Intesim2 Integration

Details: See Review 80001 https://gpgpu-sim-code-review.appspot.com/80001/

[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 16747]

1 files changed, 223 insertions, 0 deletions

diff --git a/src/intersim2/vc.cpp b/src/intersim2/vc.cpp
new file mode 100644
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+++ b/src/intersim2/vc.cpp
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+// $Id: vc.cpp 5188 2012-08-30 00:31:31Z dub $
+
+/*
+ Copyright (c) 2007-2012, Trustees of The Leland Stanford Junior 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.
+
+ 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.
+*/
+
+/*vc.cpp
+ *
+ *this class describes a virtual channel in a router
+ *it includes buffers and virtual channel state and controls
+ *
+ *This class calls the routing functions
+ */
+
+#include <limits>
+#include <sstream>
+
+#include "globals.hpp"
+#include "booksim.hpp"
+#include "vc.hpp"
+
+const char * const VC::VCSTATE[] = {"idle",
+				    "routing",
+				    "vc_alloc",
+				    "active"};
+
+VC::VC( const Configuration& config, int outputs, 
+	Module *parent, const string& name )
+  : Module( parent, name ), 
+    _state(idle), _out_port(-1), _out_vc(-1), _pri(0), _watched(false), 
+    _expected_pid(-1), _last_id(-1), _last_pid(-1)
+{
+  _lookahead_routing = !config.GetInt("routing_delay");
+  _route_set = _lookahead_routing ? NULL : new OutputSet( );
+
+  string priority = config.GetStr( "priority" );
+  if ( priority == "local_age" ) {
+    _pri_type = local_age_based;
+  } else if ( priority == "queue_length" ) {
+    _pri_type = queue_length_based;
+  } else if ( priority == "hop_count" ) {
+    _pri_type = hop_count_based;
+  } else if ( priority == "none" ) {
+    _pri_type = none;
+  } else {
+    _pri_type = other;
+  }
+
+  _priority_donation = config.GetInt("vc_priority_donation");
+}
+
+VC::~VC()
+{
+  if(!_lookahead_routing) {
+    delete _route_set;
+  }
+}
+
+void VC::AddFlit( Flit *f )
+{
+  assert(f);
+
+  if(_expected_pid >= 0) {
+    if(f->pid != _expected_pid) {
+      ostringstream err;
+      err << "Received flit " << f->id << " with unexpected packet ID: " << f->pid 
+	  << " (expected: " << _expected_pid << ")";
+      Error(err.str());
+    } else if(f->tail) {
+      _expected_pid = -1;
+    }
+  } else if(!f->tail) {
+    _expected_pid = f->pid;
+  }
+    
+  // update flit priority before adding to VC buffer
+  if(_pri_type == local_age_based) {
+    f->pri = numeric_limits<int>::max() - GetSimTime();
+    assert(f->pri >= 0);
+  } else if(_pri_type == hop_count_based) {
+    f->pri = f->hops;
+    assert(f->pri >= 0);
+  }
+
+  _buffer.push_back(f);
+  UpdatePriority();
+}
+
+Flit *VC::RemoveFlit( )
+{
+  Flit *f = NULL;
+  if ( !_buffer.empty( ) ) {
+    f = _buffer.front( );
+    _buffer.pop_front( );
+    _last_id = f->id;
+    _last_pid = f->pid;
+    UpdatePriority();
+  } else {
+    Error("Trying to remove flit from empty buffer.");
+  }
+  return f;
+}
+
+
+
+void VC::SetState( eVCState s )
+{
+  Flit * f = FrontFlit();
+  
+  if(f && f->watch)
+    *gWatchOut << GetSimTime() << " | " << FullName() << " | "
+		<< "Changing state from " << VC::VCSTATE[_state]
+		<< " to " << VC::VCSTATE[s] << "." << endl;
+  
+  _state = s;
+}
+
+const OutputSet *VC::GetRouteSet( ) const
+{
+  return _route_set;
+}
+
+void VC::SetRouteSet( OutputSet * output_set )
+{
+  _route_set = output_set;
+  _out_port = -1;
+  _out_vc = -1;
+}
+
+void VC::SetOutput( int port, int vc )
+{
+  _out_port = port;
+  _out_vc   = vc;
+}
+
+void VC::UpdatePriority()
+{
+  if(_buffer.empty()) return;
+  if(_pri_type == queue_length_based) {
+    _pri = _buffer.size();
+  } else if(_pri_type != none) {
+    Flit * f = _buffer.front();
+    if((_pri_type != local_age_based) && _priority_donation) {
+      Flit * df = f;
+      for(size_t i = 1; i < _buffer.size(); ++i) {
+	Flit * bf = _buffer[i];
+	if(bf->pri > df->pri) df = bf;
+      }
+      if((df != f) && (df->watch || f->watch)) {
+	*gWatchOut << GetSimTime() << " | " << FullName() << " | "
+		    << "Flit " << df->id
+		    << " donates priority to flit " << f->id
+		    << "." << endl;
+      }
+      f = df;
+    }
+    if(f->watch)
+      *gWatchOut << GetSimTime() << " | " << FullName() << " | "
+		  << "Flit " << f->id
+		  << " sets priority to " << f->pri
+		  << "." << endl;
+    _pri = f->pri;
+  }
+}
+
+
+void VC::Route( tRoutingFunction rf, const Router* router, const Flit* f, int in_channel )
+{
+  rf( router, f, in_channel, _route_set, false );
+  _out_port = -1;
+  _out_vc = -1;
+}
+
+// ==== Debug functions ====
+
+void VC::SetWatch( bool watch )
+{
+  _watched = watch;
+}
+
+bool VC::IsWatched( ) const
+{
+  return _watched;
+}
+
+void VC::Display( ostream & os ) const
+{
+  if ( _state != VC::idle ) {
+    os << FullName() << ": "
+       << " state: " << VCSTATE[_state];
+    if(_state == VC::active) {
+      os << " out_port: " << _out_port
+	 << " out_vc: " << _out_vc;
+    }
+    os << " fill: " << _buffer.size();
+    if(!_buffer.empty()) {
+      os << " front: " << _buffer.front()->id;
+    }
+    os << " pri: " << _pri;
+    os << endl;
+  }
+}