Sequencer.hh revision 9501:378817542866 
1/*
2 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __MEM_RUBY_SYSTEM_SEQUENCER_HH__
30#define __MEM_RUBY_SYSTEM_SEQUENCER_HH__
31
32#include <iostream>
33
34#include "base/hashmap.hh"
35#include "mem/protocol/GenericMachineType.hh"
36#include "mem/protocol/RubyRequestType.hh"
37#include "mem/protocol/SequencerRequestType.hh"
38#include "mem/ruby/common/Address.hh"
39#include "mem/ruby/system/CacheMemory.hh"
40#include "mem/ruby/system/RubyPort.hh"
41#include "params/RubySequencer.hh"
42
43class DataBlock;
44
45struct SequencerRequest
46{
47    PacketPtr pkt;
48    RubyRequestType m_type;
49    Cycles issue_time;
50
51    SequencerRequest(PacketPtr _pkt, RubyRequestType _m_type,
52                     Cycles _issue_time)
53        : pkt(_pkt), m_type(_m_type), issue_time(_issue_time)
54    {}
55};
56
57std::ostream& operator<<(std::ostream& out, const SequencerRequest& obj);
58
59class Sequencer : public RubyPort
60{
61  public:
62    typedef RubySequencerParams Params;
63    Sequencer(const Params *);
64    ~Sequencer();
65
66    // Public Methods
67    void wakeup(); // Used only for deadlock detection
68
69    void printProgress(std::ostream& out) const;
70
71    void writeCallback(const Address& address, DataBlock& data);
72
73    void writeCallback(const Address& address,
74                       GenericMachineType mach,
75                       DataBlock& data);
76
77    void writeCallback(const Address& address,
78                       GenericMachineType mach,
79                       DataBlock& data,
80                       Time initialRequestTime,
81                       Time forwardRequestTime,
82                       Time firstResponseTime);
83
84    void readCallback(const Address& address, DataBlock& data);
85
86    void readCallback(const Address& address,
87                      GenericMachineType mach,
88                      DataBlock& data);
89
90    void readCallback(const Address& address,
91                      GenericMachineType mach,
92                      DataBlock& data,
93                      Time initialRequestTime,
94                      Time forwardRequestTime,
95                      Time firstResponseTime);
96
97    RequestStatus makeRequest(PacketPtr pkt);
98    bool empty() const;
99    int outstandingCount() const { return m_outstanding_count; }
100    bool
101    isDeadlockEventScheduled() const
102    {
103        return deadlockCheckEvent.scheduled();
104    }
105
106    void
107    descheduleDeadlockEvent()
108    {
109        deschedule(deadlockCheckEvent);
110    }
111
112    void print(std::ostream& out) const;
113    void printStats(std::ostream& out) const;
114    void checkCoherence(const Address& address);
115
116    void markRemoved();
117    void removeRequest(SequencerRequest* request);
118    void evictionCallback(const Address& address);
119
120    void recordRequestType(SequencerRequestType requestType);
121
122  private:
123    void issueRequest(PacketPtr pkt, RubyRequestType type);
124
125    void hitCallback(SequencerRequest* request,
126                     GenericMachineType mach,
127                     DataBlock& data,
128                     bool success,
129                     Time initialRequestTime,
130                     Time forwardRequestTime,
131                     Time firstResponseTime);
132
133    RequestStatus insertRequest(PacketPtr pkt, RubyRequestType request_type);
134
135    bool handleLlsc(const Address& address, SequencerRequest* request);
136
137    // Private copy constructor and assignment operator
138    Sequencer(const Sequencer& obj);
139    Sequencer& operator=(const Sequencer& obj);
140
141  private:
142    int m_max_outstanding_requests;
143    Cycles m_deadlock_threshold;
144
145    CacheMemory* m_dataCache_ptr;
146    CacheMemory* m_instCache_ptr;
147
148    typedef m5::hash_map<Address, SequencerRequest*> RequestTable;
149    RequestTable m_writeRequestTable;
150    RequestTable m_readRequestTable;
151    // Global outstanding request count, across all request tables
152    int m_outstanding_count;
153    bool m_deadlock_check_scheduled;
154
155    int m_store_waiting_on_load_cycles;
156    int m_store_waiting_on_store_cycles;
157    int m_load_waiting_on_store_cycles;
158    int m_load_waiting_on_load_cycles;
159
160    bool m_usingNetworkTester;
161
162    class SequencerWakeupEvent : public Event
163    {
164      private:
165        Sequencer *m_sequencer_ptr;
166
167      public:
168        SequencerWakeupEvent(Sequencer *_seq) : m_sequencer_ptr(_seq) {}
169        void process() { m_sequencer_ptr->wakeup(); }
170        const char *description() const { return "Sequencer deadlock check"; }
171    };
172
173    SequencerWakeupEvent deadlockCheckEvent;
174};
175
176inline std::ostream&
177operator<<(std::ostream& out, const Sequencer& obj)
178{
179    obj.print(out);
180    out << std::flush;
181    return out;
182}
183
184#endif // __MEM_RUBY_SYSTEM_SEQUENCER_HH__
185