src/mem/ruby/network/garnet2.0/NetworkLink.cc

   1 /*
   2  * Copyright (c) 2020 Advanced Micro Devices, Inc.
   3  * Copyright (c) 2020 Inria
   4  * Copyright (c) 2016 Georgia Institute of Technology
   5  * Copyright (c) 2008 Princeton University
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are
  10  * met: redistributions of source code must retain the above copyright
  11  * notice, this list of conditions and the following disclaimer;
  12  * redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution;
  15  * neither the name of the copyright holders nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32
  33 #include "mem/ruby/network/garnet2.0/NetworkLink.hh"
  34
  35 #include "base/trace.hh"
  36 #include "debug/RubyNetwork.hh"
  37 #include "mem/ruby/network/garnet2.0/CreditLink.hh"
  38
  39 NetworkLink::NetworkLink(const Params *p)
  40     : ClockedObject(p), Consumer(this), m_id(p->link_id),
  41       m_type(NUM_LINK_TYPES_),
  42       m_latency(p->link_latency), m_link_utilized(0),
  43       m_virt_nets(p->virt_nets), linkBuffer(),
  44       link_consumer(nullptr), link_srcQueue(nullptr)
  45 {
  46     int num_vnets = (p->supported_vnets).size();
  47     mVnets.resize(num_vnets);
  48     bitWidth = p->width;
  49     for (int i = 0; i < num_vnets; i++) {
  50         mVnets[i] = p->supported_vnets[i];
  51     }
  52 }
  53
  54 void
  55 NetworkLink::setLinkConsumer(Consumer *consumer)
  56 {
  57     link_consumer = consumer;
  58 }
  59
  60 void
  61 NetworkLink::setVcsPerVnet(uint32_t consumerVcs)
  62 {
  63     m_vc_load.resize(m_virt_nets * consumerVcs);
  64 }
  65
  66 void
  67 NetworkLink::setSourceQueue(flitBuffer *src_queue, ClockedObject *srcClockObj)
  68 {
  69     link_srcQueue = src_queue;
  70     src_object = srcClockObj;
  71 }
  72
  73 void
  74 NetworkLink::wakeup()
  75 {
  76     DPRINTF(RubyNetwork, "Woke up to transfer flits from %s\n",
  77         src_object->name());
  78     assert(link_srcQueue != nullptr);
  79     assert(curTick() == clockEdge());
  80     if (link_srcQueue->isReady(curTick())) {
  81         flit *t_flit = link_srcQueue->getTopFlit();
  82         DPRINTF(RubyNetwork, "Transmission will finish at %ld :%s\n",
  83                 clockEdge(m_latency), *t_flit);
  84         if (m_type != NUM_LINK_TYPES_) {
  85             // Only for assertions and debug messages
  86             assert(t_flit->m_width == bitWidth);
  87             assert((std::find(mVnets.begin(), mVnets.end(),
  88                 t_flit->get_vnet()) != mVnets.end()) ||
  89                 (mVnets.size() == 0));
  90         }
  91         t_flit->set_time(clockEdge(m_latency));
  92         linkBuffer.insert(t_flit);
  93         link_consumer->scheduleEventAbsolute(clockEdge(m_latency));
  94         m_link_utilized++;
  95         m_vc_load[t_flit->get_vc()]++;
  96     }
  97
  98     if (!link_srcQueue->isEmpty()) {
  99         scheduleEvent(Cycles(1));
 100     }
 101 }
 102
 103 void
 104 NetworkLink::resetStats()
 105 {
 106     for (int i = 0; i < m_vc_load.size(); i++) {
 107         m_vc_load[i] = 0;
 108     }
 109
 110     m_link_utilized = 0;
 111 }
 112
 113 NetworkLink *
 114 NetworkLinkParams::create()
 115 {
 116     return new NetworkLink(this);
 117 }
 118
 119 CreditLink *
 120 CreditLinkParams::create()
 121 {
 122     return new CreditLink(this);
 123 }
 124
 125 uint32_t
 126 NetworkLink::functionalWrite(Packet *pkt)
 127 {
 128     return linkBuffer.functionalWrite(pkt);
 129 }