| # Copyright (c) 2013, 2017 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 |
| |
| from __future__ import print_function |
| from __future__ import absolute_import |
| |
| import m5.objects |
| import inspect |
| import sys |
| from textwrap import TextWrapper |
| from . import HMC |
| |
| # 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 list(_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. |
| """ |
| |
| # Mandatory options |
| opt_mem_type = options.mem_type |
| opt_mem_channels = options.mem_channels |
| |
| # Optional options |
| opt_tlm_memory = getattr(options, "tlm_memory", None) |
| opt_external_memory_system = getattr(options, "external_memory_system", |
| None) |
| opt_elastic_trace_en = getattr(options, "elastic_trace_en", False) |
| opt_mem_ranks = getattr(options, "mem_ranks", None) |
| opt_dram_powerdown = getattr(options, "enable_dram_powerdown", None) |
| |
| if opt_mem_type == "HMC_2500_1x32": |
| HMChost = HMC.config_hmc_host_ctrl(options, system) |
| HMC.config_hmc_dev(options, system, HMChost.hmc_host) |
| subsystem = system.hmc_dev |
| xbar = system.hmc_dev.xbar |
| else: |
| subsystem = system |
| xbar = system.membus |
| |
| if opt_tlm_memory: |
| system.external_memory = m5.objects.ExternalSlave( |
| port_type="tlm_slave", |
| port_data=opt_tlm_memory, |
| port=system.membus.master, |
| addr_ranges=system.mem_ranges) |
| system.kernel_addr_check = False |
| return |
| |
| if opt_external_memory_system: |
| subsystem.external_memory = m5.objects.ExternalSlave( |
| port_type=opt_external_memory_system, |
| port_data="init_mem0", port=xbar.master, |
| addr_ranges=system.mem_ranges) |
| subsystem.kernel_addr_check = False |
| return |
| |
| nbr_mem_ctrls = opt_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(opt_mem_type) |
| mem_ctrls = [] |
| |
| if opt_elastic_trace_en and not issubclass(cls, m5.objects.SimpleMemory): |
| fatal("When elastic trace is enabled, configure mem-type as " |
| "simple-mem.") |
| |
| # 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 range(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 opt_mem_ranks: |
| mem_ctrl.ranks_per_channel = opt_mem_ranks |
| |
| # Enable low-power DRAM states if option is set |
| if issubclass(cls, m5.objects.DRAMCtrl): |
| mem_ctrl.enable_dram_powerdown = opt_dram_powerdown |
| |
| if opt_elastic_trace_en: |
| mem_ctrl.latency = '1ns' |
| print("For elastic trace, over-riding Simple Memory " |
| "latency to 1ns.") |
| |
| mem_ctrls.append(mem_ctrl) |
| |
| subsystem.mem_ctrls = mem_ctrls |
| |
| # Connect the controllers to the membus |
| for i in range(len(subsystem.mem_ctrls)): |
| if opt_mem_type == "HMC_2500_1x32": |
| subsystem.mem_ctrls[i].port = xbar[i/4].master |
| # Set memory device size. There is an independent controller for |
| # each vault. All vaults are same size. |
| subsystem.mem_ctrls[i].device_size = options.hmc_dev_vault_size |
| else: |
| subsystem.mem_ctrls[i].port = xbar.master |
