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# Copyright (c) 2012, 2014 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder. You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Copyright (c) 2005 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Ron Dreslinski
# Mitch Hayenga
from ClockedObject import ClockedObject
from m5.SimObject import *
from m5.params import *
from m5.proxy import *
from ReplacementPolicies import *
class HWPProbeEvent(object):
def __init__(self, prefetcher, obj, *listOfNames):
self.obj = obj
self.prefetcher = prefetcher
self.names = listOfNames
def register(self):
if self.obj:
for name in self.names:
self.prefetcher.getCCObject().addEventProbe(
self.obj.getCCObject(), name)
class BasePrefetcher(ClockedObject):
type = 'BasePrefetcher'
abstract = True
cxx_header = "mem/cache/prefetch/base.hh"
cxx_exports = [
PyBindMethod("addEventProbe"),
]
sys = Param.System(Parent.any, "System this prefetcher belongs to")
# Get the block size from the parent (system)
block_size = Param.Int(Parent.cache_line_size, "Block size in bytes")
on_miss = Param.Bool(False, "Only notify prefetcher on misses")
on_read = Param.Bool(True, "Notify prefetcher on reads")
on_write = Param.Bool(True, "Notify prefetcher on writes")
on_data = Param.Bool(True, "Notify prefetcher on data accesses")
on_inst = Param.Bool(True, "Notify prefetcher on instruction accesses")
prefetch_on_access = Param.Bool(Parent.prefetch_on_access,
"Notify the hardware prefetcher on every access (not just misses)")
use_virtual_addresses = Param.Bool(False,
"Use virtual addresses for prefetching")
_events = []
def addEvent(self, newObject):
self._events.append(newObject)
# Override the normal SimObject::regProbeListeners method and
# register deferred event handlers.
def regProbeListeners(self):
for event in self._events:
event.register()
self.getCCObject().regProbeListeners()
def listenFromProbe(self, simObj, *probeNames):
if not isinstance(simObj, SimObject):
raise TypeError("argument must be of SimObject type")
if len(probeNames) <= 0:
raise TypeError("probeNames must have at least one element")
self.addEvent(HWPProbeEvent(self, simObj, *probeNames))
class QueuedPrefetcher(BasePrefetcher):
type = "QueuedPrefetcher"
abstract = True
cxx_class = "QueuedPrefetcher"
cxx_header = "mem/cache/prefetch/queued.hh"
latency = Param.Int(1, "Latency for generated prefetches")
queue_size = Param.Int(32, "Maximum number of queued prefetches")
queue_squash = Param.Bool(True, "Squash queued prefetch on demand access")
queue_filter = Param.Bool(True, "Don't queue redundant prefetches")
cache_snoop = Param.Bool(False, "Snoop cache to eliminate redundant request")
tag_prefetch = Param.Bool(True, "Tag prefetch with PC of generating access")
class StridePrefetcher(QueuedPrefetcher):
type = 'StridePrefetcher'
cxx_class = 'StridePrefetcher'
cxx_header = "mem/cache/prefetch/stride.hh"
# Do not consult stride prefetcher on instruction accesses
on_inst = False
max_conf = Param.Int(7, "Maximum confidence level")
thresh_conf = Param.Int(4, "Threshold confidence level")
min_conf = Param.Int(0, "Minimum confidence level")
start_conf = Param.Int(4, "Starting confidence for new entries")
table_sets = Param.Int(16, "Number of sets in PC lookup table")
table_assoc = Param.Int(4, "Associativity of PC lookup table")
use_master_id = Param.Bool(True, "Use master id based history")
degree = Param.Int(4, "Number of prefetches to generate")
# Get replacement policy
replacement_policy = Param.BaseReplacementPolicy(RandomRP(),
"Replacement policy")
class TaggedPrefetcher(QueuedPrefetcher):
type = 'TaggedPrefetcher'
cxx_class = 'TaggedPrefetcher'
cxx_header = "mem/cache/prefetch/tagged.hh"
degree = Param.Int(2, "Number of prefetches to generate")
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