comm_monitor.hh revision 11173 
1/*
2 * Copyright (c) 2012-2013, 2015 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 "mem/mem_object.hh"
46#include "params/CommMonitor.hh"
47#include "sim/probe/mem.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: // Construction & SimObject interfaces
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    void init() override;
78    void regStats() override;
79    void startup() override;
80    void regProbePoints() override;
81
82  public: // MemObject interfaces
83    BaseMasterPort& getMasterPort(const std::string& if_name,
84                                  PortID idx = InvalidPortID) override;
85
86    BaseSlavePort& getSlavePort(const std::string& if_name,
87                                PortID idx = InvalidPortID) override;
88
89  private:
90
91    /**
92     * Sender state class for the monitor so that we can annotate
93     * packets with a transmit time and receive time.
94     */
95    class CommMonitorSenderState : public Packet::SenderState
96    {
97
98      public:
99
100        /**
101         * Construct a new sender state and store the time so we can
102         * calculate round-trip latency.
103         *
104         * @param _transmitTime Time of packet transmission
105         */
106        CommMonitorSenderState(Tick _transmitTime)
107            : transmitTime(_transmitTime)
108        { }
109
110        /** Destructor */
111        ~CommMonitorSenderState() { }
112
113        /** Tick when request is transmitted */
114        Tick transmitTime;
115
116    };
117
118    /**
119     * This is the master port of the communication monitor. All recv
120     * functions call a function in CommMonitor, where the
121     * send function of the slave port is called. Besides this, these
122     * functions can also perform actions for capturing statistics.
123     */
124    class MonitorMasterPort : public MasterPort
125    {
126
127      public:
128
129        MonitorMasterPort(const std::string& _name, CommMonitor& _mon)
130            : MasterPort(_name, &_mon), mon(_mon)
131        { }
132
133      protected:
134
135        void recvFunctionalSnoop(PacketPtr pkt)
136        {
137            mon.recvFunctionalSnoop(pkt);
138        }
139
140        Tick recvAtomicSnoop(PacketPtr pkt)
141        {
142            return mon.recvAtomicSnoop(pkt);
143        }
144
145        bool recvTimingResp(PacketPtr pkt)
146        {
147            return mon.recvTimingResp(pkt);
148        }
149
150        void recvTimingSnoopReq(PacketPtr pkt)
151        {
152            mon.recvTimingSnoopReq(pkt);
153        }
154
155        void recvRangeChange()
156        {
157            mon.recvRangeChange();
158        }
159
160        bool isSnooping() const
161        {
162            return mon.isSnooping();
163        }
164
165        void recvReqRetry()
166        {
167            mon.recvReqRetry();
168        }
169
170        void recvRetrySnoopResp()
171        {
172            mon.recvRetrySnoopResp();
173        }
174
175      private:
176
177        CommMonitor& mon;
178
179    };
180
181    /** Instance of master port, facing the memory side */
182    MonitorMasterPort masterPort;
183
184    /**
185     * This is the slave port of the communication monitor. All recv
186     * functions call a function in CommMonitor, where the
187     * send function of the master port is called. Besides this, these
188     * functions can also perform actions for capturing statistics.
189     */
190    class MonitorSlavePort : public SlavePort
191    {
192
193      public:
194
195        MonitorSlavePort(const std::string& _name, CommMonitor& _mon)
196            : SlavePort(_name, &_mon), mon(_mon)
197        { }
198
199      protected:
200
201        void recvFunctional(PacketPtr pkt)
202        {
203            mon.recvFunctional(pkt);
204        }
205
206        Tick recvAtomic(PacketPtr pkt)
207        {
208            return mon.recvAtomic(pkt);
209        }
210
211        bool recvTimingReq(PacketPtr pkt)
212        {
213            return mon.recvTimingReq(pkt);
214        }
215
216        bool recvTimingSnoopResp(PacketPtr pkt)
217        {
218            return mon.recvTimingSnoopResp(pkt);
219        }
220
221        AddrRangeList getAddrRanges() const
222        {
223            return mon.getAddrRanges();
224        }
225
226        void recvRespRetry()
227        {
228            mon.recvRespRetry();
229        }
230
231      private:
232
233        CommMonitor& mon;
234
235    };
236
237    /** Instance of slave port, i.e. on the CPU side */
238    MonitorSlavePort slavePort;
239
240    void recvFunctional(PacketPtr pkt);
241
242    void recvFunctionalSnoop(PacketPtr pkt);
243
244    Tick recvAtomic(PacketPtr pkt);
245
246    Tick recvAtomicSnoop(PacketPtr pkt);
247
248    bool recvTimingReq(PacketPtr pkt);
249
250    bool recvTimingResp(PacketPtr pkt);
251
252    void recvTimingSnoopReq(PacketPtr pkt);
253
254    bool recvTimingSnoopResp(PacketPtr pkt);
255
256    void recvRetrySnoopResp();
257
258    AddrRangeList getAddrRanges() const;
259
260    bool isSnooping() const;
261
262    void recvReqRetry();
263
264    void recvRespRetry();
265
266    void recvRangeChange();
267
268    /** Stats declarations, all in a struct for convenience. */
269    struct MonitorStats
270    {
271
272        /** Disable flag for burst length historgrams **/
273        bool disableBurstLengthHists;
274
275        /** Histogram of read burst lengths */
276        Stats::Histogram readBurstLengthHist;
277
278        /** Histogram of write burst lengths */
279        Stats::Histogram writeBurstLengthHist;
280
281        /** Disable flag for the bandwidth histograms */
282        bool disableBandwidthHists;
283
284        /**
285         * Histogram for read bandwidth per sample window. The
286         * internal counter is an unsigned int rather than a stat.
287         */
288        unsigned int readBytes;
289        Stats::Histogram readBandwidthHist;
290        Stats::Formula averageReadBW;
291        Stats::Scalar totalReadBytes;
292
293        /**
294         * Histogram for write bandwidth per sample window. The
295         * internal counter is an unsigned int rather than a stat.
296         */
297        unsigned int writtenBytes;
298        Stats::Histogram writeBandwidthHist;
299        Stats::Formula averageWriteBW;
300        Stats::Scalar totalWrittenBytes;
301
302        /** Disable flag for latency histograms. */
303        bool disableLatencyHists;
304
305        /** Histogram of read request-to-response latencies */
306        Stats::Histogram readLatencyHist;
307
308        /** Histogram of write request-to-response latencies */
309        Stats::Histogram writeLatencyHist;
310
311        /** Disable flag for ITT distributions. */
312        bool disableITTDists;
313
314        /**
315         * Inter transaction time (ITT) distributions. There are
316         * histograms of the time between two read, write or arbitrary
317         * accesses. The time of a request is the tick at which the
318         * request is forwarded by the monitor.
319         */
320        Stats::Distribution ittReadRead;
321        Stats::Distribution ittWriteWrite;
322        Stats::Distribution ittReqReq;
323        Tick timeOfLastRead;
324        Tick timeOfLastWrite;
325        Tick timeOfLastReq;
326
327        /** Disable flag for outstanding histograms. */
328        bool disableOutstandingHists;
329
330        /**
331         * Histogram of outstanding read requests. Counter for
332         * outstanding read requests is an unsigned integer because
333         * it should not be reset when stats are reset.
334         */
335        Stats::Histogram outstandingReadsHist;
336        unsigned int outstandingReadReqs;
337
338        /**
339         * Histogram of outstanding write requests. Counter for
340         * outstanding write requests is an unsigned integer because
341         * it should not be reset when stats are reset.
342         */
343        Stats::Histogram outstandingWritesHist;
344        unsigned int outstandingWriteReqs;
345
346        /** Disable flag for transaction histograms. */
347        bool disableTransactionHists;
348
349        /** Histogram of number of read transactions per time bin */
350        Stats::Histogram readTransHist;
351        unsigned int readTrans;
352
353        /** Histogram of number of timing write transactions per time bin */
354        Stats::Histogram writeTransHist;
355        unsigned int writeTrans;
356
357        /** Disable flag for address distributions. */
358        bool disableAddrDists;
359
360        /**
361         * Histogram of number of read accesses to addresses over
362         * time.
363         */
364        Stats::SparseHistogram readAddrDist;
365
366        /**
367         * Histogram of number of write accesses to addresses over
368         * time.
369         */
370        Stats::SparseHistogram writeAddrDist;
371
372        /**
373         * Create the monitor stats and initialise all the members
374         * that are not statistics themselves, but used to control the
375         * stats or track values during a sample period.
376         */
377        MonitorStats(const CommMonitorParams* params) :
378            disableBurstLengthHists(params->disable_burst_length_hists),
379            disableBandwidthHists(params->disable_bandwidth_hists),
380            readBytes(0), writtenBytes(0),
381            disableLatencyHists(params->disable_latency_hists),
382            disableITTDists(params->disable_itt_dists),
383            timeOfLastRead(0), timeOfLastWrite(0), timeOfLastReq(0),
384            disableOutstandingHists(params->disable_outstanding_hists),
385            outstandingReadReqs(0), outstandingWriteReqs(0),
386            disableTransactionHists(params->disable_transaction_hists),
387            readTrans(0), writeTrans(0),
388            disableAddrDists(params->disable_addr_dists)
389        { }
390
391    };
392
393    /** This function is called periodically at the end of each time bin */
394    void samplePeriodic();
395
396    /** Periodic event called at the end of each simulation time bin */
397    EventWrapper<CommMonitor, &CommMonitor::samplePeriodic> samplePeriodicEvent;
398
399    /**
400     *@{
401     * @name Configuration
402     */
403
404    /** Length of simulation time bin*/
405    const Tick samplePeriodTicks;
406    /** Sample period in seconds */
407    const double samplePeriod;
408
409    /** Address mask for sources of read accesses to be captured */
410    const Addr readAddrMask;
411
412    /** Address mask for sources of write accesses to be captured */
413    const Addr writeAddrMask;
414
415    /** @} */
416
417    /** Instantiate stats */
418    MonitorStats stats;
419
420  protected: // Probe points
421    /**
422     * @{
423     * @name Memory system probe points
424     */
425
426    /** Successfully forwarded request packet */
427    ProbePoints::PacketUPtr ppPktReq;
428
429    /** Successfully forwarded response packet */
430    ProbePoints::PacketUPtr ppPktResp;
431
432    /** @} */
433};
434
435#endif //__MEM_COMM_MONITOR_HH__
436