71a02f624e
Disable the default snoop filter in the SystemXBar so that the typical membus does not have a snoop filter by default. Instead, add the snoop filter only when there are caches added to the system (with the caches / l2cache options). The underlying problem is that the snoop filter grows without bounds (for now) if there are no caches to tell it that lines have been evicted. This causes slow regression runs for all the atomic regressions. This patch fixes this behaviour. --HG-- extra : source : f97c20511828209757440839ed48d741d02d428f
182 lines
7.9 KiB
Python
182 lines
7.9 KiB
Python
# Copyright (c) 2012-2013, 2015 ARM Limited
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# All rights reserved
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Copyright (c) 2010 Advanced Micro Devices, Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Lisa Hsu
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# Configure the M5 cache hierarchy config in one place
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#
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import m5
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from m5.objects import *
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from Caches import *
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def config_cache(options, system):
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if options.external_memory_system and (options.caches or options.l2cache):
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print "External caches and internal caches are exclusive options.\n"
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sys.exit(1)
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if options.external_memory_system:
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ExternalCache = ExternalCacheFactory(options.external_memory_system)
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if options.cpu_type == "arm_detailed":
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try:
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from O3_ARM_v7a import *
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except:
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print "arm_detailed is unavailable. Did you compile the O3 model?"
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sys.exit(1)
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dcache_class, icache_class, l2_cache_class = \
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O3_ARM_v7a_DCache, O3_ARM_v7a_ICache, O3_ARM_v7aL2
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else:
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dcache_class, icache_class, l2_cache_class = \
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L1_DCache, L1_ICache, L2Cache
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# Set the cache line size of the system
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system.cache_line_size = options.cacheline_size
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# If elastic trace generation is enabled, make sure the memory system is
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# minimal so that compute delays do not include memory access latencies.
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# Configure the compulsory L1 caches for the O3CPU, do not configure
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# any more caches.
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if options.l2cache and options.elastic_trace_en:
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fatal("When elastic trace is enabled, do not configure L2 caches.")
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if options.l2cache:
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# Provide a clock for the L2 and the L1-to-L2 bus here as they
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# are not connected using addTwoLevelCacheHierarchy. Use the
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# same clock as the CPUs.
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system.l2 = l2_cache_class(clk_domain=system.cpu_clk_domain,
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size=options.l2_size,
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assoc=options.l2_assoc)
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system.tol2bus = L2XBar(clk_domain = system.cpu_clk_domain)
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system.l2.cpu_side = system.tol2bus.master
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system.l2.mem_side = system.membus.slave
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if options.memchecker:
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system.memchecker = MemChecker()
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for i in xrange(options.num_cpus):
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if options.caches:
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icache = icache_class(size=options.l1i_size,
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assoc=options.l1i_assoc)
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dcache = dcache_class(size=options.l1d_size,
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assoc=options.l1d_assoc)
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if options.memchecker:
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dcache_mon = MemCheckerMonitor(warn_only=True)
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dcache_real = dcache
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# Do not pass the memchecker into the constructor of
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# MemCheckerMonitor, as it would create a copy; we require
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# exactly one MemChecker instance.
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dcache_mon.memchecker = system.memchecker
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# Connect monitor
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dcache_mon.mem_side = dcache.cpu_side
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# Let CPU connect to monitors
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dcache = dcache_mon
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# When connecting the caches, the clock is also inherited
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# from the CPU in question
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if buildEnv['TARGET_ISA'] == 'x86':
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system.cpu[i].addPrivateSplitL1Caches(icache, dcache,
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PageTableWalkerCache(),
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PageTableWalkerCache())
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else:
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system.cpu[i].addPrivateSplitL1Caches(icache, dcache)
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if options.memchecker:
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# The mem_side ports of the caches haven't been connected yet.
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# Make sure connectAllPorts connects the right objects.
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system.cpu[i].dcache = dcache_real
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system.cpu[i].dcache_mon = dcache_mon
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elif options.external_memory_system:
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# These port names are presented to whatever 'external' system
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# gem5 is connecting to. Its configuration will likely depend
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# on these names. For simplicity, we would advise configuring
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# it to use this naming scheme; if this isn't possible, change
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# the names below.
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if buildEnv['TARGET_ISA'] in ['x86', 'arm']:
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system.cpu[i].addPrivateSplitL1Caches(
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ExternalCache("cpu%d.icache" % i),
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ExternalCache("cpu%d.dcache" % i),
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ExternalCache("cpu%d.itb_walker_cache" % i),
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ExternalCache("cpu%d.dtb_walker_cache" % i))
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else:
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system.cpu[i].addPrivateSplitL1Caches(
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ExternalCache("cpu%d.icache" % i),
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ExternalCache("cpu%d.dcache" % i))
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system.cpu[i].createInterruptController()
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if options.l2cache:
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system.cpu[i].connectAllPorts(system.tol2bus, system.membus)
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elif options.external_memory_system:
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system.cpu[i].connectUncachedPorts(system.membus)
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else:
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system.cpu[i].connectAllPorts(system.membus)
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# Add a snoop filter to the membus if there are caches above it
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if (options.l2cache or options.caches) and \
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(system.membus.snoop_filter == NULL):
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system.membus.snoop_filter = SnoopFilter()
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return system
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# ExternalSlave provides a "port", but when that port connects to a cache,
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# the connecting CPU SimObject wants to refer to its "cpu_side".
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# The 'ExternalCache' class provides this adaptation by rewriting the name,
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# eliminating distracting changes elsewhere in the config code.
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class ExternalCache(ExternalSlave):
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def __getattr__(cls, attr):
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if (attr == "cpu_side"):
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attr = "port"
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return super(ExternalSlave, cls).__getattr__(attr)
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def __setattr__(cls, attr, value):
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if (attr == "cpu_side"):
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attr = "port"
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return super(ExternalSlave, cls).__setattr__(attr, value)
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def ExternalCacheFactory(port_type):
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def make(name):
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return ExternalCache(port_data=name, port_type=port_type,
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addr_ranges=[AllMemory])
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return make
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