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/*
* Copyright (c) 2020 Inria
* Copyright (c) 2016 Georgia Institute of Technology
* Copyright (c) 2008 Princeton University
* 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.
*
* Authors: Niket Agarwal
* Tushar Krishna
*/
#include "mem/ruby/network/garnet2.0/CrossbarSwitch.hh"
#include "debug/RubyNetwork.hh"
#include "mem/ruby/network/garnet2.0/OutputUnit.hh"
#include "mem/ruby/network/garnet2.0/Router.hh"
CrossbarSwitch::CrossbarSwitch(Router *router)
: Consumer(router)
{
m_router = router;
m_num_vcs = m_router->get_num_vcs();
m_crossbar_activity = 0;
}
void
CrossbarSwitch::init()
{
m_output_unit = m_router->get_outputUnit_ref();
m_num_inports = m_router->get_num_inports();
m_switch_buffer.resize(m_num_inports);
for (int i = 0; i < m_num_inports; i++) {
m_switch_buffer[i].reset(new flitBuffer());
}
}
/*
* The wakeup function of the CrossbarSwitch loops through all input ports,
* and sends the winning flit (from SA) out of its output port on to the
* output link. The output link is scheduled for wakeup in the next cycle.
*/
void
CrossbarSwitch::wakeup()
{
DPRINTF(RubyNetwork, "CrossbarSwitch at Router %d woke up "
"at time: %lld\n",
m_router->get_id(), m_router->curCycle());
for (int inport = 0; inport < m_num_inports; inport++) {
if (!m_switch_buffer[inport]->isReady(m_router->curCycle()))
continue;
flit *t_flit = m_switch_buffer[inport]->peekTopFlit();
if (t_flit->is_stage(ST_, m_router->curCycle())) {
int outport = t_flit->get_outport();
// flit performs LT_ in the next cycle
t_flit->advance_stage(LT_, m_router->curCycle() + Cycles(1));
t_flit->set_time(m_router->curCycle() + Cycles(1));
// This will take care of waking up the Network Link
// in the next cycle
m_output_unit[outport]->insert_flit(t_flit);
m_switch_buffer[inport]->getTopFlit();
m_crossbar_activity++;
}
}
}
uint32_t
CrossbarSwitch::functionalWrite(Packet *pkt)
{
uint32_t num_functional_writes = 0;
for (uint32_t i = 0; i < m_switch_buffer.size(); ++i) {
num_functional_writes += m_switch_buffer[i]->functionalWrite(pkt);
}
return num_functional_writes;
}
void
CrossbarSwitch::resetStats()
{
m_crossbar_activity = 0;
}
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