ext: add the source code for DSENT

This patch adds a tool called DSENT to the ext/ directory.  DSENT
is a tool that models power and area for on-chip networks.  The next
patch adds a script for using the tool.

1 files changed, 131 insertions, 0 deletions

diff --git a/ext/dsent/configs/router.cfg b/ext/dsent/configs/router.cfg
new file mode 100644
index 000000000..2e68b7e2c
--- /dev/null
+++ b/ext/dsent/configs/router.cfg
@@ -0,0 +1,131 @@
+
+# Name of model to be built and evaluated
+ModelName                               = Router
+
+# Query string to choose what to evaluate (use '\' to enable multiline config)
+QueryString                             = \
+    Energy>>Router:WriteBuffer@0 \
+    Energy>>Router:ReadBuffer@0 \
+    Energy>>Router:TraverseCrossbar->Multicast1@0 \
+    Energy>>Router:ArbitrateSwitch->ArbitrateStage1@0 \
+    Energy>>Router:ArbitrateSwitch->ArbitrateStage2@0 \
+    Energy>>Router:DistributeClock@0 \
+    NddPower>>Router:Leakage@1 \
+    Area>>Router:Active@1 \
+
+
+# Injection rate (# flits per cycle per port), assuming that the router is not
+# saturated
+InjectionRate                           = 0.3
+# Evaluation string
+EvaluateString                          = \
+    ejection_rate   = $(NumberInputPorts) * $(InjectionRate) / $(NumberOutputPorts); \
+    buf_rd_dynamic  = $(Energy>>Router:ReadBuffer) * $(Frequency); \
+    buf_wr_dynamic  = $(Energy>>Router:WriteBuffer) * $(Frequency); \
+    buf_static      = $(NddPower>>Router->InputPort:Leakage) * $(NumberInputPorts) + ($(NddPower>>Router->PipelineReg0:Leakage) + $(NddPower>>Router->PipelineReg1:Leakage)) * $(NumberInputPorts) * $(NumberBitsPerFlit); \
+    xbar_o_dynamic  = $(Energy>>Router:TraverseCrossbar->Multicast1) * $(Frequency); \
+    xbar_static     = $(NddPower>>Router->Crossbar:Leakage) + $(NddPower>>Router->PipelineReg2_0:Leakage) * $(NumberOutputPorts) * $(NumberBitsPerFlit); \
+    sa_o_dynamic    = ($(Energy>>Router:ArbitrateSwitch->ArbitrateStage1) + $(Energy>>Router:ArbitrateSwitch->ArbitrateStage2)) * $(Frequency); \
+    sa_static       = $(NddPower>>Router->SwitchAllocator:Leakage); \
+    clock_o_dynamic = $(Energy>>Router:DistributeClock) * $(Frequency); \
+    clock_static    = $(NddPower>>Router->ClockTree:Leakage); \
+    buffer_dynamic  = buf_wr_dynamic * $(InjectionRate) * $(NumberInputPorts) + buf_rd_dynamic * ejection_rate * $(NumberOutputPorts); \
+    buffer_leakage  = buf_static; \
+    xbar_dynamic    = xbar_o_dynamic * ejection_rate * $(NumberOutputPorts); \
+    xbar_leakage    = xbar_static; \
+    sa_dynamic      = sa_o_dynamic * ejection_rate * $(NumberOutputPorts); \
+    sa_leakage      = sa_static; \
+    clock_dynamic   = clock_o_dynamic; \
+    clock_leakage   = clock_static; \
+    total_dynamic   = buffer_dynamic + xbar_dynamic + sa_dynamic + clock_dynamic; \
+    total_leakage   = buffer_leakage + xbar_leakage + sa_leakage + clock_leakage; \
+    buf_area        = ($(Area>>Router->InputPort:Active) + ($(Area>>Router->PipelineReg0:Active) + $(Area>>Router->PipelineReg1:Active)) * $(NumberBitsPerFlit)) * $(NumberInputPorts); \
+    xbar_area       = $(Area>>Router->Crossbar:Active) + $(Area>>Router->Crossbar_Sel_DFF:Active) + $(Area>>Router->PipelineReg2_0:Active) * $(NumberBitsPerFlit) * $(NumberOutputPorts); \
+    sa_area         = $(Area>>Router->SwitchAllocator:Active); \
+    other_area      = $(Area>>Router->ClockTree:Active); \
+    print "Buffer:"; \
+    print "    Dynamic power: " buffer_dynamic; \
+    print "    Leakage power: " buffer_leakage; \
+    print "Crossbar:"; \
+    print "    Dynamic power: " xbar_dynamic; \
+    print "    Leakage power: " xbar_leakage; \
+    print "Switch allocator:"; \
+    print "    Dynamic power: " sa_dynamic; \
+    print "    Leakage power: " sa_leakage; \
+    print "Clock:"; \
+    print "    Dynamic power: " clock_dynamic; \
+    print "    Leakage power: " clock_leakage; \
+    print "Total:"; \
+    print "    Dynamic power: " total_dynamic; \
+    print "    Leakage power: " $(NddPower>>Router:Leakage); \
+    print "Area:"; \
+    print "    Buffer:           " buf_area; \
+    print "    Crossbar:         " xbar_area; \
+    print "    Switch allocator: " sa_area; \
+    print "    Other:            " other_area; \
+
+# Technology file (see other models in tech/models)
+ElectricalTechModelFilename             = tech/tech_models/Bulk45LVT.model
+
+###############################################################################
+# Timing optimization
+###############################################################################
+
+# True if want to perform timing optimization; otherwise, false.
+IsPerformTimingOptimization             = true
+# Nets that the timing optimizer starts from
+TimingOptimization->StartNetNames       = [*]
+# Operating frequency (Hz)
+Frequency                               = 1.0e9
+
+###############################################################################
+# Model specifications
+###############################################################################
+
+# Number of input ports
+NumberInputPorts                        = 5
+# Number of output ports
+NumberOutputPorts                       = 5
+# Flit width (bit)
+NumberBitsPerFlit                       = 64
+
+# In this example, we define 2 virtual networks (message classes), VN1 and VN2. 
+#                           VN1 VN2
+# Number of VCs              2   3
+# Number of buffers / VC     4   5
+#
+# So in total, there are (2 * 4) + (3 * 5) = 23 flit buffers
+#
+# Number of virtual networks (number of message classes)
+NumberVirtualNetworks                   = 2
+# Number of virtual channels per virtual network
+NumberVirtualChannelsPerVirtualNetwork  = [2, 3]
+# Number of buffers per virtual channel
+NumberBuffersPerVirtualChannel          = [4, 5]
+
+# InputPort 
+# ---------
+# buffer model
+InputPort->BufferModel                  = DFFRAM
+
+# Crossbar
+# --------
+# crossbar model
+CrossbarModel                           = MultiplexerCrossbar
+
+# Switch allocator
+# ----------------
+# arbiter model
+SwitchAllocator->ArbiterModel           = MatrixArbiter
+
+# Clock tree
+# ----------
+# clock tree model
+ClockTreeModel                          = BroadcastHTree
+# number of levels
+ClockTree->NumberLevels                 = 5
+# wire layer
+ClockTree->WireLayer                    = Global
+# wire width multiplier
+ClockTree->WireWidthMultiplier          = 1.0
+