From bb7ed349e146ea6b9ef1100d81fa7ac5ef2751cb Mon Sep 17 00:00:00 2001
From: Mahmoud <abdallm@purdue.edu>
Date: Thu, 11 Apr 2019 19:53:23 -0400
Subject: adding local xbar and fast execution mode

---
 src/gpgpu-sim/local_interconnect.cc | 277 ++++++++++++++++++++++++++++++++++++
 1 file changed, 277 insertions(+)
 create mode 100644 src/gpgpu-sim/local_interconnect.cc

(limited to 'src/gpgpu-sim/local_interconnect.cc')

diff --git a/src/gpgpu-sim/local_interconnect.cc b/src/gpgpu-sim/local_interconnect.cc
new file mode 100644
index 0000000..1d93fe6
--- /dev/null
+++ b/src/gpgpu-sim/local_interconnect.cc
@@ -0,0 +1,277 @@
+// Copyright (c) 2009-2013, Tor M. Aamodt, Dongdong Li, Ali Bakhoda
+// The University of British Columbia
+// 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 University of British Columbia 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 HOLDER 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.
+
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <iomanip>
+#include <cmath>
+#include <utility>
+#include <algorithm>
+
+#include "local_interconnect.h"
+#include "mem_fetch.h"
+
+xbar_router::xbar_router(unsigned router_id, unsigned n_shader, unsigned n_mem, unsigned m_in_buffer_limit, unsigned m_out_buffer_limit)
+{
+	m_id=router_id;
+   _n_mem = n_mem;
+   _n_shader = n_shader;
+   total_nodes = n_shader+n_mem;
+   in_buffers.resize(total_nodes);
+   out_buffers.resize(total_nodes);
+   next_node=0;
+   in_buffer_limit = m_in_buffer_limit;
+   out_buffer_limit = m_out_buffer_limit;
+
+   cycles = 0;
+   conflicts= 0;
+   out_buffer_full=0;
+   packets_num=0;
+}
+
+
+xbar_router::~xbar_router()
+{
+
+}
+
+void xbar_router::Push(unsigned input_deviceID, unsigned output_deviceID, void* data, unsigned int size)
+{
+	assert(input_deviceID < total_nodes);
+	in_buffers[input_deviceID].push(Packet(data, output_deviceID));
+	packets_num++;
+}
+
+void* xbar_router::Pop(unsigned ouput_deviceID)
+{
+	assert(ouput_deviceID < total_nodes);
+	void* data = NULL;
+
+	if(!out_buffers[ouput_deviceID].empty()) {
+		data = out_buffers[ouput_deviceID].front().data;
+		out_buffers[ouput_deviceID].pop();
+	}
+
+	return data;
+}
+
+
+bool xbar_router::Has_Buffer_In(unsigned input_deviceID, unsigned size) const{
+
+	assert(input_deviceID < total_nodes);
+	return (in_buffers[input_deviceID].size() + size <= in_buffer_limit);
+
+}
+
+bool xbar_router::Has_Buffer_Out(unsigned output_deviceID, unsigned size) const{
+	return (out_buffers[output_deviceID].size() + size <= out_buffer_limit);
+}
+
+void xbar_router::Advance() {
+	cycles++;
+
+	vector<bool> issued(total_nodes, false);
+
+	for(unsigned i=0; i<total_nodes; ++i){
+		unsigned node_id = (i+next_node)%total_nodes;
+
+		if(!in_buffers[node_id].empty()) {
+			Packet _packet = in_buffers[node_id].front();
+			//ensure that the outbuffer has space and not issued before in this cycle
+			if(Has_Buffer_Out(_packet.output_deviceID, 1)){
+				if(!issued[_packet.output_deviceID]) {
+					out_buffers[_packet.output_deviceID].push(_packet);
+					in_buffers[node_id].pop();
+					issued[_packet.output_deviceID]=true;
+				}
+				else
+					conflicts++;
+			}
+			else
+				out_buffer_full++;
+		}
+	}
+
+	next_node = (++next_node % total_nodes);
+}
+
+bool xbar_router::Busy() const {
+
+	for(unsigned i=0; i<total_nodes; ++i){
+		if(!in_buffers[i].empty())
+			return true;
+
+		if(!out_buffers[i].empty())
+			return true;
+	}
+	return false;
+}
+
+
+////////////////////////////////////////////////////
+/////////////LocalInterconnect/////////////////////
+
+//assume all the packets are one flit
+#define LOCAL_INCT_FLIT_SIZE 40
+
+LocalInterconnect* LocalInterconnect::New(const struct inct_config& m_localinct_config)
+{
+
+  LocalInterconnect* icnt_interface = new LocalInterconnect(m_localinct_config);
+
+  return icnt_interface;
+}
+
+LocalInterconnect::LocalInterconnect(const struct inct_config& m_localinct_config): m_inct_config(m_localinct_config)
+{
+	n_shader=0;
+	n_mem=0;
+	n_subnets = m_localinct_config.subnets;
+
+}
+
+LocalInterconnect::~LocalInterconnect()
+{
+  for (int i=0; i<m_inct_config.subnets; ++i) {
+    delete net[i];
+  }
+}
+
+void LocalInterconnect::CreateInterconnect(unsigned m_n_shader, unsigned m_n_mem)
+{
+  n_shader = m_n_shader;
+  n_mem = m_n_mem;
+
+  net.resize(n_subnets);
+  for (unsigned i = 0; i < n_subnets; ++i) {
+    net[i] = new xbar_router( i, m_n_shader, m_n_mem, m_inct_config.in_buffer_limit, m_inct_config.out_buffer_limit );
+  }
+
+}
+
+
+void LocalInterconnect::Init() {
+
+	//empty
+	//there is nothing to do
+
+}
+
+void LocalInterconnect::Push(unsigned input_deviceID, unsigned output_deviceID, void* data, unsigned int size){
+
+	unsigned subnet;
+	  if (n_subnets == 1) {
+		subnet = 0;
+	  } else {
+		if (input_deviceID < n_shader ) {
+		  subnet = 0;
+		} else {
+		  subnet = 1;
+		}
+	  }
+
+	 // it should have free buffer
+	  //assume all the packets have size of one
+	  //no flits are implemented
+	  assert(net[subnet]->Has_Buffer_In(input_deviceID, 1));
+
+	  net[subnet]->Push(input_deviceID, output_deviceID, data, size);
+
+}
+
+void* LocalInterconnect::Pop(unsigned ouput_deviceID){
+
+	// 0-_n_shader-1 indicates reply(network 1), otherwise request(network 0)
+	  int subnet = 0;
+	  if (ouput_deviceID < n_shader)
+	    subnet = 1;
+
+	  return net[subnet]->Pop(ouput_deviceID);
+
+}
+
+void LocalInterconnect::Advance(){
+
+	for (unsigned i = 0; i < n_subnets; ++i) {
+	    net[i]->Advance();
+	  }
+
+}
+
+bool  LocalInterconnect::Busy() const{
+
+	for (unsigned i = 0; i < n_subnets; ++i) {
+		 if(net[i]->Busy())
+			 return true;
+	}
+	return false;
+}
+
+bool  LocalInterconnect::HasBuffer(unsigned deviceID, unsigned int size) const{
+
+	 bool has_buffer = false;
+
+	 has_buffer = net[0]->Has_Buffer_In(deviceID, size);
+
+	  if ((n_subnets>1) && deviceID >= n_shader) // deviceID is memory node
+			 has_buffer = net[1]->Has_Buffer_In(deviceID, size);
+
+	  return has_buffer;
+
+}
+
+void  LocalInterconnect::DisplayStats() const{
+
+	cout<<"Req_Network_injected_packets_num = "<<net[0]->packets_num<<endl;
+	cout<<"Req_Network_cycles = "<<net[0]->cycles<<endl;
+	cout<<"Req_Network_injected_packets_per_cycle = "<<(float)(net[0]->packets_num) / (net[0]->cycles)<<endl;
+	cout<<"Req_Network_conflicts_per_cycle = "<<(float)(net[0]->conflicts) / (net[0]->cycles)<<endl;
+	cout<<"Req_Network_out_buffer_full_per_cycle = "<<(float)(net[0]->out_buffer_full) / (net[0]->cycles)<<endl;
+
+	cout<<endl;
+	cout<<"Reply_Network_injected_packets_num = "<<net[1]->packets_num<<endl;
+	cout<<"ReplyNetwork_cycles = "<<net[1]->cycles<<endl;
+	cout<<"ReplyNetwork_injected_packets_per_cycle = "<<(float)(net[1]->packets_num) / (net[1]->cycles)<<endl;
+	cout<<"ReplyNetwork_conflicts_per_cycle = "<<(float)(net[1]->conflicts) / (net[1]->cycles)<<endl;
+	cout<<"ReplyNetwork_out_buffer_full_per_cycle = "<<(float)(net[1]->out_buffer_full) / (net[1]->cycles)<<endl;
+
+}
+
+void  LocalInterconnect::DisplayOverallStats() const{
+
+}
+
+unsigned  LocalInterconnect::GetFlitSize() const{
+	return LOCAL_INCT_FLIT_SIZE;
+}
+
+void  LocalInterconnect::DisplayState(FILE* fp) const{
+
+	  fprintf(fp, "GPGPU-Sim uArch: ICNT:Display State: Under implementation\n");
+}
+
-- 
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