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 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 * Copyright (c) 2002-2005 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ron Dreslinski 41 * Ali Saidi 42 * Andreas Hansson 43 * William Wang 44 */ 45 46/** 47 * @file 48 * Declaration of a coherent crossbar. 49 */ 50 51#ifndef __MEM_COHERENT_XBAR_HH__ 52#define __MEM_COHERENT_XBAR_HH__ 53 54#include <unordered_map> 55#include <unordered_set> 56 57#include "mem/snoop_filter.hh" 58#include "mem/xbar.hh" 59#include "params/CoherentXBar.hh" 60 61/** 62 * A coherent crossbar connects a number of (potentially) snooping 63 * masters and slaves, and routes the request and response packets 64 * based on the address, and also forwards all requests to the 65 * snoopers and deals with the snoop responses. 66 * 67 * The coherent crossbar can be used as a template for modelling QPI, 68 * HyperTransport, ACE and coherent OCP buses, and is typically used 69 * for the L1-to-L2 buses and as the main system interconnect. @sa 70 * \ref gem5MemorySystem "gem5 Memory System" 71 */ 72class CoherentXBar : public BaseXBar 73{ 74 75 protected: 76 77 /** 78 * Declare the layers of this crossbar, one vector for requests, 79 * one for responses, and one for snoop responses 80 */ 81 std::vector<ReqLayer*> reqLayers; 82 std::vector<RespLayer*> respLayers; 83 std::vector<SnoopRespLayer*> snoopLayers; 84 85 /** 86 * Declaration of the coherent crossbar slave port type, one will 87 * be instantiated for each of the master ports connecting to the 88 * crossbar. 89 */ 90 class CoherentXBarSlavePort : public QueuedSlavePort 91 { 92 93 private: 94 95 /** A reference to the crossbar to which this port belongs. */ 96 CoherentXBar &xbar; 97 98 /** A normal packet queue used to store responses. */ 99 RespPacketQueue queue; 100 101 public: 102 103 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
| 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 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 * Copyright (c) 2002-2005 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ron Dreslinski 41 * Ali Saidi 42 * Andreas Hansson 43 * William Wang 44 */ 45 46/** 47 * @file 48 * Declaration of a coherent crossbar. 49 */ 50 51#ifndef __MEM_COHERENT_XBAR_HH__ 52#define __MEM_COHERENT_XBAR_HH__ 53 54#include <unordered_map> 55#include <unordered_set> 56 57#include "mem/snoop_filter.hh" 58#include "mem/xbar.hh" 59#include "params/CoherentXBar.hh" 60 61/** 62 * A coherent crossbar connects a number of (potentially) snooping 63 * masters and slaves, and routes the request and response packets 64 * based on the address, and also forwards all requests to the 65 * snoopers and deals with the snoop responses. 66 * 67 * The coherent crossbar can be used as a template for modelling QPI, 68 * HyperTransport, ACE and coherent OCP buses, and is typically used 69 * for the L1-to-L2 buses and as the main system interconnect. @sa 70 * \ref gem5MemorySystem "gem5 Memory System" 71 */ 72class CoherentXBar : public BaseXBar 73{ 74 75 protected: 76 77 /** 78 * Declare the layers of this crossbar, one vector for requests, 79 * one for responses, and one for snoop responses 80 */ 81 std::vector<ReqLayer*> reqLayers; 82 std::vector<RespLayer*> respLayers; 83 std::vector<SnoopRespLayer*> snoopLayers; 84 85 /** 86 * Declaration of the coherent crossbar slave port type, one will 87 * be instantiated for each of the master ports connecting to the 88 * crossbar. 89 */ 90 class CoherentXBarSlavePort : public QueuedSlavePort 91 { 92 93 private: 94 95 /** A reference to the crossbar to which this port belongs. */ 96 CoherentXBar &xbar; 97 98 /** A normal packet queue used to store responses. */ 99 RespPacketQueue queue; 100 101 public: 102 103 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
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111 /** 112 * When receiving a timing request, pass it to the crossbar. 113 */ 114 virtual bool recvTimingReq(PacketPtr pkt) 115 { return xbar.recvTimingReq(pkt, id); }
| 111 bool 112 recvTimingReq(PacketPtr pkt) override 113 { 114 return xbar.recvTimingReq(pkt, id); 115 }
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116
| 116
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117 /** 118 * When receiving a timing snoop response, pass it to the crossbar. 119 */ 120 virtual bool recvTimingSnoopResp(PacketPtr pkt) 121 { return xbar.recvTimingSnoopResp(pkt, id); }
| 117 bool 118 recvTimingSnoopResp(PacketPtr pkt) override 119 { 120 return xbar.recvTimingSnoopResp(pkt, id); 121 }
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122
| 122
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123 /** 124 * When receiving an atomic request, pass it to the crossbar. 125 */ 126 virtual Tick recvAtomic(PacketPtr pkt) 127 { return xbar.recvAtomic(pkt, id); }
| 123 Tick 124 recvAtomic(PacketPtr pkt) override 125 { 126 return xbar.recvAtomic(pkt, id); 127 }
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128
| 128
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129 /** 130 * When receiving a functional request, pass it to the crossbar. 131 */ 132 virtual void recvFunctional(PacketPtr pkt) 133 { xbar.recvFunctional(pkt, id); }
| 129 void 130 recvFunctional(PacketPtr pkt) override 131 { 132 xbar.recvFunctional(pkt, id); 133 }
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134
| 134
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135 /** 136 * Return the union of all adress ranges seen by this crossbar. 137 */ 138 virtual AddrRangeList getAddrRanges() const 139 { return xbar.getAddrRanges(); }
| 135 AddrRangeList 136 getAddrRanges() const override 137 { 138 return xbar.getAddrRanges(); 139 }
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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 */ 148 class CoherentXBarMasterPort : public MasterPort 149 { 150 private: 151 /** A reference to the crossbar to which this port belongs. */ 152 CoherentXBar &xbar; 153 154 public: 155 156 CoherentXBarMasterPort(const std::string &_name, 157 CoherentXBar &_xbar, PortID _id) 158 : MasterPort(_name, &_xbar, _id), xbar(_xbar) 159 { } 160 161 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 */
| 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 */ 148 class CoherentXBarMasterPort : public MasterPort 149 { 150 private: 151 /** A reference to the crossbar to which this port belongs. */ 152 CoherentXBar &xbar; 153 154 public: 155 156 CoherentXBarMasterPort(const std::string &_name, 157 CoherentXBar &_xbar, PortID _id) 158 : MasterPort(_name, &_xbar, _id), xbar(_xbar) 159 { } 160 161 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 */
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169 virtual bool isSnooping() const 170 { return true; }
| 169 bool isSnooping() const override { return true; }
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171
| 170
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172 /** 173 * When receiving a timing response, pass it to the crossbar. 174 */ 175 virtual bool recvTimingResp(PacketPtr pkt) 176 { return xbar.recvTimingResp(pkt, id); }
| 171 bool 172 recvTimingResp(PacketPtr pkt) override 173 { 174 return xbar.recvTimingResp(pkt, id); 175 }
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177
| 176
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178 /** 179 * When receiving a timing snoop request, pass it to the crossbar. 180 */ 181 virtual void recvTimingSnoopReq(PacketPtr pkt) 182 { return xbar.recvTimingSnoopReq(pkt, id); }
| 177 void 178 recvTimingSnoopReq(PacketPtr pkt) override 179 { 180 return xbar.recvTimingSnoopReq(pkt, id); 181 }
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183
| 182
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184 /** 185 * When receiving an atomic snoop request, pass it to the crossbar. 186 */ 187 virtual Tick recvAtomicSnoop(PacketPtr pkt) 188 { return xbar.recvAtomicSnoop(pkt, id); }
| 183 Tick 184 recvAtomicSnoop(PacketPtr pkt) override 185 { 186 return xbar.recvAtomicSnoop(pkt, id); 187 }
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189
| 188
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190 /** 191 * When receiving a functional snoop request, pass it to the crossbar. 192 */ 193 virtual void recvFunctionalSnoop(PacketPtr pkt) 194 { xbar.recvFunctionalSnoop(pkt, id); }
| 189 void 190 recvFunctionalSnoop(PacketPtr pkt) override 191 { 192 xbar.recvFunctionalSnoop(pkt, id); 193 }
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195
| 194
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196 /** When reciving a range change from the peer port (at id), 197 pass it to the crossbar. */ 198 virtual void recvRangeChange() 199 { xbar.recvRangeChange(id); }
| 195 void recvRangeChange() override { xbar.recvRangeChange(id); } 196 void recvReqRetry() override { xbar.recvReqRetry(id); }
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200
| 197
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201 /** When reciving a retry from the peer port (at id), 202 pass it to the crossbar. */ 203 virtual void recvReqRetry() 204 { xbar.recvReqRetry(id); } 205
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206 }; 207 208 /** 209 * Internal class to bridge between an incoming snoop response 210 * from a slave port and forwarding it through an outgoing slave 211 * port. It is effectively a dangling master port. 212 */ 213 class SnoopRespPort : public MasterPort 214 { 215 216 private: 217 218 /** The port which we mirror internally. */ 219 QueuedSlavePort& slavePort; 220 221 public: 222 223 /** 224 * Create a snoop response port that mirrors a given slave port. 225 */ 226 SnoopRespPort(QueuedSlavePort& slave_port, CoherentXBar& _xbar) : 227 MasterPort(slave_port.name() + ".snoopRespPort", &_xbar), 228 slavePort(slave_port) { } 229 230 /** 231 * Override the sending of retries and pass them on through 232 * the mirrored slave port. 233 */
| 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 206 { 207 208 private: 209 210 /** The port which we mirror internally. */ 211 QueuedSlavePort& slavePort; 212 213 public: 214 215 /** 216 * Create a snoop response port that mirrors a given slave port. 217 */ 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 */
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234 void sendRetryResp() {
| 226 void 227 sendRetryResp() override 228 {
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235 // forward it as a snoop response retry 236 slavePort.sendRetrySnoopResp(); 237 } 238
| 229 // forward it as a snoop response retry 230 slavePort.sendRetrySnoopResp(); 231 } 232
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239 /** 240 * Provided as necessary. 241 */ 242 void recvReqRetry() { panic("SnoopRespPort should never see retry\n"); }
| 233 void 234 recvReqRetry() override 235 { 236 panic("SnoopRespPort should never see retry"); 237 }
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243
| 238
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244 /** 245 * Provided as necessary. 246 */ 247 bool recvTimingResp(PacketPtr pkt)
| 239 bool 240 recvTimingResp(PacketPtr pkt) override
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248 {
| 241 {
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249 panic("SnoopRespPort should never see timing response\n"); 250 return false;
| 242 panic("SnoopRespPort should never see timing response");
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251 } 252 253 }; 254 255 std::vector<SnoopRespPort*> snoopRespPorts; 256 257 std::vector<QueuedSlavePort*> snoopPorts; 258 259 /** 260 * Store the outstanding requests that we are expecting snoop 261 * responses from so we can determine which snoop responses we 262 * generated and which ones were merely forwarded. 263 */ 264 std::unordered_set<RequestPtr> outstandingSnoop; 265 266 /** 267 * Store the outstanding cache maintenance that we are expecting 268 * snoop responses from so we can determine when we received all 269 * snoop responses and if any of the agents satisfied the request. 270 */ 271 std::unordered_map<PacketId, PacketPtr> outstandingCMO; 272 273 /** 274 * Keep a pointer to the system to be allow to querying memory system 275 * properties. 276 */ 277 System *system; 278 279 /** A snoop filter that tracks cache line residency and can restrict the 280 * broadcast needed for probes. NULL denotes an absent filter. */ 281 SnoopFilter *snoopFilter; 282
| 243 } 244 245 }; 246 247 std::vector<SnoopRespPort*> snoopRespPorts; 248 249 std::vector<QueuedSlavePort*> snoopPorts; 250 251 /** 252 * Store the outstanding requests that we are expecting snoop 253 * responses from so we can determine which snoop responses we 254 * generated and which ones were merely forwarded. 255 */ 256 std::unordered_set<RequestPtr> outstandingSnoop; 257 258 /** 259 * Store the outstanding cache maintenance that we are expecting 260 * snoop responses from so we can determine when we received all 261 * snoop responses and if any of the agents satisfied the request. 262 */ 263 std::unordered_map<PacketId, PacketPtr> outstandingCMO; 264 265 /** 266 * Keep a pointer to the system to be allow to querying memory system 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
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283 /** Cycles of snoop response latency.*/
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284 const Cycles snoopResponseLatency;
| 275 const Cycles snoopResponseLatency;
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285 286 /** Is this crossbar the point of coherency? **/
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287 const bool pointOfCoherency;
| 276 const bool pointOfCoherency;
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288 289 /** Is this crossbar the point of unification? **/
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290 const bool pointOfUnification; 291 292 /** 293 * Upstream caches need this packet until true is returned, so 294 * hold it for deletion until a subsequent call 295 */ 296 std::unique_ptr<Packet> pendingDelete; 297
| 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
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298 /** Function called by the port when the crossbar is recieving a Timing 299 request packet.*/
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300 bool recvTimingReq(PacketPtr pkt, PortID slave_port_id);
| 285 bool recvTimingReq(PacketPtr pkt, PortID slave_port_id);
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301 302 /** Function called by the port when the crossbar is recieving a Timing 303 response packet.*/
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304 bool recvTimingResp(PacketPtr pkt, PortID master_port_id);
| 286 bool recvTimingResp(PacketPtr pkt, PortID master_port_id);
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305 306 /** Function called by the port when the crossbar is recieving a timing 307 snoop request.*/
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308 void recvTimingSnoopReq(PacketPtr pkt, PortID master_port_id);
| 287 void recvTimingSnoopReq(PacketPtr pkt, PortID master_port_id);
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309 310 /** Function called by the port when the crossbar is recieving a timing 311 snoop response.*/
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312 bool recvTimingSnoopResp(PacketPtr pkt, PortID slave_port_id);
| 288 bool recvTimingSnoopResp(PacketPtr pkt, PortID slave_port_id);
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313 314 /** Timing function called by port when it is once again able to process 315 * requests. */
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316 void recvReqRetry(PortID master_port_id); 317 318 /** 319 * Forward a timing packet to our snoopers, potentially excluding 320 * one of the connected coherent masters to avoid sending a packet 321 * back to where it came from. 322 * 323 * @param pkt Packet to forward 324 * @param exclude_slave_port_id Id of slave port to exclude 325 */
| 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 */
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326 void forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id) {
| 299 void 300 forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id) 301 {
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327 forwardTiming(pkt, exclude_slave_port_id, snoopPorts); 328 } 329 330 /** 331 * Forward a timing packet to a selected list of snoopers, potentially 332 * excluding one of the connected coherent masters to avoid sending a packet 333 * back to where it came from. 334 * 335 * @param pkt Packet to forward 336 * @param exclude_slave_port_id Id of slave port to exclude 337 * @param dests Vector of destination ports for the forwarded pkt 338 */ 339 void forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id, 340 const std::vector<QueuedSlavePort*>& dests); 341
| 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
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342 /** Function called by the port when the crossbar is recieving a Atomic 343 transaction.*/
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344 Tick recvAtomic(PacketPtr pkt, PortID slave_port_id);
| 317 Tick recvAtomic(PacketPtr pkt, PortID slave_port_id);
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345 346 /** Function called by the port when the crossbar is recieving an 347 atomic snoop transaction.*/
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348 Tick recvAtomicSnoop(PacketPtr pkt, PortID master_port_id); 349 350 /** 351 * Forward an atomic packet to our snoopers, potentially excluding 352 * one of the connected coherent masters to avoid sending a packet 353 * back to where it came from. 354 * 355 * @param pkt Packet to forward 356 * @param exclude_slave_port_id Id of slave port to exclude 357 * 358 * @return a pair containing the snoop response and snoop latency 359 */
| 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 */
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360 std::pair<MemCmd, Tick> forwardAtomic(PacketPtr pkt, 361 PortID exclude_slave_port_id)
| 330 std::pair 331 forwardAtomic(PacketPtr pkt, PortID exclude_slave_port_id)
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362 { 363 return forwardAtomic(pkt, exclude_slave_port_id, InvalidPortID, 364 snoopPorts); 365 } 366 367 /** 368 * Forward an atomic packet to a selected list of snoopers, potentially 369 * excluding one of the connected coherent masters to avoid sending a packet 370 * back to where it came from. 371 * 372 * @param pkt Packet to forward 373 * @param exclude_slave_port_id Id of slave port to exclude 374 * @param source_master_port_id Id of the master port for snoops from below 375 * @param dests Vector of destination ports for the forwarded pkt 376 * 377 * @return a pair containing the snoop response and snoop latency 378 */ 379 std::pair<MemCmd, Tick> forwardAtomic(PacketPtr pkt, 380 PortID exclude_slave_port_id, 381 PortID source_master_port_id, 382 const std::vector<QueuedSlavePort*>& 383 dests); 384 385 /** Function called by the port when the crossbar is recieving a Functional 386 transaction.*/ 387 void recvFunctional(PacketPtr pkt, PortID slave_port_id); 388 389 /** Function called by the port when the crossbar is recieving a functional 390 snoop transaction.*/ 391 void recvFunctionalSnoop(PacketPtr pkt, PortID master_port_id); 392 393 /** 394 * Forward a functional packet to our snoopers, potentially 395 * excluding one of the connected coherent masters to avoid 396 * sending a packet back to where it came from. 397 * 398 * @param pkt Packet to forward 399 * @param exclude_slave_port_id Id of slave port to exclude 400 */ 401 void forwardFunctional(PacketPtr pkt, PortID exclude_slave_port_id); 402 403 /** 404 * Determine if the crossbar should sink the packet, as opposed to 405 * forwarding it, or responding. 406 */ 407 bool sinkPacket(const PacketPtr pkt) const; 408 409 /** 410 * Determine if the crossbar should forward the packet, as opposed to 411 * responding to it. 412 */ 413 bool forwardPacket(const PacketPtr pkt); 414 415 /** 416 * Determine if the packet's destination is the memory below 417 * 418 * The memory below is the destination for a cache mainteance 419 * operation to the Point of Coherence/Unification if this is the 420 * Point of Coherence/Unification. 421 * 422 * @param pkt The processed packet 423 * 424 * @return Whether the memory below is the destination for the packet 425 */
| 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 340 * back to where it came from. 341 * 342 * @param pkt Packet to forward 343 * @param exclude_slave_port_id Id of slave port to exclude 344 * @param source_master_port_id Id of the master port for snoops from below 345 * @param dests Vector of destination ports for the forwarded pkt 346 * 347 * @return a pair containing the snoop response and snoop latency 348 */ 349 std::pair<MemCmd, Tick> forwardAtomic(PacketPtr pkt, 350 PortID exclude_slave_port_id, 351 PortID source_master_port_id, 352 const std::vector<QueuedSlavePort*>& 353 dests); 354 355 /** Function called by the port when the crossbar is recieving a Functional 356 transaction.*/ 357 void recvFunctional(PacketPtr pkt, PortID slave_port_id); 358 359 /** Function called by the port when the crossbar is recieving a functional 360 snoop transaction.*/ 361 void recvFunctionalSnoop(PacketPtr pkt, PortID master_port_id); 362 363 /** 364 * Forward a functional packet to our snoopers, potentially 365 * excluding one of the connected coherent masters to avoid 366 * sending a packet back to where it came from. 367 * 368 * @param pkt Packet to forward 369 * @param exclude_slave_port_id Id of slave port to exclude 370 */ 371 void forwardFunctional(PacketPtr pkt, PortID exclude_slave_port_id); 372 373 /** 374 * Determine if the crossbar should sink the packet, as opposed to 375 * forwarding it, or responding. 376 */ 377 bool sinkPacket(const PacketPtr pkt) const; 378 379 /** 380 * Determine if the crossbar should forward the packet, as opposed to 381 * responding to it. 382 */ 383 bool forwardPacket(const PacketPtr pkt); 384 385 /** 386 * Determine if the packet's destination is the memory below 387 * 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 */
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426 bool isDestination(const PacketPtr pkt) const
| 396 bool 397 isDestination(const PacketPtr pkt) const
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427 { 428 return (pkt->req->isToPOC() && pointOfCoherency) || 429 (pkt->req->isToPOU() && pointOfUnification); 430 } 431 432 Stats::Scalar snoops; 433 Stats::Scalar snoopTraffic; 434 Stats::Distribution snoopFanout; 435 436 public: 437 438 virtual void init(); 439 440 CoherentXBar(const CoherentXBarParams *p); 441 442 virtual ~CoherentXBar(); 443 444 virtual void regStats(); 445}; 446 447#endif //__MEM_COHERENT_XBAR_HH__
| 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; 406 407 public: 408 409 virtual void init(); 410 411 CoherentXBar(const CoherentXBarParams *p); 412 413 virtual ~CoherentXBar(); 414 415 virtual void regStats(); 416}; 417 418#endif //__MEM_COHERENT_XBAR_HH__
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