WireBuffer.cc revision 11116:d6fb95dbf3e2
1/* 2 * Copyright (c) 2010 Advanced Micro Devices, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Author: Lisa Hsu 29 * 30 */ 31 32#include <algorithm> 33#include <functional> 34 35#include "base/cprintf.hh" 36#include "base/stl_helpers.hh" 37#include "mem/ruby/structures/WireBuffer.hh" 38#include "mem/ruby/system/RubySystem.hh" 39 40using namespace std; 41 42// Output operator definition 43 44ostream& 45operator<<(ostream& out, const WireBuffer& obj) 46{ 47 obj.print(out); 48 out << flush; 49 return out; 50} 51 52 53// **************************************************************** 54 55// CONSTRUCTOR 56WireBuffer::WireBuffer(const Params *p) 57 : SimObject(p) 58{ 59 m_msg_counter = 0; 60} 61 62void 63WireBuffer::init() 64{ 65} 66 67WireBuffer::~WireBuffer() 68{ 69} 70 71void 72WireBuffer::enqueue(MsgPtr message, Tick current_time, Tick delta) 73{ 74 m_msg_counter++; 75 Tick arrival_time = current_time + delta; 76 assert(arrival_time > current_time); 77 78 Message* msg_ptr = message.get(); 79 msg_ptr->setLastEnqueueTime(arrival_time); 80 m_message_queue.push_back(message); 81 if (m_consumer_ptr != NULL) { 82 m_consumer_ptr-> 83 scheduleEventAbsolute(arrival_time); 84 } else { 85 panic("No Consumer for WireBuffer! %s\n", *this); 86 } 87} 88 89void 90WireBuffer::dequeue(Tick current_time) 91{ 92 assert(isReady(current_time)); 93 pop_heap(m_message_queue.begin(), m_message_queue.end(), 94 greater<MsgPtr>()); 95 m_message_queue.pop_back(); 96} 97 98const Message* 99WireBuffer::peek() 100{ 101 Message* msg_ptr = m_message_queue.front().get(); 102 assert(msg_ptr != NULL); 103 return msg_ptr; 104} 105 106void 107WireBuffer::recycle(Tick current_time, Tick recycle_latency) 108{ 109 // Because you don't want anything reordered, make sure the recycle latency 110 // is just 1 cycle. As a result, you really want to use this only in 111 // Wire-like situations because you don't want to deadlock as a result of 112 // being stuck behind something if you're not actually supposed to. 113 assert(isReady(current_time)); 114 MsgPtr node = m_message_queue.front(); 115 pop_heap(m_message_queue.begin(), m_message_queue.end(), greater<MsgPtr>()); 116 117 Tick future_time = current_time + recycle_latency; 118 node->setLastEnqueueTime(future_time); 119 120 m_message_queue.back() = node; 121 push_heap(m_message_queue.begin(), m_message_queue.end(), 122 greater<MsgPtr>()); 123 m_consumer_ptr-> 124 scheduleEventAbsolute(future_time); 125} 126 127bool 128WireBuffer::isReady(Tick current_time) 129{ 130 return ((!m_message_queue.empty()) && 131 (m_message_queue.front()->getLastEnqueueTime() <= current_time)); 132} 133 134void 135WireBuffer::print(ostream& out) const 136{ 137} 138 139void 140WireBuffer::wakeup() 141{ 142} 143 144WireBuffer * 145RubyWireBufferParams::create() 146{ 147 return new WireBuffer(this); 148} 149