comm_monitor.hh revision 8981:6f4ec692716f 
1/*
2 * Copyright (c) 2012 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 */
40
41#ifndef __MEM_COMM_MONITOR_HH__
42#define __MEM_COMM_MONITOR_HH__
43
44#include "base/statistics.hh"
45#include "base/time.hh"
46#include "mem/mem_object.hh"
47#include "params/CommMonitor.hh"
48
49/**
50 * The communication monitor is a MemObject which can monitor statistics of
51 * the communication happening between two ports in the memory system.
52 *
53 * Currently the following stats are implemented: Histograms of read/write
54 * transactions, read/write burst lengths, read/write bandwidth,
55 * outstanding read/write requests, read latency and inter transaction time
56 * (read-read, write-write, read/write-read/write). Furthermore it allows
57 * to capture the number of accesses to an address over time ("heat map").
58 * All stats can be disabled from Python.
59 */
60class CommMonitor : public MemObject
61{
62
63  public:
64
65    /** Parameters of communication monitor */
66    typedef CommMonitorParams Params;
67    const Params* params() const
68    { return reinterpret_cast<const Params*>(_params); }
69
70    /**
71     * Constructor based on the Python params
72     *
73     * @param params Python parameters
74     */
75    CommMonitor(Params* params);
76
77    /** Destructor */
78    ~CommMonitor() { }
79
80    virtual MasterPort& getMasterPort(const std::string& if_name,
81                                      int idx = -1);
82
83    virtual SlavePort& getSlavePort(const std::string& if_name,
84                                    int idx = -1);
85
86    virtual void init();
87
88    /** Register statistics */
89    void regStats();
90
91  private:
92
93    /**
94     * Sender state class for the monitor so that we can annotate
95     * packets with a transmit time and receive time.
96     */
97    class CommMonitorSenderState : public Packet::SenderState
98    {
99
100      public:
101
102        /**
103         * Construct a new sender state and remember the original one
104         * so that we can implement a stack.
105         *
106         * @param _origSenderState Sender state to remember
107         * @param _transmitTime Time of packet transmission
108         */
109        CommMonitorSenderState(SenderState* _origSenderState,
110                               Tick _transmitTime)
111            : origSenderState(_origSenderState), transmitTime(_transmitTime)
112        { }
113
114        /** Destructor */
115        ~CommMonitorSenderState() { }
116
117        /** Pointer to old sender state of packet */
118        SenderState* origSenderState;
119
120        /** Tick when request is transmitted */
121        Tick transmitTime;
122
123    };
124
125    /**
126     * This is the master port of the communication monitor. All recv
127     * functions call a function in CommMonitor, where the
128     * send function of the slave port is called. Besides this, these
129     * functions can also perform actions for capturing statistics.
130     */
131    class MonitorMasterPort : public MasterPort
132    {
133
134      public:
135
136        MonitorMasterPort(const std::string& _name, CommMonitor& _mon)
137            : MasterPort(_name, &_mon), mon(_mon)
138        { }
139
140      protected:
141
142        void recvFunctionalSnoop(PacketPtr pkt)
143        {
144            mon.recvFunctionalSnoop(pkt);
145        }
146
147        Tick recvAtomicSnoop(PacketPtr pkt)
148        {
149            return mon.recvAtomicSnoop(pkt);
150        }
151
152        bool recvTimingResp(PacketPtr pkt)
153        {
154            return mon.recvTimingResp(pkt);
155        }
156
157        void recvTimingSnoopReq(PacketPtr pkt)
158        {
159            mon.recvTimingSnoopReq(pkt);
160        }
161
162        void recvRangeChange()
163        {
164            mon.recvRangeChange();
165        }
166
167        bool isSnooping() const
168        {
169            return mon.isSnooping();
170        }
171
172        unsigned deviceBlockSize() const
173        {
174            return mon.deviceBlockSizeMaster();
175        }
176
177        void recvRetry()
178        {
179            mon.recvRetryMaster();
180        }
181
182      private:
183
184        CommMonitor& mon;
185
186    };
187
188    /** Instance of master port, facing the memory side */
189    MonitorMasterPort masterPort;
190
191    /**
192     * This is the slave port of the communication monitor. All recv
193     * functions call a function in CommMonitor, where the
194     * send function of the master port is called. Besides this, these
195     * functions can also perform actions for capturing statistics.
196     */
197    class MonitorSlavePort : public SlavePort
198    {
199
200      public:
201
202        MonitorSlavePort(const std::string& _name, CommMonitor& _mon)
203            : SlavePort(_name, &_mon), mon(_mon)
204        { }
205
206      protected:
207
208        void recvFunctional(PacketPtr pkt)
209        {
210            mon.recvFunctional(pkt);
211        }
212
213        Tick recvAtomic(PacketPtr pkt)
214        {
215            return mon.recvAtomic(pkt);
216        }
217
218        bool recvTimingReq(PacketPtr pkt)
219        {
220            return mon.recvTimingReq(pkt);
221        }
222
223        bool recvTimingSnoopResp(PacketPtr pkt)
224        {
225            return mon.recvTimingSnoopResp(pkt);
226        }
227
228        unsigned deviceBlockSize() const
229        {
230            return mon.deviceBlockSizeSlave();
231        }
232
233        AddrRangeList getAddrRanges()
234        {
235            return mon.getAddrRanges();
236        }
237
238        void recvRetry()
239        {
240            mon.recvRetrySlave();
241        }
242
243      private:
244
245        CommMonitor& mon;
246
247    };
248
249    /** Instance of slave port, i.e. on the CPU side */
250    MonitorSlavePort slavePort;
251
252    void recvFunctional(PacketPtr pkt);
253
254    void recvFunctionalSnoop(PacketPtr pkt);
255
256    Tick recvAtomic(PacketPtr pkt);
257
258    Tick recvAtomicSnoop(PacketPtr pkt);
259
260    bool recvTimingReq(PacketPtr pkt);
261
262    bool recvTimingResp(PacketPtr pkt);
263
264    void recvTimingSnoopReq(PacketPtr pkt);
265
266    bool recvTimingSnoopResp(PacketPtr pkt);
267
268    unsigned deviceBlockSizeMaster();
269
270    unsigned deviceBlockSizeSlave();
271
272    AddrRangeList getAddrRanges();
273
274    bool isSnooping() const;
275
276    void recvRetryMaster();
277
278    void recvRetrySlave();
279
280    void recvRangeChange();
281
282    void periodicTraceDump();
283
284    /** Stats declarations, all in a struct for convenience. */
285    struct MonitorStats
286    {
287
288        /** Disable flag for burst length historgrams **/
289        bool disableBurstLengthHists;
290
291        /** Histogram of read burst lengths */
292        Stats::Histogram readBurstLengthHist;
293
294        /** Histogram of write burst lengths */
295        Stats::Histogram writeBurstLengthHist;
296
297        /** Disable flag for the bandwidth histograms */
298        bool disableBandwidthHists;
299
300        /**
301         * Histogram for read bandwidth per sample window. The
302         * internal counter is an unsigned int rather than a stat.
303         */
304        unsigned int readBytes;
305        Stats::Histogram readBandwidthHist;
306        Stats::Formula averageReadBW;
307        Stats::Scalar totalReadBytes;
308
309        /**
310         * Histogram for write bandwidth per sample window. The
311         * internal counter is an unsigned int rather than a stat.
312         */
313        unsigned int writtenBytes;
314        Stats::Histogram writeBandwidthHist;
315        Stats::Formula averageWriteBW;
316        Stats::Scalar totalWrittenBytes;
317
318        /** Disable flag for latency histograms. */
319        bool disableLatencyHists;
320
321        /** Histogram of read request-to-response latencies */
322        Stats::Histogram readLatencyHist;
323
324        /** Histogram of write request-to-response latencies */
325        Stats::Histogram writeLatencyHist;
326
327        /** Disable flag for ITT distributions. */
328        bool disableITTDists;
329
330        /**
331         * Inter transaction time (ITT) distributions. There are
332         * histograms of the time between two read, write or arbitrary
333         * accesses. The time of a request is the tick at which the
334         * request is forwarded by the monitor.
335         */
336        Stats::Distribution ittReadRead;
337        Stats::Distribution ittWriteWrite;
338        Stats::Distribution ittReqReq;
339        Tick timeOfLastRead;
340        Tick timeOfLastWrite;
341        Tick timeOfLastReq;
342
343        /** Disable flag for outstanding histograms. */
344        bool disableOutstandingHists;
345
346        /**
347         * Histogram of outstanding read requests. Counter for
348         * outstanding read requests is an unsigned integer because
349         * it should not be reset when stats are reset.
350         */
351        Stats::Histogram outstandingReadsHist;
352        unsigned int outstandingReadReqs;
353
354        /**
355         * Histogram of outstanding write requests. Counter for
356         * outstanding write requests is an unsigned integer because
357         * it should not be reset when stats are reset.
358         */
359        Stats::Histogram outstandingWritesHist;
360        unsigned int outstandingWriteReqs;
361
362        /** Disable flag for transaction histograms. */
363        bool disableTransactionHists;
364
365        /** Histogram of number of read transactions per time bin */
366        Stats::Histogram readTransHist;
367        unsigned int readTrans;
368
369        /** Histogram of number of timing write transactions per time bin */
370        Stats::Histogram writeTransHist;
371        unsigned int writeTrans;
372
373        /** Disable flag for address distributions. */
374        bool disableAddrDists;
375
376        /**
377         * Histogram of number of read accesses to addresses over
378         * time.
379         */
380        Stats::SparseHistogram readAddrDist;
381
382        /**
383         * Histogram of number of write accesses to addresses over
384         * time.
385         */
386        Stats::SparseHistogram writeAddrDist;
387
388        /**
389         * Create the monitor stats and initialise all the members
390         * that are not statistics themselves, but used to control the
391         * stats or track values during a sample period.
392         */
393        MonitorStats(const CommMonitorParams* params) :
394            disableBurstLengthHists(params->disable_burst_length_hists),
395            disableBandwidthHists(params->disable_bandwidth_hists),
396            readBytes(0), writtenBytes(0),
397            disableLatencyHists(params->disable_latency_hists),
398            disableITTDists(params->disable_itt_dists),
399            timeOfLastRead(0), timeOfLastWrite(0), timeOfLastReq(0),
400            disableOutstandingHists(params->disable_outstanding_hists),
401            outstandingReadReqs(0), outstandingWriteReqs(0),
402            disableTransactionHists(params->disable_transaction_hists),
403            readTrans(0), writeTrans(0),
404            disableAddrDists(params->disable_addr_dists)
405        { }
406
407    };
408
409    /** This function is called periodically at the end of each time bin */
410    void samplePeriodic();
411
412    /** Schedule the first periodic event */
413    void startup();
414
415    /** Periodic event called at the end of each simulation time bin */
416    EventWrapper<CommMonitor, &CommMonitor::samplePeriodic> samplePeriodicEvent;
417
418    /** Length of simulation time bin*/
419    Tick samplePeriodTicks;
420    Time samplePeriod;
421
422    /** Address mask for sources of read accesses to be captured */
423    Addr readAddrMask;
424
425    /** Address mask for sources of write accesses to be captured */
426    Addr writeAddrMask;
427
428    /** Instantiate stats */
429    MonitorStats stats;
430};
431
432#endif //__MEM_COMM_MONITOR_HH__
433