1/* 2 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood 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 29#include <algorithm> 30 31#include "base/cast.hh" 32#include "debug/RubyNetwork.hh" 33#include "mem/ruby/buffers/MessageBuffer.hh" 34#include "mem/ruby/network/simple/PerfectSwitch.hh" 35#include "mem/ruby/network/simple/SimpleNetwork.hh" 36#include "mem/ruby/network/simple/Switch.hh" 37#include "mem/ruby/slicc_interface/NetworkMessage.hh" 38 39using namespace std; 40 41const int PRIORITY_SWITCH_LIMIT = 128; 42 43// Operator for helper class 44bool 45operator<(const LinkOrder& l1, const LinkOrder& l2) 46{ 47 return (l1.m_value < l2.m_value); 48} 49 50PerfectSwitch::PerfectSwitch(SwitchID sid, Switch *sw, uint32_t virt_nets) 51 : Consumer(sw) 52{ 53 m_switch_id = sid; 54 m_round_robin_start = 0; 55 m_wakeups_wo_switch = 0; 56 m_virtual_networks = virt_nets; 57} 58 59void 60PerfectSwitch::init(SimpleNetwork *network_ptr) 61{ 62 m_network_ptr = network_ptr; 63 64 for(int i = 0;i < m_virtual_networks;++i) 65 { 66 m_pending_message_count.push_back(0); 67 } 68} 69 70void 71PerfectSwitch::addInPort(const vector<MessageBuffer*>& in) 72{ 73 assert(in.size() == m_virtual_networks); 74 NodeID port = m_in.size(); 75 m_in.push_back(in); 76 77 for (int j = 0; j < m_virtual_networks; j++) { 78 m_in[port][j]->setConsumer(this); 79 80 string desc = csprintf("[Queue from port %s %s %s to PerfectSwitch]", 81 to_string(m_switch_id), to_string(port), to_string(j)); 82 m_in[port][j]->setDescription(desc); 83 m_in[port][j]->setIncomingLink(port); 84 m_in[port][j]->setVnet(j); 85 } 86} 87 88void 89PerfectSwitch::addOutPort(const vector<MessageBuffer*>& out, 90 const NetDest& routing_table_entry) 91{ 92 assert(out.size() == m_virtual_networks); 93 94 // Setup link order 95 LinkOrder l; 96 l.m_value = 0; 97 l.m_link = m_out.size(); 98 m_link_order.push_back(l); 99 100 // Add to routing table 101 m_out.push_back(out); 102 m_routing_table.push_back(routing_table_entry); 103} 104
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105void
106PerfectSwitch::clearRoutingTables()
107{
108 m_routing_table.clear();
109}
110
111void
112PerfectSwitch::clearBuffers()
113{
114 for (int i = 0; i < m_in.size(); i++){
115 for(int vnet = 0; vnet < m_virtual_networks; vnet++) {
116 m_in[i][vnet]->clear();
117 }
118 }
119
120 for (int i = 0; i < m_out.size(); i++){
121 for(int vnet = 0; vnet < m_virtual_networks; vnet++) {
122 m_out[i][vnet]->clear();
123 }
124 }
125}
126
127void
128PerfectSwitch::reconfigureOutPort(const NetDest& routing_table_entry)
129{
130 m_routing_table.push_back(routing_table_entry);
131}
132
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105PerfectSwitch::~PerfectSwitch() 106{ 107} 108 109void 110PerfectSwitch::wakeup() 111{ 112 MsgPtr msg_ptr; 113 114 // Give the highest numbered link priority most of the time 115 m_wakeups_wo_switch++; 116 int highest_prio_vnet = m_virtual_networks-1; 117 int lowest_prio_vnet = 0; 118 int decrementer = 1; 119 NetworkMessage* net_msg_ptr = NULL; 120 121 // invert priorities to avoid starvation seen in the component network 122 if (m_wakeups_wo_switch > PRIORITY_SWITCH_LIMIT) { 123 m_wakeups_wo_switch = 0; 124 highest_prio_vnet = 0; 125 lowest_prio_vnet = m_virtual_networks-1; 126 decrementer = -1; 127 } 128 129 // For all components incoming queues 130 for (int vnet = highest_prio_vnet; 131 (vnet * decrementer) >= (decrementer * lowest_prio_vnet); 132 vnet -= decrementer) { 133 134 // This is for round-robin scheduling 135 int incoming = m_round_robin_start; 136 m_round_robin_start++; 137 if (m_round_robin_start >= m_in.size()) { 138 m_round_robin_start = 0; 139 } 140 141 if(m_pending_message_count[vnet] > 0) { 142 // for all input ports, use round robin scheduling 143 for (int counter = 0; counter < m_in.size(); counter++) { 144 // Round robin scheduling 145 incoming++; 146 if (incoming >= m_in.size()) { 147 incoming = 0; 148 } 149 150 // temporary vectors to store the routing results 151 vector<LinkID> output_links; 152 vector<NetDest> output_link_destinations; 153 154 // Is there a message waiting? 155 while (m_in[incoming][vnet]->isReady()) { 156 DPRINTF(RubyNetwork, "incoming: %d\n", incoming); 157 158 // Peek at message 159 msg_ptr = m_in[incoming][vnet]->peekMsgPtr(); 160 net_msg_ptr = safe_cast<NetworkMessage*>(msg_ptr.get()); 161 DPRINTF(RubyNetwork, "Message: %s\n", (*net_msg_ptr)); 162 163 output_links.clear(); 164 output_link_destinations.clear(); 165 NetDest msg_dsts = 166 net_msg_ptr->getInternalDestination(); 167 168 // Unfortunately, the token-protocol sends some 169 // zero-destination messages, so this assert isn't valid 170 // assert(msg_dsts.count() > 0); 171 172 assert(m_link_order.size() == m_routing_table.size()); 173 assert(m_link_order.size() == m_out.size()); 174 175 if (m_network_ptr->getAdaptiveRouting()) { 176 if (m_network_ptr->isVNetOrdered(vnet)) { 177 // Don't adaptively route 178 for (int out = 0; out < m_out.size(); out++) { 179 m_link_order[out].m_link = out; 180 m_link_order[out].m_value = 0; 181 } 182 } else { 183 // Find how clogged each link is 184 for (int out = 0; out < m_out.size(); out++) { 185 int out_queue_length = 0; 186 for (int v = 0; v < m_virtual_networks; v++) { 187 out_queue_length += m_out[out][v]->getSize(); 188 } 189 int value = 190 (out_queue_length << 8) | (random() & 0xff); 191 m_link_order[out].m_link = out; 192 m_link_order[out].m_value = value; 193 } 194 195 // Look at the most empty link first 196 sort(m_link_order.begin(), m_link_order.end()); 197 } 198 } 199 200 for (int i = 0; i < m_routing_table.size(); i++) { 201 // pick the next link to look at 202 int link = m_link_order[i].m_link; 203 NetDest dst = m_routing_table[link]; 204 DPRINTF(RubyNetwork, "dst: %s\n", dst); 205 206 if (!msg_dsts.intersectionIsNotEmpty(dst)) 207 continue; 208 209 // Remember what link we're using 210 output_links.push_back(link); 211 212 // Need to remember which destinations need this 213 // message in another vector. This Set is the 214 // intersection of the routing_table entry and the 215 // current destination set. The intersection must 216 // not be empty, since we are inside "if" 217 output_link_destinations.push_back(msg_dsts.AND(dst)); 218 219 // Next, we update the msg_destination not to 220 // include those nodes that were already handled 221 // by this link 222 msg_dsts.removeNetDest(dst); 223 } 224 225 assert(msg_dsts.count() == 0); 226 //assert(output_links.size() > 0); 227 228 // Check for resources - for all outgoing queues 229 bool enough = true; 230 for (int i = 0; i < output_links.size(); i++) { 231 int outgoing = output_links[i]; 232 if (!m_out[outgoing][vnet]->areNSlotsAvailable(1)) 233 enough = false; 234 DPRINTF(RubyNetwork, "Checking if node is blocked ..." 235 "outgoing: %d, vnet: %d, enough: %d\n", 236 outgoing, vnet, enough); 237 } 238 239 // There were not enough resources 240 if (!enough) { 241 scheduleEvent(Cycles(1)); 242 DPRINTF(RubyNetwork, "Can't deliver message since a node " 243 "is blocked\n"); 244 DPRINTF(RubyNetwork, "Message: %s\n", (*net_msg_ptr)); 245 break; // go to next incoming port 246 } 247 248 MsgPtr unmodified_msg_ptr; 249 250 if (output_links.size() > 1) { 251 // If we are sending this message down more than 252 // one link (size>1), we need to make a copy of 253 // the message so each branch can have a different 254 // internal destination we need to create an 255 // unmodified MsgPtr because the MessageBuffer 256 // enqueue func will modify the message 257 258 // This magic line creates a private copy of the 259 // message 260 unmodified_msg_ptr = msg_ptr->clone(); 261 } 262 263 // Enqueue it - for all outgoing queues 264 for (int i=0; i<output_links.size(); i++) { 265 int outgoing = output_links[i]; 266 267 if (i > 0) { 268 // create a private copy of the unmodified 269 // message 270 msg_ptr = unmodified_msg_ptr->clone(); 271 } 272 273 // Change the internal destination set of the 274 // message so it knows which destinations this 275 // link is responsible for. 276 net_msg_ptr = safe_cast<NetworkMessage*>(msg_ptr.get()); 277 net_msg_ptr->getInternalDestination() = 278 output_link_destinations[i]; 279 280 // Enqeue msg 281 DPRINTF(RubyNetwork, "Enqueuing net msg from " 282 "inport[%d][%d] to outport [%d][%d].\n", 283 incoming, vnet, outgoing, vnet); 284 285 m_out[outgoing][vnet]->enqueue(msg_ptr); 286 } 287 288 // Dequeue msg 289 m_in[incoming][vnet]->pop(); 290 m_pending_message_count[vnet]--; 291 } 292 } 293 } 294 } 295} 296 297void 298PerfectSwitch::storeEventInfo(int info) 299{ 300 m_pending_message_count[info]++; 301} 302 303void
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332PerfectSwitch::printStats(std::ostream& out) const
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304PerfectSwitch::clearStats() |
305{
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334 out << "PerfectSwitch printStats" << endl;
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306}
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336
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307void
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338PerfectSwitch::clearStats()
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308PerfectSwitch::collateStats() |
309{ 310} 311
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312 |
313void 314PerfectSwitch::print(std::ostream& out) const 315{ 316 out << "[PerfectSwitch " << m_switch_id << "]"; 317}
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