config: Add flag options to set the hardware prefetchers to use

This patch adds three flag options to set the prefetcher class of the
L1i cache, L1d cache and L2 cache.

Change-Id: I310fcd9c49f9554d98cd565a32bdb96a3e165486
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17709
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/configs/common/CacheConfig.py b/configs/common/CacheConfig.py
index 946060768..f705ab09a 100644
--- a/configs/common/CacheConfig.py
+++ b/configs/common/CacheConfig.py
@@ -47,6 +47,7 @@ from __future__ import absolute_import
 import m5
 from m5.objects import *
 from .Caches import *
+from . import HWPConfig
 
 def config_cache(options, system):
     if options.external_memory_system and (options.caches or options.l2cache):
@@ -104,6 +105,14 @@ def config_cache(options, system):
         system.tol2bus = L2XBar(clk_domain = system.cpu_clk_domain)
         system.l2.cpu_side = system.tol2bus.master
         system.l2.mem_side = system.membus.slave
+        if options.l2_hwp_type:
+            hwpClass = HWPConfig.get(options.l2_hwp_type)
+            if system.l2.prefetcher != "Null":
+                print("Warning: l2-hwp-type is set (", hwpClass, "), but",
+                      "the current l2 has a default Hardware Prefetcher",
+                      "of type", type(system.l2.prefetcher), ", using the",
+                      "specified by the flag option.")
+            system.l2.prefetcher = hwpClass()
 
     if options.memchecker:
         system.memchecker = MemChecker()
@@ -139,6 +148,24 @@ def config_cache(options, system):
                 # Let CPU connect to monitors
                 dcache = dcache_mon
 
+            if options.l1d_hwp_type:
+                hwpClass = HWPConfig.get(options.l1d_hwp_type)
+                if dcache.prefetcher != m5.params.NULL:
+                    print("Warning: l1d-hwp-type is set (", hwpClass, "), but",
+                          "the current l1d has a default Hardware Prefetcher",
+                          "of type", type(dcache.prefetcher), ", using the",
+                          "specified by the flag option.")
+                dcache.prefetcher = hwpClass()
+
+            if options.l1i_hwp_type:
+                hwpClass = HWPConfig.get(options.l1i_hwp_type)
+                if icache.prefetcher != m5.params.NULL:
+                    print("Warning: l1i-hwp-type is set (", hwpClass, "), but",
+                          "the current l1i has a default Hardware Prefetcher",
+                          "of type", type(icache.prefetcher), ", using the",
+                          "specified by the flag option.")
+                icache.prefetcher = hwpClass()
+
             # When connecting the caches, the clock is also inherited
             # from the CPU in question
             system.cpu[i].addPrivateSplitL1Caches(icache, dcache,