From 46cce440be4999cfdedebbf190c83570ba9f1b49 Mon Sep 17 00:00:00 2001
From: Tushar Krishna <tushar@csail.mit.edu>
Date: Mon, 21 Mar 2011 22:51:59 -0400
Subject: This patch makes garnet use the info about active and inactive vnets
 during allocation and power estimations etc

---
 .../garnet/flexible-pipeline/GarnetNetwork.cc      |  3 ++
 .../network/garnet/flexible-pipeline/Router.cc     | 41 ++++++++++++++++++----
 .../network/garnet/flexible-pipeline/Router.hh     |  1 +
 3 files changed, 39 insertions(+), 6 deletions(-)

(limited to 'src/mem/ruby/network/garnet/flexible-pipeline')

diff --git a/src/mem/ruby/network/garnet/flexible-pipeline/GarnetNetwork.cc b/src/mem/ruby/network/garnet/flexible-pipeline/GarnetNetwork.cc
index 8280360c4..205eb1472 100644
--- a/src/mem/ruby/network/garnet/flexible-pipeline/GarnetNetwork.cc
+++ b/src/mem/ruby/network/garnet/flexible-pipeline/GarnetNetwork.cc
@@ -260,6 +260,9 @@ GarnetNetwork::printStats(ostream& out) const
     out << "-------------" << endl;
 
     for (int i = 0; i < m_vcs_per_class*m_virtual_networks; i++) {
+        if (!m_in_use[i/m_vcs_per_class])
+            continue;
+
         average_vc_load[i] = (double(average_vc_load[i]) /
             (double(g_eventQueue_ptr->getTime()) - m_ruby_start));
         out << "Average VC Load [" << i << "] = " << average_vc_load[i] <<
diff --git a/src/mem/ruby/network/garnet/flexible-pipeline/Router.cc b/src/mem/ruby/network/garnet/flexible-pipeline/Router.cc
index fef6b00a1..4a0d59973 100644
--- a/src/mem/ruby/network/garnet/flexible-pipeline/Router.cc
+++ b/src/mem/ruby/network/garnet/flexible-pipeline/Router.cc
@@ -156,14 +156,27 @@ Router::vc_arbitrate()
         if (inport >= m_in_link.size())
             inport = 0;
         int invc = m_round_robin_invc[inport];
-        m_round_robin_invc[inport]++;
 
-        if (m_round_robin_invc[inport] >= m_num_vcs)
-            m_round_robin_invc[inport] = 0;
+        int next_round_robin_invc = invc;
+        do {
+            next_round_robin_invc++;
+
+            if (next_round_robin_invc >= m_num_vcs)
+                next_round_robin_invc = 0;
+
+        } while (!(m_net_ptr->validVirtualNetwork(
+                   get_vnet(next_round_robin_invc))));
+
+        m_round_robin_invc[inport] = next_round_robin_invc;
+
         for (int vc_iter = 0; vc_iter < m_num_vcs; vc_iter++) {
             invc++;
             if (invc >= m_num_vcs)
                 invc = 0;
+
+            if (!(m_net_ptr->validVirtualNetwork(get_vnet(invc))))
+                continue;
+
             InVcState *in_vc_state = m_in_vc_state[inport][invc];
 
             if (in_vc_state->isInState(VC_AB_, g_eventQueue_ptr->getTime())) {
@@ -330,9 +343,17 @@ Router::scheduleOutputLinks()
 {
     for (int port = 0; port < m_out_link.size(); port++) {
         int vc_tolookat = m_vc_round_robin[port];
-        m_vc_round_robin[port]++;
-        if (m_vc_round_robin[port] == m_num_vcs)
-            m_vc_round_robin[port] = 0;
+
+        int next_round_robin_vc_tolookat = vc_tolookat;
+        do {
+            next_round_robin_vc_tolookat++;
+
+            if (next_round_robin_vc_tolookat == m_num_vcs)
+                next_round_robin_vc_tolookat = 0;
+        } while (!(m_net_ptr->validVirtualNetwork(
+                   get_vnet(next_round_robin_vc_tolookat))));
+
+        m_vc_round_robin[port] = next_round_robin_vc_tolookat;
 
         for (int i = 0; i < m_num_vcs; i++) {
             vc_tolookat++;
@@ -358,6 +379,14 @@ Router::scheduleOutputLinks()
     }
 }
 
+int
+Router::get_vnet(int vc)
+{
+    int vnet = vc/m_vc_per_vnet;
+    assert(vnet < m_virtual_networks);
+    return vnet;
+}
+
 void
 Router::checkReschedule()
 {
diff --git a/src/mem/ruby/network/garnet/flexible-pipeline/Router.hh b/src/mem/ruby/network/garnet/flexible-pipeline/Router.hh
index 20a4abd54..8f240551c 100644
--- a/src/mem/ruby/network/garnet/flexible-pipeline/Router.hh
+++ b/src/mem/ruby/network/garnet/flexible-pipeline/Router.hh
@@ -62,6 +62,7 @@ class Router : public FlexibleConsumer
     void grant_vc(int out_port, int vc, Time grant_time);
     void release_vc(int out_port, int vc, Time release_time);
     void vc_arbitrate();
+    int get_vnet(int vc);
 
     void printConfig(std::ostream& out) const;
     void print(std::ostream& out) const;
-- 
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