coherent_xbar.cc revision 10821
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); 9210405Sandreas.hansson@arm.com SlavePort* 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{ 1418975SN/A // determine the source port based on the id 1429032SN/A SlavePort *src_port = slavePorts[slave_port_id]; 1433244SN/A 1449091SN/A // remember if the packet is an express snoop 1459091SN/A bool is_express_snoop = pkt->isExpressSnoop(); 14610656Sandreas.hansson@arm.com bool is_inhibited = pkt->memInhibitAsserted(); 14710656Sandreas.hansson@arm.com // for normal requests, going downstream, the express snoop flag 14810656Sandreas.hansson@arm.com // and the inhibited flag should always be the same 14910656Sandreas.hansson@arm.com assert(is_express_snoop == is_inhibited); 1509091SN/A 1519612SN/A // determine the destination based on the address 1529712SN/A PortID master_port_id = findPort(pkt->getAddr()); 1539612SN/A 15410405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the current 1559033SN/A // port, and exclude express snoops from the check 1569715SN/A if (!is_express_snoop && !reqLayers[master_port_id]->tryTiming(src_port)) { 15710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x BUSY\n", 1588949SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 1593244SN/A return false; 1603244SN/A } 1613244SN/A 16210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s expr %d 0x%x\n", 1639091SN/A src_port->name(), pkt->cmdString(), is_express_snoop, 1649091SN/A pkt->getAddr()); 1655197SN/A 1669712SN/A // store size and command as they might be modified when 1679712SN/A // forwarding the packet 1689712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 1699712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 1709712SN/A 17110719SMarco.Balboni@ARM.com // store the old header delay so we can restore it if needed 17210719SMarco.Balboni@ARM.com Tick old_header_delay = pkt->headerDelay; 17310719SMarco.Balboni@ARM.com 17410719SMarco.Balboni@ARM.com // a request sees the frontend and forward latency 17510719SMarco.Balboni@ARM.com Tick xbar_delay = (frontendLatency + forwardLatency) * clockPeriod(); 17610719SMarco.Balboni@ARM.com 17710719SMarco.Balboni@ARM.com // set the packet header and payload delay 17810719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 17910719SMarco.Balboni@ARM.com 18010719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 18110719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 1824912SN/A 18310821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 1848979SN/A // the packet is a memory-mapped request and should be 1858979SN/A // broadcasted to our snoopers but the source 18610402SN/A if (snoopFilter) { 18710402SN/A // check with the snoop filter where to forward this packet 18810402SN/A auto sf_res = snoopFilter->lookupRequest(pkt, *src_port); 18910719SMarco.Balboni@ARM.com // If SnoopFilter is enabled, the total time required by a packet 19010719SMarco.Balboni@ARM.com // to be delivered through the xbar has to be charged also with 19110719SMarco.Balboni@ARM.com // to lookup latency of the snoop filter (sf_res.second). 19210719SMarco.Balboni@ARM.com pkt->headerDelay += sf_res.second * clockPeriod(); 19310402SN/A packetFinishTime += sf_res.second * clockPeriod(); 19410405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x"\ 19510402SN/A " SF size: %i lat: %i\n", src_port->name(), 19610402SN/A pkt->cmdString(), pkt->getAddr(), sf_res.first.size(), 19710402SN/A sf_res.second); 19810402SN/A forwardTiming(pkt, slave_port_id, sf_res.first); 19910402SN/A } else { 20010402SN/A forwardTiming(pkt, slave_port_id); 20110402SN/A } 2028979SN/A } 2038948SN/A 20410656Sandreas.hansson@arm.com // remember if the packet will generate a snoop response 20510656Sandreas.hansson@arm.com const bool expect_snoop_resp = !is_inhibited && pkt->memInhibitAsserted(); 20610656Sandreas.hansson@arm.com const bool expect_response = pkt->needsResponse() && 20710656Sandreas.hansson@arm.com !pkt->memInhibitAsserted(); 2088915SN/A 20910402SN/A // Note: Cannot create a copy of the full packet, here. 21010402SN/A MemCmd orig_cmd(pkt->cmd); 21110402SN/A 2129612SN/A // since it is a normal request, attempt to send the packet 2139712SN/A bool success = masterPorts[master_port_id]->sendTimingReq(pkt); 2148948SN/A 21510821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches()) { 21610402SN/A // The packet may already be overwritten by the sendTimingReq function. 21710402SN/A // The snoop filter needs to see the original request *and* the return 21810402SN/A // status of the send operation, so we need to recreate the original 21910402SN/A // request. Atomic mode does not have the issue, as there the send 22010402SN/A // operation and the response happen instantaneously and don't need two 22110402SN/A // phase tracking. 22210402SN/A MemCmd tmp_cmd(pkt->cmd); 22310402SN/A pkt->cmd = orig_cmd; 22410402SN/A // Let the snoop filter know about the success of the send operation 22510402SN/A snoopFilter->updateRequest(pkt, *src_port, !success); 22610402SN/A pkt->cmd = tmp_cmd; 22710402SN/A } 22810402SN/A 22910656Sandreas.hansson@arm.com // check if we were successful in sending the packet onwards 23010656Sandreas.hansson@arm.com if (!success) { 23110656Sandreas.hansson@arm.com // express snoops and inhibited packets should never be forced 23210656Sandreas.hansson@arm.com // to retry 23310656Sandreas.hansson@arm.com assert(!is_express_snoop); 23410656Sandreas.hansson@arm.com assert(!pkt->memInhibitAsserted()); 23510656Sandreas.hansson@arm.com 23610719SMarco.Balboni@ARM.com // restore the header delay 23710719SMarco.Balboni@ARM.com pkt->headerDelay = old_header_delay; 23810656Sandreas.hansson@arm.com 23910656Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingReq: src %s %s 0x%x RETRY\n", 24010656Sandreas.hansson@arm.com src_port->name(), pkt->cmdString(), pkt->getAddr()); 24110656Sandreas.hansson@arm.com 24210656Sandreas.hansson@arm.com // update the layer state and schedule an idle event 24310656Sandreas.hansson@arm.com reqLayers[master_port_id]->failedTiming(src_port, 24410719SMarco.Balboni@ARM.com clockEdge(Cycles(1))); 2459091SN/A } else { 24610656Sandreas.hansson@arm.com // express snoops currently bypass the crossbar state entirely 24710656Sandreas.hansson@arm.com if (!is_express_snoop) { 24810656Sandreas.hansson@arm.com // if this particular request will generate a snoop 24910656Sandreas.hansson@arm.com // response 25010656Sandreas.hansson@arm.com if (expect_snoop_resp) { 25110656Sandreas.hansson@arm.com // we should never have an exsiting request outstanding 25210656Sandreas.hansson@arm.com assert(outstandingSnoop.find(pkt->req) == 25310656Sandreas.hansson@arm.com outstandingSnoop.end()); 25410656Sandreas.hansson@arm.com outstandingSnoop.insert(pkt->req); 2558948SN/A 25610656Sandreas.hansson@arm.com // basic sanity check on the outstanding snoops 25710656Sandreas.hansson@arm.com panic_if(outstandingSnoop.size() > 512, 25810656Sandreas.hansson@arm.com "Outstanding snoop requests exceeded 512\n"); 25910656Sandreas.hansson@arm.com } 2608948SN/A 26110656Sandreas.hansson@arm.com // remember where to route the normal response to 26210656Sandreas.hansson@arm.com if (expect_response || expect_snoop_resp) { 26310656Sandreas.hansson@arm.com assert(routeTo.find(pkt->req) == routeTo.end()); 26410656Sandreas.hansson@arm.com routeTo[pkt->req] = slave_port_id; 2659549SN/A 26610656Sandreas.hansson@arm.com panic_if(routeTo.size() > 512, 26710656Sandreas.hansson@arm.com "Routing table exceeds 512 packets\n"); 26810656Sandreas.hansson@arm.com } 2698948SN/A 27010405Sandreas.hansson@arm.com // update the layer state and schedule an idle event 2719715SN/A reqLayers[master_port_id]->succeededTiming(packetFinishTime); 2729091SN/A } 2738975SN/A 27410656Sandreas.hansson@arm.com // stats updates only consider packets that were successfully sent 2759712SN/A pktCount[slave_port_id][master_port_id]++; 27610405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 2779712SN/A transDist[pkt_cmd]++; 27810656Sandreas.hansson@arm.com 27910656Sandreas.hansson@arm.com if (is_express_snoop) 28010656Sandreas.hansson@arm.com snoops++; 2819712SN/A } 2829712SN/A 2839091SN/A return success; 2848975SN/A} 2858975SN/A 2868975SN/Abool 28710405Sandreas.hansson@arm.comCoherentXBar::recvTimingResp(PacketPtr pkt, PortID master_port_id) 2888975SN/A{ 2898975SN/A // determine the source port based on the id 2909032SN/A MasterPort *src_port = masterPorts[master_port_id]; 2918975SN/A 29210656Sandreas.hansson@arm.com // determine the destination 29310656Sandreas.hansson@arm.com const auto route_lookup = routeTo.find(pkt->req); 29410656Sandreas.hansson@arm.com assert(route_lookup != routeTo.end()); 29510656Sandreas.hansson@arm.com const PortID slave_port_id = route_lookup->second; 29610572Sandreas.hansson@arm.com assert(slave_port_id != InvalidPortID); 29710572Sandreas.hansson@arm.com assert(slave_port_id < respLayers.size()); 2989713SN/A 29910405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the 30010405Sandreas.hansson@arm.com // current port 3019715SN/A if (!respLayers[slave_port_id]->tryTiming(src_port)) { 30210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingResp: src %s %s 0x%x BUSY\n", 3038975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 3048975SN/A return false; 3058975SN/A } 3068975SN/A 30710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingResp: src %s %s 0x%x\n", 3088975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 3098975SN/A 3109712SN/A // store size and command as they might be modified when 3119712SN/A // forwarding the packet 3129712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 3139712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 3149712SN/A 31510719SMarco.Balboni@ARM.com // a response sees the response latency 31610719SMarco.Balboni@ARM.com Tick xbar_delay = responseLatency * clockPeriod(); 31710719SMarco.Balboni@ARM.com 31810719SMarco.Balboni@ARM.com // set the packet header and payload delay 31910719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 32010719SMarco.Balboni@ARM.com 32110719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 32210719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 3238975SN/A 32410821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches()) { 32510402SN/A // let the snoop filter inspect the response and update its state 32610402SN/A snoopFilter->updateResponse(pkt, *slavePorts[slave_port_id]); 32710402SN/A } 32810402SN/A 3299712SN/A // send the packet through the destination slave port 3309712SN/A bool success M5_VAR_USED = slavePorts[slave_port_id]->sendTimingResp(pkt); 3318975SN/A 3328975SN/A // currently it is illegal to block responses... can lead to 3338975SN/A // deadlock 3348975SN/A assert(success); 3358975SN/A 33610656Sandreas.hansson@arm.com // remove the request from the routing table 33710656Sandreas.hansson@arm.com routeTo.erase(route_lookup); 33810656Sandreas.hansson@arm.com 3399715SN/A respLayers[slave_port_id]->succeededTiming(packetFinishTime); 3408975SN/A 3419712SN/A // stats updates 3429712SN/A pktCount[slave_port_id][master_port_id]++; 34310405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 3449712SN/A transDist[pkt_cmd]++; 3459712SN/A 3468975SN/A return true; 3478975SN/A} 3488975SN/A 3498975SN/Avoid 35010405Sandreas.hansson@arm.comCoherentXBar::recvTimingSnoopReq(PacketPtr pkt, PortID master_port_id) 3518975SN/A{ 35210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopReq: src %s %s 0x%x\n", 3539032SN/A masterPorts[master_port_id]->name(), pkt->cmdString(), 3548975SN/A pkt->getAddr()); 3558975SN/A 3569712SN/A // update stats here as we know the forwarding will succeed 3579712SN/A transDist[pkt->cmdToIndex()]++; 35810405Sandreas.hansson@arm.com snoops++; 3599712SN/A 3608975SN/A // we should only see express snoops from caches 3618975SN/A assert(pkt->isExpressSnoop()); 3628975SN/A 36310656Sandreas.hansson@arm.com // remeber if the packet is inhibited so we can see if it changes 36410656Sandreas.hansson@arm.com const bool is_inhibited = pkt->memInhibitAsserted(); 3659032SN/A 36610402SN/A if (snoopFilter) { 36710402SN/A // let the Snoop Filter work its magic and guide probing 36810402SN/A auto sf_res = snoopFilter->lookupSnoop(pkt); 36910402SN/A // No timing here: packetFinishTime += sf_res.second * clockPeriod(); 37010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopReq: src %s %s 0x%x"\ 37110402SN/A " SF size: %i lat: %i\n", masterPorts[master_port_id]->name(), 37210402SN/A pkt->cmdString(), pkt->getAddr(), sf_res.first.size(), 37310402SN/A sf_res.second); 37410402SN/A 37510402SN/A // forward to all snoopers 37610402SN/A forwardTiming(pkt, InvalidPortID, sf_res.first); 37710402SN/A } else { 37810402SN/A forwardTiming(pkt, InvalidPortID); 37910402SN/A } 3808975SN/A 38110656Sandreas.hansson@arm.com // if we can expect a response, remember how to route it 38210656Sandreas.hansson@arm.com if (!is_inhibited && pkt->memInhibitAsserted()) { 38310656Sandreas.hansson@arm.com assert(routeTo.find(pkt->req) == routeTo.end()); 38410656Sandreas.hansson@arm.com routeTo[pkt->req] = master_port_id; 38510656Sandreas.hansson@arm.com } 38610656Sandreas.hansson@arm.com 3878975SN/A // a snoop request came from a connected slave device (one of 3888975SN/A // our master ports), and if it is not coming from the slave 3898975SN/A // device responsible for the address range something is 3908975SN/A // wrong, hence there is nothing further to do as the packet 3918975SN/A // would be going back to where it came from 3929032SN/A assert(master_port_id == findPort(pkt->getAddr())); 3938975SN/A} 3948975SN/A 3958975SN/Abool 39610405Sandreas.hansson@arm.comCoherentXBar::recvTimingSnoopResp(PacketPtr pkt, PortID slave_port_id) 3978975SN/A{ 3988975SN/A // determine the source port based on the id 3999032SN/A SlavePort* src_port = slavePorts[slave_port_id]; 4008975SN/A 40110656Sandreas.hansson@arm.com // get the destination 40210656Sandreas.hansson@arm.com const auto route_lookup = routeTo.find(pkt->req); 40310656Sandreas.hansson@arm.com assert(route_lookup != routeTo.end()); 40410656Sandreas.hansson@arm.com const PortID dest_port_id = route_lookup->second; 40510572Sandreas.hansson@arm.com assert(dest_port_id != InvalidPortID); 4069714SN/A 4079714SN/A // determine if the response is from a snoop request we 4089714SN/A // created as the result of a normal request (in which case it 40910656Sandreas.hansson@arm.com // should be in the outstandingSnoop), or if we merely forwarded 4109714SN/A // someone else's snoop request 41110656Sandreas.hansson@arm.com const bool forwardAsSnoop = outstandingSnoop.find(pkt->req) == 41210656Sandreas.hansson@arm.com outstandingSnoop.end(); 4139714SN/A 41410405Sandreas.hansson@arm.com // test if the crossbar should be considered occupied for the 41510405Sandreas.hansson@arm.com // current port, note that the check is bypassed if the response 41610405Sandreas.hansson@arm.com // is being passed on as a normal response since this is occupying 41710405Sandreas.hansson@arm.com // the response layer rather than the snoop response layer 4189715SN/A if (forwardAsSnoop) { 41910572Sandreas.hansson@arm.com assert(dest_port_id < snoopLayers.size()); 4209715SN/A if (!snoopLayers[dest_port_id]->tryTiming(src_port)) { 42110405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n", 4229715SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 4239715SN/A return false; 4249715SN/A } 4259716SN/A } else { 4269716SN/A // get the master port that mirrors this slave port internally 4279716SN/A MasterPort* snoop_port = snoopRespPorts[slave_port_id]; 42810572Sandreas.hansson@arm.com assert(dest_port_id < respLayers.size()); 4299716SN/A if (!respLayers[dest_port_id]->tryTiming(snoop_port)) { 43010405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x BUSY\n", 4319716SN/A snoop_port->name(), pkt->cmdString(), pkt->getAddr()); 4329716SN/A return false; 4339716SN/A } 4348975SN/A } 4358975SN/A 43610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x\n", 4378975SN/A src_port->name(), pkt->cmdString(), pkt->getAddr()); 4388975SN/A 4399712SN/A // store size and command as they might be modified when 4409712SN/A // forwarding the packet 4419712SN/A unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 4429712SN/A unsigned int pkt_cmd = pkt->cmdToIndex(); 4439712SN/A 4448975SN/A // responses are never express snoops 4458975SN/A assert(!pkt->isExpressSnoop()); 4468975SN/A 44710719SMarco.Balboni@ARM.com // a snoop response sees the snoop response latency, and if it is 44810719SMarco.Balboni@ARM.com // forwarded as a normal response, the response latency 44910719SMarco.Balboni@ARM.com Tick xbar_delay = 45010719SMarco.Balboni@ARM.com (forwardAsSnoop ? snoopResponseLatency : responseLatency) * 45110719SMarco.Balboni@ARM.com clockPeriod(); 45210719SMarco.Balboni@ARM.com 45310719SMarco.Balboni@ARM.com // set the packet header and payload delay 45410719SMarco.Balboni@ARM.com calcPacketTiming(pkt, xbar_delay); 45510719SMarco.Balboni@ARM.com 45610719SMarco.Balboni@ARM.com // determine how long to be crossbar layer is busy 45710719SMarco.Balboni@ARM.com Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 4588975SN/A 4599714SN/A // forward it either as a snoop response or a normal response 4609714SN/A if (forwardAsSnoop) { 4619714SN/A // this is a snoop response to a snoop request we forwarded, 4629714SN/A // e.g. coming from the L1 and going to the L2, and it should 4639714SN/A // be forwarded as a snoop response 46410402SN/A 46510402SN/A if (snoopFilter) { 46610402SN/A // update the probe filter so that it can properly track the line 46710402SN/A snoopFilter->updateSnoopForward(pkt, *slavePorts[slave_port_id], 46810402SN/A *masterPorts[dest_port_id]); 46910402SN/A } 47010402SN/A 4719712SN/A bool success M5_VAR_USED = 4729712SN/A masterPorts[dest_port_id]->sendTimingSnoopResp(pkt); 4739712SN/A pktCount[slave_port_id][dest_port_id]++; 47410405Sandreas.hansson@arm.com pktSize[slave_port_id][dest_port_id] += pkt_size; 4758975SN/A assert(success); 4769714SN/A 4779715SN/A snoopLayers[dest_port_id]->succeededTiming(packetFinishTime); 4783244SN/A } else { 4798975SN/A // we got a snoop response on one of our slave ports, 48010405Sandreas.hansson@arm.com // i.e. from a coherent master connected to the crossbar, and 48110405Sandreas.hansson@arm.com // since we created the snoop request as part of recvTiming, 48210405Sandreas.hansson@arm.com // this should now be a normal response again 48310656Sandreas.hansson@arm.com outstandingSnoop.erase(pkt->req); 4848948SN/A 48510656Sandreas.hansson@arm.com // this is a snoop response from a coherent master, hence it 48610656Sandreas.hansson@arm.com // should never go back to where the snoop response came from, 48710656Sandreas.hansson@arm.com // but instead to where the original request came from 4889712SN/A assert(slave_port_id != dest_port_id); 4898948SN/A 49010402SN/A if (snoopFilter) { 49110402SN/A // update the probe filter so that it can properly track the line 49210402SN/A snoopFilter->updateSnoopResponse(pkt, *slavePorts[slave_port_id], 49310402SN/A *slavePorts[dest_port_id]); 49410402SN/A } 49510402SN/A 49610405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvTimingSnoopResp: src %s %s 0x%x"\ 49710402SN/A " FWD RESP\n", src_port->name(), pkt->cmdString(), 49810402SN/A pkt->getAddr()); 49910402SN/A 5009714SN/A // as a normal response, it should go back to a master through 5019714SN/A // one of our slave ports, at this point we are ignoring the 5029714SN/A // fact that the response layer could be busy and do not touch 5039714SN/A // its state 5049712SN/A bool success M5_VAR_USED = 5059712SN/A slavePorts[dest_port_id]->sendTimingResp(pkt); 5068975SN/A 5079714SN/A // @todo Put the response in an internal FIFO and pass it on 5089714SN/A // to the response layer from there 5099714SN/A 5108975SN/A // currently it is illegal to block responses... can lead 5118975SN/A // to deadlock 5128948SN/A assert(success); 5139716SN/A 5149716SN/A respLayers[dest_port_id]->succeededTiming(packetFinishTime); 5153244SN/A } 5163244SN/A 51710656Sandreas.hansson@arm.com // remove the request from the routing table 51810656Sandreas.hansson@arm.com routeTo.erase(route_lookup); 51910656Sandreas.hansson@arm.com 5209712SN/A // stats updates 5219712SN/A transDist[pkt_cmd]++; 52210405Sandreas.hansson@arm.com snoops++; 5239712SN/A 5248948SN/A return true; 5258948SN/A} 5268948SN/A 5273210SN/A 5288948SN/Avoid 52910405Sandreas.hansson@arm.comCoherentXBar::forwardTiming(PacketPtr pkt, PortID exclude_slave_port_id, 53010402SN/A const std::vector<SlavePort*>& dests) 5318948SN/A{ 53210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s for %s address %x size %d\n", __func__, 5339663SN/A pkt->cmdString(), pkt->getAddr(), pkt->getSize()); 5349663SN/A 5359524SN/A // snoops should only happen if the system isn't bypassing caches 5369524SN/A assert(!system->bypassCaches()); 5379524SN/A 53810401SN/A unsigned fanout = 0; 53910401SN/A 54010405Sandreas.hansson@arm.com for (const auto& p: dests) { 5418948SN/A // we could have gotten this request from a snooping master 5428948SN/A // (corresponding to our own slave port that is also in 5438948SN/A // snoopPorts) and should not send it back to where it came 5448948SN/A // from 5459031SN/A if (exclude_slave_port_id == InvalidPortID || 5468948SN/A p->getId() != exclude_slave_port_id) { 5478948SN/A // cache is not allowed to refuse snoop 5488975SN/A p->sendTimingSnoopReq(pkt); 54910401SN/A fanout++; 5508948SN/A } 5518948SN/A } 55210401SN/A 55310401SN/A // Stats for fanout of this forward operation 55410401SN/A snoopFanout.sample(fanout); 5552497SN/A} 5562497SN/A 5579092SN/Avoid 55810713Sandreas.hansson@arm.comCoherentXBar::recvReqRetry(PortID master_port_id) 5599092SN/A{ 5609093SN/A // responses and snoop responses never block on forwarding them, 5619093SN/A // so the retry will always be coming from a port to which we 5629093SN/A // tried to forward a request 5639715SN/A reqLayers[master_port_id]->recvRetry(); 5649092SN/A} 5659092SN/A 5669036SN/ATick 56710405Sandreas.hansson@arm.comCoherentXBar::recvAtomic(PacketPtr pkt, PortID slave_port_id) 5682657SN/A{ 56910405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvAtomic: packet src %s addr 0x%x cmd %s\n", 5709032SN/A slavePorts[slave_port_id]->name(), pkt->getAddr(), 5718949SN/A pkt->cmdString()); 5728915SN/A 57310405Sandreas.hansson@arm.com unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 57410405Sandreas.hansson@arm.com unsigned int pkt_cmd = pkt->cmdToIndex(); 5759712SN/A 5768979SN/A MemCmd snoop_response_cmd = MemCmd::InvalidCmd; 5778979SN/A Tick snoop_response_latency = 0; 5788979SN/A 57910821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 5808979SN/A // forward to all snoopers but the source 58110402SN/A std::pair<MemCmd, Tick> snoop_result; 58210402SN/A if (snoopFilter) { 58310402SN/A // check with the snoop filter where to forward this packet 58410402SN/A auto sf_res = 58510402SN/A snoopFilter->lookupRequest(pkt, *slavePorts[slave_port_id]); 58610402SN/A snoop_response_latency += sf_res.second * clockPeriod(); 58710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s: src %s %s 0x%x"\ 58810402SN/A " SF size: %i lat: %i\n", __func__, 58910402SN/A slavePorts[slave_port_id]->name(), pkt->cmdString(), 59010402SN/A pkt->getAddr(), sf_res.first.size(), sf_res.second); 59110402SN/A snoop_result = forwardAtomic(pkt, slave_port_id, InvalidPortID, 59210402SN/A sf_res.first); 59310402SN/A } else { 59410402SN/A snoop_result = forwardAtomic(pkt, slave_port_id); 59510402SN/A } 5968979SN/A snoop_response_cmd = snoop_result.first; 59710402SN/A snoop_response_latency += snoop_result.second; 5988979SN/A } 5998915SN/A 6008948SN/A // even if we had a snoop response, we must continue and also 6018948SN/A // perform the actual request at the destination 60210405Sandreas.hansson@arm.com PortID master_port_id = findPort(pkt->getAddr()); 60310405Sandreas.hansson@arm.com 60410405Sandreas.hansson@arm.com // stats updates for the request 60510405Sandreas.hansson@arm.com pktCount[slave_port_id][master_port_id]++; 60610405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 60710405Sandreas.hansson@arm.com transDist[pkt_cmd]++; 6088948SN/A 6098948SN/A // forward the request to the appropriate destination 61010405Sandreas.hansson@arm.com Tick response_latency = masterPorts[master_port_id]->sendAtomic(pkt); 6118948SN/A 61210402SN/A // Lower levels have replied, tell the snoop filter 61310821Sandreas.hansson@arm.com if (snoopFilter && !system->bypassCaches() && pkt->isResponse()) { 61410402SN/A snoopFilter->updateResponse(pkt, *slavePorts[slave_port_id]); 61510402SN/A } 61610402SN/A 6178948SN/A // if we got a response from a snooper, restore it here 6188948SN/A if (snoop_response_cmd != MemCmd::InvalidCmd) { 6198948SN/A // no one else should have responded 6208948SN/A assert(!pkt->isResponse()); 6218948SN/A pkt->cmd = snoop_response_cmd; 6228948SN/A response_latency = snoop_response_latency; 6238948SN/A } 6248948SN/A 6259712SN/A // add the response data 62610405Sandreas.hansson@arm.com if (pkt->isResponse()) { 62710405Sandreas.hansson@arm.com pkt_size = pkt->hasData() ? pkt->getSize() : 0; 62810405Sandreas.hansson@arm.com pkt_cmd = pkt->cmdToIndex(); 62910405Sandreas.hansson@arm.com 63010405Sandreas.hansson@arm.com // stats updates 63110405Sandreas.hansson@arm.com pktCount[slave_port_id][master_port_id]++; 63210405Sandreas.hansson@arm.com pktSize[slave_port_id][master_port_id] += pkt_size; 63310405Sandreas.hansson@arm.com transDist[pkt_cmd]++; 63410405Sandreas.hansson@arm.com } 6359712SN/A 63610694SMarco.Balboni@ARM.com // @todo: Not setting header time 63710694SMarco.Balboni@ARM.com pkt->payloadDelay = response_latency; 6388948SN/A return response_latency; 6398948SN/A} 6408948SN/A 6418948SN/ATick 64210405Sandreas.hansson@arm.comCoherentXBar::recvAtomicSnoop(PacketPtr pkt, PortID master_port_id) 6438948SN/A{ 64410405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "recvAtomicSnoop: packet src %s addr 0x%x cmd %s\n", 6459032SN/A masterPorts[master_port_id]->name(), pkt->getAddr(), 6468949SN/A pkt->cmdString()); 6478948SN/A 6489712SN/A // add the request snoop data 64910405Sandreas.hansson@arm.com snoops++; 6509712SN/A 6518948SN/A // forward to all snoopers 65210402SN/A std::pair<MemCmd, Tick> snoop_result; 65310402SN/A Tick snoop_response_latency = 0; 65410402SN/A if (snoopFilter) { 65510402SN/A auto sf_res = snoopFilter->lookupSnoop(pkt); 65610402SN/A snoop_response_latency += sf_res.second * clockPeriod(); 65710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, "%s: src %s %s 0x%x SF size: %i lat: %i\n", 65810402SN/A __func__, masterPorts[master_port_id]->name(), pkt->cmdString(), 65910402SN/A pkt->getAddr(), sf_res.first.size(), sf_res.second); 66010402SN/A snoop_result = forwardAtomic(pkt, InvalidPortID, master_port_id, 66110402SN/A sf_res.first); 66210402SN/A } else { 66310402SN/A snoop_result = forwardAtomic(pkt, InvalidPortID); 66410402SN/A } 6658948SN/A MemCmd snoop_response_cmd = snoop_result.first; 66610402SN/A snoop_response_latency += snoop_result.second; 6678948SN/A 6688948SN/A if (snoop_response_cmd != MemCmd::InvalidCmd) 6698948SN/A pkt->cmd = snoop_response_cmd; 6708948SN/A 6719712SN/A // add the response snoop data 67210401SN/A if (pkt->isResponse()) { 67310405Sandreas.hansson@arm.com snoops++; 67410401SN/A } 6759712SN/A 67610694SMarco.Balboni@ARM.com // @todo: Not setting header time 67710694SMarco.Balboni@ARM.com pkt->payloadDelay = snoop_response_latency; 6788948SN/A return snoop_response_latency; 6798948SN/A} 6808948SN/A 6818948SN/Astd::pair<MemCmd, Tick> 68210405Sandreas.hansson@arm.comCoherentXBar::forwardAtomic(PacketPtr pkt, PortID exclude_slave_port_id, 68310402SN/A PortID source_master_port_id, 68410402SN/A const std::vector<SlavePort*>& dests) 6858948SN/A{ 6869032SN/A // the packet may be changed on snoops, record the original 6879032SN/A // command to enable us to restore it between snoops so that 6888948SN/A // additional snoops can take place properly 6894626SN/A MemCmd orig_cmd = pkt->cmd; 6904879SN/A MemCmd snoop_response_cmd = MemCmd::InvalidCmd; 6914879SN/A Tick snoop_response_latency = 0; 6923662SN/A 6939524SN/A // snoops should only happen if the system isn't bypassing caches 6949524SN/A assert(!system->bypassCaches()); 6959524SN/A 69610401SN/A unsigned fanout = 0; 69710401SN/A 69810405Sandreas.hansson@arm.com for (const auto& p: dests) { 6998915SN/A // we could have gotten this request from a snooping master 7008915SN/A // (corresponding to our own slave port that is also in 7018915SN/A // snoopPorts) and should not send it back to where it came 7028915SN/A // from 70310402SN/A if (exclude_slave_port_id != InvalidPortID && 70410402SN/A p->getId() == exclude_slave_port_id) 70510402SN/A continue; 70610401SN/A 70710402SN/A Tick latency = p->sendAtomicSnoop(pkt); 70810402SN/A fanout++; 70910402SN/A 71010402SN/A // in contrast to a functional access, we have to keep on 71110402SN/A // going as all snoopers must be updated even if we get a 71210402SN/A // response 71310402SN/A if (!pkt->isResponse()) 71410402SN/A continue; 71510402SN/A 71610402SN/A // response from snoop agent 71710402SN/A assert(pkt->cmd != orig_cmd); 71810402SN/A assert(pkt->memInhibitAsserted()); 71910402SN/A // should only happen once 72010402SN/A assert(snoop_response_cmd == MemCmd::InvalidCmd); 72110402SN/A // save response state 72210402SN/A snoop_response_cmd = pkt->cmd; 72310402SN/A snoop_response_latency = latency; 72410402SN/A 72510402SN/A if (snoopFilter) { 72610402SN/A // Handle responses by the snoopers and differentiate between 72710402SN/A // responses to requests from above and snoops from below 72810402SN/A if (source_master_port_id != InvalidPortID) { 72910402SN/A // Getting a response for a snoop from below 73010402SN/A assert(exclude_slave_port_id == InvalidPortID); 73110402SN/A snoopFilter->updateSnoopForward(pkt, *p, 73210402SN/A *masterPorts[source_master_port_id]); 73310402SN/A } else { 73410402SN/A // Getting a response for a request from above 73510402SN/A assert(source_master_port_id == InvalidPortID); 73610402SN/A snoopFilter->updateSnoopResponse(pkt, *p, 73710402SN/A *slavePorts[exclude_slave_port_id]); 7384626SN/A } 7394626SN/A } 74010402SN/A // restore original packet state for remaining snoopers 74110402SN/A pkt->cmd = orig_cmd; 7424626SN/A } 7434626SN/A 74410401SN/A // Stats for fanout 74510401SN/A snoopFanout.sample(fanout); 74610401SN/A 7478948SN/A // the packet is restored as part of the loop and any potential 7488948SN/A // snoop response is part of the returned pair 7498948SN/A return std::make_pair(snoop_response_cmd, snoop_response_latency); 7502497SN/A} 7512497SN/A 7522497SN/Avoid 75310405Sandreas.hansson@arm.comCoherentXBar::recvFunctional(PacketPtr pkt, PortID slave_port_id) 7542497SN/A{ 7558663SN/A if (!pkt->isPrint()) { 7568663SN/A // don't do DPRINTFs on PrintReq as it clutters up the output 75710405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, 7588949SN/A "recvFunctional: packet src %s addr 0x%x cmd %s\n", 7599032SN/A slavePorts[slave_port_id]->name(), pkt->getAddr(), 7608663SN/A pkt->cmdString()); 7618663SN/A } 7628663SN/A 76310821Sandreas.hansson@arm.com if (!system->bypassCaches()) { 7648979SN/A // forward to all snoopers but the source 7659032SN/A forwardFunctional(pkt, slave_port_id); 7668979SN/A } 7674912SN/A 7688948SN/A // there is no need to continue if the snooping has found what we 7698948SN/A // were looking for and the packet is already a response 7708948SN/A if (!pkt->isResponse()) { 7719031SN/A PortID dest_id = findPort(pkt->getAddr()); 7728948SN/A 7738948SN/A masterPorts[dest_id]->sendFunctional(pkt); 7748948SN/A } 7758948SN/A} 7768948SN/A 7778948SN/Avoid 77810405Sandreas.hansson@arm.comCoherentXBar::recvFunctionalSnoop(PacketPtr pkt, PortID master_port_id) 7798948SN/A{ 7808948SN/A if (!pkt->isPrint()) { 7818948SN/A // don't do DPRINTFs on PrintReq as it clutters up the output 78210405Sandreas.hansson@arm.com DPRINTF(CoherentXBar, 7838949SN/A "recvFunctionalSnoop: packet src %s addr 0x%x cmd %s\n", 7849032SN/A masterPorts[master_port_id]->name(), pkt->getAddr(), 7858948SN/A pkt->cmdString()); 7868948SN/A } 7878948SN/A 7888948SN/A // forward to all snoopers 7899031SN/A forwardFunctional(pkt, InvalidPortID); 7908948SN/A} 7918948SN/A 7928948SN/Avoid 79310405Sandreas.hansson@arm.comCoherentXBar::forwardFunctional(PacketPtr pkt, PortID exclude_slave_port_id) 7948948SN/A{ 7959524SN/A // snoops should only happen if the system isn't bypassing caches 7969524SN/A assert(!system->bypassCaches()); 7979524SN/A 79810405Sandreas.hansson@arm.com for (const auto& p: snoopPorts) { 7998915SN/A // we could have gotten this request from a snooping master 8008915SN/A // (corresponding to our own slave port that is also in 8018915SN/A // snoopPorts) and should not send it back to where it came 8028915SN/A // from 8039031SN/A if (exclude_slave_port_id == InvalidPortID || 8048948SN/A p->getId() != exclude_slave_port_id) 8058948SN/A p->sendFunctionalSnoop(pkt); 8068915SN/A 8078948SN/A // if we get a response we are done 8088948SN/A if (pkt->isResponse()) { 8098948SN/A break; 8108915SN/A } 8113650SN/A } 8122497SN/A} 8132497SN/A 8149092SN/Aunsigned int 81510405Sandreas.hansson@arm.comCoherentXBar::drain(DrainManager *dm) 8169092SN/A{ 8179093SN/A // sum up the individual layers 8189715SN/A unsigned int total = 0; 81910405Sandreas.hansson@arm.com for (auto l: reqLayers) 82010405Sandreas.hansson@arm.com total += l->drain(dm); 82110405Sandreas.hansson@arm.com for (auto l: respLayers) 82210405Sandreas.hansson@arm.com total += l->drain(dm); 82310405Sandreas.hansson@arm.com for (auto l: snoopLayers) 82410405Sandreas.hansson@arm.com total += l->drain(dm); 8259715SN/A return total; 8269092SN/A} 8279092SN/A 8289712SN/Avoid 82910405Sandreas.hansson@arm.comCoherentXBar::regStats() 8309712SN/A{ 83110405Sandreas.hansson@arm.com // register the stats of the base class and our layers 83210405Sandreas.hansson@arm.com BaseXBar::regStats(); 83310405Sandreas.hansson@arm.com for (auto l: reqLayers) 83410405Sandreas.hansson@arm.com l->regStats(); 83510405Sandreas.hansson@arm.com for (auto l: respLayers) 83610405Sandreas.hansson@arm.com l->regStats(); 83710405Sandreas.hansson@arm.com for (auto l: snoopLayers) 83810405Sandreas.hansson@arm.com l->regStats(); 8399712SN/A 84010405Sandreas.hansson@arm.com snoops 84110405Sandreas.hansson@arm.com .name(name() + ".snoops") 84210401SN/A .desc("Total snoops (count)") 84310401SN/A ; 84410401SN/A 84510401SN/A snoopFanout 84610401SN/A .init(0, snoopPorts.size(), 1) 84710401SN/A .name(name() + ".snoop_fanout") 84810401SN/A .desc("Request fanout histogram") 84910401SN/A ; 8509712SN/A} 8519712SN/A 85210405Sandreas.hansson@arm.comCoherentXBar * 85310405Sandreas.hansson@arm.comCoherentXBarParams::create() 8542497SN/A{ 85510405Sandreas.hansson@arm.com return new CoherentXBar(this); 8562497SN/A} 857