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

   1 /*
   2  * Copyright (c) 2008 Princeton University
   3  * Copyright (c) 2016 Georgia Institute of Technology
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met: redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer;
  10  * redistributions in binary form must reproduce the above copyright
  11  * notice, this list of conditions and the following disclaimer in the
  12  * documentation and/or other materials provided with the distribution;
  13  * neither the name of the copyright holders nor the names of its
  14  * contributors may be used to endorse or promote products derived from
  15  * this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30
  31 #include "mem/ruby/network/garnet2.0/OutVcState.hh"
  32
  33 #include "mem/ruby/system/RubySystem.hh"
  34
  35 OutVcState::OutVcState(int id, GarnetNetwork *network_ptr,
  36     uint32_t consumerVcs)
  37     : m_time(0)
  38 {
  39     m_id = id;
  40     m_vc_state = IDLE_;
  41     /*
  42      * We find the virtual network using the number of
  43      * vcs per vnet. This assumes that the same vcs per
  44      * vnet is used throughout the given object.
  45      */
  46     int vnet = floor(id/consumerVcs);
  47
  48     if (network_ptr->get_vnet_type(vnet) == DATA_VNET_)
  49         m_max_credit_count = network_ptr->getBuffersPerDataVC();
  50     else
  51         m_max_credit_count = network_ptr->getBuffersPerCtrlVC();
  52
  53     m_credit_count = m_max_credit_count;
  54     assert(m_credit_count >= 1);
  55 }
  56
  57 void
  58 OutVcState::increment_credit()
  59 {
  60     m_credit_count++;
  61     assert(m_credit_count <= m_max_credit_count);
  62 }
  63
  64 void
  65 OutVcState::decrement_credit()
  66 {
  67     m_credit_count--;
  68     assert(m_credit_count >= 0);
  69 }