1/*
2 * Copyright (c) 2012-2013, 2015 ARM Limited
3 * Copyright (c) 2016 Google Inc.
4 * All rights reserved.
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder. You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,

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32 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 *
38 * Authors: Thomas Grass
39 * Andreas Hansson
40 * Rahul Thakur
41 */
42
43#include "mem/comm_monitor.hh"
44
45#include "base/trace.hh"
46#include "debug/CommMonitor.hh"
47#include "sim/stats.hh"
48
49CommMonitor::CommMonitor(Params* params)
50 : MemObject(params),
51 masterPort(name() + "-master", *this),
52 slavePort(name() + "-slave", *this),
53 samplePeriodicEvent(this),
54 samplePeriodTicks(params->sample_period),
55 samplePeriod(params->sample_period / SimClock::Float::s),
56 stats(params)
57{
58 DPRINTF(CommMonitor,
59 "Created monitor %s with sample period %d ticks (%f ms)\n",
60 name(), samplePeriodTicks, samplePeriod * 1E3);
61}
62
63CommMonitor*

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108}
109
110void
111CommMonitor::recvFunctionalSnoop(PacketPtr pkt)
112{
113 slavePort.sendFunctionalSnoop(pkt);
114}
115
116void
117CommMonitor::MonitorStats::updateReqStats(
118 const ProbePoints::PacketInfo& pkt_info, bool is_atomic,
119 bool expects_response)
120{
121 if (pkt_info.cmd.isRead()) {
122 // Increment number of observed read transactions
123 if (!disableTransactionHists)
124 ++readTrans;
125
126 // Get sample of burst length
127 if (!disableBurstLengthHists)
128 readBurstLengthHist.sample(pkt_info.size);
129
130 // Sample the masked address
131 if (!disableAddrDists)
132 readAddrDist.sample(pkt_info.addr & readAddrMask);
133
134 if (!disableITTDists) {
135 // Sample value of read-read inter transaction time
136 if (timeOfLastRead != 0)
137 ittReadRead.sample(curTick() - timeOfLastRead);
138 timeOfLastRead = curTick();
139
140 // Sample value of req-req inter transaction time
141 if (timeOfLastReq != 0)
142 ittReqReq.sample(curTick() - timeOfLastReq);
143 timeOfLastReq = curTick();
144 }
145 if (!is_atomic && !disableOutstandingHists && expects_response)
146 ++outstandingReadReqs;
147
148 } else if (pkt_info.cmd.isWrite()) {
149 // Same as for reads
150 if (!disableTransactionHists)
151 ++writeTrans;
152
153 if (!disableBurstLengthHists)
154 writeBurstLengthHist.sample(pkt_info.size);
155
156 // Update the bandwidth stats on the request
157 if (!disableBandwidthHists) {
158 writtenBytes += pkt_info.size;
159 totalWrittenBytes += pkt_info.size;
160 }
161
162 // Sample the masked write address
163 if (!disableAddrDists)
164 writeAddrDist.sample(pkt_info.addr & writeAddrMask);
165
166 if (!disableITTDists) {
167 // Sample value of write-to-write inter transaction time
168 if (timeOfLastWrite != 0)
169 ittWriteWrite.sample(curTick() - timeOfLastWrite);
170 timeOfLastWrite = curTick();
171
172 // Sample value of req-to-req inter transaction time
173 if (timeOfLastReq != 0)
174 ittReqReq.sample(curTick() - timeOfLastReq);
175 timeOfLastReq = curTick();
176 }
177
178 if (!is_atomic && !disableOutstandingHists && expects_response)
179 ++outstandingWriteReqs;
180 }
181}
182
183void
184CommMonitor::MonitorStats::updateRespStats(
185 const ProbePoints::PacketInfo& pkt_info, Tick latency, bool is_atomic)
186{
187 if (pkt_info.cmd.isRead()) {
188 // Decrement number of outstanding read requests
189 if (!is_atomic && !disableOutstandingHists) {
190 assert(outstandingReadReqs != 0);
191 --outstandingReadReqs;
192 }
193
194 if (!disableLatencyHists)
195 readLatencyHist.sample(latency);
196
197 // Update the bandwidth stats based on responses for reads
198 if (!disableBandwidthHists) {
199 readBytes += pkt_info.size;
200 totalReadBytes += pkt_info.size;
201 }
202
203 } else if (pkt_info.cmd.isWrite()) {
204 // Decrement number of outstanding write requests
205 if (!is_atomic && !disableOutstandingHists) {
206 assert(outstandingWriteReqs != 0);
207 --outstandingWriteReqs;
208 }
209
210 if (!disableLatencyHists)
211 writeLatencyHist.sample(latency);
212 }
213}
214
215Tick
216CommMonitor::recvAtomic(PacketPtr pkt)
217{
218 const bool expects_response(pkt->needsResponse() &&
219 !pkt->cacheResponding());
220 ProbePoints::PacketInfo req_pkt_info(pkt);
221 ppPktReq->notify(req_pkt_info);
222
223 const Tick delay(masterPort.sendAtomic(pkt));
224
225 stats.updateReqStats(req_pkt_info, true, expects_response);
226 if (expects_response)
227 stats.updateRespStats(req_pkt_info, delay, true);
228
229 assert(pkt->isResponse());
230 ProbePoints::PacketInfo resp_pkt_info(pkt);
231 ppPktResp->notify(resp_pkt_info);
232 return delay;
233}
234
235Tick
236CommMonitor::recvAtomicSnoop(PacketPtr pkt)

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245 assert(pkt->isRequest());
246
247 // Store relevant fields of packet, because packet may be modified
248 // or even deleted when sendTiming() is called.
249 const ProbePoints::PacketInfo pkt_info(pkt);
250
251 const bool is_read = pkt->isRead();
252 const bool is_write = pkt->isWrite();
253 const bool expects_response(pkt->needsResponse() &&
254 !pkt->cacheResponding());
255
256 // If a cache miss is served by a cache, a monitor near the memory
257 // would see a request which needs a response, but this response
258 // would not come back from the memory. Therefore we additionally
259 // have to check the cacheResponding flag
260 if (expects_response && !stats.disableLatencyHists) {
261 pkt->pushSenderState(new CommMonitorSenderState(curTick()));
262 }

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268 if (!successful && expects_response && !stats.disableLatencyHists) {
269 delete pkt->popSenderState();
270 }
271
272 if (successful) {
273 ppPktReq->notify(pkt_info);
274 }
275
276 if (successful) {
277 DPRINTF(CommMonitor, "Forwarded %s request\n",
278 (is_read ? "read" : (is_write ? "write" : "non read/write")));
279 stats.updateReqStats(pkt_info, false, expects_response);
280 }
281 return successful;
282}
283
284bool
285CommMonitor::recvTimingResp(PacketPtr pkt)
286{
287 // should always see responses
288 assert(pkt->isResponse());

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320 // Don't delete anything and let the packet look like we
321 // did not touch it
322 pkt->senderState = received_state;
323 }
324 }
325
326 if (successful) {
327 ppPktResp->notify(pkt_info);
328 DPRINTF(CommMonitor, "Received %s response\n",
329 (is_read ? "Read" : (is_write ? "Write" : "non read/write")));
330 stats.updateRespStats(pkt_info, latency, false);
331 }
332 return successful;
333}
334
335void
336CommMonitor::recvTimingSnoopReq(PacketPtr pkt)
337{
338 slavePort.sendTimingSnoopReq(pkt);
339}

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