Sequencer.hh revision 9104:27d56b644e78 
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/common/Consumer.hh"
40#include "mem/ruby/system/RubyPort.hh"
41
42class DataBlock;
43class CacheMemory;
44
45struct RubySequencerParams;
46
47struct SequencerRequest
48{
49    PacketPtr pkt;
50    RubyRequestType m_type;
51    Time issue_time;
52
53    SequencerRequest(PacketPtr _pkt, RubyRequestType _m_type, Time _issue_time)
54        : pkt(_pkt), m_type(_m_type), issue_time(_issue_time)
55    {}
56};
57
58std::ostream& operator<<(std::ostream& out, const SequencerRequest& obj);
59
60class Sequencer : public RubyPort, public Consumer
61{
62  public:
63    typedef RubySequencerParams Params;
64    Sequencer(const Params *);
65    ~Sequencer();
66
67    // Public Methods
68    void wakeup(); // Used only for deadlock detection
69
70    void printConfig(std::ostream& out) const;
71
72    void printProgress(std::ostream& out) const;
73
74    void writeCallback(const Address& address, DataBlock& data);
75
76    void writeCallback(const Address& address,
77                       GenericMachineType mach,
78                       DataBlock& data);
79
80    void writeCallback(const Address& address,
81                       GenericMachineType mach,
82                       DataBlock& data,
83                       Time initialRequestTime,
84                       Time forwardRequestTime,
85                       Time firstResponseTime);
86
87    void readCallback(const Address& address, DataBlock& data);
88
89    void readCallback(const Address& address,
90                      GenericMachineType mach,
91                      DataBlock& data);
92
93    void readCallback(const Address& address,
94                      GenericMachineType mach,
95                      DataBlock& data,
96                      Time initialRequestTime,
97                      Time forwardRequestTime,
98                      Time firstResponseTime);
99
100    RequestStatus makeRequest(PacketPtr pkt);
101    bool empty() const;
102    int outstandingCount() const { return m_outstanding_count; }
103    bool
104    isDeadlockEventScheduled() const
105    {
106        return deadlockCheckEvent.scheduled();
107    }
108
109    void
110    descheduleDeadlockEvent()
111    {
112        deschedule(deadlockCheckEvent);
113    }
114
115    void print(std::ostream& out) const;
116    void printStats(std::ostream& out) const;
117    void checkCoherence(const Address& address);
118
119    void markRemoved();
120    void removeRequest(SequencerRequest* request);
121    void evictionCallback(const Address& address);
122
123    void recordRequestType(SequencerRequestType requestType);
124
125  private:
126    void issueRequest(PacketPtr pkt, RubyRequestType type);
127
128    void hitCallback(SequencerRequest* request,
129                     GenericMachineType mach,
130                     DataBlock& data,
131                     bool success,
132                     Time initialRequestTime,
133                     Time forwardRequestTime,
134                     Time firstResponseTime);
135
136    RequestStatus insertRequest(PacketPtr pkt, RubyRequestType request_type);
137
138    bool handleLlsc(const Address& address, SequencerRequest* request);
139
140    // Private copy constructor and assignment operator
141    Sequencer(const Sequencer& obj);
142    Sequencer& operator=(const Sequencer& obj);
143
144  private:
145    int m_max_outstanding_requests;
146    int m_deadlock_threshold;
147
148    CacheMemory* m_dataCache_ptr;
149    CacheMemory* m_instCache_ptr;
150
151    typedef m5::hash_map<Address, SequencerRequest*> RequestTable;
152    RequestTable m_writeRequestTable;
153    RequestTable m_readRequestTable;
154    // Global outstanding request count, across all request tables
155    int m_outstanding_count;
156    bool m_deadlock_check_scheduled;
157
158    int m_store_waiting_on_load_cycles;
159    int m_store_waiting_on_store_cycles;
160    int m_load_waiting_on_store_cycles;
161    int m_load_waiting_on_load_cycles;
162
163    bool m_usingNetworkTester;
164
165    class SequencerWakeupEvent : public Event
166    {
167      private:
168        Sequencer *m_sequencer_ptr;
169
170      public:
171        SequencerWakeupEvent(Sequencer *_seq) : m_sequencer_ptr(_seq) {}
172        void process() { m_sequencer_ptr->wakeup(); }
173        const char *description() const { return "Sequencer deadlock check"; }
174    };
175
176    SequencerWakeupEvent deadlockCheckEvent;
177};
178
179inline std::ostream&
180operator<<(std::ostream& out, const Sequencer& obj)
181{
182    obj.print(out);
183    out << std::flush;
184    return out;
185}
186
187#endif // __MEM_RUBY_SYSTEM_SEQUENCER_HH__
188