1/*
2 * Copyright (c) 2011-2015, 2017 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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103 CoherentXBarSlavePort(const std::string &_name,
104 CoherentXBar &_xbar, PortID _id)
105 : QueuedSlavePort(_name, &_xbar, queue, _id), xbar(_xbar),
106 queue(_xbar, *this)
107 { }
108
109 protected:
110
111 bool
112 recvTimingReq(PacketPtr pkt) override
113 {
114 return xbar.recvTimingReq(pkt, id);
115 }
116
117 bool
118 recvTimingSnoopResp(PacketPtr pkt) override
119 {
120 return xbar.recvTimingSnoopResp(pkt, id);
121 }
122
123 Tick
124 recvAtomic(PacketPtr pkt) override
125 {
126 return xbar.recvAtomic(pkt, id);
127 }
128
129 void
130 recvFunctional(PacketPtr pkt) override
131 {
132 xbar.recvFunctional(pkt, id);
133 }
134
135 AddrRangeList
136 getAddrRanges() const override
137 {
138 return xbar.getAddrRanges();
139 }
140
141 };
142
143 /**
144 * Declaration of the coherent crossbar master port type, one will be
145 * instantiated for each of the slave interfaces connecting to the
146 * crossbar.
147 */

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161 protected:
162
163 /**
164 * Determine if this port should be considered a snooper. For
165 * a coherent crossbar master port this is always true.
166 *
167 * @return a boolean that is true if this port is snooping
168 */
169 bool isSnooping() const override { return true; }
170
171 bool
172 recvTimingResp(PacketPtr pkt) override
173 {
174 return xbar.recvTimingResp(pkt, id);
175 }
176
177 void
178 recvTimingSnoopReq(PacketPtr pkt) override
179 {
180 return xbar.recvTimingSnoopReq(pkt, id);
181 }
182
183 Tick
184 recvAtomicSnoop(PacketPtr pkt) override
185 {
186 return xbar.recvAtomicSnoop(pkt, id);
187 }
188
189 void
190 recvFunctionalSnoop(PacketPtr pkt) override
191 {
192 xbar.recvFunctionalSnoop(pkt, id);
193 }
194
195 void recvRangeChange() override { xbar.recvRangeChange(id); }
196 void recvReqRetry() override { xbar.recvReqRetry(id); }
197
198 };
199
200 /**
201 * Internal class to bridge between an incoming snoop response
202 * from a slave port and forwarding it through an outgoing slave
203 * port. It is effectively a dangling master port.
204 */
205 class SnoopRespPort : public MasterPort

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218 SnoopRespPort(QueuedSlavePort& slave_port, CoherentXBar& _xbar) :
219 MasterPort(slave_port.name() + ".snoopRespPort", &_xbar),
220 slavePort(slave_port) { }
221
222 /**
223 * Override the sending of retries and pass them on through
224 * the mirrored slave port.
225 */
226 void
227 sendRetryResp() override
228 {
229 // forward it as a snoop response retry
230 slavePort.sendRetrySnoopResp();
231 }
232
233 void
234 recvReqRetry() override
235 {
236 panic("SnoopRespPort should never see retry");
237 }
238
239 bool
240 recvTimingResp(PacketPtr pkt) override
241 {
242 panic("SnoopRespPort should never see timing response");
243 }
244
245 };
246
247 std::vector<SnoopRespPort*> snoopRespPorts;
248
249 std::vector<QueuedSlavePort*> snoopPorts;
250

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267 * properties.
268 */
269 System *system;
270
271 /** A snoop filter that tracks cache line residency and can restrict the
272 * broadcast needed for probes. NULL denotes an absent filter. */
273 SnoopFilter *snoopFilter;
274
275 const Cycles snoopResponseLatency;
276 const bool pointOfCoherency;
277 const bool pointOfUnification;
278
279 /**
280 * Upstream caches need this packet until true is returned, so
281 * hold it for deletion until a subsequent call
282 */
283 std::unique_ptr<Packet> pendingDelete;
284
285 bool recvTimingReq(PacketPtr pkt, PortID slave_port_id);
286 bool recvTimingResp(PacketPtr pkt, PortID master_port_id);
287 void recvTimingSnoopReq(PacketPtr pkt, PortID master_port_id);
288 bool recvTimingSnoopResp(PacketPtr pkt, PortID slave_port_id);
289 void recvReqRetry(PortID master_port_id);
290
291 /**
292 * Forward a timing packet to our snoopers, potentially excluding
293 * one of the connected coherent masters to avoid sending a packet
294 * back to where it came from.
295 *
296 * @param pkt Packet to forward
297 * @param exclude_slave_port_id Id of slave port to exclude
298 */
299 void
300 forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id)
301 {
302 forwardTiming(pkt, exclude_slave_port_id, snoopPorts);
303 }
304
305 /**
306 * Forward a timing packet to a selected list of snoopers, potentially
307 * excluding one of the connected coherent masters to avoid sending a packet
308 * back to where it came from.
309 *
310 * @param pkt Packet to forward
311 * @param exclude_slave_port_id Id of slave port to exclude
312 * @param dests Vector of destination ports for the forwarded pkt
313 */
314 void forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id,
315 const std::vector<QueuedSlavePort*>& dests);
316
317 Tick recvAtomic(PacketPtr pkt, PortID slave_port_id);
318 Tick recvAtomicSnoop(PacketPtr pkt, PortID master_port_id);
319
320 /**
321 * Forward an atomic packet to our snoopers, potentially excluding
322 * one of the connected coherent masters to avoid sending a packet
323 * back to where it came from.
324 *
325 * @param pkt Packet to forward
326 * @param exclude_slave_port_id Id of slave port to exclude
327 *
328 * @return a pair containing the snoop response and snoop latency
329 */
330 std::pair
331 forwardAtomic(PacketPtr pkt, PortID exclude_slave_port_id)
332 {
333 return forwardAtomic(pkt, exclude_slave_port_id, InvalidPortID,
334 snoopPorts);
335 }
336
337 /**
338 * Forward an atomic packet to a selected list of snoopers, potentially
339 * excluding one of the connected coherent masters to avoid sending a packet

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388 * The memory below is the destination for a cache mainteance
389 * operation to the Point of Coherence/Unification if this is the
390 * Point of Coherence/Unification.
391 *
392 * @param pkt The processed packet
393 *
394 * @return Whether the memory below is the destination for the packet
395 */
396 bool
397 isDestination(const PacketPtr pkt) const
398 {
399 return (pkt->req->isToPOC() && pointOfCoherency) ||
400 (pkt->req->isToPOU() && pointOfUnification);
401 }
402
403 Stats::Scalar snoops;
404 Stats::Scalar snoopTraffic;
405 Stats::Distribution snoopFanout;

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