ruby: garnet2.0

Revamped version of garnet with more optimized single-cycle routers,
more configurability, and cleaner code.

1 files changed, 112 insertions, 0 deletions

diff --git a/src/mem/ruby/network/garnet2.0/CrossbarSwitch.cc b/src/mem/ruby/network/garnet2.0/CrossbarSwitch.cc
new file mode 100644
index 000000000..340f56d61
--- /dev/null
+++ b/src/mem/ruby/network/garnet2.0/CrossbarSwitch.cc
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2008 Princeton University
+ * Copyright (c) 2016 Georgia Institute of Technology
+ * 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 copyright holders 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
+ * 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.
+ *
+ * Authors: Niket Agarwal
+ *          Tushar Krishna
+ */
+
+
+#include "mem/ruby/network/garnet2.0/CrossbarSwitch.hh"
+
+#include "base/stl_helpers.hh"
+#include "debug/RubyNetwork.hh"
+#include "mem/ruby/network/garnet2.0/OutputUnit.hh"
+#include "mem/ruby/network/garnet2.0/Router.hh"
+
+using m5::stl_helpers::deletePointers;
+
+CrossbarSwitch::CrossbarSwitch(Router *router)
+    : Consumer(router)
+{
+    m_router = router;
+    m_num_vcs = m_router->get_num_vcs();
+    m_crossbar_activity = 0;
+}
+
+CrossbarSwitch::~CrossbarSwitch()
+{
+    deletePointers(m_switch_buffer);
+}
+
+void
+CrossbarSwitch::init()
+{
+    m_output_unit = m_router->get_outputUnit_ref();
+
+    m_num_inports = m_router->get_num_inports();
+    m_switch_buffer.resize(m_num_inports);
+    for (int i = 0; i < m_num_inports; i++) {
+        m_switch_buffer[i] = new flitBuffer();
+    }
+}
+
+/*
+ * The wakeup function of the CrossbarSwitch loops through all input ports,
+ * and sends the winning flit (from SA) out of its output port on to the
+ * output link. The output link is scheduled for wakeup in the next cycle.
+ */
+
+void
+CrossbarSwitch::wakeup()
+{
+    DPRINTF(RubyNetwork, "CrossbarSwitch at Router %d woke up "
+            "at time: %lld\n",
+            m_router->get_id(), m_router->curCycle());
+
+    for (int inport = 0; inport < m_num_inports; inport++) {
+        if (!m_switch_buffer[inport]->isReady(m_router->curCycle()))
+            continue;
+
+        flit *t_flit = m_switch_buffer[inport]->peekTopFlit();
+        if (t_flit->is_stage(ST_, m_router->curCycle())) {
+            int outport = t_flit->get_outport();
+
+            // flit performs LT_ in the next cycle
+            t_flit->advance_stage(LT_, m_router->curCycle() + Cycles(1));
+            t_flit->set_time(m_router->curCycle() + Cycles(1));
+
+            // This will take care of waking up the Network Link
+            // in the next cycle
+            m_output_unit[outport]->insert_flit(t_flit);
+            m_switch_buffer[inport]->getTopFlit();
+            m_crossbar_activity++;
+        }
+    }
+}
+
+uint32_t
+CrossbarSwitch::functionalWrite(Packet *pkt)
+{
+   uint32_t num_functional_writes = 0;
+
+   for (uint32_t i = 0; i < m_switch_buffer.size(); ++i) {
+       num_functional_writes += m_switch_buffer[i]->functionalWrite(pkt);
+   }
+
+   return num_functional_writes;
+}