From 72044e3f5a5b9455e07180806793127be2014451 Mon Sep 17 00:00:00 2001 From: Brad Beckmann Date: Fri, 20 Aug 2010 11:46:13 -0700 Subject: ruby: Disable migratory sharing for token and hammer This patch allows one to disable migratory sharing for those cache blocks that are accessed by atomic requests. While the implementations are different between the token and hammer protocols, the motivation is the same. For Alpha, LLSC semantics expect that normal loads do not unlock cache blocks that have been locked by LL accesses. Therefore, locked blocks should not transfer write permissions when responding to these load requests. Instead, only they only transfer read permissions so that the subsequent SC access can possibly succeed. --- configs/ruby/MOESI_CMP_token.py | 8 ++++++-- configs/ruby/MOESI_hammer.py | 7 +++++-- 2 files changed, 11 insertions(+), 4 deletions(-) (limited to 'configs/ruby') diff --git a/configs/ruby/MOESI_CMP_token.py b/configs/ruby/MOESI_CMP_token.py index 3853ebbb4..ef110d682 100644 --- a/configs/ruby/MOESI_CMP_token.py +++ b/configs/ruby/MOESI_CMP_token.py @@ -51,7 +51,9 @@ def define_options(parser): help="Token_CMP: cycles until issuing again"); parser.add_option("--disable-dyn-timeouts", action="store_true", help="Token_CMP: disable dyanimc timeouts, use fixed latency instead") - + parser.add_option("--allow-atomic-migration", action="store_true", + help="allow migratory sharing for atomic only accessed blocks") + def create_system(options, system, piobus, dma_devices): if buildEnv['PROTOCOL'] != 'MOESI_CMP_token': @@ -111,7 +113,9 @@ def create_system(options, system, piobus, dma_devices): fixed_timeout_latency = \ options.timeout_latency, dynamic_timeout_enabled = \ - not options.disable_dyn_timeouts) + not options.disable_dyn_timeouts, + no_mig_atomic = not \ + options.allow_atomic_migration) exec("system.l1_cntrl%d = l1_cntrl" % i) # diff --git a/configs/ruby/MOESI_hammer.py b/configs/ruby/MOESI_hammer.py index 818600a5a..02d958b09 100644 --- a/configs/ruby/MOESI_hammer.py +++ b/configs/ruby/MOESI_hammer.py @@ -44,7 +44,8 @@ class L2Cache(RubyCache): latency = 10 def define_options(parser): - return + parser.add_option("--allow-atomic-migration", action="store_true", + help="allow migratory sharing for atomic only accessed blocks") def create_system(options, system, piobus, dma_devices): @@ -91,7 +92,9 @@ def create_system(options, system, piobus, dma_devices): sequencer = cpu_seq, L1IcacheMemory = l1i_cache, L1DcacheMemory = l1d_cache, - L2cacheMemory = l2_cache) + L2cacheMemory = l2_cache, + no_mig_atomic = not \ + options.allow_atomic_migration) exec("system.l1_cntrl%d = l1_cntrl" % i) # -- cgit v1.2.3