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_vc_load(p->vcs_per_vnet * p->virt_nets),
  44       linkBuffer(), link_consumer(nullptr),
  45       link_srcQueue(nullptr)
  46 {
  47     int num_vnets = (p->supported_vnets).size();
  48     assert(num_vnets > 0);
  49     mVnets.resize(num_vnets);
  50     bitWidth = p->width;
  51     for (int i = 0; i < num_vnets; i++) {
  52         mVnets[i] = p->supported_vnets[i];
  53     }
  54     DPRINTF(RubyNetwork,"Created with bitwidth:%d\n", bitWidth);
  55 }
  56
  57 void
  58 NetworkLink::setLinkConsumer(Consumer *consumer)
  59 {
  60     link_consumer = consumer;
  61 }
  62
  63 void
  64 NetworkLink::setSourceQueue(flitBuffer *src_queue, ClockedObject *srcClockObj)
  65 {
  66     link_srcQueue = src_queue;
  67     src_object = srcClockObj;
  68 }
  69
  70 void
  71 NetworkLink::wakeup()
  72 {
  73     DPRINTF(RubyNetwork, "Woke up to transfer flits from %s\n",
  74         src_object->name());
  75     assert(link_srcQueue != nullptr);
  76     assert(curTick() == clockEdge());
  77     if (link_srcQueue->isReady(curTick())) {
  78         flit *t_flit = link_srcQueue->getTopFlit();
  79         DPRINTF(RubyNetwork, "Transmission will finish at %ld :%s\n",
  80                 clockEdge(m_latency), *t_flit);
  81         if (m_type != NUM_LINK_TYPES_) {
  82             // Only for assertions and debug messages
  83             assert(t_flit->m_width == bitWidth);
  84             assert((std::find(mVnets.begin(), mVnets.end(),
  85                 t_flit->get_vnet()) != mVnets.end()) ||
  86                 (mVnets.size() == 0));
  87         }
  88         t_flit->set_time(clockEdge(m_latency));
  89         linkBuffer.insert(t_flit);
  90         link_consumer->scheduleEventAbsolute(clockEdge(m_latency));
  91         m_link_utilized++;
  92         m_vc_load[t_flit->get_vc()]++;
  93     }
  94
  95     if (!link_srcQueue->isEmpty()) {
  96         scheduleEvent(Cycles(1));
  97     }
  98 }
  99
 100 void
 101 NetworkLink::resetStats()
 102 {
 103     for (int i = 0; i < m_vc_load.size(); i++) {
 104         m_vc_load[i] = 0;
 105     }
 106
 107     m_link_utilized = 0;
 108 }
 109
 110 NetworkLink *
 111 NetworkLinkParams::create()
 112 {
 113     return new NetworkLink(this);
 114 }
 115
 116 CreditLink *
 117 CreditLinkParams::create()
 118 {
 119     return new CreditLink(this);
 120 }
 121
 122 uint32_t
 123 NetworkLink::functionalWrite(Packet *pkt)
 124 {
 125     return linkBuffer.functionalWrite(pkt);
 126 }