coherent_xbar.cc revision 11126
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()) { 1908979SN/A // the packet is a memory-mapped request and should be 1918979SN/A // broadcasted to our snoopers but the source 19210402SN/A if (snoopFilter) { 19310402SN/A // check with the snoop filter where to forward this packet 19410402SN/A auto sf_res = snoopFilter->lookupRequest(pkt, *src_port); 19511126Sandreas.hansson@arm.com // the time required by a packet to be delivered through 19611126Sandreas.hansson@arm.com // the xbar has to be charged also with to lookup latency 19711126Sandreas.hansson@arm.com // of the snoop filter 19810719SMarco.Balboni@ARM.com pkt->headerDelay += sf_res.second * clockPeriod(); 19910405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x"\ 20010402SN/A " SF size: %i lat: %i\n", src_port->name(), 20110402SN/A pkt->cmdString(), pkt->getAddr(), sf_res.first.size(), 20210402SN/A sf_res.second); 20310402SN/A forwardTiming(pkt, slave_port_id, sf_res.first); 20410402SN/A } else { 20510402SN/A forwardTiming(pkt, slave_port_id); 20610402SN/A } 2078979SN/A } 2088948SN/A 20910883Sali.jafri@arm.com // forwardTiming snooped into peer caches of the sender, and if 21010883Sali.jafri@arm.com // this is a clean evict, but the packet is found in a cache, do 21110883Sali.jafri@arm.com // not forward it 21210883Sali.jafri@arm.com if (pkt->cmd == MemCmd::CleanEvict && pkt->isBlockCached()) { 21310883Sali.jafri@arm.com DPRINTF(CoherentXBar, "recvTimingReq: Clean evict 0x%x still cached, " 21410883Sali.jafri@arm.com "not forwarding\n", pkt->getAddr()); 21510883Sali.jafri@arm.com 21610883Sali.jafri@arm.com // update the layer state and schedule an idle event 21710883Sali.jafri@arm.com reqLayers[master_port_id]->succeededTiming(packetFinishTime); 21810883Sali.jafri@arm.com pendingDelete.push_back(pkt); 21910883Sali.jafri@arm.com return true; 22010883Sali.jafri@arm.com } 22110883Sali.jafri@arm.com 22210656Sandreas.hansson@arm.com // remember if the packet will generate a snoop response 22310656Sandreas.hansson@arm.com const bool expect_snoop_resp = !is_inhibited && pkt->memInhibitAsserted(); 22410656Sandreas.hansson@arm.com const bool expect_response = pkt->needsResponse() && 22510656Sandreas.hansson@arm.com !pkt->memInhibitAsserted(); 2268915SN/A 22710402SN/A // Note: Cannot create a copy of the full packet, here. 22810402SN/A MemCmd orig_cmd(pkt->cmd); 22910402SN/A 2309612SN/A // since it is a normal request, attempt to send the packet 2319712SN/A bool success = masterPorts[master_port_id]->sendTimingReq(pkt); 2328948SN/A 23310821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches()) { 23410402SN/A // The packet may already be overwritten by the sendTimingReq function. 23510402SN/A // The snoop filter needs to see the original request *and* the return 23610402SN/A // status of the send operation, so we need to recreate the original 23710402SN/A // request. Atomic mode does not have the issue, as there the send 23810402SN/A // operation and the response happen instantaneously and don't need two 23910402SN/A // phase tracking. 24010402SN/A MemCmd tmp_cmd(pkt->cmd); 24110402SN/A pkt->cmd = orig_cmd; 24210402SN/A // Let the snoop filter know about the success of the send operation 24310402SN/A snoopFilter->updateRequest(pkt, *src_port, !success); 24410402SN/A pkt->cmd = tmp_cmd; 24510402SN/A } 24610402SN/A 24710656Sandreas.hansson@arm.com // check if we were successful in sending the packet onwards 24810656Sandreas.hansson@arm.com if (!success) { 24910656Sandreas.hansson@arm.com // express snoops and inhibited packets should never be forced 25010656Sandreas.hansson@arm.com // to retry 25110656Sandreas.hansson@arm.com assert(!is_express_snoop); 25210656Sandreas.hansson@arm.com assert(!pkt->memInhibitAsserted()); 25310656Sandreas.hansson@arm.com 25410719SMarco.Balboni@ARM.com // restore the header delay 25510719SMarco.Balboni@ARM.com pkt->headerDelay = old_header_delay; 25610656Sandreas.hansson@arm.com 25710656Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x RETRY\n", 25810656Sandreas.hansson@arm.com src_port->name(), pkt->cmdString(), pkt->getAddr()); 25910656Sandreas.hansson@arm.com 26010656Sandreas.hansson@arm.com // update the layer state and schedule an idle event 26110656Sandreas.hansson@arm.com reqLayers[master_port_id]->failedTiming(src_port, 26210719SMarco.Balboni@ARM.com clockEdge(Cycles(1))); 2639091SN/A } else { 26410656Sandreas.hansson@arm.com // express snoops currently bypass the crossbar state entirely 26510656Sandreas.hansson@arm.com if (!is_express_snoop) { 26610656Sandreas.hansson@arm.com // if this particular request will generate a snoop 26710656Sandreas.hansson@arm.com // response 26810656Sandreas.hansson@arm.com if (expect_snoop_resp) { 26910656Sandreas.hansson@arm.com // we should never have an exsiting request outstanding 27010656Sandreas.hansson@arm.com assert(outstandingSnoop.find(pkt->req) == 27110656Sandreas.hansson@arm.com outstandingSnoop.end()); 27210656Sandreas.hansson@arm.com outstandingSnoop.insert(pkt->req); 2738948SN/A 27410656Sandreas.hansson@arm.com // basic sanity check on the outstanding snoops 27510656Sandreas.hansson@arm.com panic_if(outstandingSnoop.size() > 512, 27610656Sandreas.hansson@arm.com "Outstanding snoop requests exceeded 512\n"); 27710656Sandreas.hansson@arm.com } 2788948SN/A 27910656Sandreas.hansson@arm.com // remember where to route the normal response to 28010656Sandreas.hansson@arm.com if (expect_response || expect_snoop_resp) { 28110656Sandreas.hansson@arm.com assert(routeTo.find(pkt->req) == routeTo.end()); 28210656Sandreas.hansson@arm.com routeTo[pkt->req] = slave_port_id; 2839549SN/A 28410656Sandreas.hansson@arm.com panic_if(routeTo.size() > 512, 28510656Sandreas.hansson@arm.com "Routing table exceeds 512 packets\n"); 28610656Sandreas.hansson@arm.com } 2878948SN/A 28810405Sandreas.hansson@arm.com // update the layer state and schedule an idle event 2899715SN/A reqLayers[master_port_id]->succeededTiming(packetFinishTime); 2909091SN/A } 2918975SN/A 29210656Sandreas.hansson@arm.com // stats updates only consider packets that were successfully sent 2939712SN/A pktCount[slave_port_id][master_port_id]++; 29410405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 2959712SN/A transDist[pkt_cmd]++; 29610656Sandreas.hansson@arm.com 29710656Sandreas.hansson@arm.com if (is_express_snoop) 29810656Sandreas.hansson@arm.com snoops++; 2999712SN/A } 3009712SN/A 3019091SN/A return success; 3028975SN/A} 3038975SN/A 3048975SN/Abool 30510405Sandreas.hansson@arm.comCoherentXBar::recvTimingResp(PacketPtr pkt, PortID master_port_id) 3068975SN/A{ 3078975SN/A // determine the source port based on the id 3089032SN/A MasterPort *src_port = masterPorts[master_port_id]; 3098975SN/A 31010656Sandreas.hansson@arm.com // determine the destination 31110656Sandreas.hansson@arm.com const auto route_lookup = routeTo.find(pkt->req); 31210656Sandreas.hansson@arm.com assert(route_lookup != routeTo.end()); 31310656Sandreas.hansson@arm.com const PortID slave_port_id = route_lookup->second; 31410572Sandreas.hansson@arm.com assert(slave_port_id != InvalidPortID); 31510572Sandreas.hansson@arm.com assert(slave_port_id < respLayers.size()); 3169713SN/A 31710405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the 31810405Sandreas.hansson@arm.com // current port 3199715SN/A if (!respLayers[slave_port_id]->tryTiming(src_port)) { 32010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingResp: src %s %s 0x%x BUSY\n", 3218975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 3228975SN/A return false; 3238975SN/A } 3248975SN/A 32510405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingResp: src %s %s 0x%x\n", 3268975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 3278975SN/A 3289712SN/A // store size and command as they might be modified when 3299712SN/A // forwarding the packet 3309712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 3319712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 3329712SN/A 33310719SMarco.Balboni@ARM.com // a response sees the response latency 33410719SMarco.Balboni@ARM.com Tick xbar_delay = responseLatency * clockPeriod(); 33510719SMarco.Balboni@ARM.com 33610719SMarco.Balboni@ARM.com // set the packet header and payload delay 33710719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 33810719SMarco.Balboni@ARM.com 33910719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 34010719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 3418975SN/A 34210821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches()) { 34310402SN/A // let the snoop filter inspect the response and update its state 34410402SN/A snoopFilter->updateResponse(pkt, *slavePorts[slave_port_id]); 34510402SN/A } 34610402SN/A 34710888Sandreas.hansson@arm.com // send the packet through the destination slave port and pay for 34810888Sandreas.hansson@arm.com // any outstanding header delay 34910888Sandreas.hansson@arm.com Tick latency = pkt->headerDelay; 35010888Sandreas.hansson@arm.com pkt->headerDelay = 0; 35110888Sandreas.hansson@arm.com slavePorts[slave_port_id]->schedTimingResp(pkt, curTick() + latency); 3528975SN/A 35310656Sandreas.hansson@arm.com // remove the request from the routing table 35410656Sandreas.hansson@arm.com routeTo.erase(route_lookup); 35510656Sandreas.hansson@arm.com 3569715SN/A respLayers[slave_port_id]->succeededTiming(packetFinishTime); 3578975SN/A 3589712SN/A // stats updates 3599712SN/A pktCount[slave_port_id][master_port_id]++; 36010405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 3619712SN/A transDist[pkt_cmd]++; 3629712SN/A 3638975SN/A return true; 3648975SN/A} 3658975SN/A 3668975SN/Avoid 36710405Sandreas.hansson@arm.comCoherentXBar::recvTimingSnoopReq(PacketPtr pkt, PortID master_port_id) 3688975SN/A{ 36910405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopReq: src %s %s 0x%x\n", 3709032SN/A masterPorts[master_port_id]->name(), pkt->cmdString(), 3718975SN/A pkt->getAddr()); 3728975SN/A 3739712SN/A // update stats here as we know the forwarding will succeed 3749712SN/A transDist[pkt->cmdToIndex()]++; 37510405Sandreas.hansson@arm.com snoops++; 3769712SN/A 3778975SN/A // we should only see express snoops from caches 3788975SN/A assert(pkt->isExpressSnoop()); 3798975SN/A 38010656Sandreas.hansson@arm.com // remeber if the packet is inhibited so we can see if it changes 38110656Sandreas.hansson@arm.com const bool is_inhibited = pkt->memInhibitAsserted(); 3829032SN/A 38310402SN/A if (snoopFilter) { 38410402SN/A // let the Snoop Filter work its magic and guide probing 38510402SN/A auto sf_res = snoopFilter->lookupSnoop(pkt); 38611126Sandreas.hansson@arm.com // the time required by a packet to be delivered through 38711126Sandreas.hansson@arm.com // the xbar has to be charged also with to lookup latency 38811126Sandreas.hansson@arm.com // of the snoop filter 38911126Sandreas.hansson@arm.com pkt->headerDelay += sf_res.second * clockPeriod(); 39010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopReq: src %s %s 0x%x"\ 39110402SN/A " SF size: %i lat: %i\n", masterPorts[master_port_id]->name(), 39210402SN/A pkt->cmdString(), pkt->getAddr(), sf_res.first.size(), 39310402SN/A sf_res.second); 39410402SN/A 39510402SN/A // forward to all snoopers 39610402SN/A forwardTiming(pkt, InvalidPortID, sf_res.first); 39710402SN/A } else { 39810402SN/A forwardTiming(pkt, InvalidPortID); 39910402SN/A } 4008975SN/A 40110656Sandreas.hansson@arm.com // if we can expect a response, remember how to route it 40210656Sandreas.hansson@arm.com if (!is_inhibited && pkt->memInhibitAsserted()) { 40310656Sandreas.hansson@arm.com assert(routeTo.find(pkt->req) == routeTo.end()); 40410656Sandreas.hansson@arm.com routeTo[pkt->req] = master_port_id; 40510656Sandreas.hansson@arm.com } 40610656Sandreas.hansson@arm.com 4078975SN/A // a snoop request came from a connected slave device (one of 4088975SN/A // our master ports), and if it is not coming from the slave 4098975SN/A // device responsible for the address range something is 4108975SN/A // wrong, hence there is nothing further to do as the packet 4118975SN/A // would be going back to where it came from 4129032SN/A assert(master_port_id == findPort(pkt->getAddr())); 4138975SN/A} 4148975SN/A 4158975SN/Abool 41610405Sandreas.hansson@arm.comCoherentXBar::recvTimingSnoopResp(PacketPtr pkt, PortID slave_port_id) 4178975SN/A{ 4188975SN/A // determine the source port based on the id 4199032SN/A SlavePort* src_port = slavePorts[slave_port_id]; 4208975SN/A 42110656Sandreas.hansson@arm.com // get the destination 42210656Sandreas.hansson@arm.com const auto route_lookup = routeTo.find(pkt->req); 42310656Sandreas.hansson@arm.com assert(route_lookup != routeTo.end()); 42410656Sandreas.hansson@arm.com const PortID dest_port_id = route_lookup->second; 42510572Sandreas.hansson@arm.com assert(dest_port_id != InvalidPortID); 4269714SN/A 4279714SN/A // determine if the response is from a snoop request we 4289714SN/A // created as the result of a normal request (in which case it 42910656Sandreas.hansson@arm.com // should be in the outstandingSnoop), or if we merely forwarded 4309714SN/A // someone else's snoop request 43110656Sandreas.hansson@arm.com const bool forwardAsSnoop = outstandingSnoop.find(pkt->req) == 43210656Sandreas.hansson@arm.com outstandingSnoop.end(); 4339714SN/A 43410405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the 43510405Sandreas.hansson@arm.com // current port, note that the check is bypassed if the response 43610405Sandreas.hansson@arm.com // is being passed on as a normal response since this is occupying 43710405Sandreas.hansson@arm.com // the response layer rather than the snoop response layer 4389715SN/A if (forwardAsSnoop) { 43910572Sandreas.hansson@arm.com assert(dest_port_id < snoopLayers.size()); 4409715SN/A if (!snoopLayers[dest_port_id]->tryTiming(src_port)) { 44110405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n", 4429715SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 4439715SN/A return false; 4449715SN/A } 4459716SN/A } else { 4469716SN/A // get the master port that mirrors this slave port internally 4479716SN/A MasterPort* snoop_port = snoopRespPorts[slave_port_id]; 44810572Sandreas.hansson@arm.com assert(dest_port_id < respLayers.size()); 4499716SN/A if (!respLayers[dest_port_id]->tryTiming(snoop_port)) { 45010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n", 4519716SN/A snoop_port->name(), pkt->cmdString(), pkt->getAddr()); 4529716SN/A return false; 4539716SN/A } 4548975SN/A } 4558975SN/A 45610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x\n", 4578975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 4588975SN/A 4599712SN/A // store size and command as they might be modified when 4609712SN/A // forwarding the packet 4619712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 4629712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 4639712SN/A 4648975SN/A // responses are never express snoops 4658975SN/A assert(!pkt->isExpressSnoop()); 4668975SN/A 46710719SMarco.Balboni@ARM.com // a snoop response sees the snoop response latency, and if it is 46810719SMarco.Balboni@ARM.com // forwarded as a normal response, the response latency 46910719SMarco.Balboni@ARM.com Tick xbar_delay = 47010719SMarco.Balboni@ARM.com (forwardAsSnoop ? snoopResponseLatency : responseLatency) * 47110719SMarco.Balboni@ARM.com clockPeriod(); 47210719SMarco.Balboni@ARM.com 47310719SMarco.Balboni@ARM.com // set the packet header and payload delay 47410719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 47510719SMarco.Balboni@ARM.com 47610719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 47710719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 4788975SN/A 4799714SN/A // forward it either as a snoop response or a normal response 4809714SN/A if (forwardAsSnoop) { 4819714SN/A // this is a snoop response to a snoop request we forwarded, 4829714SN/A // e.g. coming from the L1 and going to the L2, and it should 4839714SN/A // be forwarded as a snoop response 48410402SN/A 48510402SN/A if (snoopFilter) { 48610402SN/A // update the probe filter so that it can properly track the line 48710402SN/A snoopFilter->updateSnoopForward(pkt, *slavePorts[slave_port_id], 48810402SN/A *masterPorts[dest_port_id]); 48910402SN/A } 49010402SN/A 4919712SN/A bool success M5_VAR_USED = 4929712SN/A masterPorts[dest_port_id]->sendTimingSnoopResp(pkt); 4939712SN/A pktCount[slave_port_id][dest_port_id]++; 49410405Sandreas.hansson@arm.com pktSize[slave_port_id][dest_port_id] += pkt_size; 4958975SN/A assert(success); 4969714SN/A 4979715SN/A snoopLayers[dest_port_id]->succeededTiming(packetFinishTime); 4983244SN/A } else { 4998975SN/A // we got a snoop response on one of our slave ports, 50010405Sandreas.hansson@arm.com // i.e. from a coherent master connected to the crossbar, and 50110405Sandreas.hansson@arm.com // since we created the snoop request as part of recvTiming, 50210405Sandreas.hansson@arm.com // this should now be a normal response again 50310656Sandreas.hansson@arm.com outstandingSnoop.erase(pkt->req); 5048948SN/A 50510656Sandreas.hansson@arm.com // this is a snoop response from a coherent master, hence it 50610656Sandreas.hansson@arm.com // should never go back to where the snoop response came from, 50710656Sandreas.hansson@arm.com // but instead to where the original request came from 5089712SN/A assert(slave_port_id != dest_port_id); 5098948SN/A 51010402SN/A if (snoopFilter) { 51110402SN/A // update the probe filter so that it can properly track the line 51210402SN/A snoopFilter->updateSnoopResponse(pkt, *slavePorts[slave_port_id], 51310402SN/A *slavePorts[dest_port_id]); 51410402SN/A } 51510402SN/A 51610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x"\ 51710402SN/A " FWD RESP\n", src_port->name(), pkt->cmdString(), 51810402SN/A pkt->getAddr()); 51910402SN/A 5209714SN/A // as a normal response, it should go back to a master through 52110888Sandreas.hansson@arm.com // one of our slave ports, we also pay for any outstanding 52210888Sandreas.hansson@arm.com // header latency 52310888Sandreas.hansson@arm.com Tick latency = pkt->headerDelay; 52410888Sandreas.hansson@arm.com pkt->headerDelay = 0; 52510888Sandreas.hansson@arm.com slavePorts[dest_port_id]->schedTimingResp(pkt, curTick() + latency); 5269716SN/A 5279716SN/A respLayers[dest_port_id]->succeededTiming(packetFinishTime); 5283244SN/A } 5293244SN/A 53010656Sandreas.hansson@arm.com // remove the request from the routing table 53110656Sandreas.hansson@arm.com routeTo.erase(route_lookup); 53210656Sandreas.hansson@arm.com 5339712SN/A // stats updates 5349712SN/A transDist[pkt_cmd]++; 53510405Sandreas.hansson@arm.com snoops++; 5369712SN/A 5378948SN/A return true; 5388948SN/A} 5398948SN/A 5403210SN/A 5418948SN/Avoid 54210405Sandreas.hansson@arm.comCoherentXBar::forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id, 54310888Sandreas.hansson@arm.com const std::vector<QueuedSlavePort*>& dests) 5448948SN/A{ 54510405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s for %s address %x size %d\n", __func__, 5469663SN/A pkt->cmdString(), pkt->getAddr(), pkt->getSize()); 5479663SN/A 5489524SN/A // snoops should only happen if the system isn't bypassing caches 5499524SN/A assert(!system->bypassCaches()); 5509524SN/A 55110401SN/A unsigned fanout = 0; 55210401SN/A 55310405Sandreas.hansson@arm.com for (const auto& p: dests) { 5548948SN/A // we could have gotten this request from a snooping master 5558948SN/A // (corresponding to our own slave port that is also in 5568948SN/A // snoopPorts) and should not send it back to where it came 5578948SN/A // from 5589031SN/A if (exclude_slave_port_id == InvalidPortID || 5598948SN/A p->getId() != exclude_slave_port_id) { 5608948SN/A // cache is not allowed to refuse snoop 5618975SN/A p->sendTimingSnoopReq(pkt); 56210401SN/A fanout++; 5638948SN/A } 5648948SN/A } 56510401SN/A 56610401SN/A // Stats for fanout of this forward operation 56710401SN/A snoopFanout.sample(fanout); 5682497SN/A} 5692497SN/A 5709092SN/Avoid 57110713Sandreas.hansson@arm.comCoherentXBar::recvReqRetry(PortID master_port_id) 5729092SN/A{ 5739093SN/A // responses and snoop responses never block on forwarding them, 5749093SN/A // so the retry will always be coming from a port to which we 5759093SN/A // tried to forward a request 5769715SN/A reqLayers[master_port_id]->recvRetry(); 5779092SN/A} 5789092SN/A 5799036SN/ATick 58010405Sandreas.hansson@arm.comCoherentXBar::recvAtomic(PacketPtr pkt, PortID slave_port_id) 5812657SN/A{ 58210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvAtomic: packet src %s addr 0x%x cmd %s\n", 5839032SN/A slavePorts[slave_port_id]->name(), pkt->getAddr(), 5848949SN/A pkt->cmdString()); 5858915SN/A 58610405Sandreas.hansson@arm.com unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 58710405Sandreas.hansson@arm.com unsigned int pkt_cmd = pkt->cmdToIndex(); 5889712SN/A 5898979SN/A MemCmd snoop_response_cmd = MemCmd::InvalidCmd; 5908979SN/A Tick snoop_response_latency = 0; 5918979SN/A 59210821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 5938979SN/A // forward to all snoopers but the source 59410402SN/A std::pair<MemCmd, Tick> snoop_result; 59510402SN/A if (snoopFilter) { 59610402SN/A // check with the snoop filter where to forward this packet 59710402SN/A auto sf_res = 59810402SN/A snoopFilter->lookupRequest(pkt, *slavePorts[slave_port_id]); 59910402SN/A snoop_response_latency += sf_res.second * clockPeriod(); 60010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s: src %s %s 0x%x"\ 60110402SN/A " SF size: %i lat: %i\n", __func__, 60210402SN/A slavePorts[slave_port_id]->name(), pkt->cmdString(), 60310402SN/A pkt->getAddr(), sf_res.first.size(), sf_res.second); 60410402SN/A snoop_result = forwardAtomic(pkt, slave_port_id, InvalidPortID, 60510402SN/A sf_res.first); 60610402SN/A } else { 60710402SN/A snoop_result = forwardAtomic(pkt, slave_port_id); 60810402SN/A } 6098979SN/A snoop_response_cmd = snoop_result.first; 61010402SN/A snoop_response_latency += snoop_result.second; 6118979SN/A } 6128915SN/A 6138948SN/A // even if we had a snoop response, we must continue and also 6148948SN/A // perform the actual request at the destination 61510405Sandreas.hansson@arm.com PortID master_port_id = findPort(pkt->getAddr()); 61610405Sandreas.hansson@arm.com 61710405Sandreas.hansson@arm.com // stats updates for the request 61810405Sandreas.hansson@arm.com pktCount[slave_port_id][master_port_id]++; 61910405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 62010405Sandreas.hansson@arm.com transDist[pkt_cmd]++; 6218948SN/A 6228948SN/A // forward the request to the appropriate destination 62310405Sandreas.hansson@arm.com Tick response_latency = masterPorts[master_port_id]->sendAtomic(pkt); 6248948SN/A 62510402SN/A // Lower levels have replied, tell the snoop filter 62610821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches() && pkt->isResponse()) { 62710402SN/A snoopFilter->updateResponse(pkt, *slavePorts[slave_port_id]); 62810402SN/A } 62910402SN/A 6308948SN/A // if we got a response from a snooper, restore it here 6318948SN/A if (snoop_response_cmd != MemCmd::InvalidCmd) { 6328948SN/A // no one else should have responded 6338948SN/A assert(!pkt->isResponse()); 6348948SN/A pkt->cmd = snoop_response_cmd; 6358948SN/A response_latency = snoop_response_latency; 6368948SN/A } 6378948SN/A 6389712SN/A // add the response data 63910405Sandreas.hansson@arm.com if (pkt->isResponse()) { 64010405Sandreas.hansson@arm.com pkt_size = pkt->hasData() ? pkt->getSize() : 0; 64110405Sandreas.hansson@arm.com pkt_cmd = pkt->cmdToIndex(); 64210405Sandreas.hansson@arm.com 64310405Sandreas.hansson@arm.com // stats updates 64410405Sandreas.hansson@arm.com pktCount[slave_port_id][master_port_id]++; 64510405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 64610405Sandreas.hansson@arm.com transDist[pkt_cmd]++; 64710405Sandreas.hansson@arm.com } 6489712SN/A 64910694SMarco.Balboni@ARM.com // @todo: Not setting header time 65010694SMarco.Balboni@ARM.com pkt->payloadDelay = response_latency; 6518948SN/A return response_latency; 6528948SN/A} 6538948SN/A 6548948SN/ATick 65510405Sandreas.hansson@arm.comCoherentXBar::recvAtomicSnoop(PacketPtr pkt, PortID master_port_id) 6568948SN/A{ 65710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvAtomicSnoop: packet src %s addr 0x%x cmd %s\n", 6589032SN/A masterPorts[master_port_id]->name(), pkt->getAddr(), 6598949SN/A pkt->cmdString()); 6608948SN/A 6619712SN/A // add the request snoop data 66210405Sandreas.hansson@arm.com snoops++; 6639712SN/A 6648948SN/A // forward to all snoopers 66510402SN/A std::pair<MemCmd, Tick> snoop_result; 66610402SN/A Tick snoop_response_latency = 0; 66710402SN/A if (snoopFilter) { 66810402SN/A auto sf_res = snoopFilter->lookupSnoop(pkt); 66910402SN/A snoop_response_latency += sf_res.second * clockPeriod(); 67010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s: src %s %s 0x%x SF size: %i lat: %i\n", 67110402SN/A __func__, masterPorts[master_port_id]->name(), pkt->cmdString(), 67210402SN/A pkt->getAddr(), sf_res.first.size(), sf_res.second); 67310402SN/A snoop_result = forwardAtomic(pkt, InvalidPortID, master_port_id, 67410402SN/A sf_res.first); 67510402SN/A } else { 67610402SN/A snoop_result = forwardAtomic(pkt, InvalidPortID); 67710402SN/A } 6788948SN/A MemCmd snoop_response_cmd = snoop_result.first; 67910402SN/A snoop_response_latency += snoop_result.second; 6808948SN/A 6818948SN/A if (snoop_response_cmd != MemCmd::InvalidCmd) 6828948SN/A pkt->cmd = snoop_response_cmd; 6838948SN/A 6849712SN/A // add the response snoop data 68510401SN/A if (pkt->isResponse()) { 68610405Sandreas.hansson@arm.com snoops++; 68710401SN/A } 6889712SN/A 68910694SMarco.Balboni@ARM.com // @todo: Not setting header time 69010694SMarco.Balboni@ARM.com pkt->payloadDelay = snoop_response_latency; 6918948SN/A return snoop_response_latency; 6928948SN/A} 6938948SN/A 6948948SN/Astd::pair<MemCmd, Tick> 69510405Sandreas.hansson@arm.comCoherentXBar::forwardAtomic(PacketPtr pkt, PortID exclude_slave_port_id, 69610402SN/A PortID source_master_port_id, 69710888Sandreas.hansson@arm.com const std::vector<QueuedSlavePort*>& dests) 6988948SN/A{ 6999032SN/A // the packet may be changed on snoops, record the original 7009032SN/A // command to enable us to restore it between snoops so that 7018948SN/A // additional snoops can take place properly 7024626SN/A MemCmd orig_cmd = pkt->cmd; 7034879SN/A MemCmd snoop_response_cmd = MemCmd::InvalidCmd; 7044879SN/A Tick snoop_response_latency = 0; 7053662SN/A 7069524SN/A // snoops should only happen if the system isn't bypassing caches 7079524SN/A assert(!system->bypassCaches()); 7089524SN/A 70910401SN/A unsigned fanout = 0; 71010401SN/A 71110405Sandreas.hansson@arm.com for (const auto& p: dests) { 7128915SN/A // we could have gotten this request from a snooping master 7138915SN/A // (corresponding to our own slave port that is also in 7148915SN/A // snoopPorts) and should not send it back to where it came 7158915SN/A // from 71610402SN/A if (exclude_slave_port_id != InvalidPortID && 71710402SN/A p->getId() == exclude_slave_port_id) 71810402SN/A continue; 71910401SN/A 72010402SN/A Tick latency = p->sendAtomicSnoop(pkt); 72110402SN/A fanout++; 72210402SN/A 72310402SN/A // in contrast to a functional access, we have to keep on 72410402SN/A // going as all snoopers must be updated even if we get a 72510402SN/A // response 72610402SN/A if (!pkt->isResponse()) 72710402SN/A continue; 72810402SN/A 72910402SN/A // response from snoop agent 73010402SN/A assert(pkt->cmd != orig_cmd); 73110402SN/A assert(pkt->memInhibitAsserted()); 73210402SN/A // should only happen once 73310402SN/A assert(snoop_response_cmd == MemCmd::InvalidCmd); 73410402SN/A // save response state 73510402SN/A snoop_response_cmd = pkt->cmd; 73610402SN/A snoop_response_latency = latency; 73710402SN/A 73810402SN/A if (snoopFilter) { 73910402SN/A // Handle responses by the snoopers and differentiate between 74010402SN/A // responses to requests from above and snoops from below 74110402SN/A if (source_master_port_id != InvalidPortID) { 74210402SN/A // Getting a response for a snoop from below 74310402SN/A assert(exclude_slave_port_id == InvalidPortID); 74410402SN/A snoopFilter->updateSnoopForward(pkt, *p, 74510402SN/A *masterPorts[source_master_port_id]); 74610402SN/A } else { 74710402SN/A // Getting a response for a request from above 74810402SN/A assert(source_master_port_id == InvalidPortID); 74910402SN/A snoopFilter->updateSnoopResponse(pkt, *p, 75010402SN/A *slavePorts[exclude_slave_port_id]); 7514626SN/A } 7524626SN/A } 75310402SN/A // restore original packet state for remaining snoopers 75410402SN/A pkt->cmd = orig_cmd; 7554626SN/A } 7564626SN/A 75710401SN/A // Stats for fanout 75810401SN/A snoopFanout.sample(fanout); 75910401SN/A 7608948SN/A // the packet is restored as part of the loop and any potential 7618948SN/A // snoop response is part of the returned pair 7628948SN/A return std::make_pair(snoop_response_cmd, snoop_response_latency); 7632497SN/A} 7642497SN/A 7652497SN/Avoid 76610405Sandreas.hansson@arm.comCoherentXBar::recvFunctional(PacketPtr pkt, PortID slave_port_id) 7672497SN/A{ 7688663SN/A if (!pkt->isPrint()) { 7698663SN/A // don't do DPRINTFs on PrintReq as it clutters up the output 77010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, 7718949SN/A "recvFunctional: packet src %s addr 0x%x cmd %s\n", 7729032SN/A slavePorts[slave_port_id]->name(), pkt->getAddr(), 7738663SN/A pkt->cmdString()); 7748663SN/A } 7758663SN/A 77610821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 7778979SN/A // forward to all snoopers but the source 7789032SN/A forwardFunctional(pkt, slave_port_id); 7798979SN/A } 7804912SN/A 7818948SN/A // there is no need to continue if the snooping has found what we 7828948SN/A // were looking for and the packet is already a response 7838948SN/A if (!pkt->isResponse()) { 78410888Sandreas.hansson@arm.com // since our slave ports are queued ports we need to check them as well 78510888Sandreas.hansson@arm.com for (const auto& p : slavePorts) { 78610888Sandreas.hansson@arm.com // if we find a response that has the data, then the 78710888Sandreas.hansson@arm.com // downstream caches/memories may be out of date, so simply stop 78810888Sandreas.hansson@arm.com // here 78910888Sandreas.hansson@arm.com if (p->checkFunctional(pkt)) { 79010888Sandreas.hansson@arm.com if (pkt->needsResponse()) 79110888Sandreas.hansson@arm.com pkt->makeResponse(); 79210888Sandreas.hansson@arm.com return; 79310888Sandreas.hansson@arm.com } 79410888Sandreas.hansson@arm.com } 79510888Sandreas.hansson@arm.com 7969031SN/A PortID dest_id = findPort(pkt->getAddr()); 7978948SN/A 7988948SN/A masterPorts[dest_id]->sendFunctional(pkt); 7998948SN/A } 8008948SN/A} 8018948SN/A 8028948SN/Avoid 80310405Sandreas.hansson@arm.comCoherentXBar::recvFunctionalSnoop(PacketPtr pkt, PortID master_port_id) 8048948SN/A{ 8058948SN/A if (!pkt->isPrint()) { 8068948SN/A // don't do DPRINTFs on PrintReq as it clutters up the output 80710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, 8088949SN/A "recvFunctionalSnoop: packet src %s addr 0x%x cmd %s\n", 8099032SN/A masterPorts[master_port_id]->name(), pkt->getAddr(), 8108948SN/A pkt->cmdString()); 8118948SN/A } 8128948SN/A 8138948SN/A // forward to all snoopers 8149031SN/A forwardFunctional(pkt, InvalidPortID); 8158948SN/A} 8168948SN/A 8178948SN/Avoid 81810405Sandreas.hansson@arm.comCoherentXBar::forwardFunctional(PacketPtr pkt, PortID exclude_slave_port_id) 8198948SN/A{ 8209524SN/A // snoops should only happen if the system isn't bypassing caches 8219524SN/A assert(!system->bypassCaches()); 8229524SN/A 82310405Sandreas.hansson@arm.com for (const auto& p: snoopPorts) { 8248915SN/A // we could have gotten this request from a snooping master 8258915SN/A // (corresponding to our own slave port that is also in 8268915SN/A // snoopPorts) and should not send it back to where it came 8278915SN/A // from 8289031SN/A if (exclude_slave_port_id == InvalidPortID || 8298948SN/A p->getId() != exclude_slave_port_id) 8308948SN/A p->sendFunctionalSnoop(pkt); 8318915SN/A 8328948SN/A // if we get a response we are done 8338948SN/A if (pkt->isResponse()) { 8348948SN/A break; 8358915SN/A } 8363650SN/A } 8372497SN/A} 8382497SN/A 8399712SN/Avoid 84010405Sandreas.hansson@arm.comCoherentXBar::regStats() 8419712SN/A{ 84210405Sandreas.hansson@arm.com // register the stats of the base class and our layers 84310405Sandreas.hansson@arm.com BaseXBar::regStats(); 84410405Sandreas.hansson@arm.com for (auto l: reqLayers) 84510405Sandreas.hansson@arm.com l->regStats(); 84610405Sandreas.hansson@arm.com for (auto l: respLayers) 84710405Sandreas.hansson@arm.com l->regStats(); 84810405Sandreas.hansson@arm.com for (auto l: snoopLayers) 84910405Sandreas.hansson@arm.com l->regStats(); 8509712SN/A 85110405Sandreas.hansson@arm.com snoops 85210405Sandreas.hansson@arm.com .name(name() + ".snoops") 85310401SN/A .desc("Total snoops (count)") 85410401SN/A ; 85510401SN/A 85610401SN/A snoopFanout 85710401SN/A .init(0, snoopPorts.size(), 1) 85810401SN/A .name(name() + ".snoop_fanout") 85910401SN/A .desc("Request fanout histogram") 86010401SN/A ; 8619712SN/A} 8629712SN/A 86310405Sandreas.hansson@arm.comCoherentXBar * 86410405Sandreas.hansson@arm.comCoherentXBarParams::create() 8652497SN/A{ 86610405Sandreas.hansson@arm.com return new CoherentXBar(this); 8672497SN/A} 868