snoop_filter.cc (14122:11979370f6f8) snoop_filter.cc (14123:3525a51d01ef)
1/*
2 * Copyright (c) 2013-2017,2019 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

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201 // If the snoop filter has no entry, simply return a NULL
202 // portlist, there is no point creating an entry only to remove it
203 // later
204 if (!is_hit)
205 return snoopDown(lookupLatency);
206
207 SnoopItem& sf_item = sf_it->second;
208
1/*
2 * Copyright (c) 2013-2017,2019 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

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201 // If the snoop filter has no entry, simply return a NULL
202 // portlist, there is no point creating an entry only to remove it
203 // later
204 if (!is_hit)
205 return snoopDown(lookupLatency);
206
207 SnoopItem& sf_item = sf_it->second;
208
209 DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n",
210 __func__, sf_item.requested, sf_item.holder);
211
212 SnoopMask interested = (sf_item.holder | sf_item.requested);
213
214 totSnoops++;
215
216 if (interested.count() == 1)
217 hitSingleSnoops++;
218 else
219 hitMultiSnoops++;

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227 // caches down to the specified point of reference.
228 assert(cpkt->isWriteback() || cpkt->req->isUncacheable() ||
229 (cpkt->isInvalidate() == cpkt->needsWritable()) ||
230 cpkt->req->isCacheMaintenance());
231 if (cpkt->isInvalidate() && sf_item.requested.none()) {
232 // Early clear of the holder, if no other request is currently going on
233 // @todo: This should possibly be updated even though we do not filter
234 // upward snoops
209 SnoopMask interested = (sf_item.holder | sf_item.requested);
210
211 totSnoops++;
212
213 if (interested.count() == 1)
214 hitSingleSnoops++;
215 else
216 hitMultiSnoops++;

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224 // caches down to the specified point of reference.
225 assert(cpkt->isWriteback() || cpkt->req->isUncacheable() ||
226 (cpkt->isInvalidate() == cpkt->needsWritable()) ||
227 cpkt->req->isCacheMaintenance());
228 if (cpkt->isInvalidate() && sf_item.requested.none()) {
229 // Early clear of the holder, if no other request is currently going on
230 // @todo: This should possibly be updated even though we do not filter
231 // upward snoops
232 DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n",
233 __func__, sf_item.requested, sf_item.holder);
235 sf_item.holder = 0;
234 sf_item.holder = 0;
235 DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n",
236 __func__, sf_item.requested, sf_item.holder);
237 eraseIfNullEntry(sf_it);
236 }
237
238 }
239
238 eraseIfNullEntry(sf_it);
239 DPRINTF(SnoopFilter, "%s: new SF value %x.%x interest: %x \n",
240 __func__, sf_item.requested, sf_item.holder, interested);
241
242 return snoopSelected(maskToPortList(interested), lookupLatency);
243}
244
245void
246SnoopFilter::updateSnoopResponse(const Packet* cpkt,
247 const SlavePort& rsp_port,
248 const SlavePort& req_port)
249{

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315 }
316 auto sf_it = cachedLocations.find(line_addr);
317 bool is_hit = sf_it != cachedLocations.end();
318
319 // Nothing to do if it is not a hit
320 if (!is_hit)
321 return;
322
240 return snoopSelected(maskToPortList(interested), lookupLatency);
241}
242
243void
244SnoopFilter::updateSnoopResponse(const Packet* cpkt,
245 const SlavePort& rsp_port,
246 const SlavePort& req_port)
247{

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313 }
314 auto sf_it = cachedLocations.find(line_addr);
315 bool is_hit = sf_it != cachedLocations.end();
316
317 // Nothing to do if it is not a hit
318 if (!is_hit)
319 return;
320
323 SnoopItem& sf_item = sf_it->second;
324
325 DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n",
326 __func__, sf_item.requested, sf_item.holder);
327
328 // If the snoop response has no sharers the line is passed in
329 // Modified state, and we know that there are no other copies, or
330 // they will all be invalidated imminently
331 if (!cpkt->hasSharers()) {
321 // If the snoop response has no sharers the line is passed in
322 // Modified state, and we know that there are no other copies, or
323 // they will all be invalidated imminently
324 if (!cpkt->hasSharers()) {
325 SnoopItem& sf_item = sf_it->second;
326
327 DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n",
328 __func__, sf_item.requested, sf_item.holder);
332 sf_item.holder = 0;
329 sf_item.holder = 0;
333 }
334 DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n",
335 __func__, sf_item.requested, sf_item.holder);
336 eraseIfNullEntry(sf_it);
330 DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n",
331 __func__, sf_item.requested, sf_item.holder);
337
332
333 eraseIfNullEntry(sf_it);
334 }
338}
339
340void
341SnoopFilter::updateResponse(const Packet* cpkt, const SlavePort& slave_port)
342{
343 DPRINTF(SnoopFilter, "%s: src %s packet %s\n",
344 __func__, slave_port.name(), cpkt->print());
345

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336
337void
338SnoopFilter::updateResponse(const Packet* cpkt, const SlavePort& slave_port)
339{
340 DPRINTF(SnoopFilter, "%s: src %s packet %s\n",
341 __func__, slave_port.name(), cpkt->print());
342

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