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Diffstat (limited to 'src/mem/ruby/network/garnet-fixed-pipeline/VCallocator_d.cc')
| -rw-r--r-- | src/mem/ruby/network/garnet-fixed-pipeline/VCallocator_d.cc | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/src/mem/ruby/network/garnet-fixed-pipeline/VCallocator_d.cc b/src/mem/ruby/network/garnet-fixed-pipeline/VCallocator_d.cc new file mode 100644 index 000000000..b444ebc02 --- /dev/null +++ b/src/mem/ruby/network/garnet-fixed-pipeline/VCallocator_d.cc @@ -0,0 +1,271 @@ +/* + * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * VCallocator_d.C + * + * Niket Agarwal, Princeton University + * + * */ + +#include "NetworkConfig.hh" +#include "VCallocator_d.hh" +#include "Router_d.hh" +#include "InputUnit_d.hh" +#include "OutputUnit_d.hh" +#include "GarnetNetwork_d.hh" + +VCallocator_d::VCallocator_d(Router_d *router) +{ + m_router = router; + m_num_vcs = m_router->get_num_vcs(); + m_vc_per_vnet = m_router->get_vc_per_vnet(); + m_local_arbiter_activity = 0; + m_global_arbiter_activity = 0; +} + +void VCallocator_d::init() +{ + m_input_unit = m_router->get_inputUnit_ref(); + m_output_unit = m_router->get_outputUnit_ref(); + + m_num_inports = m_router->get_num_inports(); + m_num_outports = m_router->get_num_outports(); + m_round_robin_invc.setSize(m_num_inports); + m_round_robin_outvc.setSize(m_num_outports); + m_outvc_req.setSize(m_num_outports); + m_outvc_is_req.setSize(m_num_outports); + + for(int i = 0; i < m_num_inports; i++) + { + m_round_robin_invc[i].setSize(m_num_vcs); + + for(int j = 0; j < m_num_vcs; j++) + { + m_round_robin_invc[i][j] = 0; + } + } + + for(int i = 0; i < m_num_outports; i++) + { + m_round_robin_outvc[i].setSize(m_num_vcs); + m_outvc_req[i].setSize(m_num_vcs); + m_outvc_is_req[i].setSize(m_num_vcs); + + for(int j = 0; j < m_num_vcs; j++) + { + m_round_robin_outvc[i][j].first = 0; + m_round_robin_outvc[i][j].second = 0; + m_outvc_is_req[i][j] = false; + + m_outvc_req[i][j].setSize(m_num_inports); + + for(int k = 0; k < m_num_inports; k++) + { + m_outvc_req[i][j][k].setSize(m_num_vcs); + for(int l = 0; l < m_num_vcs; l++) + { + m_outvc_req[i][j][k][l] = false; + } + } + } + } +} + +void VCallocator_d::clear_request_vector() +{ + for(int i = 0; i < m_num_outports; i++) + { + for(int j = 0; j < m_num_vcs; j++) + { + if(!m_outvc_is_req[i][j]) + continue; + m_outvc_is_req[i][j] = false; + for(int k = 0; k < m_num_inports; k++) + { + for(int l = 0; l < m_num_vcs; l++) + { + m_outvc_req[i][j][k][l] = false; + } + } + } + } +} + +void VCallocator_d::wakeup() +{ + arbitrate_invcs(); // First stage of allocation + arbitrate_outvcs(); // Second stage of allocation + + clear_request_vector(); + check_for_wakeup(); +} + +bool VCallocator_d::is_invc_candidate(int inport_iter, int invc_iter) +{ + int outport = m_input_unit[inport_iter]->get_route(invc_iter); + int vnet = get_vnet(invc_iter); + int t_enqueue_time = m_input_unit[inport_iter]->get_enqueue_time(invc_iter); + + int invc_base = vnet*m_vc_per_vnet; + + if((m_router->get_net_ptr())->isVNetOrdered(vnet)) + { + for(int vc_offset = 0; vc_offset < m_vc_per_vnet; vc_offset++) + { + int temp_vc = invc_base + vc_offset; + if(m_input_unit[inport_iter]->need_stage(temp_vc, VC_AB_, VA_) && (m_input_unit[inport_iter]->get_route(temp_vc) == outport) && (m_input_unit[inport_iter]->get_enqueue_time(temp_vc) < t_enqueue_time)) + { + return false; + } + } + } + return true; +} + +void VCallocator_d::select_outvc(int inport_iter, int invc_iter) +{ + int outport = m_input_unit[inport_iter]->get_route(invc_iter); + int vnet = get_vnet(invc_iter); + int outvc_base = vnet*m_vc_per_vnet; + int num_vcs_per_vnet = m_vc_per_vnet; + + int outvc_offset = m_round_robin_invc[inport_iter][invc_iter]; + m_round_robin_invc[inport_iter][invc_iter]++; + + if(m_round_robin_invc[inport_iter][invc_iter] >= num_vcs_per_vnet) + m_round_robin_invc[inport_iter][invc_iter] = 0; + + for(int outvc_offset_iter = 0; outvc_offset_iter < num_vcs_per_vnet; outvc_offset_iter++) + { + outvc_offset++; + if(outvc_offset >= num_vcs_per_vnet) + outvc_offset = 0; + int outvc = outvc_base + outvc_offset; + if(m_output_unit[outport]->is_vc_idle(outvc)) + { + m_local_arbiter_activity++; + m_outvc_req[outport][outvc][inport_iter][invc_iter] = true; + if(!m_outvc_is_req[outport][outvc]) + m_outvc_is_req[outport][outvc] = true; + return; // out vc acquired + } + } +} + +void VCallocator_d::arbitrate_invcs() +{ + for(int inport_iter = 0; inport_iter < m_num_inports; inport_iter++) + { + for(int invc_iter = 0; invc_iter < m_num_vcs; invc_iter++) + { + if(m_input_unit[inport_iter]->need_stage(invc_iter, VC_AB_, VA_)) + { + if(!is_invc_candidate(inport_iter, invc_iter)) + continue; + + select_outvc(inport_iter, invc_iter); + } + } + } +} + +void VCallocator_d::arbitrate_outvcs() +{ + for(int outport_iter = 0; outport_iter < m_num_outports; outport_iter++) + { + for(int outvc_iter = 0; outvc_iter < m_num_vcs; outvc_iter++) + { + if(!m_outvc_is_req[outport_iter][outvc_iter]) // No requests for this outvc in this cycle + continue; + + int inport = m_round_robin_outvc[outport_iter][outvc_iter].first; + int invc_offset = m_round_robin_outvc[outport_iter][outvc_iter].second; + int vnet = get_vnet(outvc_iter); + int invc_base = vnet*m_vc_per_vnet; + int num_vcs_per_vnet = m_vc_per_vnet; + + m_round_robin_outvc[outport_iter][outvc_iter].second++; + if(m_round_robin_outvc[outport_iter][outvc_iter].second >= num_vcs_per_vnet) + { + m_round_robin_outvc[outport_iter][outvc_iter].second = 0; + m_round_robin_outvc[outport_iter][outvc_iter].first++; + if(m_round_robin_outvc[outport_iter][outvc_iter].first >= m_num_inports) + m_round_robin_outvc[outport_iter][outvc_iter].first = 0; + } + for(int in_iter = 0; in_iter < m_num_inports*num_vcs_per_vnet; in_iter++) + { + invc_offset++; + if(invc_offset >= num_vcs_per_vnet) + { + invc_offset = 0; + inport++; + if(inport >= m_num_inports) + inport = 0; + } + int invc = invc_base + invc_offset; + if(m_outvc_req[outport_iter][outvc_iter][inport][invc]) + { + m_global_arbiter_activity++; + m_input_unit[inport]->grant_vc(invc, outvc_iter); + m_output_unit[outport_iter]->update_vc(outvc_iter, inport, invc); + m_router->swarb_req(); + break; + } + } + } + } +} + +int VCallocator_d::get_vnet(int invc) +{ + for(int i = 0; i < NUMBER_OF_VIRTUAL_NETWORKS; i++) + { + if(invc >= (i*m_vc_per_vnet) && invc < ((i+1)*m_vc_per_vnet)) + { + return i; + } + } + ERROR_MSG("Could not determine vc"); + return -1; +} + +void VCallocator_d::check_for_wakeup() +{ + for(int i = 0; i < m_num_inports; i++) + { + for(int j = 0; j < m_num_vcs; j++) + { + if(m_input_unit[i]->need_stage_nextcycle(j, VC_AB_, VA_)) + { + g_eventQueue_ptr->scheduleEvent(this, 1); + return; + } + } + } +} |