linear_gen.hh revision 12811:269967d5b4e4 
1/*
2 * Copyright (c) 2012-2013, 2017-2018 ARM Limited
3 * All rights reserved
4 *
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8 * to a hardware implementation of the functionality of the software
9 * licensed here under.  You may use the software subject to the license
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13 *
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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
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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
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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 *          Neha Agarwal
41 */
42
43/**
44 * @file
45 * Declaration of the linear generator that generates sequential
46 * requests.
47 */
48
49#ifndef __CPU_TRAFFIC_GEN_LINEAR_GEN_HH__
50#define __CPU_TRAFFIC_GEN_LINEAR_GEN_HH__
51
52#include "base/bitfield.hh"
53#include "base/intmath.hh"
54#include "base_gen.hh"
55#include "mem/packet.hh"
56
57/**
58 * The linear generator generates sequential requests from a
59 * start to an end address, with a fixed block size. A
60 * fraction of the requests are reads, as determined by the
61 * read percent. There is an optional data limit for when to
62 * stop generating new requests.
63 */
64class LinearGen : public StochasticGen
65{
66
67  public:
68
69    /**
70     * Create a linear address sequence generator. Set
71     * min_period == max_period for a fixed inter-transaction
72     * time.
73     *
74     * @param gen Traffic generator owning this sequence generator
75     * @param _duration duration of this state before transitioning
76     * @param start_addr Start address
77     * @param end_addr End address
78     * @param _blocksize Size used for transactions injected
79     * @param min_period Lower limit of random inter-transaction time
80     * @param max_period Upper limit of random inter-transaction time
81     * @param read_percent Percent of transactions that are reads
82     * @param data_limit Upper limit on how much data to read/write
83     */
84    LinearGen(BaseTrafficGen &gen, Tick _duration,
85              Addr start_addr, Addr end_addr, Addr _blocksize,
86              Tick min_period, Tick max_period,
87              uint8_t read_percent, Addr data_limit)
88        : StochasticGen(gen, _duration, start_addr, end_addr,
89                        _blocksize, min_period, max_period, read_percent,
90                        data_limit),
91          nextAddr(0),
92          dataManipulated(0)
93    { }
94
95    void enter();
96
97    PacketPtr getNextPacket();
98
99    Tick nextPacketTick(bool elastic, Tick delay) const;
100
101  private:
102    /** Address of next request */
103    Addr nextAddr;
104
105    /**
106     * Counter to determine the amount of data
107     * manipulated. Used to determine if we should continue
108     * generating requests.
109     */
110    Addr dataManipulated;
111};
112
113#endif
114