src/mem/ruby/network/garnet/fixed-pipeline/Switch_d.cc

   1 /*
   2  * Copyright (c) 2008 Princeton University
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Niket Agarwal
  29  */
  30
  31 #include "base/stl_helpers.hh"
  32 #include "mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.hh"
  33 #include "mem/ruby/network/garnet/fixed-pipeline/Router_d.hh"
  34 #include "mem/ruby/network/garnet/fixed-pipeline/Switch_d.hh"
  35
  36 using m5::stl_helpers::deletePointers;
  37
  38 Switch_d::Switch_d(Router_d *router)
  39 {
  40     m_router = router;
  41     m_num_vcs = m_router->get_num_vcs();
  42     m_crossbar_activity = 0;
  43 }
  44
  45 Switch_d::~Switch_d()
  46 {
  47     deletePointers(m_switch_buffer);
  48 }
  49
  50 void
  51 Switch_d::init()
  52 {
  53     m_output_unit = m_router->get_outputUnit_ref();
  54
  55     m_num_inports = m_router->get_num_inports();
  56     m_switch_buffer.resize(m_num_inports);
  57     for (int i = 0; i < m_num_inports; i++) {
  58         m_switch_buffer[i] = new flitBuffer_d();
  59     }
  60 }
  61
  62 void
  63 Switch_d::wakeup()
  64 {
  65     DPRINTF(RubyNetwork, "Switch woke up at time: %lld\n",
  66             g_eventQueue_ptr->getTime());
  67
  68     for (int inport = 0; inport < m_num_inports; inport++) {
  69         if (!m_switch_buffer[inport]->isReady())
  70             continue;
  71         flit_d *t_flit = m_switch_buffer[inport]->peekTopFlit();
  72         if (t_flit->is_stage(ST_)) {
  73             int outport = t_flit->get_outport();
  74             t_flit->advance_stage(LT_);
  75             t_flit->set_time(g_eventQueue_ptr->getTime() + 1);
  76
  77             // This will take care of waking up the Network Link
  78             m_output_unit[outport]->insert_flit(t_flit);
  79             m_switch_buffer[inport]->getTopFlit();
  80             m_crossbar_activity++;
  81         }
  82     }
  83     check_for_wakeup();
  84 }
  85
  86 void
  87 Switch_d::check_for_wakeup()
  88 {
  89     for (int inport = 0; inport < m_num_inports; inport++) {
  90         if (m_switch_buffer[inport]->isReadyForNext()) {
  91             g_eventQueue_ptr->scheduleEvent(this, 1);
  92             break;
  93         }
  94     }
  95 }