| # Copyright (c) 2013, 2017, 2020-2021 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 |
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| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| import m5.objects |
| from common import ObjectList |
| from common import HMC |
| |
| def create_mem_intf(intf, r, i, intlv_bits, intlv_size, |
| xor_low_bit): |
| """ |
| 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. |
| if (xor_low_bit): |
| xor_high_bit = xor_low_bit + intlv_bits - 1 |
| else: |
| xor_high_bit = 0 |
| |
| # Create an instance so we can figure out the address |
| # mapping and row-buffer size |
| interface = intf() |
| |
| # Only do this for DRAMs |
| if issubclass(intf, m5.objects.DRAMInterface): |
| # 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 interface.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 = interface.device_rowbuffer_size.value * \ |
| interface.devices_per_rank.value |
| |
| intlv_low_bit = int(math.log(rowbuffer_size, 2)) |
| |
| # Also adjust interleaving bits for NVM attached as memory |
| # Will have separate range defined with unique interleaving |
| if issubclass(intf, m5.objects.NVMInterface): |
| # If the channel bits are appearing after the low order |
| # address bits (buffer bits), we need to add the appropriate |
| # number of bits for the buffer size |
| if interface.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 |
| buffer_size = interface.per_bank_buffer_size.value |
| |
| intlv_low_bit = int(math.log(buffer_size, 2)) |
| |
| # We got all we need to configure the appropriate address |
| # range |
| interface.range = m5.objects.AddrRange(r.start, size = r.size(), |
| intlvHighBit = \ |
| intlv_low_bit + intlv_bits - 1, |
| xorHighBit = xor_high_bit, |
| intlvBits = intlv_bits, |
| intlvMatch = i) |
| return interface |
| |
| 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_channels = options.mem_channels |
| |
| # Semi-optional options |
| # Must have either mem_type or nvm_type or both |
| opt_mem_type = getattr(options, "mem_type", None) |
| opt_nvm_type = getattr(options, "nvm_type", None) |
| if not opt_mem_type and not opt_nvm_type: |
| fatal("Must have option for either mem-type or nvm-type, or both") |
| |
| # 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_nvm_ranks = getattr(options, "nvm_ranks", None) |
| opt_hybrid_channel = getattr(options, "hybrid_channel", False) |
| opt_dram_powerdown = getattr(options, "enable_dram_powerdown", None) |
| opt_mem_channels_intlv = getattr(options, "mem_channels_intlv", 128) |
| opt_xor_low_bit = getattr(options, "xor_low_bit", 0) |
| |
| 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.mem_side_ports, |
| addr_ranges=system.mem_ranges) |
| system.workload.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.workload.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") |
| |
| if opt_mem_type: |
| intf = ObjectList.mem_list.get(opt_mem_type) |
| if opt_nvm_type: |
| n_intf = ObjectList.mem_list.get(opt_nvm_type) |
| |
| nvm_intfs = [] |
| mem_ctrls = [] |
| |
| if opt_elastic_trace_en and not issubclass(intf, 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(opt_mem_channels_intlv, system.cache_line_size.value) |
| |
| # For every range (most systems will only have one), create an |
| # array of memory interfaces and set their parameters to match |
| # their address mapping in the case of a DRAM |
| range_iter = 0 |
| for r in system.mem_ranges: |
| # As the loops iterates across ranges, assign them alternatively |
| # to DRAM and NVM if both configured, starting with DRAM |
| range_iter += 1 |
| |
| for i in range(nbr_mem_ctrls): |
| if opt_mem_type and (not opt_nvm_type or range_iter % 2 != 0): |
| # Create the DRAM interface |
| dram_intf = create_mem_intf(intf, r, i, |
| intlv_bits, intlv_size, opt_xor_low_bit) |
| |
| # Set the number of ranks based on the command-line |
| # options if it was explicitly set |
| if issubclass(intf, m5.objects.DRAMInterface) and \ |
| opt_mem_ranks: |
| dram_intf.ranks_per_channel = opt_mem_ranks |
| |
| # Enable low-power DRAM states if option is set |
| if issubclass(intf, m5.objects.DRAMInterface): |
| dram_intf.enable_dram_powerdown = opt_dram_powerdown |
| |
| if opt_elastic_trace_en: |
| dram_intf.latency = '1ns' |
| print("For elastic trace, over-riding Simple Memory " |
| "latency to 1ns.") |
| |
| # Create the controller that will drive the interface |
| mem_ctrl = dram_intf.controller() |
| |
| mem_ctrls.append(mem_ctrl) |
| |
| elif opt_nvm_type and (not opt_mem_type or range_iter % 2 == 0): |
| nvm_intf = create_mem_intf(n_intf, r, i, |
| intlv_bits, intlv_size, opt_xor_low_bit) |
| |
| # Set the number of ranks based on the command-line |
| # options if it was explicitly set |
| if issubclass(n_intf, m5.objects.NVMInterface) and \ |
| opt_nvm_ranks: |
| nvm_intf.ranks_per_channel = opt_nvm_ranks |
| |
| # Create a controller if not sharing a channel with DRAM |
| # in which case the controller has already been created |
| if not opt_hybrid_channel: |
| mem_ctrl = m5.objects.MemCtrl() |
| mem_ctrl.nvm = nvm_intf |
| |
| mem_ctrls.append(mem_ctrl) |
| else: |
| nvm_intfs.append(nvm_intf) |
| |
| # hook up NVM interface when channel is shared with DRAM + NVM |
| for i in range(len(nvm_intfs)): |
| mem_ctrls[i].nvm = nvm_intfs[i]; |
| |
| # Connect the controller to the xbar port |
| for i in range(len(mem_ctrls)): |
| if opt_mem_type == "HMC_2500_1x32": |
| # Connect the controllers to the membus |
| mem_ctrls[i].port = xbar[i//4].mem_side_ports |
| # Set memory device size. There is an independent controller |
| # for each vault. All vaults are same size. |
| mem_ctrls[i].dram.device_size = options.hmc_dev_vault_size |
| else: |
| # Connect the controllers to the membus |
| mem_ctrls[i].port = xbar.mem_side_ports |
| |
| subsystem.mem_ctrls = mem_ctrls |
