bool elasticReq;
82
83    /**
84     * Time to tolerate waiting for retries (not making progress),
85     * until we declare things broken.
86     */
87    const Tick progressCheck;
88
89  private:
90    /**
91     * Receive a retry from the neighbouring port and attempt to
92     * resend the waiting packet.
93     */
94    void recvReqRetry();
95
96    /** Transition to the next generator */
97    void transition();
98
99    /**
100     * Schedule the update event based on nextPacketTick and
101     * nextTransitionTick.
102     */
103    void scheduleUpdate();
104
105    /**
106     * Method to inform the user we have made no progress.
107     */
108    void noProgress();
109
110    /**
111     * Event to keep track of our progress, or lack thereof.
112     */
113    EventFunctionWrapper noProgressEvent;
114
115    /** Time of next transition */
116    Tick nextTransitionTick;
117
118    /** Time of the next packet. */
119    Tick nextPacketTick;
120
121
122    /** Master port specialisation for the traffic generator */
123    class TrafficGenPort : public MasterPort
124    {
125      public:
126
127        TrafficGenPort(const std::string& name, BaseTrafficGen& traffic_gen)
128            : MasterPort(name, &traffic_gen), trafficGen(traffic_gen)
129        { }
130
131      protected:
132
133        void recvReqRetry() { trafficGen.recvReqRetry(); }
134
135        bool recvTimingResp(PacketPtr pkt);
136
137        void recvTimingSnoopReq(PacketPtr pkt) { }
138
139        void recvFunctionalSnoop(PacketPtr pkt) { }
140
141        Tick recvAtomicSnoop(PacketPtr pkt) { return 0; }
142
143      private:
144
145        BaseTrafficGen& trafficGen;
146
147    };
148
149    /**
150     * Schedules event for next update and generates a new packet or
151     * requests a new generatoir depending on the current time.
152     */
153    void update();
154
155    /** The instance of master port used by the traffic generator. */
156    TrafficGenPort port;
157
158    /** Packet waiting to be sent. */
159    PacketPtr retryPkt;
160
161    /** Tick when the stalled packet was meant to be sent. */
162    Tick retryPktTick;
163
164    /** Event for scheduling updates */
165    EventFunctionWrapper updateEvent;
166
167    /** Count the number of dropped requests. */
168    Stats::Scalar numSuppressed;
169
170  private: // Stats
171    /** Count the number of generated packets. */
172    Stats::Scalar numPackets;
173
174    /** Count the number of retries. */
175    Stats::Scalar numRetries;
176
177    /** Count the time incurred from back-pressure. */
178    Stats::Scalar retryTicks;
179
180  public:
181    BaseTrafficGen(const BaseTrafficGenParams* p);
182
183    ~BaseTrafficGen();
184
185    Port &getPort(const std::string &if_name,
186                  PortID idx=InvalidPortID) override;
187
188    void init() override;
189
190    DrainState drain() override;
191
192    void serialize(CheckpointOut &cp) const override;
193    void unserialize(CheckpointIn &cp) override;
194
195    /** Register statistics */
196    void regStats() override;
197
198  public: // Generator factory methods
199    std::shared_ptr<BaseGen> createIdle(Tick duration);
200    std::shared_ptr<BaseGen> createExit(Tick duration);
201
202    std::shared_ptr<BaseGen> createLinear(
203        Tick duration,
204        Addr start_addr, Addr end_addr, Addr blocksize,
205        Tick min_period, Tick max_period,
206        uint8_t read_percent, Addr data_limit);
207
208    std::shared_ptr<BaseGen> createRandom(
209        Tick duration,
210        Addr start_addr, Addr end_addr, Addr blocksize,
211        Tick min_period, Tick max_period,
212        uint8_t read_percent, Addr data_limit);
213
214    std::shared_ptr<BaseGen> createDram(
215        Tick duration,
216        Addr start_addr, Addr end_addr, Addr blocksize,
217        Tick min_period, Tick max_period,
218        uint8_t read_percent, Addr data_limit,
219        unsigned int num_seq_pkts, unsigned int page_size,
220        unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util,
221        unsigned int addr_mapping,
222        unsigned int nbr_of_ranks);
223
224    std::shared_ptr<BaseGen> createDramRot(
225        Tick duration,
226        Addr start_addr, Addr end_addr, Addr blocksize,
227        Tick min_period, Tick max_period,
228        uint8_t read_percent, Addr data_limit,
229        unsigned int num_seq_pkts, unsigned int page_size,
230        unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util,
231        unsigned int addr_mapping,
232        unsigned int nbr_of_ranks,
233        unsigned int max_seq_count_per_rank);
234
235    std::shared_ptr<BaseGen> createTrace(
236        Tick duration,
237        const std::string& trace_file, Addr addr_offset);
238
239  protected:
240    void start();
241
242    virtual std::shared_ptr<BaseGen> nextGenerator() = 0;
243
244    /**
245     * MasterID used in generated requests.
246     */
247    const MasterID masterID;
248
249    /** Currently active generator */
250    std::shared_ptr<BaseGen> activeGenerator;
251
252    /** Stream/SubStreamID Generator */
253    std::unique_ptr<StreamGen> streamGenerator;
254};
255
256#endif //__CPU_TRAFFIC_GEN_BASE_HH__
257