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 * Authors: Niket Agarwal
30 *          Tushar Krishna
31 */
32
33
34#include "mem/ruby/network/garnet2.0/VirtualChannel.hh"
35
36VirtualChannel::VirtualChannel(int id)
37    : m_enqueue_time(INFINITE_)
38{
39    m_id = id;
40    m_input_buffer = new flitBuffer();
41    m_vc_state.first = IDLE_;
42    m_vc_state.second = Cycles(0);
43    m_output_vc = -1;
44    m_output_port = -1;
45}
46
47VirtualChannel::~VirtualChannel()
48{
49    delete m_input_buffer;
50}
51
52void
53VirtualChannel::set_idle(Cycles curTime)
54{
55    m_vc_state.first = IDLE_;
56    m_vc_state.second = curTime;
57    m_enqueue_time = Cycles(INFINITE_);
58    m_output_port = -1;
59    m_output_vc = -1;
60}
61
62void
63VirtualChannel::set_active(Cycles curTime)
64{
65    m_vc_state.first = ACTIVE_;
66    m_vc_state.second = curTime;
67    m_enqueue_time = curTime;
68}
69
70bool
71VirtualChannel::need_stage(flit_stage stage, Cycles time)
72{
73    if (m_input_buffer->isReady(time)) {
74        assert(m_vc_state.first == ACTIVE_ && m_vc_state.second <= time);
75        flit *t_flit = m_input_buffer->peekTopFlit();
76        return(t_flit->is_stage(stage, time));
77    }
78    return false;
79}
80
81uint32_t
82VirtualChannel::functionalWrite(Packet *pkt)
83{
84    return m_input_buffer->functionalWrite(pkt);
85}
86