configs: changed CHI --noc-config format

Changed format from yaml to plain python. The new py configuration
file, when provided, must specialize the CHI node types defined in
configs/ruby/CHI_config.py (moved from configs/ruby/CHI.py). This
is required in order to setup the node->router bindings when the
CustomMesh topology is used.

See configs/example/noc_config/2x4.py (replaces
configs/example/noc_config/2x4.yaml) for an example.

--noc-config was also renamed to --chi-config, since the CHI node types
can be fully specialized in the configuration file.

Change-Id: Ic0c5407dba3d2483d5c30634c115b5410a5228fd
Signed-off-by: Tiago Mück <tiago.muck@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/43123
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/example/noc_config/2x4.py

@@ -0,0 +1,77 @@
+# Copyright (c) 2021 ARM Limited
+# All rights reserved.
+#
+# The license below extends only to copyright in the software and shall
+# not be construed as granting a license to any other intellectual
+# property including but not limited to intellectual property relating
+# to a hardware implementation of the functionality of the software
+# licensed hereunder.  You may use the software subject to the license
+# terms below provided that you ensure that this notice is replicated
+# unmodified and in its entirety in all distributions of the software,
+# modified or unmodified, in source code or in binary form.
+#
+# 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.
+
+from ruby import CHI_config
+
+# CustomMesh parameters for a 2x4 mesh. Routers will have the following layout:
+#
+# 0 --- 1 --- 2 --- 3
+# |     |     |     |
+# 4 --- 5 --- 6 --- 7
+#
+# Default parameter are configs/ruby/CHI_config.py
+#
+class NoC_Params(CHI_config.NoC_Params):
+    num_rows = 2
+    num_cols = 4
+
+# Specialization of nodes to define bindings for each CHI node type
+# needed by CustomMesh.
+# The default types are defined in CHI_Node and their derivatives in
+# configs/ruby/CHI_config.py
+
+class CHI_RNF(CHI_config.CHI_RNF):
+    class NoC_Params(CHI_config.CHI_RNF.NoC_Params):
+        router_list = [1, 2, 5, 6]
+
+class CHI_HNF(CHI_config.CHI_HNF):
+    class NoC_Params(CHI_config.CHI_HNF.NoC_Params):
+        router_list = [1, 2, 5, 6]
+
+class CHI_SNF_MainMem(CHI_config.CHI_SNF_MainMem):
+    class NoC_Params(CHI_config.CHI_SNF_MainMem.NoC_Params):
+        router_list = [0, 4]
+
+class CHI_SNF_BootMem(CHI_config.CHI_SNF_BootMem):
+    class NoC_Params(CHI_config.CHI_SNF_BootMem.NoC_Params):
+        router_list = [3]
+
+class CHI_RNI_DMA(CHI_config.CHI_RNI_DMA):
+    class NoC_Params(CHI_config.CHI_RNI_DMA.NoC_Params):
+        router_list = [7]
+
+class CHI_RNI_IO(CHI_config.CHI_RNI_IO):
+    class NoC_Params(CHI_config.CHI_RNI_IO.NoC_Params):
+        router_list = [7]