d023b7e8db
This patch adds a progress check to the TrafficGen so that it is easier to detect deadlock scenarios where the generator gets stuck waiting for a retry, and makes no further progress. Change-Id: Ifb8779ad0939f52c0518d0e867bac73f99b82e2b Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Radhika Jagtap <radhika.jagtap@arm.com>
86 lines
4.3 KiB
Python
86 lines
4.3 KiB
Python
# Copyright (c) 2012, 2016 ARM Limited
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# All rights reserved.
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Thomas Grass
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# Andreas Hansson
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# Sascha Bischoff
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from m5.params import *
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from m5.proxy import *
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from MemObject import MemObject
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# The traffic generator is a master module that generates stimuli for
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# the memory system, based on a collection of simple behaviours that
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# are either probabilistic or based on traces. It can be used stand
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# alone for creating test cases for interconnect and memory
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# controllers, or function as a black-box replacement for system
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# components that are not yet modelled in detail, e.g. a video engine
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# or baseband subsystem in an SoC.
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#
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# The traffic generator has a single master port that is used to send
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# requests, independent of the specific behaviour. The behaviour of
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# the traffic generator is specified in a configuration file, and this
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# file describes a state transition graph where each state is a
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# specific generator behaviour. Examples include idling, generating
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# linear address sequences, random sequences and replay of captured
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# traces. By describing these behaviours as states, it is straight
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# forward to create very complex behaviours, simply by arranging them
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# in graphs. The graph transitions can also be annotated with
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# probabilities, effectively making it a Markov Chain.
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class TrafficGen(MemObject):
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type = 'TrafficGen'
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cxx_header = "cpu/testers/traffic_gen/traffic_gen.hh"
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# Port used for sending requests and receiving responses
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port = MasterPort("Master port")
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# Config file to parse for the state descriptions
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config_file = Param.String("Configuration file describing the behaviour")
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# System used to determine the mode of the memory system
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system = Param.System(Parent.any, "System this generator is part of")
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# Should requests respond to back-pressure or not, if true, the
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# rate of the traffic generator will be slowed down if requests
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# are not immediately accepted
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elastic_req = Param.Bool(False,
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"Slow down requests in case of backpressure")
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# Let the user know if we have waited for a retry and not made any
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# progress for a long period of time. The default value is
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# somewhat arbitrary and may well have to be tuned.
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progress_check = Param.Latency('1ms', "Time before exiting " \
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"due to lack of progress")
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