xref: /gem5/configs/common/CacheConfig.py

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# Authors: Lisa Hsu

# Configure the M5 cache hierarchy config in one place
#

import m5
from m5.objects import *
from Caches import *

def config_cache(options, system):
    if options.external_memory_system and (options.caches or options.l2cache):
        print "External caches and internal caches are exclusive options.\n"
        sys.exit(1)

    if options.external_memory_system:
        ExternalCache = ExternalCacheFactory(options.external_memory_system)

    if options.cpu_type == "arm_detailed":
        try:
            from O3_ARM_v7a import *
        except:
            print "arm_detailed is unavailable. Did you compile the O3 model?"
            sys.exit(1)

        dcache_class, icache_class, l2_cache_class, walk_cache_class = \
            O3_ARM_v7a_DCache, O3_ARM_v7a_ICache, O3_ARM_v7aL2, \
            O3_ARM_v7aWalkCache
    else:
        dcache_class, icache_class, l2_cache_class, walk_cache_class = \
            L1_DCache, L1_ICache, L2Cache, None

        if buildEnv['TARGET_ISA'] == 'x86':
            walk_cache_class = PageTableWalkerCache

    # Set the cache line size of the system
    system.cache_line_size = options.cacheline_size

    # If elastic trace generation is enabled, make sure the memory system is
    # minimal so that compute delays do not include memory access latencies.
    # Configure the compulsory L1 caches for the O3CPU, do not configure
    # any more caches.
    if options.l2cache and options.elastic_trace_en:
        fatal("When elastic trace is enabled, do not configure L2 caches.")

    if options.l2cache:
        # Provide a clock for the L2 and the L1-to-L2 bus here as they
        # are not connected using addTwoLevelCacheHierarchy. Use the
        # same clock as the CPUs.
        system.l2 = l2_cache_class(clk_domain=system.cpu_clk_domain,
                                   size=options.l2_size,
                                   assoc=options.l2_assoc)

        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.memchecker:
        system.memchecker = MemChecker()

    for i in xrange(options.num_cpus):
        if options.caches:
            icache = icache_class(size=options.l1i_size,
                                  assoc=options.l1i_assoc)
            dcache = dcache_class(size=options.l1d_size,
                                  assoc=options.l1d_assoc)

            # If we have a walker cache specified, instantiate two
            # instances here
            if walk_cache_class:
                iwalkcache = walk_cache_class()
                dwalkcache = walk_cache_class()
            else:
                iwalkcache = None
                dwalkcache = None

            if options.memchecker:
                dcache_mon = MemCheckerMonitor(warn_only=True)
                dcache_real = dcache

                # Do not pass the memchecker into the constructor of
                # MemCheckerMonitor, as it would create a copy; we require
                # exactly one MemChecker instance.
                dcache_mon.memchecker = system.memchecker

                # Connect monitor
                dcache_mon.mem_side = dcache.cpu_side

                # Let CPU connect to monitors
                dcache = dcache_mon

            # When connecting the caches, the clock is also inherited
            # from the CPU in question
            system.cpu[i].addPrivateSplitL1Caches(icache, dcache,
                                                  iwalkcache, dwalkcache)

            if options.memchecker:
                # The mem_side ports of the caches haven't been connected yet.
                # Make sure connectAllPorts connects the right objects.
                system.cpu[i].dcache = dcache_real
                system.cpu[i].dcache_mon = dcache_mon

        elif options.external_memory_system:
            # These port names are presented to whatever 'external' system
            # gem5 is connecting to.  Its configuration will likely depend
            # on these names.  For simplicity, we would advise configuring
            # it to use this naming scheme; if this isn't possible, change
            # the names below.
            if buildEnv['TARGET_ISA'] in ['x86', 'arm']:
                system.cpu[i].addPrivateSplitL1Caches(
                        ExternalCache("cpu%d.icache" % i),
                        ExternalCache("cpu%d.dcache" % i),
                        ExternalCache("cpu%d.itb_walker_cache" % i),
                        ExternalCache("cpu%d.dtb_walker_cache" % i))
            else:
                system.cpu[i].addPrivateSplitL1Caches(
                        ExternalCache("cpu%d.icache" % i),
                        ExternalCache("cpu%d.dcache" % i))

        system.cpu[i].createInterruptController()
        if options.l2cache:
            system.cpu[i].connectAllPorts(system.tol2bus, system.membus)
        elif options.external_memory_system:
            system.cpu[i].connectUncachedPorts(system.membus)
        else:
            system.cpu[i].connectAllPorts(system.membus)

        # Add a snoop filter to the membus if there are caches above it
        if (options.l2cache or options.caches) and \
        (system.membus.snoop_filter == NULL):
            system.membus.snoop_filter = SnoopFilter()

    return system

# ExternalSlave provides a "port", but when that port connects to a cache,
# the connecting CPU SimObject wants to refer to its "cpu_side".
# The 'ExternalCache' class provides this adaptation by rewriting the name,
# eliminating distracting changes elsewhere in the config code.
class ExternalCache(ExternalSlave):
    def __getattr__(cls, attr):
        if (attr == "cpu_side"):
            attr = "port"
        return super(ExternalSlave, cls).__getattr__(attr)

    def __setattr__(cls, attr, value):
        if (attr == "cpu_side"):
            attr = "port"
        return super(ExternalSlave, cls).__setattr__(attr, value)

def ExternalCacheFactory(port_type):
    def make(name):
        return ExternalCache(port_data=name, port_type=port_type,
                             addr_ranges=[AllMemory])
    return make