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38 #include "mem/mem_checker.hh"
43 MemChecker::WriteCluster::startWrite(MemChecker::Serial serial
, Tick _start
,
46 assert(!isComplete());
48 if (start
== TICK_FUTURE
) {
49 // Initialize a fresh write cluster
52 chatty_assert(start
<= _start
, "WriteClusters must filled in order!");
56 if (complete
!= TICK_FUTURE
) {
57 // Reopen a closed write cluster
58 assert(_start
< complete
); // should open a new write cluster, instead;
59 // also somewhat fishy wrt causality / ordering of calls vs time
60 // progression TODO: Check me!
61 complete
= TICK_FUTURE
;
64 // Create new transaction, and denote completion time to be in the future.
65 writes
.insert(std::make_pair(serial
,
66 MemChecker::Transaction(serial
, _start
, TICK_FUTURE
, data
)));
70 MemChecker::WriteCluster::completeWrite(MemChecker::Serial serial
, Tick _complete
)
72 auto it
= writes
.find(serial
);
74 if (it
== writes
.end()) {
75 warn("Could not locate write transaction: serial = %d, complete = %d\n",
80 // Record completion time of the write
81 assert(it
->second
.complete
== TICK_FUTURE
);
82 it
->second
.complete
= _complete
;
84 // Update max completion time for the cluster
85 if (completeMax
< _complete
) {
86 completeMax
= _complete
;
89 if (--numIncomplete
== 0) {
90 // All writes have completed, this cluster is now complete and will be
91 // assigned the max of completion tick values among all writes.
93 // Note that we cannot simply keep updating complete, because that would
94 // count the cluster as closed already. Instead, we keep TICK_FUTURE
95 // until all writes have completed.
96 complete
= completeMax
;
101 MemChecker::WriteCluster::abortWrite(MemChecker::Serial serial
)
103 if (!writes
.erase(serial
)) {
104 warn("Could not locate write transaction: serial = %d\n", serial
);
108 if (--numIncomplete
== 0 && !writes
.empty()) {
109 // This write cluster is now complete, and we can assign the current
110 // completeMax value.
111 complete
= completeMax
;
114 // Note: this WriteCluster is in pristine state if this was the only
115 // write present; the cluster will get reused through
116 // getIncompleteWriteCluster().
120 MemChecker::ByteTracker::startRead(MemChecker::Serial serial
, Tick start
)
122 outstandingReads
.insert(std::make_pair(serial
,
123 MemChecker::Transaction(serial
, start
, TICK_FUTURE
)));
127 MemChecker::ByteTracker::inExpectedData(Tick start
, Tick complete
, uint8_t data
)
129 _lastExpectedData
.clear();
131 bool wc_overlap
= true;
133 // Find the last value read from the location
134 const Transaction
& last_obs
=
135 *lastCompletedTransaction(&readObservations
, start
);
136 bool last_obs_valid
= (last_obs
.complete
!= TICK_INITIAL
);
138 // Scan backwards through the write clusters to find the closest younger
139 // preceding & overlapping writes.
140 for (auto cluster
= writeClusters
.rbegin();
141 cluster
!= writeClusters
.rend() && wc_overlap
; ++cluster
) {
142 for (const auto& addr_write
: cluster
->writes
) {
143 const Transaction
& write
= addr_write
.second
;
145 if (write
.complete
< last_obs
.start
) {
146 // If this write transaction completed before the last
147 // observation, we ignore it as the last_observation has the
152 if (write
.data
== data
) {
153 // Found a match, end search.
157 // Record possible, but non-matching data for debugging
158 _lastExpectedData
.push_back(write
.data
);
160 if (write
.complete
> start
) {
161 // This write overlapped with the transaction we want to check
162 // -> continue checking the overlapping write cluster
166 // This write cluster has writes that have completed before the
167 // checked transaction. There is no need to check an earlier
168 // write-cluster -> set the exit condition for the outer loop
171 if (last_obs
.complete
< write
.start
) {
172 // We found a write which started after the last observed read,
173 // therefore we can not longer consider the value seen by the
174 // last observation as a valid expected value.
176 // Once all writes have been iterated through, we can check if
177 // the last observation is still valid to compare against.
178 last_obs_valid
= false;
183 // We have not found any matching write, so far; check other sources of
185 if (last_obs_valid
) {
186 // The last observation is not outdated according to the writes we have
188 assert(last_obs
.complete
<= start
);
189 if (last_obs
.data
== data
) {
190 // Matched data from last observation -> all good
193 // Record non-matching, but possible value
194 _lastExpectedData
.push_back(last_obs
.data
);
196 // We have not seen any valid observation, and the only writes
197 // observed are overlapping, so anything (in particular the
198 // initialisation value) goes
199 // NOTE: We can overlap with multiple write clusters, here
200 if (!writeClusters
.empty() && wc_overlap
) {
201 // ensure that all write clusters really overlap this read
202 assert(writeClusters
.begin()->start
< complete
&&
203 writeClusters
.rbegin()->complete
> start
);
208 if (_lastExpectedData
.empty()) {
209 assert(last_obs
.complete
== TICK_INITIAL
);
210 // We have not found any possible (non-matching data). Can happen in
211 // initial system state
212 DPRINTF(MemChecker
, "no last observation nor write! start = %d, "\
213 "complete = %d, data = %#x\n", start
, complete
, data
);
220 MemChecker::ByteTracker::completeRead(MemChecker::Serial serial
,
221 Tick complete
, uint8_t data
)
223 auto it
= outstandingReads
.find(serial
);
225 if (it
== outstandingReads
.end()) {
226 // Can happen if concurrent with reset_address_range
227 warn("Could not locate read transaction: serial = %d, complete = %d\n",
232 Tick start
= it
->second
.start
;
233 outstandingReads
.erase(it
);
236 const bool result
= inExpectedData(start
, complete
, data
);
238 readObservations
.emplace_back(serial
, start
, complete
, data
);
244 MemChecker::WriteCluster
*
245 MemChecker::ByteTracker::getIncompleteWriteCluster()
247 if (writeClusters
.empty() || writeClusters
.back().isComplete()) {
248 writeClusters
.emplace_back();
251 return &writeClusters
.back();
255 MemChecker::ByteTracker::startWrite(MemChecker::Serial serial
, Tick start
,
258 getIncompleteWriteCluster()->startWrite(serial
, start
, data
);
262 MemChecker::ByteTracker::completeWrite(MemChecker::Serial serial
, Tick complete
)
264 getIncompleteWriteCluster()->completeWrite(serial
, complete
);
269 MemChecker::ByteTracker::abortWrite(MemChecker::Serial serial
)
271 getIncompleteWriteCluster()->abortWrite(serial
);
275 MemChecker::ByteTracker::pruneTransactions()
277 // Obtain tick of first outstanding read. If there are no outstanding
278 // reads, we use curTick(), i.e. we will remove all readObservation except
279 // the most recent one.
280 const Tick before
= outstandingReads
.empty() ? curTick() :
281 outstandingReads
.begin()->second
.start
;
283 // Pruning of readObservations
284 readObservations
.erase(readObservations
.begin(),
285 lastCompletedTransaction(&readObservations
, before
));
287 // Pruning of writeClusters
288 if (!writeClusters
.empty()) {
289 writeClusters
.erase(writeClusters
.begin(),
290 lastCompletedTransaction(&writeClusters
, before
));
295 MemChecker::completeRead(MemChecker::Serial serial
, Tick complete
,
296 Addr addr
, size_t size
, uint8_t *data
)
301 "completing read: serial = %d, complete = %d, "
302 "addr = %#llx, size = %d\n", serial
, complete
, addr
, size
);
304 for (size_t i
= 0; i
< size
; ++i
) {
305 ByteTracker
*tracker
= getByteTracker(addr
+ i
);
307 if (!tracker
->completeRead(serial
, complete
, data
[i
])) {
308 // Generate error message, and aggregate all failures for the bytes
309 // considered in this transaction in one message.
314 errorMessage
+= "\n";
317 errorMessage
+= csprintf(" Read transaction for address %#llx "
318 "failed: received %#x, expected ",
319 (unsigned long long)(addr
+ i
), data
[i
]);
321 for (size_t j
= 0; j
< tracker
->lastExpectedData().size(); ++j
) {
324 tracker
->lastExpectedData()[j
],
325 (j
== tracker
->lastExpectedData().size() - 1)
332 DPRINTF(MemChecker
, "read of %#llx @ cycle %d failed:\n%s\n", addr
,
333 complete
, errorMessage
);
340 MemChecker::reset(Addr addr
, size_t size
)
342 for (size_t i
= 0; i
< size
; ++i
) {
343 byte_trackers
.erase(addr
+ i
);