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from m5 import fatal
import m5.objects

def config_etrace(cpu_cls, cpu_list, options):
    if issubclass(cpu_cls, m5.objects.DerivO3CPU):
        # Assign the same file name to all cpus for now. This must be
        # revisited when creating elastic traces for multi processor systems.
        for cpu in cpu_list:
            # Attach the elastic trace probe listener. Set the protobuf trace
            # file names. Set the dependency window size equal to the cpu it
            # is attached to.
            cpu.traceListener = m5.objects.ElasticTrace(
                                instFetchTraceFile = options.inst_trace_file,
                                dataDepTraceFile = options.data_trace_file,
                                depWindowSize = 3 * cpu.numROBEntries)
            # Make the number of entries in the ROB, LQ and SQ very
            # large so that there are no stalls due to resource
            # limitation as such stalls will get captured in the trace
            # as compute delay. For replay, ROB, LQ and SQ sizes are
            # modelled in the Trace CPU.
            cpu.numROBEntries = 512;
            cpu.LQEntries = 128;
            cpu.SQEntries = 128;
    else:
        fatal("%s does not support data dependency tracing. Use a CPU model of"
              " type or inherited from DerivO3CPU.", cpu_cls)
