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# Copyright (c) 2013 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.
#
# 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: Andreas Sandberg
# Andreas Hansson
import m5.objects
import inspect
import sys
import HMC
from textwrap import TextWrapper
# Dictionary of mapping names of real memory controller models to
# classes.
_mem_classes = {}
def is_mem_class(cls):
"""Determine if a class is a memory controller that can be instantiated"""
# We can't use the normal inspect.isclass because the ParamFactory
# and ProxyFactory classes have a tendency to confuse it.
try:
return issubclass(cls, m5.objects.AbstractMemory) and \
not cls.abstract
except TypeError:
return False
def get(name):
"""Get a memory class from a user provided class name."""
try:
mem_class = _mem_classes[name]
return mem_class
except KeyError:
print "%s is not a valid memory controller." % (name,)
sys.exit(1)
def print_mem_list():
"""Print a list of available memory classes."""
print "Available memory classes:"
doc_wrapper = TextWrapper(initial_indent="\t\t", subsequent_indent="\t\t")
for name, cls in _mem_classes.items():
print "\t%s" % name
# Try to extract the class documentation from the class help
# string.
doc = inspect.getdoc(cls)
if doc:
for line in doc_wrapper.wrap(doc):
print line
def mem_names():
"""Return a list of valid memory names."""
return _mem_classes.keys()
# Add all memory controllers in the object hierarchy.
for name, cls in inspect.getmembers(m5.objects, is_mem_class):
_mem_classes[name] = cls
def create_mem_ctrl(cls, r, i, nbr_mem_ctrls, intlv_bits, intlv_size):
"""
Helper function for creating a single memoy controller from the given
options. This function is invoked multiple times in config_mem function
to create an array of controllers.
"""
import math
intlv_low_bit = int(math.log(intlv_size, 2))
# Use basic hashing for the channel selection, and preferably use
# the lower tag bits from the last level cache. As we do not know
# the details of the caches here, make an educated guess. 4 MByte
# 4-way associative with 64 byte cache lines is 6 offset bits and
# 14 index bits.
xor_low_bit = 20
# Create an instance so we can figure out the address
# mapping and row-buffer size
ctrl = cls()
# Only do this for DRAMs
if issubclass(cls, m5.objects.DRAMCtrl):
# Inform each controller how many channels to account
# for
ctrl.channels = nbr_mem_ctrls
# If the channel bits are appearing after the column
# bits, we need to add the appropriate number of bits
# for the row buffer size
if ctrl.addr_mapping.value == 'RoRaBaChCo':
# This computation only really needs to happen
# once, but as we rely on having an instance we
# end up having to repeat it for each and every
# one
rowbuffer_size = ctrl.device_rowbuffer_size.value * \
ctrl.devices_per_rank.value
intlv_low_bit = int(math.log(rowbuffer_size, 2))
# We got all we need to configure the appropriate address
# range
ctrl.range = m5.objects.AddrRange(r.start, size = r.size(),
intlvHighBit = \
intlv_low_bit + intlv_bits - 1,
xorHighBit = \
xor_low_bit + intlv_bits - 1,
intlvBits = intlv_bits,
intlvMatch = i)
return ctrl
def config_mem(options, system):
"""
Create the memory controllers based on the options and attach them.
If requested, we make a multi-channel configuration of the
selected memory controller class by creating multiple instances of
the specific class. The individual controllers have their
parameters set such that the address range is interleaved between
them.
"""
if ( options.mem_type == "HMC_2500_x32"):
HMC.config_hmc(options, system)
subsystem = system.hmc
xbar = system.hmc.xbar
else:
subsystem = system
xbar = system.membus
if options.tlm_memory:
system.external_memory = m5.objects.ExternalSlave(
port_type="tlm",
port_data=options.tlm_memory,
port=system.membus.master,
addr_ranges=system.mem_ranges)
system.kernel_addr_check = False
return
if options.external_memory_system:
subsystem.external_memory = m5.objects.ExternalSlave(
port_type=options.external_memory_system,
port_data="init_mem0", port=xbar.master,
addr_ranges=system.mem_ranges)
subsystem.kernel_addr_check = False
return
nbr_mem_ctrls = options.mem_channels
import math
from m5.util import fatal
intlv_bits = int(math.log(nbr_mem_ctrls, 2))
if 2 ** intlv_bits != nbr_mem_ctrls:
fatal("Number of memory channels must be a power of 2")
cls = get(options.mem_type)
mem_ctrls = []
# The default behaviour is to interleave memory channels on 128
# byte granularity, or cache line granularity if larger than 128
# byte. This value is based on the locality seen across a large
# range of workloads.
intlv_size = max(128, system.cache_line_size.value)
# For every range (most systems will only have one), create an
# array of controllers and set their parameters to match their
# address mapping in the case of a DRAM
for r in system.mem_ranges:
for i in xrange(nbr_mem_ctrls):
mem_ctrl = create_mem_ctrl(cls, r, i, nbr_mem_ctrls, intlv_bits,
intlv_size)
# Set the number of ranks based on the command-line
# options if it was explicitly set
if issubclass(cls, m5.objects.DRAMCtrl) and \
options.mem_ranks:
mem_ctrl.ranks_per_channel = options.mem_ranks
mem_ctrls.append(mem_ctrl)
subsystem.mem_ctrls = mem_ctrls
# Connect the controllers to the membus
for i in xrange(len(subsystem.mem_ctrls)):
subsystem.mem_ctrls[i].port = xbar.master
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