/*
 * 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
 */


#ifndef __MEM_RUBY_NETWORK_GARNET2_0_CROSSBARSWITCH_HH__
#define __MEM_RUBY_NETWORK_GARNET2_0_CROSSBARSWITCH_HH__

#include <iostream>
#include <memory>
#include <vector>

#include "mem/ruby/common/Consumer.hh"
#include "mem/ruby/network/garnet2.0/CommonTypes.hh"
#include "mem/ruby/network/garnet2.0/flitBuffer.hh"

class Router;
class OutputUnit;

class CrossbarSwitch : public Consumer
{
  public:
    CrossbarSwitch(Router *router);
    ~CrossbarSwitch() = default;
    void wakeup();
    void init();
    void print(std::ostream& out) const {};

    inline void update_sw_winner(int inport, flit *t_flit)
    { m_switch_buffer[inport]->insert(t_flit); }

    inline double get_crossbar_activity() { return m_crossbar_activity; }

    uint32_t functionalWrite(Packet *pkt);
    void resetStats();

  private:
    int m_num_vcs;
    int m_num_inports;
    double m_crossbar_activity;
    Router *m_router;
    std::vector<std::unique_ptr<flitBuffer>> m_switch_buffer;
    std::vector<OutputUnit *> m_output_unit;
};

#endif // __MEM_RUBY_NETWORK_GARNET2_0_CROSSBARSWITCH_HH__