dram_gen.hh revision 12396 
1/*
2 * Copyright (c) 2012-2013, 2017 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 here under.  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 *          Neha Agarwal
41 */
42
43/**
44 * @file
45 * Declaration of the DRAM generator for issuing variable page
46 * hit length requests and bank utilisation.
47 */
48
49#ifndef __CPU_TRAFFIC_GEN_DRAM_GEN_HH__
50#define __CPU_TRAFFIC_GEN_DRAM_GEN_HH__
51
52#include "base/bitfield.hh"
53#include "base/intmath.hh"
54#include "mem/packet.hh"
55#include "proto/protoio.hh"
56#include "random_gen.hh"
57
58/**
59 * DRAM specific generator is for issuing request with variable page
60 * hit length and bank utilization. Currently assumes a single
61 * channel configuration.
62 */
63class DramGen : public RandomGen
64{
65
66  public:
67
68    /**
69     * Create a DRAM address sequence generator.
70     *
71     * @param _name Name to use for status and debug
72     * @param master_id MasterID set on each request
73     * @param _duration duration of this state before transitioning
74     * @param start_addr Start address
75     * @param end_addr End address
76     * @param _blocksize Size used for transactions injected
77     * @param min_period Lower limit of random inter-transaction time
78     * @param max_period Upper limit of random inter-transaction time
79     * @param read_percent Percent of transactions that are reads
80     * @param data_limit Upper limit on how much data to read/write
81     * @param num_seq_pkts Number of packets per stride, each of _blocksize
82     * @param page_size Page size (bytes) used in the DRAM
83     * @param nbr_of_banks_DRAM Total number of banks in DRAM
84     * @param nbr_of_banks_util Number of banks to utilized,
85     *                          for N banks, we will use banks: 0->(N-1)
86     * @param addr_mapping Address mapping to be used,
87     *                     0: RoCoRaBaCh, 1: RoRaBaCoCh/RoRaBaChCo
88     *                     assumes single channel system
89     */
90    DramGen(const std::string& _name, MasterID master_id, Tick _duration,
91            Addr start_addr, Addr end_addr, Addr _blocksize,
92            Tick min_period, Tick max_period,
93            uint8_t read_percent, Addr data_limit,
94            unsigned int num_seq_pkts, unsigned int page_size,
95            unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util,
96            unsigned int addr_mapping,
97            unsigned int nbr_of_ranks)
98        : RandomGen(_name, master_id, _duration, start_addr, end_addr,
99          _blocksize, min_period, max_period, read_percent, data_limit),
100          numSeqPkts(num_seq_pkts), countNumSeqPkts(0), addr(0),
101          isRead(true), pageSize(page_size),
102          pageBits(floorLog2(page_size / _blocksize)),
103          bankBits(floorLog2(nbr_of_banks_DRAM)),
104          blockBits(floorLog2(_blocksize)),
105          nbrOfBanksDRAM(nbr_of_banks_DRAM),
106          nbrOfBanksUtil(nbr_of_banks_util), addrMapping(addr_mapping),
107          rankBits(floorLog2(nbr_of_ranks)),
108          nbrOfRanks(nbr_of_ranks)
109    {
110        if (addrMapping != 1 && addrMapping != 0) {
111            addrMapping = 1;
112            warn("Unknown address mapping specified, using RoRaBaCoCh\n");
113        }
114    }
115
116    PacketPtr getNextPacket();
117
118    /** Insert bank, rank, and column bits into packed
119     *  address to create address for 1st command in a
120     *  series
121     * @param new_bank Bank number of next packet series
122     * @param new_rank Rank value of next packet series
123    */
124    void genStartAddr(unsigned int new_bank , unsigned int new_rank);
125
126  protected:
127
128    /** Number of sequential DRAM packets to be generated per cpu request */
129    const unsigned int numSeqPkts;
130
131    /** Track number of sequential packets generated for a request  */
132    unsigned int countNumSeqPkts;
133
134    /** Address of request */
135    Addr addr;
136
137    /** Remember type of requests to be generated in series */
138    bool isRead;
139
140    /** Page size of DRAM */
141    const unsigned int pageSize;
142
143    /** Number of page bits in DRAM address */
144    const unsigned int pageBits;
145
146    /** Number of bank bits in DRAM address*/
147    const unsigned int bankBits;
148
149    /** Number of block bits in DRAM address */
150    const unsigned int blockBits;
151
152    /** Number of banks in DRAM */
153    const unsigned int nbrOfBanksDRAM;
154
155    /** Number of banks to be utilized for a given configuration */
156    const unsigned int nbrOfBanksUtil;
157
158    /** Address mapping to be used */
159    unsigned int addrMapping;
160
161    /** Number of rank bits in DRAM address*/
162    const unsigned int rankBits;
163
164    /** Number of ranks to be utilized for a given configuration */
165    const unsigned int nbrOfRanks;
166
167};
168
169#endif
170