coherent_xbar.cc revision 11127
12497SN/A/* 210719SMarco.Balboni@ARM.com * Copyright (c) 2011-2015 ARM Limited 38711SN/A * All rights reserved 48711SN/A * 58711SN/A * The license below extends only to copyright in the software and shall 68711SN/A * not be construed as granting a license to any other intellectual 78711SN/A * property including but not limited to intellectual property relating 88711SN/A * to a hardware implementation of the functionality of the software 98711SN/A * licensed hereunder. You may use the software subject to the license 108711SN/A * terms below provided that you ensure that this notice is replicated 118711SN/A * unmodified and in its entirety in all distributions of the software, 128711SN/A * modified or unmodified, in source code or in binary form. 138711SN/A * 142497SN/A * Copyright (c) 2006 The Regents of The University of Michigan 152497SN/A * All rights reserved. 162497SN/A * 172497SN/A * Redistribution and use in source and binary forms, with or without 182497SN/A * modification, are permitted provided that the following conditions are 192497SN/A * met: redistributions of source code must retain the above copyright 202497SN/A * notice, this list of conditions and the following disclaimer; 212497SN/A * redistributions in binary form must reproduce the above copyright 222497SN/A * notice, this list of conditions and the following disclaimer in the 232497SN/A * documentation and/or other materials provided with the distribution; 242497SN/A * neither the name of the copyright holders nor the names of its 252497SN/A * contributors may be used to endorse or promote products derived from 262497SN/A * this software without specific prior written permission. 272497SN/A * 282497SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 292497SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 302497SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 312497SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 322497SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 332497SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 342497SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 352497SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 362497SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 372497SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 382497SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 392665SN/A * 402665SN/A * Authors: Ali Saidi 418715SN/A * Andreas Hansson 428922SN/A * William Wang 432497SN/A */ 442497SN/A 452497SN/A/** 462982SN/A * @file 4710405Sandreas.hansson@arm.com * Definition of a crossbar object. 482497SN/A */ 492497SN/A 502846SN/A#include "base/misc.hh" 512548SN/A#include "base/trace.hh" 5210405Sandreas.hansson@arm.com#include "debug/AddrRanges.hh" 5310405Sandreas.hansson@arm.com#include "debug/CoherentXBar.hh" 5410405Sandreas.hansson@arm.com#include "mem/coherent_xbar.hh" 559524SN/A#include "sim/system.hh" 562497SN/A 5710405Sandreas.hansson@arm.comCoherentXBar::CoherentXBar(const CoherentXBarParams *p) 5810719SMarco.Balboni@ARM.com : BaseXBar(p), system(p->system), snoopFilter(p->snoop_filter), 5910719SMarco.Balboni@ARM.com snoopResponseLatency(p->snoop_response_latency) 607523SN/A{ 618851SN/A // create the ports based on the size of the master and slave 628948SN/A // vector ports, and the presence of the default port, the ports 638948SN/A // are enumerated starting from zero 648851SN/A for (int i = 0; i < p->port_master_connection_count; ++i) { 659095SN/A std::string portName = csprintf("%s.master[%d]", name(), i); 6610405Sandreas.hansson@arm.com MasterPort* bp = new CoherentXBarMasterPort(portName, *this, i); 678922SN/A masterPorts.push_back(bp); 689715SN/A reqLayers.push_back(new ReqLayer(*bp, *this, 699715SN/A csprintf(".reqLayer%d", i))); 7010713Sandreas.hansson@arm.com snoopLayers.push_back(new SnoopRespLayer(*bp, *this, 7110713Sandreas.hansson@arm.com csprintf(".snoopLayer%d", i))); 728851SN/A } 738851SN/A 748948SN/A // see if we have a default slave device connected and if so add 758948SN/A // our corresponding master port 768915SN/A if (p->port_default_connection_count) { 779031SN/A defaultPortID = masterPorts.size(); 789095SN/A std::string portName = name() + ".default"; 7910405Sandreas.hansson@arm.com MasterPort* bp = new CoherentXBarMasterPort(portName, *this, 809036SN/A defaultPortID); 818922SN/A masterPorts.push_back(bp); 829715SN/A reqLayers.push_back(new ReqLayer(*bp, *this, csprintf(".reqLayer%d", 839715SN/A defaultPortID))); 8410713Sandreas.hansson@arm.com snoopLayers.push_back(new SnoopRespLayer(*bp, *this, 8510713Sandreas.hansson@arm.com csprintf(".snoopLayer%d", 8610713Sandreas.hansson@arm.com defaultPortID))); 878915SN/A } 888915SN/A 898948SN/A // create the slave ports, once again starting at zero 908851SN/A for (int i = 0; i < p->port_slave_connection_count; ++i) { 919095SN/A std::string portName = csprintf("%s.slave[%d]", name(), i); 9210888Sandreas.hansson@arm.com QueuedSlavePort* bp = new CoherentXBarSlavePort(portName, *this, i); 938922SN/A slavePorts.push_back(bp); 949715SN/A respLayers.push_back(new RespLayer(*bp, *this, 959715SN/A csprintf(".respLayer%d", i))); 969716SN/A snoopRespPorts.push_back(new SnoopRespPort(*bp, *this)); 978851SN/A } 988851SN/A 9910402SN/A if (snoopFilter) 10010402SN/A snoopFilter->setSlavePorts(slavePorts); 10110402SN/A 1027523SN/A clearPortCache(); 1037523SN/A} 1047523SN/A 10510405Sandreas.hansson@arm.comCoherentXBar::~CoherentXBar() 1069715SN/A{ 10710405Sandreas.hansson@arm.com for (auto l: reqLayers) 10810405Sandreas.hansson@arm.com delete l; 10910405Sandreas.hansson@arm.com for (auto l: respLayers) 11010405Sandreas.hansson@arm.com delete l; 11110405Sandreas.hansson@arm.com for (auto l: snoopLayers) 11210405Sandreas.hansson@arm.com delete l; 11310405Sandreas.hansson@arm.com for (auto p: snoopRespPorts) 11410405Sandreas.hansson@arm.com delete p; 1159715SN/A} 1169715SN/A 1172568SN/Avoid 11810405Sandreas.hansson@arm.comCoherentXBar::init() 1192568SN/A{ 1209278SN/A // the base class is responsible for determining the block size 12110405Sandreas.hansson@arm.com BaseXBar::init(); 1229278SN/A 1238948SN/A // iterate over our slave ports and determine which of our 1248948SN/A // neighbouring master ports are snooping and add them as snoopers 12510405Sandreas.hansson@arm.com for (const auto& p: slavePorts) { 1269088SN/A // check if the connected master port is snooping 12710405Sandreas.hansson@arm.com if (p->isSnooping()) { 12810405Sandreas.hansson@arm.com DPRINTF(AddrRanges, "Adding snooping master %s\n", 12910405Sandreas.hansson@arm.com p->getMasterPort().name()); 13010405Sandreas.hansson@arm.com snoopPorts.push_back(p); 1318711SN/A } 1328711SN/A } 1332568SN/A 1349036SN/A if (snoopPorts.empty()) 13510405Sandreas.hansson@arm.com warn("CoherentXBar %s has no snooping ports attached!\n", name()); 1363244SN/A} 1373244SN/A 1388948SN/Abool 13910405Sandreas.hansson@arm.comCoherentXBar::recvTimingReq(PacketPtr pkt, PortID slave_port_id) 1403244SN/A{ 14110883Sali.jafri@arm.com // @todo temporary hack to deal with memory corruption issue until 14210883Sali.jafri@arm.com // 4-phase transactions are complete 14310883Sali.jafri@arm.com for (int x = 0; x < pendingDelete.size(); x++) 14410883Sali.jafri@arm.com delete pendingDelete[x]; 14510883Sali.jafri@arm.com pendingDelete.clear(); 14610883Sali.jafri@arm.com 1478975SN/A // determine the source port based on the id 1489032SN/A SlavePort *src_port = slavePorts[slave_port_id]; 1493244SN/A 1509091SN/A // remember if the packet is an express snoop 1519091SN/A bool is_express_snoop = pkt->isExpressSnoop(); 15210656Sandreas.hansson@arm.com bool is_inhibited = pkt->memInhibitAsserted(); 15310656Sandreas.hansson@arm.com // for normal requests, going downstream, the express snoop flag 15410656Sandreas.hansson@arm.com // and the inhibited flag should always be the same 15510656Sandreas.hansson@arm.com assert(is_express_snoop == is_inhibited); 1569091SN/A 1579612SN/A // determine the destination based on the address 1589712SN/A PortID master_port_id = findPort(pkt->getAddr()); 1599612SN/A 16010405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the current 1619033SN/A // port, and exclude express snoops from the check 1629715SN/A if (!is_express_snoop && !reqLayers[master_port_id]->tryTiming(src_port)) { 16310405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x BUSY\n", 1648949SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 1653244SN/A return false; 1663244SN/A } 1673244SN/A 16810405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s expr %d 0x%x\n", 1699091SN/A src_port->name(), pkt->cmdString(), is_express_snoop, 1709091SN/A pkt->getAddr()); 1715197SN/A 1729712SN/A // store size and command as they might be modified when 1739712SN/A // forwarding the packet 1749712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 1759712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 1769712SN/A 17710719SMarco.Balboni@ARM.com // store the old header delay so we can restore it if needed 17810719SMarco.Balboni@ARM.com Tick old_header_delay = pkt->headerDelay; 17910719SMarco.Balboni@ARM.com 18010719SMarco.Balboni@ARM.com // a request sees the frontend and forward latency 18110719SMarco.Balboni@ARM.com Tick xbar_delay = (frontendLatency + forwardLatency) * clockPeriod(); 18210719SMarco.Balboni@ARM.com 18310719SMarco.Balboni@ARM.com // set the packet header and payload delay 18410719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 18510719SMarco.Balboni@ARM.com 18610719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 18710719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 1884912SN/A 18910821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 19011127Sandreas.hansson@arm.com assert(pkt->snoopDelay == 0); 19111127Sandreas.hansson@arm.com 1928979SN/A // the packet is a memory-mapped request and should be 1938979SN/A // broadcasted to our snoopers but the source 19410402SN/A if (snoopFilter) { 19510402SN/A // check with the snoop filter where to forward this packet 19610402SN/A auto sf_res = snoopFilter->lookupRequest(pkt, *src_port); 19711126Sandreas.hansson@arm.com // the time required by a packet to be delivered through 19811126Sandreas.hansson@arm.com // the xbar has to be charged also with to lookup latency 19911126Sandreas.hansson@arm.com // of the snoop filter 20010719SMarco.Balboni@ARM.com pkt->headerDelay += sf_res.second * clockPeriod(); 20110405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x"\ 20210402SN/A " SF size: %i lat: %i\n", src_port->name(), 20310402SN/A pkt->cmdString(), pkt->getAddr(), sf_res.first.size(), 20410402SN/A sf_res.second); 20510402SN/A forwardTiming(pkt, slave_port_id, sf_res.first); 20610402SN/A } else { 20710402SN/A forwardTiming(pkt, slave_port_id); 20810402SN/A } 20911127Sandreas.hansson@arm.com 21011127Sandreas.hansson@arm.com // add the snoop delay to our header delay, and then reset it 21111127Sandreas.hansson@arm.com pkt->headerDelay += pkt->snoopDelay; 21211127Sandreas.hansson@arm.com pkt->snoopDelay = 0; 2138979SN/A } 2148948SN/A 21510883Sali.jafri@arm.com // forwardTiming snooped into peer caches of the sender, and if 21610883Sali.jafri@arm.com // this is a clean evict, but the packet is found in a cache, do 21710883Sali.jafri@arm.com // not forward it 21810883Sali.jafri@arm.com if (pkt->cmd == MemCmd::CleanEvict && pkt->isBlockCached()) { 21910883Sali.jafri@arm.com DPRINTF(CoherentXBar, "recvTimingReq: Clean evict 0x%x still cached, " 22010883Sali.jafri@arm.com "not forwarding\n", pkt->getAddr()); 22110883Sali.jafri@arm.com 22210883Sali.jafri@arm.com // update the layer state and schedule an idle event 22310883Sali.jafri@arm.com reqLayers[master_port_id]->succeededTiming(packetFinishTime); 22410883Sali.jafri@arm.com pendingDelete.push_back(pkt); 22510883Sali.jafri@arm.com return true; 22610883Sali.jafri@arm.com } 22710883Sali.jafri@arm.com 22810656Sandreas.hansson@arm.com // remember if the packet will generate a snoop response 22910656Sandreas.hansson@arm.com const bool expect_snoop_resp = !is_inhibited && pkt->memInhibitAsserted(); 23010656Sandreas.hansson@arm.com const bool expect_response = pkt->needsResponse() && 23110656Sandreas.hansson@arm.com !pkt->memInhibitAsserted(); 2328915SN/A 23310402SN/A // Note: Cannot create a copy of the full packet, here. 23410402SN/A MemCmd orig_cmd(pkt->cmd); 23510402SN/A 2369612SN/A // since it is a normal request, attempt to send the packet 2379712SN/A bool success = masterPorts[master_port_id]->sendTimingReq(pkt); 2388948SN/A 23910821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches()) { 24010402SN/A // The packet may already be overwritten by the sendTimingReq function. 24110402SN/A // The snoop filter needs to see the original request *and* the return 24210402SN/A // status of the send operation, so we need to recreate the original 24310402SN/A // request. Atomic mode does not have the issue, as there the send 24410402SN/A // operation and the response happen instantaneously and don't need two 24510402SN/A // phase tracking. 24610402SN/A MemCmd tmp_cmd(pkt->cmd); 24710402SN/A pkt->cmd = orig_cmd; 24810402SN/A // Let the snoop filter know about the success of the send operation 24910402SN/A snoopFilter->updateRequest(pkt, *src_port, !success); 25010402SN/A pkt->cmd = tmp_cmd; 25110402SN/A } 25210402SN/A 25310656Sandreas.hansson@arm.com // check if we were successful in sending the packet onwards 25410656Sandreas.hansson@arm.com if (!success) { 25510656Sandreas.hansson@arm.com // express snoops and inhibited packets should never be forced 25610656Sandreas.hansson@arm.com // to retry 25710656Sandreas.hansson@arm.com assert(!is_express_snoop); 25810656Sandreas.hansson@arm.com assert(!pkt->memInhibitAsserted()); 25910656Sandreas.hansson@arm.com 26010719SMarco.Balboni@ARM.com // restore the header delay 26110719SMarco.Balboni@ARM.com pkt->headerDelay = old_header_delay; 26210656Sandreas.hansson@arm.com 26310656Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x RETRY\n", 26410656Sandreas.hansson@arm.com src_port->name(), pkt->cmdString(), pkt->getAddr()); 26510656Sandreas.hansson@arm.com 26610656Sandreas.hansson@arm.com // update the layer state and schedule an idle event 26710656Sandreas.hansson@arm.com reqLayers[master_port_id]->failedTiming(src_port, 26810719SMarco.Balboni@ARM.com clockEdge(Cycles(1))); 2699091SN/A } else { 27010656Sandreas.hansson@arm.com // express snoops currently bypass the crossbar state entirely 27110656Sandreas.hansson@arm.com if (!is_express_snoop) { 27210656Sandreas.hansson@arm.com // if this particular request will generate a snoop 27310656Sandreas.hansson@arm.com // response 27410656Sandreas.hansson@arm.com if (expect_snoop_resp) { 27510656Sandreas.hansson@arm.com // we should never have an exsiting request outstanding 27610656Sandreas.hansson@arm.com assert(outstandingSnoop.find(pkt->req) == 27710656Sandreas.hansson@arm.com outstandingSnoop.end()); 27810656Sandreas.hansson@arm.com outstandingSnoop.insert(pkt->req); 2798948SN/A 28010656Sandreas.hansson@arm.com // basic sanity check on the outstanding snoops 28110656Sandreas.hansson@arm.com panic_if(outstandingSnoop.size() > 512, 28210656Sandreas.hansson@arm.com "Outstanding snoop requests exceeded 512\n"); 28310656Sandreas.hansson@arm.com } 2848948SN/A 28510656Sandreas.hansson@arm.com // remember where to route the normal response to 28610656Sandreas.hansson@arm.com if (expect_response || expect_snoop_resp) { 28710656Sandreas.hansson@arm.com assert(routeTo.find(pkt->req) == routeTo.end()); 28810656Sandreas.hansson@arm.com routeTo[pkt->req] = slave_port_id; 2899549SN/A 29010656Sandreas.hansson@arm.com panic_if(routeTo.size() > 512, 29110656Sandreas.hansson@arm.com "Routing table exceeds 512 packets\n"); 29210656Sandreas.hansson@arm.com } 2938948SN/A 29410405Sandreas.hansson@arm.com // update the layer state and schedule an idle event 2959715SN/A reqLayers[master_port_id]->succeededTiming(packetFinishTime); 2969091SN/A } 2978975SN/A 29810656Sandreas.hansson@arm.com // stats updates only consider packets that were successfully sent 2999712SN/A pktCount[slave_port_id][master_port_id]++; 30010405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 3019712SN/A transDist[pkt_cmd]++; 30210656Sandreas.hansson@arm.com 30310656Sandreas.hansson@arm.com if (is_express_snoop) 30410656Sandreas.hansson@arm.com snoops++; 3059712SN/A } 3069712SN/A 3079091SN/A return success; 3088975SN/A} 3098975SN/A 3108975SN/Abool 31110405Sandreas.hansson@arm.comCoherentXBar::recvTimingResp(PacketPtr pkt, PortID master_port_id) 3128975SN/A{ 3138975SN/A // determine the source port based on the id 3149032SN/A MasterPort *src_port = masterPorts[master_port_id]; 3158975SN/A 31610656Sandreas.hansson@arm.com // determine the destination 31710656Sandreas.hansson@arm.com const auto route_lookup = routeTo.find(pkt->req); 31810656Sandreas.hansson@arm.com assert(route_lookup != routeTo.end()); 31910656Sandreas.hansson@arm.com const PortID slave_port_id = route_lookup->second; 32010572Sandreas.hansson@arm.com assert(slave_port_id != InvalidPortID); 32110572Sandreas.hansson@arm.com assert(slave_port_id < respLayers.size()); 3229713SN/A 32310405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the 32410405Sandreas.hansson@arm.com // current port 3259715SN/A if (!respLayers[slave_port_id]->tryTiming(src_port)) { 32610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingResp: src %s %s 0x%x BUSY\n", 3278975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 3288975SN/A return false; 3298975SN/A } 3308975SN/A 33110405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingResp: src %s %s 0x%x\n", 3328975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 3338975SN/A 3349712SN/A // store size and command as they might be modified when 3359712SN/A // forwarding the packet 3369712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 3379712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 3389712SN/A 33910719SMarco.Balboni@ARM.com // a response sees the response latency 34010719SMarco.Balboni@ARM.com Tick xbar_delay = responseLatency * clockPeriod(); 34110719SMarco.Balboni@ARM.com 34210719SMarco.Balboni@ARM.com // set the packet header and payload delay 34310719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 34410719SMarco.Balboni@ARM.com 34510719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 34610719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 3478975SN/A 34810821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches()) { 34910402SN/A // let the snoop filter inspect the response and update its state 35010402SN/A snoopFilter->updateResponse(pkt, *slavePorts[slave_port_id]); 35110402SN/A } 35210402SN/A 35310888Sandreas.hansson@arm.com // send the packet through the destination slave port and pay for 35410888Sandreas.hansson@arm.com // any outstanding header delay 35510888Sandreas.hansson@arm.com Tick latency = pkt->headerDelay; 35610888Sandreas.hansson@arm.com pkt->headerDelay = 0; 35710888Sandreas.hansson@arm.com slavePorts[slave_port_id]->schedTimingResp(pkt, curTick() + latency); 3588975SN/A 35910656Sandreas.hansson@arm.com // remove the request from the routing table 36010656Sandreas.hansson@arm.com routeTo.erase(route_lookup); 36110656Sandreas.hansson@arm.com 3629715SN/A respLayers[slave_port_id]->succeededTiming(packetFinishTime); 3638975SN/A 3649712SN/A // stats updates 3659712SN/A pktCount[slave_port_id][master_port_id]++; 36610405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 3679712SN/A transDist[pkt_cmd]++; 3689712SN/A 3698975SN/A return true; 3708975SN/A} 3718975SN/A 3728975SN/Avoid 37310405Sandreas.hansson@arm.comCoherentXBar::recvTimingSnoopReq(PacketPtr pkt, PortID master_port_id) 3748975SN/A{ 37510405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopReq: src %s %s 0x%x\n", 3769032SN/A masterPorts[master_port_id]->name(), pkt->cmdString(), 3778975SN/A pkt->getAddr()); 3788975SN/A 3799712SN/A // update stats here as we know the forwarding will succeed 3809712SN/A transDist[pkt->cmdToIndex()]++; 38110405Sandreas.hansson@arm.com snoops++; 3829712SN/A 3838975SN/A // we should only see express snoops from caches 3848975SN/A assert(pkt->isExpressSnoop()); 3858975SN/A 38611127Sandreas.hansson@arm.com // set the packet header and payload delay, for now use forward latency 38711127Sandreas.hansson@arm.com // @todo Assess the choice of latency further 38811127Sandreas.hansson@arm.com calcPacketTiming(pkt, forwardLatency * clockPeriod()); 38911127Sandreas.hansson@arm.com 39010656Sandreas.hansson@arm.com // remeber if the packet is inhibited so we can see if it changes 39110656Sandreas.hansson@arm.com const bool is_inhibited = pkt->memInhibitAsserted(); 3929032SN/A 39311127Sandreas.hansson@arm.com assert(pkt->snoopDelay == 0); 39411127Sandreas.hansson@arm.com 39510402SN/A if (snoopFilter) { 39610402SN/A // let the Snoop Filter work its magic and guide probing 39710402SN/A auto sf_res = snoopFilter->lookupSnoop(pkt); 39811126Sandreas.hansson@arm.com // the time required by a packet to be delivered through 39911126Sandreas.hansson@arm.com // the xbar has to be charged also with to lookup latency 40011126Sandreas.hansson@arm.com // of the snoop filter 40111126Sandreas.hansson@arm.com pkt->headerDelay += sf_res.second * clockPeriod(); 40210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopReq: src %s %s 0x%x"\ 40310402SN/A " SF size: %i lat: %i\n", masterPorts[master_port_id]->name(), 40410402SN/A pkt->cmdString(), pkt->getAddr(), sf_res.first.size(), 40510402SN/A sf_res.second); 40610402SN/A 40710402SN/A // forward to all snoopers 40810402SN/A forwardTiming(pkt, InvalidPortID, sf_res.first); 40910402SN/A } else { 41010402SN/A forwardTiming(pkt, InvalidPortID); 41110402SN/A } 4128975SN/A 41311127Sandreas.hansson@arm.com // add the snoop delay to our header delay, and then reset it 41411127Sandreas.hansson@arm.com pkt->headerDelay += pkt->snoopDelay; 41511127Sandreas.hansson@arm.com pkt->snoopDelay = 0; 41611127Sandreas.hansson@arm.com 41710656Sandreas.hansson@arm.com // if we can expect a response, remember how to route it 41810656Sandreas.hansson@arm.com if (!is_inhibited && pkt->memInhibitAsserted()) { 41910656Sandreas.hansson@arm.com assert(routeTo.find(pkt->req) == routeTo.end()); 42010656Sandreas.hansson@arm.com routeTo[pkt->req] = master_port_id; 42110656Sandreas.hansson@arm.com } 42210656Sandreas.hansson@arm.com 4238975SN/A // a snoop request came from a connected slave device (one of 4248975SN/A // our master ports), and if it is not coming from the slave 4258975SN/A // device responsible for the address range something is 4268975SN/A // wrong, hence there is nothing further to do as the packet 4278975SN/A // would be going back to where it came from 4289032SN/A assert(master_port_id == findPort(pkt->getAddr())); 4298975SN/A} 4308975SN/A 4318975SN/Abool 43210405Sandreas.hansson@arm.comCoherentXBar::recvTimingSnoopResp(PacketPtr pkt, PortID slave_port_id) 4338975SN/A{ 4348975SN/A // determine the source port based on the id 4359032SN/A SlavePort* src_port = slavePorts[slave_port_id]; 4368975SN/A 43710656Sandreas.hansson@arm.com // get the destination 43810656Sandreas.hansson@arm.com const auto route_lookup = routeTo.find(pkt->req); 43910656Sandreas.hansson@arm.com assert(route_lookup != routeTo.end()); 44010656Sandreas.hansson@arm.com const PortID dest_port_id = route_lookup->second; 44110572Sandreas.hansson@arm.com assert(dest_port_id != InvalidPortID); 4429714SN/A 4439714SN/A // determine if the response is from a snoop request we 4449714SN/A // created as the result of a normal request (in which case it 44510656Sandreas.hansson@arm.com // should be in the outstandingSnoop), or if we merely forwarded 4469714SN/A // someone else's snoop request 44710656Sandreas.hansson@arm.com const bool forwardAsSnoop = outstandingSnoop.find(pkt->req) == 44810656Sandreas.hansson@arm.com outstandingSnoop.end(); 4499714SN/A 45010405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the 45110405Sandreas.hansson@arm.com // current port, note that the check is bypassed if the response 45210405Sandreas.hansson@arm.com // is being passed on as a normal response since this is occupying 45310405Sandreas.hansson@arm.com // the response layer rather than the snoop response layer 4549715SN/A if (forwardAsSnoop) { 45510572Sandreas.hansson@arm.com assert(dest_port_id < snoopLayers.size()); 4569715SN/A if (!snoopLayers[dest_port_id]->tryTiming(src_port)) { 45710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n", 4589715SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 4599715SN/A return false; 4609715SN/A } 4619716SN/A } else { 4629716SN/A // get the master port that mirrors this slave port internally 4639716SN/A MasterPort* snoop_port = snoopRespPorts[slave_port_id]; 46410572Sandreas.hansson@arm.com assert(dest_port_id < respLayers.size()); 4659716SN/A if (!respLayers[dest_port_id]->tryTiming(snoop_port)) { 46610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n", 4679716SN/A snoop_port->name(), pkt->cmdString(), pkt->getAddr()); 4689716SN/A return false; 4699716SN/A } 4708975SN/A } 4718975SN/A 47210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x\n", 4738975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 4748975SN/A 4759712SN/A // store size and command as they might be modified when 4769712SN/A // forwarding the packet 4779712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 4789712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 4799712SN/A 4808975SN/A // responses are never express snoops 4818975SN/A assert(!pkt->isExpressSnoop()); 4828975SN/A 48310719SMarco.Balboni@ARM.com // a snoop response sees the snoop response latency, and if it is 48410719SMarco.Balboni@ARM.com // forwarded as a normal response, the response latency 48510719SMarco.Balboni@ARM.com Tick xbar_delay = 48610719SMarco.Balboni@ARM.com (forwardAsSnoop ? snoopResponseLatency : responseLatency) * 48710719SMarco.Balboni@ARM.com clockPeriod(); 48810719SMarco.Balboni@ARM.com 48910719SMarco.Balboni@ARM.com // set the packet header and payload delay 49010719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 49110719SMarco.Balboni@ARM.com 49210719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 49310719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 4948975SN/A 4959714SN/A // forward it either as a snoop response or a normal response 4969714SN/A if (forwardAsSnoop) { 4979714SN/A // this is a snoop response to a snoop request we forwarded, 4989714SN/A // e.g. coming from the L1 and going to the L2, and it should 4999714SN/A // be forwarded as a snoop response 50010402SN/A 50110402SN/A if (snoopFilter) { 50210402SN/A // update the probe filter so that it can properly track the line 50310402SN/A snoopFilter->updateSnoopForward(pkt, *slavePorts[slave_port_id], 50410402SN/A *masterPorts[dest_port_id]); 50510402SN/A } 50610402SN/A 5079712SN/A bool success M5_VAR_USED = 5089712SN/A masterPorts[dest_port_id]->sendTimingSnoopResp(pkt); 5099712SN/A pktCount[slave_port_id][dest_port_id]++; 51010405Sandreas.hansson@arm.com pktSize[slave_port_id][dest_port_id] += pkt_size; 5118975SN/A assert(success); 5129714SN/A 5139715SN/A snoopLayers[dest_port_id]->succeededTiming(packetFinishTime); 5143244SN/A } else { 5158975SN/A // we got a snoop response on one of our slave ports, 51610405Sandreas.hansson@arm.com // i.e. from a coherent master connected to the crossbar, and 51710405Sandreas.hansson@arm.com // since we created the snoop request as part of recvTiming, 51810405Sandreas.hansson@arm.com // this should now be a normal response again 51910656Sandreas.hansson@arm.com outstandingSnoop.erase(pkt->req); 5208948SN/A 52110656Sandreas.hansson@arm.com // this is a snoop response from a coherent master, hence it 52210656Sandreas.hansson@arm.com // should never go back to where the snoop response came from, 52310656Sandreas.hansson@arm.com // but instead to where the original request came from 5249712SN/A assert(slave_port_id != dest_port_id); 5258948SN/A 52610402SN/A if (snoopFilter) { 52710402SN/A // update the probe filter so that it can properly track the line 52810402SN/A snoopFilter->updateSnoopResponse(pkt, *slavePorts[slave_port_id], 52910402SN/A *slavePorts[dest_port_id]); 53010402SN/A } 53110402SN/A 53210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x"\ 53310402SN/A " FWD RESP\n", src_port->name(), pkt->cmdString(), 53410402SN/A pkt->getAddr()); 53510402SN/A 5369714SN/A // as a normal response, it should go back to a master through 53710888Sandreas.hansson@arm.com // one of our slave ports, we also pay for any outstanding 53810888Sandreas.hansson@arm.com // header latency 53910888Sandreas.hansson@arm.com Tick latency = pkt->headerDelay; 54010888Sandreas.hansson@arm.com pkt->headerDelay = 0; 54110888Sandreas.hansson@arm.com slavePorts[dest_port_id]->schedTimingResp(pkt, curTick() + latency); 5429716SN/A 5439716SN/A respLayers[dest_port_id]->succeededTiming(packetFinishTime); 5443244SN/A } 5453244SN/A 54610656Sandreas.hansson@arm.com // remove the request from the routing table 54710656Sandreas.hansson@arm.com routeTo.erase(route_lookup); 54810656Sandreas.hansson@arm.com 5499712SN/A // stats updates 5509712SN/A transDist[pkt_cmd]++; 55110405Sandreas.hansson@arm.com snoops++; 5529712SN/A 5538948SN/A return true; 5548948SN/A} 5558948SN/A 5563210SN/A 5578948SN/Avoid 55810405Sandreas.hansson@arm.comCoherentXBar::forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id, 55910888Sandreas.hansson@arm.com const std::vector<QueuedSlavePort*>& dests) 5608948SN/A{ 56110405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s for %s address %x size %d\n", __func__, 5629663SN/A pkt->cmdString(), pkt->getAddr(), pkt->getSize()); 5639663SN/A 5649524SN/A // snoops should only happen if the system isn't bypassing caches 5659524SN/A assert(!system->bypassCaches()); 5669524SN/A 56710401SN/A unsigned fanout = 0; 56810401SN/A 56910405Sandreas.hansson@arm.com for (const auto& p: dests) { 5708948SN/A // we could have gotten this request from a snooping master 5718948SN/A // (corresponding to our own slave port that is also in 5728948SN/A // snoopPorts) and should not send it back to where it came 5738948SN/A // from 5749031SN/A if (exclude_slave_port_id == InvalidPortID || 5758948SN/A p->getId() != exclude_slave_port_id) { 5768948SN/A // cache is not allowed to refuse snoop 5778975SN/A p->sendTimingSnoopReq(pkt); 57810401SN/A fanout++; 5798948SN/A } 5808948SN/A } 58110401SN/A 58210401SN/A // Stats for fanout of this forward operation 58310401SN/A snoopFanout.sample(fanout); 5842497SN/A} 5852497SN/A 5869092SN/Avoid 58710713Sandreas.hansson@arm.comCoherentXBar::recvReqRetry(PortID master_port_id) 5889092SN/A{ 5899093SN/A // responses and snoop responses never block on forwarding them, 5909093SN/A // so the retry will always be coming from a port to which we 5919093SN/A // tried to forward a request 5929715SN/A reqLayers[master_port_id]->recvRetry(); 5939092SN/A} 5949092SN/A 5959036SN/ATick 59610405Sandreas.hansson@arm.comCoherentXBar::recvAtomic(PacketPtr pkt, PortID slave_port_id) 5972657SN/A{ 59810405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvAtomic: packet src %s addr 0x%x cmd %s\n", 5999032SN/A slavePorts[slave_port_id]->name(), pkt->getAddr(), 6008949SN/A pkt->cmdString()); 6018915SN/A 60210405Sandreas.hansson@arm.com unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 60310405Sandreas.hansson@arm.com unsigned int pkt_cmd = pkt->cmdToIndex(); 6049712SN/A 6058979SN/A MemCmd snoop_response_cmd = MemCmd::InvalidCmd; 6068979SN/A Tick snoop_response_latency = 0; 6078979SN/A 60810821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 6098979SN/A // forward to all snoopers but the source 61010402SN/A std::pair<MemCmd, Tick> snoop_result; 61110402SN/A if (snoopFilter) { 61210402SN/A // check with the snoop filter where to forward this packet 61310402SN/A auto sf_res = 61410402SN/A snoopFilter->lookupRequest(pkt, *slavePorts[slave_port_id]); 61510402SN/A snoop_response_latency += sf_res.second * clockPeriod(); 61610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s: src %s %s 0x%x"\ 61710402SN/A " SF size: %i lat: %i\n", __func__, 61810402SN/A slavePorts[slave_port_id]->name(), pkt->cmdString(), 61910402SN/A pkt->getAddr(), sf_res.first.size(), sf_res.second); 62010402SN/A snoop_result = forwardAtomic(pkt, slave_port_id, InvalidPortID, 62110402SN/A sf_res.first); 62210402SN/A } else { 62310402SN/A snoop_result = forwardAtomic(pkt, slave_port_id); 62410402SN/A } 6258979SN/A snoop_response_cmd = snoop_result.first; 62610402SN/A snoop_response_latency += snoop_result.second; 6278979SN/A } 6288915SN/A 6298948SN/A // even if we had a snoop response, we must continue and also 6308948SN/A // perform the actual request at the destination 63110405Sandreas.hansson@arm.com PortID master_port_id = findPort(pkt->getAddr()); 63210405Sandreas.hansson@arm.com 63310405Sandreas.hansson@arm.com // stats updates for the request 63410405Sandreas.hansson@arm.com pktCount[slave_port_id][master_port_id]++; 63510405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 63610405Sandreas.hansson@arm.com transDist[pkt_cmd]++; 6378948SN/A 6388948SN/A // forward the request to the appropriate destination 63910405Sandreas.hansson@arm.com Tick response_latency = masterPorts[master_port_id]->sendAtomic(pkt); 6408948SN/A 64110402SN/A // Lower levels have replied, tell the snoop filter 64210821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches() && pkt->isResponse()) { 64310402SN/A snoopFilter->updateResponse(pkt, *slavePorts[slave_port_id]); 64410402SN/A } 64510402SN/A 6468948SN/A // if we got a response from a snooper, restore it here 6478948SN/A if (snoop_response_cmd != MemCmd::InvalidCmd) { 6488948SN/A // no one else should have responded 6498948SN/A assert(!pkt->isResponse()); 6508948SN/A pkt->cmd = snoop_response_cmd; 6518948SN/A response_latency = snoop_response_latency; 6528948SN/A } 6538948SN/A 6549712SN/A // add the response data 65510405Sandreas.hansson@arm.com if (pkt->isResponse()) { 65610405Sandreas.hansson@arm.com pkt_size = pkt->hasData() ? pkt->getSize() : 0; 65710405Sandreas.hansson@arm.com pkt_cmd = pkt->cmdToIndex(); 65810405Sandreas.hansson@arm.com 65910405Sandreas.hansson@arm.com // stats updates 66010405Sandreas.hansson@arm.com pktCount[slave_port_id][master_port_id]++; 66110405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 66210405Sandreas.hansson@arm.com transDist[pkt_cmd]++; 66310405Sandreas.hansson@arm.com } 6649712SN/A 66510694SMarco.Balboni@ARM.com // @todo: Not setting header time 66610694SMarco.Balboni@ARM.com pkt->payloadDelay = response_latency; 6678948SN/A return response_latency; 6688948SN/A} 6698948SN/A 6708948SN/ATick 67110405Sandreas.hansson@arm.comCoherentXBar::recvAtomicSnoop(PacketPtr pkt, PortID master_port_id) 6728948SN/A{ 67310405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvAtomicSnoop: packet src %s addr 0x%x cmd %s\n", 6749032SN/A masterPorts[master_port_id]->name(), pkt->getAddr(), 6758949SN/A pkt->cmdString()); 6768948SN/A 6779712SN/A // add the request snoop data 67810405Sandreas.hansson@arm.com snoops++; 6799712SN/A 6808948SN/A // forward to all snoopers 68110402SN/A std::pair<MemCmd, Tick> snoop_result; 68210402SN/A Tick snoop_response_latency = 0; 68310402SN/A if (snoopFilter) { 68410402SN/A auto sf_res = snoopFilter->lookupSnoop(pkt); 68510402SN/A snoop_response_latency += sf_res.second * clockPeriod(); 68610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s: src %s %s 0x%x SF size: %i lat: %i\n", 68710402SN/A __func__, masterPorts[master_port_id]->name(), pkt->cmdString(), 68810402SN/A pkt->getAddr(), sf_res.first.size(), sf_res.second); 68910402SN/A snoop_result = forwardAtomic(pkt, InvalidPortID, master_port_id, 69010402SN/A sf_res.first); 69110402SN/A } else { 69210402SN/A snoop_result = forwardAtomic(pkt, InvalidPortID); 69310402SN/A } 6948948SN/A MemCmd snoop_response_cmd = snoop_result.first; 69510402SN/A snoop_response_latency += snoop_result.second; 6968948SN/A 6978948SN/A if (snoop_response_cmd != MemCmd::InvalidCmd) 6988948SN/A pkt->cmd = snoop_response_cmd; 6998948SN/A 7009712SN/A // add the response snoop data 70110401SN/A if (pkt->isResponse()) { 70210405Sandreas.hansson@arm.com snoops++; 70310401SN/A } 7049712SN/A 70510694SMarco.Balboni@ARM.com // @todo: Not setting header time 70610694SMarco.Balboni@ARM.com pkt->payloadDelay = snoop_response_latency; 7078948SN/A return snoop_response_latency; 7088948SN/A} 7098948SN/A 7108948SN/Astd::pair<MemCmd, Tick> 71110405Sandreas.hansson@arm.comCoherentXBar::forwardAtomic(PacketPtr pkt, PortID exclude_slave_port_id, 71210402SN/A PortID source_master_port_id, 71310888Sandreas.hansson@arm.com const std::vector<QueuedSlavePort*>& dests) 7148948SN/A{ 7159032SN/A // the packet may be changed on snoops, record the original 7169032SN/A // command to enable us to restore it between snoops so that 7178948SN/A // additional snoops can take place properly 7184626SN/A MemCmd orig_cmd = pkt->cmd; 7194879SN/A MemCmd snoop_response_cmd = MemCmd::InvalidCmd; 7204879SN/A Tick snoop_response_latency = 0; 7213662SN/A 7229524SN/A // snoops should only happen if the system isn't bypassing caches 7239524SN/A assert(!system->bypassCaches()); 7249524SN/A 72510401SN/A unsigned fanout = 0; 72610401SN/A 72710405Sandreas.hansson@arm.com for (const auto& p: dests) { 7288915SN/A // we could have gotten this request from a snooping master 7298915SN/A // (corresponding to our own slave port that is also in 7308915SN/A // snoopPorts) and should not send it back to where it came 7318915SN/A // from 73210402SN/A if (exclude_slave_port_id != InvalidPortID && 73310402SN/A p->getId() == exclude_slave_port_id) 73410402SN/A continue; 73510401SN/A 73610402SN/A Tick latency = p->sendAtomicSnoop(pkt); 73710402SN/A fanout++; 73810402SN/A 73910402SN/A // in contrast to a functional access, we have to keep on 74010402SN/A // going as all snoopers must be updated even if we get a 74110402SN/A // response 74210402SN/A if (!pkt->isResponse()) 74310402SN/A continue; 74410402SN/A 74510402SN/A // response from snoop agent 74610402SN/A assert(pkt->cmd != orig_cmd); 74710402SN/A assert(pkt->memInhibitAsserted()); 74810402SN/A // should only happen once 74910402SN/A assert(snoop_response_cmd == MemCmd::InvalidCmd); 75010402SN/A // save response state 75110402SN/A snoop_response_cmd = pkt->cmd; 75210402SN/A snoop_response_latency = latency; 75310402SN/A 75410402SN/A if (snoopFilter) { 75510402SN/A // Handle responses by the snoopers and differentiate between 75610402SN/A // responses to requests from above and snoops from below 75710402SN/A if (source_master_port_id != InvalidPortID) { 75810402SN/A // Getting a response for a snoop from below 75910402SN/A assert(exclude_slave_port_id == InvalidPortID); 76010402SN/A snoopFilter->updateSnoopForward(pkt, *p, 76110402SN/A *masterPorts[source_master_port_id]); 76210402SN/A } else { 76310402SN/A // Getting a response for a request from above 76410402SN/A assert(source_master_port_id == InvalidPortID); 76510402SN/A snoopFilter->updateSnoopResponse(pkt, *p, 76610402SN/A *slavePorts[exclude_slave_port_id]); 7674626SN/A } 7684626SN/A } 76910402SN/A // restore original packet state for remaining snoopers 77010402SN/A pkt->cmd = orig_cmd; 7714626SN/A } 7724626SN/A 77310401SN/A // Stats for fanout 77410401SN/A snoopFanout.sample(fanout); 77510401SN/A 7768948SN/A // the packet is restored as part of the loop and any potential 7778948SN/A // snoop response is part of the returned pair 7788948SN/A return std::make_pair(snoop_response_cmd, snoop_response_latency); 7792497SN/A} 7802497SN/A 7812497SN/Avoid 78210405Sandreas.hansson@arm.comCoherentXBar::recvFunctional(PacketPtr pkt, PortID slave_port_id) 7832497SN/A{ 7848663SN/A if (!pkt->isPrint()) { 7858663SN/A // don't do DPRINTFs on PrintReq as it clutters up the output 78610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, 7878949SN/A "recvFunctional: packet src %s addr 0x%x cmd %s\n", 7889032SN/A slavePorts[slave_port_id]->name(), pkt->getAddr(), 7898663SN/A pkt->cmdString()); 7908663SN/A } 7918663SN/A 79210821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 7938979SN/A // forward to all snoopers but the source 7949032SN/A forwardFunctional(pkt, slave_port_id); 7958979SN/A } 7964912SN/A 7978948SN/A // there is no need to continue if the snooping has found what we 7988948SN/A // were looking for and the packet is already a response 7998948SN/A if (!pkt->isResponse()) { 80010888Sandreas.hansson@arm.com // since our slave ports are queued ports we need to check them as well 80110888Sandreas.hansson@arm.com for (const auto& p : slavePorts) { 80210888Sandreas.hansson@arm.com // if we find a response that has the data, then the 80310888Sandreas.hansson@arm.com // downstream caches/memories may be out of date, so simply stop 80410888Sandreas.hansson@arm.com // here 80510888Sandreas.hansson@arm.com if (p->checkFunctional(pkt)) { 80610888Sandreas.hansson@arm.com if (pkt->needsResponse()) 80710888Sandreas.hansson@arm.com pkt->makeResponse(); 80810888Sandreas.hansson@arm.com return; 80910888Sandreas.hansson@arm.com } 81010888Sandreas.hansson@arm.com } 81110888Sandreas.hansson@arm.com 8129031SN/A PortID dest_id = findPort(pkt->getAddr()); 8138948SN/A 8148948SN/A masterPorts[dest_id]->sendFunctional(pkt); 8158948SN/A } 8168948SN/A} 8178948SN/A 8188948SN/Avoid 81910405Sandreas.hansson@arm.comCoherentXBar::recvFunctionalSnoop(PacketPtr pkt, PortID master_port_id) 8208948SN/A{ 8218948SN/A if (!pkt->isPrint()) { 8228948SN/A // don't do DPRINTFs on PrintReq as it clutters up the output 82310405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, 8248949SN/A "recvFunctionalSnoop: packet src %s addr 0x%x cmd %s\n", 8259032SN/A masterPorts[master_port_id]->name(), pkt->getAddr(), 8268948SN/A pkt->cmdString()); 8278948SN/A } 8288948SN/A 8298948SN/A // forward to all snoopers 8309031SN/A forwardFunctional(pkt, InvalidPortID); 8318948SN/A} 8328948SN/A 8338948SN/Avoid 83410405Sandreas.hansson@arm.comCoherentXBar::forwardFunctional(PacketPtr pkt, PortID exclude_slave_port_id) 8358948SN/A{ 8369524SN/A // snoops should only happen if the system isn't bypassing caches 8379524SN/A assert(!system->bypassCaches()); 8389524SN/A 83910405Sandreas.hansson@arm.com for (const auto& p: snoopPorts) { 8408915SN/A // we could have gotten this request from a snooping master 8418915SN/A // (corresponding to our own slave port that is also in 8428915SN/A // snoopPorts) and should not send it back to where it came 8438915SN/A // from 8449031SN/A if (exclude_slave_port_id == InvalidPortID || 8458948SN/A p->getId() != exclude_slave_port_id) 8468948SN/A p->sendFunctionalSnoop(pkt); 8478915SN/A 8488948SN/A // if we get a response we are done 8498948SN/A if (pkt->isResponse()) { 8508948SN/A break; 8518915SN/A } 8523650SN/A } 8532497SN/A} 8542497SN/A 8559712SN/Avoid 85610405Sandreas.hansson@arm.comCoherentXBar::regStats() 8579712SN/A{ 85810405Sandreas.hansson@arm.com // register the stats of the base class and our layers 85910405Sandreas.hansson@arm.com BaseXBar::regStats(); 86010405Sandreas.hansson@arm.com for (auto l: reqLayers) 86110405Sandreas.hansson@arm.com l->regStats(); 86210405Sandreas.hansson@arm.com for (auto l: respLayers) 86310405Sandreas.hansson@arm.com l->regStats(); 86410405Sandreas.hansson@arm.com for (auto l: snoopLayers) 86510405Sandreas.hansson@arm.com l->regStats(); 8669712SN/A 86710405Sandreas.hansson@arm.com snoops 86810405Sandreas.hansson@arm.com .name(name() + ".snoops") 86910401SN/A .desc("Total snoops (count)") 87010401SN/A ; 87110401SN/A 87210401SN/A snoopFanout 87310401SN/A .init(0, snoopPorts.size(), 1) 87410401SN/A .name(name() + ".snoop_fanout") 87510401SN/A .desc("Request fanout histogram") 87610401SN/A ; 8779712SN/A} 8789712SN/A 87910405Sandreas.hansson@arm.comCoherentXBar * 88010405Sandreas.hansson@arm.comCoherentXBarParams::create() 8812497SN/A{ 88210405Sandreas.hansson@arm.com return new CoherentXBar(this); 8832497SN/A} 884