configs: Instantiate RNFs and MN via callbacks

This commit allows top level configs making use of the Ruby module
to define node generation callbacks.
The config_ruby function will check the system object for two
factory methods

1) _rnf_gen, if defined, will be called to generate RNFs
2) _mn_gen, if defined, will be called to generate MNs

Change-Id: I9daeece646e7cdb2d3bfefa761a9650562f8eb4b
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>

configs/ruby/CHI.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 ARM Limited
+# Copyright (c) 2021, 2024 Arm Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -102,32 +102,6 @@ def create_system(
     CHI_RNI_DMA = chi_defs.CHI_RNI_DMA
     CHI_RNI_IO = chi_defs.CHI_RNI_IO
 
-    # Declare caches and controller types used by the protocol
-    # Notice tag and data accesses are not concurrent, so the a cache hit
-    # latency = tag + data + response latencies.
-    # Default response latencies are 1 cy for all controllers.
-    # For L1 controllers the mandatoryQueue enqueue latency is always 1 cy and
-    # this is deducted from the initial tag read latency for sequencer requests
-    # dataAccessLatency may be set to 0 if one wants to consider parallel
-    # data and tag lookups
-    class L1ICache(RubyCache):
-        dataAccessLatency = 1
-        tagAccessLatency = 1
-        size = options.l1i_size
-        assoc = options.l1i_assoc
-
-    class L1DCache(RubyCache):
-        dataAccessLatency = 2
-        tagAccessLatency = 1
-        size = options.l1d_size
-        assoc = options.l1d_assoc
-
-    class L2Cache(RubyCache):
-        dataAccessLatency = 6
-        tagAccessLatency = 2
-        size = options.l2_size
-        assoc = options.l2_assoc
-
     class HNFCache(RubyCache):
         dataAccessLatency = 10
         tagAccessLatency = 2
@@ -147,25 +121,23 @@ def create_system(
 
     # Creates on RNF per cpu with priv l2 caches
     assert len(cpus) == options.num_cpus
-    ruby_system.rnf = [
+
-        CHI_RNF(
+    rnf_cb = getattr(system, "_rnf_gen", CHI_RNF.generate)
-            [cpu],
+
-            ruby_system,
+    # Generate the Request Nodes
-            L1ICache,
+    ruby_system.rnf = rnf_cb(options, ruby_system, cpus)
-            L1DCache,
+
-            system.cache_line_size.value,
-        )
-        for cpu in cpus
-    ]
     for rnf in ruby_system.rnf:
-        rnf.addPrivL2Cache(L2Cache)
         cpu_sequencers.extend(rnf.getSequencers())
         all_cntrls.extend(rnf.getAllControllers())
         network_nodes.append(rnf)
         network_cntrls.extend(rnf.getNetworkSideControllers())
 
-    # Creates one Misc Node
+    mn_cb = getattr(system, "_mn_gen", CHI_MN.generate)
-    ruby_system.mn = [CHI_MN(ruby_system, [cpu.l1d for cpu in cpus])]
+
+    # Generate the Misc Nodes
+    ruby_system.mn = mn_cb(options, ruby_system, cpus)
+
     for mn in ruby_system.mn:
         all_cntrls.extend(mn.getAllControllers())
         network_nodes.append(mn)

configs/ruby/CHI_config.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2021-2023 ARM Limited
+# Copyright (c) 2021-2024 Arm Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -51,6 +51,29 @@ import m5
 from m5.objects import *
 
 
+# Declare caches and controller types used by the protocol
+# Notice tag and data accesses are not concurrent, so the a cache hit
+# latency = tag + data + response latencies.
+# Default response latencies are 1 cy for all controllers.
+# For L1 controllers the mandatoryQueue enqueue latency is always 1 cy and
+# this is deducted from the initial tag read latency for sequencer requests
+# dataAccessLatency may be set to 0 if one wants to consider parallel
+# data and tag lookups
+class L1ICache(RubyCache):
+    dataAccessLatency = 1
+    tagAccessLatency = 1
+
+
+class L1DCache(RubyCache):
+    dataAccessLatency = 2
+    tagAccessLatency = 1
+
+
+class L2Cache(RubyCache):
+    dataAccessLatency = 6
+    tagAccessLatency = 2
+
+
 class Versions:
     """
     Helper class to obtain unique ids for a given controller class.
@@ -575,6 +598,24 @@ class CHI_RNF(CHI_Node):
                 c.downstream_destinations = [cpu.l2]
             cpu._ll_cntrls = [cpu.l2]
 
+    @classmethod
+    def generate(cls, options, ruby_system, cpus):
+        rnfs = [
+            CHI_RNF(
+                [cpu],
+                ruby_system,
+                L1ICache(size=options.l1i_size, assoc=options.l1i_assoc),
+                L1DCache(size=options.l1d_size, assoc=options.l1d_assoc),
+                options.cacheline_size,
+            )
+            for cpu in cpus
+        ]
+        for rnf in rnfs:
+            rnf.addPrivL2Cache(
+                L2Cache(size=options.l2_size, assoc=options.l2_assoc)
+            )
+        return rnfs
+
 
 class CHI_HNF(CHI_Node):
     """
@@ -678,6 +719,13 @@ class CHI_MN(CHI_Node):
     def getNetworkSideControllers(self):
         return [self._cntrl]
 
+    @classmethod
+    def generate(cls, options, ruby_system, cpus):
+        """
+        Creates one Misc Node
+        """
+        return [CHI_MN(ruby_system, [cpu.l1d for cpu in cpus])]
+
 
 class CHI_SNF_Base(CHI_Node):
     """